Update maintainer section of the man pages
[lttng-tools.git] / src / bin / lttng-sessiond / main.c
CommitLineData
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1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
0fdd1e2c 3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
26296c48 4 * 2013 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
fac6795d 5 *
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6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License, version 2 only,
8 * as published by the Free Software Foundation.
91d76f53 9 *
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10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
91d76f53 14 *
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15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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18 */
19
20#define _GNU_SOURCE
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21#include <getopt.h>
22#include <grp.h>
23#include <limits.h>
0bb7724a 24#include <paths.h>
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25#include <pthread.h>
26#include <signal.h>
27#include <stdio.h>
28#include <stdlib.h>
29#include <string.h>
331744e3 30#include <inttypes.h>
0fdd1e2c 31#include <sys/mman.h>
b73401da 32#include <sys/mount.h>
1e307fab 33#include <sys/resource.h>
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34#include <sys/socket.h>
35#include <sys/stat.h>
36#include <sys/types.h>
0fdd1e2c 37#include <sys/wait.h>
5c827ce0 38#include <urcu/uatomic.h>
fac6795d 39#include <unistd.h>
3bd1e081 40#include <config.h>
fac6795d 41
990570ed 42#include <common/common.h>
d27c42b8 43#include <common/compat/socket.h>
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44#include <common/defaults.h>
45#include <common/kernel-consumer/kernel-consumer.h>
50c8f484 46#include <common/futex.h>
00e2e675 47#include <common/relayd/relayd.h>
81b86775 48#include <common/utils.h>
3ccdf997 49#include <common/daemonize.h>
26296c48 50#include <common/config/config.h>
fac6795d 51
10a8a223 52#include "lttng-sessiond.h"
7972aab2 53#include "buffer-registry.h"
54d01ffb 54#include "channel.h"
2f77fc4b 55#include "cmd.h"
00e2e675 56#include "consumer.h"
099e26bd 57#include "context.h"
54d01ffb 58#include "event.h"
4771f025 59#include "kernel.h"
f1e16794 60#include "kernel-consumer.h"
096102bd 61#include "modprobe.h"
0fdd1e2c 62#include "shm.h"
1e307fab 63#include "ust-ctl.h"
00e2e675 64#include "ust-consumer.h"
8e68d1c8 65#include "utils.h"
4063050c 66#include "fd-limit.h"
8782cc74 67#include "health-sessiond.h"
8ac94142 68#include "testpoint.h"
d0b96690 69#include "ust-thread.h"
022d91ba 70#include "agent-thread.h"
fb198a11 71#include "save.h"
ef367a93 72#include "load-session-thread.h"
834978fd 73#include "syscall.h"
fac6795d 74
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75#define CONSUMERD_FILE "lttng-consumerd"
76
fac6795d 77const char *progname;
6c71277b 78static const char *tracing_group_name = DEFAULT_TRACING_GROUP;
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79static int tracing_group_name_override;
80static char *opt_pidfile;
5b8719f5 81static int opt_sig_parent;
97e19046 82static int opt_verbose_consumer;
72dd7491 83static int opt_daemon, opt_background;
4fba7219 84static int opt_no_kernel;
ef367a93 85static char *opt_load_session_path;
1d4b027a 86static pid_t ppid; /* Parent PID for --sig-parent option */
0bb7724a 87static pid_t child_ppid; /* Internal parent PID use with daemonize. */
67e40797 88static char *rundir;
c9cb3e7d 89static int lockfile_fd = -1;
3bd1e081 90
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91/* Set to 1 when a SIGUSR1 signal is received. */
92static int recv_child_signal;
93
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94/*
95 * Consumer daemon specific control data. Every value not initialized here is
96 * set to 0 by the static definition.
97 */
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98static struct consumer_data kconsumer_data = {
99 .type = LTTNG_CONSUMER_KERNEL,
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100 .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
101 .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH,
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102 .err_sock = -1,
103 .cmd_sock = -1,
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104 .pid_mutex = PTHREAD_MUTEX_INITIALIZER,
105 .lock = PTHREAD_MUTEX_INITIALIZER,
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106 .cond = PTHREAD_COND_INITIALIZER,
107 .cond_mutex = PTHREAD_MUTEX_INITIALIZER,
3bd1e081 108};
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109static struct consumer_data ustconsumer64_data = {
110 .type = LTTNG_CONSUMER64_UST,
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111 .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH,
112 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH,
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113 .err_sock = -1,
114 .cmd_sock = -1,
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115 .pid_mutex = PTHREAD_MUTEX_INITIALIZER,
116 .lock = PTHREAD_MUTEX_INITIALIZER,
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117 .cond = PTHREAD_COND_INITIALIZER,
118 .cond_mutex = PTHREAD_MUTEX_INITIALIZER,
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119};
120static struct consumer_data ustconsumer32_data = {
121 .type = LTTNG_CONSUMER32_UST,
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122 .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH,
123 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH,
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124 .err_sock = -1,
125 .cmd_sock = -1,
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126 .pid_mutex = PTHREAD_MUTEX_INITIALIZER,
127 .lock = PTHREAD_MUTEX_INITIALIZER,
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128 .cond = PTHREAD_COND_INITIALIZER,
129 .cond_mutex = PTHREAD_MUTEX_INITIALIZER,
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130};
131
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132/* Command line options */
133static const struct option long_options[] = {
134 { "client-sock", 1, 0, 'c' },
135 { "apps-sock", 1, 0, 'a' },
136 { "kconsumerd-cmd-sock", 1, 0, 'C' },
137 { "kconsumerd-err-sock", 1, 0, 'E' },
138 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
139 { "ustconsumerd32-err-sock", 1, 0, 'H' },
140 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
141 { "ustconsumerd64-err-sock", 1, 0, 'F' },
142 { "consumerd32-path", 1, 0, 'u' },
143 { "consumerd32-libdir", 1, 0, 'U' },
144 { "consumerd64-path", 1, 0, 't' },
145 { "consumerd64-libdir", 1, 0, 'T' },
146 { "daemonize", 0, 0, 'd' },
72dd7491 147 { "background", 0, 0, 'b' },
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148 { "sig-parent", 0, 0, 'S' },
149 { "help", 0, 0, 'h' },
150 { "group", 1, 0, 'g' },
151 { "version", 0, 0, 'V' },
152 { "quiet", 0, 0, 'q' },
153 { "verbose", 0, 0, 'v' },
154 { "verbose-consumer", 0, 0, 'Z' },
155 { "no-kernel", 0, 0, 'N' },
156 { "pidfile", 1, 0, 'p' },
1b2ef7fe 157 { "agent-tcp-port", 1, 0, 'J' },
26296c48 158 { "config", 1, 0, 'f' },
ef367a93 159 { "load", 1, 0, 'l' },
fbb9748b 160 { "kmod-probes", 1, 0, 'P' },
c9d42407 161 { "extra-kmod-probes", 1, 0, 'e' },
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162 { NULL, 0, 0, 0 }
163};
164
165/* Command line options to ignore from configuration file */
166static const char *config_ignore_options[] = { "help", "version", "config" };
167
26c9d55e 168/* Shared between threads */
099e26bd 169static int dispatch_thread_exit;
fac6795d 170
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171/* Global application Unix socket path */
172static char apps_unix_sock_path[PATH_MAX];
173/* Global client Unix socket path */
174static char client_unix_sock_path[PATH_MAX];
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175/* global wait shm path for UST */
176static char wait_shm_path[PATH_MAX];
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177/* Global health check unix path */
178static char health_unix_sock_path[PATH_MAX];
fac6795d 179
1d4b027a 180/* Sockets and FDs */
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181static int client_sock = -1;
182static int apps_sock = -1;
2f77fc4b 183int kernel_tracer_fd = -1;
76d7553f 184static int kernel_poll_pipe[2] = { -1, -1 };
1d4b027a 185
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186/*
187 * Quit pipe for all threads. This permits a single cancellation point
188 * for all threads when receiving an event on the pipe.
189 */
76d7553f 190static int thread_quit_pipe[2] = { -1, -1 };
273ea72c 191
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192/*
193 * This pipe is used to inform the thread managing application communication
194 * that a command is queued and ready to be processed.
195 */
76d7553f 196static int apps_cmd_pipe[2] = { -1, -1 };
099e26bd 197
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198int apps_cmd_notify_pipe[2] = { -1, -1 };
199
1d4b027a 200/* Pthread, Mutexes and Semaphores */
1d4b027a 201static pthread_t apps_thread;
d0b96690 202static pthread_t apps_notify_thread;
099e26bd 203static pthread_t reg_apps_thread;
1d4b027a 204static pthread_t client_thread;
7a485870 205static pthread_t kernel_thread;
099e26bd 206static pthread_t dispatch_thread;
44a5e5eb 207static pthread_t health_thread;
0b2dc8df 208static pthread_t ht_cleanup_thread;
022d91ba 209static pthread_t agent_reg_thread;
ef367a93 210static pthread_t load_session_thread;
5eb91c98 211
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212/*
213 * UST registration command queue. This queue is tied with a futex and uses a N
214 * wakers / 1 waiter implemented and detailed in futex.c/.h
215 *
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216 * The thread_registration_apps and thread_dispatch_ust_registration uses this
217 * queue along with the wait/wake scheme. The thread_manage_apps receives down
218 * the line new application socket and monitors it for any I/O error or clean
219 * close that triggers an unregistration of the application.
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220 */
221static struct ust_cmd_queue ust_cmd_queue;
222
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223/*
224 * Pointer initialized before thread creation.
225 *
226 * This points to the tracing session list containing the session count and a
227 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
228 * MUST NOT be taken if you call a public function in session.c.
04ea676f 229 *
d063d709 230 * The lock is nested inside the structure: session_list_ptr->lock. Please use
54d01ffb 231 * session_lock_list and session_unlock_list for lock acquisition.
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232 */
233static struct ltt_session_list *session_list_ptr;
234
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235int ust_consumerd64_fd = -1;
236int ust_consumerd32_fd = -1;
237
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238static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN;
239static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN;
240static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR;
241static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR;
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242static int consumerd32_bin_override;
243static int consumerd64_bin_override;
244static int consumerd32_libdir_override;
245static int consumerd64_libdir_override;
fb09408a 246
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247static const char *module_proc_lttng = "/proc/lttng";
248
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249/*
250 * Consumer daemon state which is changed when spawning it, killing it or in
251 * case of a fatal error.
252 */
253enum consumerd_state {
254 CONSUMER_STARTED = 1,
255 CONSUMER_STOPPED = 2,
256 CONSUMER_ERROR = 3,
257};
258
259/*
260 * This consumer daemon state is used to validate if a client command will be
261 * able to reach the consumer. If not, the client is informed. For instance,
262 * doing a "lttng start" when the consumer state is set to ERROR will return an
263 * error to the client.
264 *
265 * The following example shows a possible race condition of this scheme:
266 *
267 * consumer thread error happens
268 * client cmd arrives
269 * client cmd checks state -> still OK
270 * consumer thread exit, sets error
271 * client cmd try to talk to consumer
272 * ...
273 *
274 * However, since the consumer is a different daemon, we have no way of making
275 * sure the command will reach it safely even with this state flag. This is why
276 * we consider that up to the state validation during command processing, the
277 * command is safe. After that, we can not guarantee the correctness of the
278 * client request vis-a-vis the consumer.
279 */
280static enum consumerd_state ust_consumerd_state;
281static enum consumerd_state kernel_consumerd_state;
282
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283/*
284 * Socket timeout for receiving and sending in seconds.
285 */
286static int app_socket_timeout;
287
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288/* Set in main() with the current page size. */
289long page_size;
290
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291/* Application health monitoring */
292struct health_app *health_sessiond;
293
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294/* Agent TCP port for registration. Used by the agent thread. */
295unsigned int agent_tcp_port = DEFAULT_AGENT_TCP_PORT;
4d076222 296
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297/* Am I root or not. */
298int is_root; /* Set to 1 if the daemon is running as root */
299
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300const char * const config_section_name = "sessiond";
301
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302/* Load session thread information to operate. */
303struct load_session_thread_data *load_info;
304
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305/*
306 * Whether sessiond is ready for commands/health check requests.
307 * NR_LTTNG_SESSIOND_READY must match the number of calls to
ef367a93 308 * sessiond_notify_ready().
97bc1426 309 */
ef367a93 310#define NR_LTTNG_SESSIOND_READY 3
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311int lttng_sessiond_ready = NR_LTTNG_SESSIOND_READY;
312
313/* Notify parents that we are ready for cmd and health check */
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314LTTNG_HIDDEN
315void sessiond_notify_ready(void)
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316{
317 if (uatomic_sub_return(&lttng_sessiond_ready, 1) == 0) {
318 /*
319 * Notify parent pid that we are ready to accept command
320 * for client side. This ppid is the one from the
321 * external process that spawned us.
322 */
323 if (opt_sig_parent) {
324 kill(ppid, SIGUSR1);
325 }
326
327 /*
328 * Notify the parent of the fork() process that we are
329 * ready.
330 */
72dd7491 331 if (opt_daemon || opt_background) {
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332 kill(child_ppid, SIGUSR1);
333 }
334 }
335}
336
fb09408a 337static
7753dea8 338void setup_consumerd_path(void)
fb09408a 339{
fc7a59ce 340 const char *bin, *libdir;
fb09408a 341
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MD
342 /*
343 * Allow INSTALL_BIN_PATH to be used as a target path for the
ebaeda94
MD
344 * native architecture size consumer if CONFIG_CONSUMER*_PATH
345 * has not been defined.
7753dea8 346 */
ebaeda94 347#if (CAA_BITS_PER_LONG == 32)
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AM
348 if (!consumerd32_bin[0]) {
349 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
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350 }
351 if (!consumerd32_libdir[0]) {
352 consumerd32_libdir = INSTALL_LIB_PATH;
353 }
354#elif (CAA_BITS_PER_LONG == 64)
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355 if (!consumerd64_bin[0]) {
356 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
7753dea8 357 }
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358 if (!consumerd64_libdir[0]) {
359 consumerd64_libdir = INSTALL_LIB_PATH;
7753dea8
MD
360 }
361#else
362#error "Unknown bitness"
363#endif
364
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365 /*
366 * runtime env. var. overrides the build default.
367 */
fc7a59ce
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368 bin = getenv("LTTNG_CONSUMERD32_BIN");
369 if (bin) {
370 consumerd32_bin = bin;
7753dea8 371 }
fc7a59ce
AM
372 bin = getenv("LTTNG_CONSUMERD64_BIN");
373 if (bin) {
374 consumerd64_bin = bin;
ebaeda94 375 }
72f579ee 376 libdir = getenv("LTTNG_CONSUMERD32_LIBDIR");
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377 if (libdir) {
378 consumerd32_libdir = libdir;
379 }
72f579ee 380 libdir = getenv("LTTNG_CONSUMERD64_LIBDIR");
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381 if (libdir) {
382 consumerd64_libdir = libdir;
fb09408a
MD
383 }
384}
385
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386/*
387 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
388 */
d0b96690 389int sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size)
5eb91c98
DG
390{
391 int ret;
392
d0b96690 393 assert(events);
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394
395 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
396 if (ret < 0) {
397 goto error;
398 }
399
400 /* Add quit pipe */
d0b96690 401 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN | LPOLLERR);
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402 if (ret < 0) {
403 goto error;
404 }
405
406 return 0;
407
408error:
409 return ret;
410}
411
412/*
413 * Check if the thread quit pipe was triggered.
414 *
415 * Return 1 if it was triggered else 0;
416 */
d0b96690 417int sessiond_check_thread_quit_pipe(int fd, uint32_t events)
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418{
419 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
420 return 1;
421 }
422
423 return 0;
424}
425
273ea72c 426/*
5eb91c98 427 * Init thread quit pipe.
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DG
428 *
429 * Return -1 on error or 0 if all pipes are created.
430 */
431static int init_thread_quit_pipe(void)
432{
730389d9 433 int ret, i;
273ea72c 434
730389d9 435 ret = pipe(thread_quit_pipe);
273ea72c 436 if (ret < 0) {
730389d9 437 PERROR("thread quit pipe");
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438 goto error;
439 }
440
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441 for (i = 0; i < 2; i++) {
442 ret = fcntl(thread_quit_pipe[i], F_SETFD, FD_CLOEXEC);
443 if (ret < 0) {
444 PERROR("fcntl");
445 goto error;
446 }
447 }
448
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449error:
450 return ret;
451}
452
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453/*
454 * Stop all threads by closing the thread quit pipe.
455 */
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456static void stop_threads(void)
457{
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458 int ret;
459
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460 /* Stopping all threads */
461 DBG("Terminating all threads");
54d01ffb 462 ret = notify_thread_pipe(thread_quit_pipe[1]);
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463 if (ret < 0) {
464 ERR("write error on thread quit pipe");
465 }
466
099e26bd 467 /* Dispatch thread */
26c9d55e 468 CMM_STORE_SHARED(dispatch_thread_exit, 1);
099e26bd 469 futex_nto1_wake(&ust_cmd_queue.futex);
cf3af59e
MD
470}
471
e975f9f8
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472/*
473 * Close every consumer sockets.
474 */
475static void close_consumer_sockets(void)
476{
477 int ret;
478
479 if (kconsumer_data.err_sock >= 0) {
480 ret = close(kconsumer_data.err_sock);
481 if (ret < 0) {
482 PERROR("kernel consumer err_sock close");
483 }
484 }
485 if (ustconsumer32_data.err_sock >= 0) {
486 ret = close(ustconsumer32_data.err_sock);
487 if (ret < 0) {
a76cbd9f 488 PERROR("UST consumerd32 err_sock close");
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DG
489 }
490 }
491 if (ustconsumer64_data.err_sock >= 0) {
492 ret = close(ustconsumer64_data.err_sock);
493 if (ret < 0) {
a76cbd9f 494 PERROR("UST consumerd64 err_sock close");
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DG
495 }
496 }
497 if (kconsumer_data.cmd_sock >= 0) {
498 ret = close(kconsumer_data.cmd_sock);
499 if (ret < 0) {
500 PERROR("kernel consumer cmd_sock close");
501 }
502 }
503 if (ustconsumer32_data.cmd_sock >= 0) {
504 ret = close(ustconsumer32_data.cmd_sock);
505 if (ret < 0) {
a76cbd9f 506 PERROR("UST consumerd32 cmd_sock close");
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DG
507 }
508 }
509 if (ustconsumer64_data.cmd_sock >= 0) {
510 ret = close(ustconsumer64_data.cmd_sock);
511 if (ret < 0) {
a76cbd9f 512 PERROR("UST consumerd64 cmd_sock close");
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DG
513 }
514 }
515}
516
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517/*
518 * Generate the full lock file path using the rundir.
519 *
520 * Return the snprintf() return value thus a negative value is an error.
521 */
522static int generate_lock_file_path(char *path, size_t len)
523{
524 int ret;
525
526 assert(path);
527 assert(rundir);
528
529 /* Build lockfile path from rundir. */
530 ret = snprintf(path, len, "%s/" DEFAULT_LTTNG_SESSIOND_LOCKFILE, rundir);
531 if (ret < 0) {
532 PERROR("snprintf lockfile path");
533 }
534
535 return ret;
536}
537
fac6795d 538/*
d063d709 539 * Cleanup the daemon
fac6795d 540 */
cf3af59e 541static void cleanup(void)
fac6795d 542{
ef599319 543 int ret;
af9737e9 544 struct ltt_session *sess, *stmp;
8c6c56c2 545 char path[PATH_MAX];
fac6795d 546
1d4b027a 547 DBG("Cleaning up");
e07ae692 548
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549 /*
550 * Close the thread quit pipe. It has already done its job,
551 * since we are now called.
552 */
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553 utils_close_pipe(thread_quit_pipe);
554
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555 /*
556 * If opt_pidfile is undefined, the default file will be wiped when
557 * removing the rundir.
558 */
559 if (opt_pidfile) {
560 ret = remove(opt_pidfile);
561 if (ret < 0) {
562 PERROR("remove pidfile %s", opt_pidfile);
563 }
564 }
565
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566 DBG("Removing sessiond and consumerd content of directory %s", rundir);
567
568 /* sessiond */
569 snprintf(path, PATH_MAX,
570 "%s/%s",
571 rundir, DEFAULT_LTTNG_SESSIOND_PIDFILE);
572 DBG("Removing %s", path);
573 (void) unlink(path);
574
cd9290dd 575 snprintf(path, PATH_MAX, "%s/%s", rundir,
022d91ba 576 DEFAULT_LTTNG_SESSIOND_AGENTPORT_FILE);
cd9290dd
DG
577 DBG("Removing %s", path);
578 (void) unlink(path);
579
8c6c56c2
MD
580 /* kconsumerd */
581 snprintf(path, PATH_MAX,
582 DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
583 rundir);
584 DBG("Removing %s", path);
585 (void) unlink(path);
586
587 snprintf(path, PATH_MAX,
588 DEFAULT_KCONSUMERD_PATH,
589 rundir);
590 DBG("Removing directory %s", path);
591 (void) rmdir(path);
592
593 /* ust consumerd 32 */
594 snprintf(path, PATH_MAX,
595 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH,
596 rundir);
597 DBG("Removing %s", path);
598 (void) unlink(path);
599
600 snprintf(path, PATH_MAX,
601 DEFAULT_USTCONSUMERD32_PATH,
602 rundir);
603 DBG("Removing directory %s", path);
604 (void) rmdir(path);
605
606 /* ust consumerd 64 */
607 snprintf(path, PATH_MAX,
608 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH,
609 rundir);
610 DBG("Removing %s", path);
611 (void) unlink(path);
612
613 snprintf(path, PATH_MAX,
614 DEFAULT_USTCONSUMERD64_PATH,
615 rundir);
616 DBG("Removing directory %s", path);
617 (void) rmdir(path);
5461b305 618
99bab54f 619 DBG("Cleaning up all sessions");
fac6795d 620
b5541356 621 /* Destroy session list mutex */
273ea72c
DG
622 if (session_list_ptr != NULL) {
623 pthread_mutex_destroy(&session_list_ptr->lock);
624
625 /* Cleanup ALL session */
54d01ffb
DG
626 cds_list_for_each_entry_safe(sess, stmp,
627 &session_list_ptr->head, list) {
2f77fc4b 628 cmd_destroy_session(sess, kernel_poll_pipe[1]);
273ea72c
DG
629 }
630 }
631
099e26bd 632 DBG("Closing all UST sockets");
56fff090 633 ust_app_clean_list();
7972aab2 634 buffer_reg_destroy_registries();
099e26bd 635
4fba7219
DG
636 if (is_root && !opt_no_kernel) {
637 DBG2("Closing kernel fd");
a4b35e07 638 if (kernel_tracer_fd >= 0) {
76d7553f
MD
639 ret = close(kernel_tracer_fd);
640 if (ret) {
641 PERROR("close");
642 }
a4b35e07 643 }
2f50c8a3 644 DBG("Unloading kernel modules");
096102bd 645 modprobe_remove_lttng_all();
834978fd 646 free(syscall_table);
2f50c8a3 647 }
2f77fc4b 648
e975f9f8
DG
649 close_consumer_sockets();
650
26296c48
JG
651 /*
652 * If the override option is set, the pointer points to a *non* const thus
653 * freeing it even though the variable type is set to const.
654 */
655 if (tracing_group_name_override) {
656 free((void *) tracing_group_name);
657 }
658 if (consumerd32_bin_override) {
659 free((void *) consumerd32_bin);
660 }
661 if (consumerd64_bin_override) {
662 free((void *) consumerd64_bin);
663 }
664 if (consumerd32_libdir_override) {
665 free((void *) consumerd32_libdir);
666 }
667 if (consumerd64_libdir_override) {
668 free((void *) consumerd64_libdir);
669 }
670
671 if (opt_pidfile) {
672 free(opt_pidfile);
673 }
674
ef367a93
JG
675 if (opt_load_session_path) {
676 free(opt_load_session_path);
677 }
678
679 if (load_info) {
680 load_session_destroy_data(load_info);
681 free(load_info);
682 }
683
c9cb3e7d
JG
684 /*
685 * Cleanup lock file by deleting it and finaly closing it which will
686 * release the file system lock.
687 */
688 if (lockfile_fd >= 0) {
689 char lockfile_path[PATH_MAX];
690
691 ret = generate_lock_file_path(lockfile_path, sizeof(lockfile_path));
692 if (ret > 0) {
693 ret = remove(lockfile_path);
694 if (ret < 0) {
695 PERROR("remove lock file");
696 }
697 ret = close(lockfile_fd);
698 if (ret < 0) {
699 PERROR("close lock file");
700 }
701 }
702 }
703
704 /*
705 * We do NOT rmdir rundir because there are other processes
706 * using it, for instance lttng-relayd, which can start in
707 * parallel with this teardown.
708 */
709
710 free(rundir);
711
421cb601 712 /* <fun> */
f56a39af 713 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
421cb601
DG
714 "Matthew, BEET driven development works!%c[%dm",
715 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
716 /* </fun> */
fac6795d
DG
717}
718
e065084a 719/*
d063d709 720 * Send data on a unix socket using the liblttsessiondcomm API.
e065084a 721 *
d063d709 722 * Return lttcomm error code.
e065084a
DG
723 */
724static int send_unix_sock(int sock, void *buf, size_t len)
725{
726 /* Check valid length */
c617c0c6 727 if (len == 0) {
e065084a
DG
728 return -1;
729 }
730
731 return lttcomm_send_unix_sock(sock, buf, len);
732}
733
5461b305 734/*
d063d709 735 * Free memory of a command context structure.
5461b305 736 */
a2fb29a5 737static void clean_command_ctx(struct command_ctx **cmd_ctx)
5461b305 738{
a2fb29a5
DG
739 DBG("Clean command context structure");
740 if (*cmd_ctx) {
741 if ((*cmd_ctx)->llm) {
742 free((*cmd_ctx)->llm);
5461b305 743 }
a2fb29a5
DG
744 if ((*cmd_ctx)->lsm) {
745 free((*cmd_ctx)->lsm);
5461b305 746 }
a2fb29a5
DG
747 free(*cmd_ctx);
748 *cmd_ctx = NULL;
5461b305
DG
749 }
750}
751
fac6795d 752/*
0fdd1e2c 753 * Notify UST applications using the shm mmap futex.
fac6795d 754 */
0fdd1e2c 755static int notify_ust_apps(int active)
fac6795d 756{
0fdd1e2c 757 char *wait_shm_mmap;
fac6795d 758
0fdd1e2c 759 DBG("Notifying applications of session daemon state: %d", active);
e07ae692 760
0fdd1e2c
DG
761 /* See shm.c for this call implying mmap, shm and futex calls */
762 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
763 if (wait_shm_mmap == NULL) {
fac6795d
DG
764 goto error;
765 }
766
0fdd1e2c
DG
767 /* Wake waiting process */
768 futex_wait_update((int32_t *) wait_shm_mmap, active);
769
770 /* Apps notified successfully */
771 return 0;
fac6795d
DG
772
773error:
0fdd1e2c 774 return -1;
fac6795d
DG
775}
776
e065084a 777/*
d063d709
DG
778 * Setup the outgoing data buffer for the response (llm) by allocating the
779 * right amount of memory and copying the original information from the lsm
780 * structure.
ca95a216 781 *
d063d709 782 * Return total size of the buffer pointed by buf.
ca95a216 783 */
5461b305 784static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
ca95a216 785{
f3ed775e 786 int ret, buf_size;
ca95a216 787
f3ed775e 788 buf_size = size;
5461b305 789
ba7f0ae5 790 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
5461b305 791 if (cmd_ctx->llm == NULL) {
76d7553f 792 PERROR("zmalloc");
5461b305 793 ret = -ENOMEM;
ca95a216
DG
794 goto error;
795 }
796
5461b305
DG
797 /* Copy common data */
798 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
9f19cc17 799 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
5461b305 800
5461b305
DG
801 cmd_ctx->llm->data_size = size;
802 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
803
ca95a216
DG
804 return buf_size;
805
806error:
807 return ret;
808}
809
7a485870 810/*
5eb91c98 811 * Update the kernel poll set of all channel fd available over all tracing
d063d709 812 * session. Add the wakeup pipe at the end of the set.
7a485870 813 */
5eb91c98 814static int update_kernel_poll(struct lttng_poll_event *events)
7a485870 815{
5eb91c98 816 int ret;
7a485870
DG
817 struct ltt_session *session;
818 struct ltt_kernel_channel *channel;
819
5eb91c98 820 DBG("Updating kernel poll set");
7a485870 821
54d01ffb 822 session_lock_list();
b5541356 823 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 824 session_lock(session);
7a485870 825 if (session->kernel_session == NULL) {
54d01ffb 826 session_unlock(session);
7a485870
DG
827 continue;
828 }
7a485870 829
54d01ffb
DG
830 cds_list_for_each_entry(channel,
831 &session->kernel_session->channel_list.head, list) {
5eb91c98
DG
832 /* Add channel fd to the kernel poll set */
833 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
834 if (ret < 0) {
54d01ffb 835 session_unlock(session);
5eb91c98
DG
836 goto error;
837 }
838 DBG("Channel fd %d added to kernel set", channel->fd);
7a485870 839 }
54d01ffb 840 session_unlock(session);
7a485870 841 }
54d01ffb 842 session_unlock_list();
7a485870 843
5eb91c98 844 return 0;
7a485870
DG
845
846error:
54d01ffb 847 session_unlock_list();
7a485870
DG
848 return -1;
849}
850
851/*
54d01ffb 852 * Find the channel fd from 'fd' over all tracing session. When found, check
d063d709 853 * for new channel stream and send those stream fds to the kernel consumer.
7a485870 854 *
d063d709 855 * Useful for CPU hotplug feature.
7a485870 856 */
2bdd86d4 857static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
7a485870
DG
858{
859 int ret = 0;
860 struct ltt_session *session;
173af62f 861 struct ltt_kernel_session *ksess;
7a485870
DG
862 struct ltt_kernel_channel *channel;
863
864 DBG("Updating kernel streams for channel fd %d", fd);
865
54d01ffb 866 session_lock_list();
b5541356 867 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 868 session_lock(session);
7a485870 869 if (session->kernel_session == NULL) {
54d01ffb 870 session_unlock(session);
7a485870
DG
871 continue;
872 }
173af62f 873 ksess = session->kernel_session;
d9800920 874
173af62f 875 cds_list_for_each_entry(channel, &ksess->channel_list.head, list) {
7a485870
DG
876 if (channel->fd == fd) {
877 DBG("Channel found, updating kernel streams");
878 ret = kernel_open_channel_stream(channel);
879 if (ret < 0) {
b3c750d2 880 goto error;
7a485870 881 }
5c786ded
JD
882 /* Update the stream global counter */
883 ksess->stream_count_global += ret;
d9800920 884
7a485870 885 /*
5eb91c98
DG
886 * Have we already sent fds to the consumer? If yes, it means
887 * that tracing is started so it is safe to send our updated
888 * stream fds.
7a485870 889 */
173af62f
DG
890 if (ksess->consumer_fds_sent == 1 && ksess->consumer != NULL) {
891 struct lttng_ht_iter iter;
892 struct consumer_socket *socket;
893
e7fe706f 894 rcu_read_lock();
173af62f
DG
895 cds_lfht_for_each_entry(ksess->consumer->socks->ht,
896 &iter.iter, socket, node.node) {
173af62f 897 pthread_mutex_lock(socket->lock);
f50f23d9 898 ret = kernel_consumer_send_channel_stream(socket,
2bba9e53
DG
899 channel, ksess,
900 session->output_traces ? 1 : 0);
173af62f
DG
901 pthread_mutex_unlock(socket->lock);
902 if (ret < 0) {
e7fe706f 903 rcu_read_unlock();
173af62f
DG
904 goto error;
905 }
7a485870 906 }
e7fe706f 907 rcu_read_unlock();
7a485870 908 }
b3c750d2 909 goto error;
7a485870
DG
910 }
911 }
54d01ffb 912 session_unlock(session);
7a485870 913 }
54d01ffb 914 session_unlock_list();
b3c750d2 915 return ret;
7a485870 916
b3c750d2 917error:
54d01ffb
DG
918 session_unlock(session);
919 session_unlock_list();
7a485870
DG
920 return ret;
921}
922
487cf67c 923/*
ffe60014
DG
924 * For each tracing session, update newly registered apps. The session list
925 * lock MUST be acquired before calling this.
487cf67c
DG
926 */
927static void update_ust_app(int app_sock)
928{
929 struct ltt_session *sess, *stmp;
930
fdadac08
DG
931 /* Consumer is in an ERROR state. Stop any application update. */
932 if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) {
933 /* Stop the update process since the consumer is dead. */
934 return;
935 }
936
487cf67c
DG
937 /* For all tracing session(s) */
938 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
4ee14516 939 session_lock(sess);
421cb601
DG
940 if (sess->ust_session) {
941 ust_app_global_update(sess->ust_session, app_sock);
942 }
4ee14516 943 session_unlock(sess);
487cf67c
DG
944 }
945}
946
7a485870 947/*
d063d709 948 * This thread manage event coming from the kernel.
7a485870 949 *
d063d709
DG
950 * Features supported in this thread:
951 * -) CPU Hotplug
7a485870
DG
952 */
953static void *thread_manage_kernel(void *data)
954{
139ac872 955 int ret, i, pollfd, update_poll_flag = 1, err = -1;
5eb91c98 956 uint32_t revents, nb_fd;
7a485870 957 char tmp;
5eb91c98 958 struct lttng_poll_event events;
7a485870 959
6993eeb3 960 DBG("[thread] Thread manage kernel started");
7a485870 961
6c71277b 962 health_register(health_sessiond, HEALTH_SESSIOND_TYPE_KERNEL);
927ca06a 963
d5d63bf1
DG
964 /*
965 * This first step of the while is to clean this structure which could free
6d737ce4 966 * non NULL pointers so initialize it before the loop.
d5d63bf1 967 */
6d737ce4 968 lttng_poll_init(&events);
d5d63bf1 969
e547b070 970 if (testpoint(sessiond_thread_manage_kernel)) {
6993eeb3
CB
971 goto error_testpoint;
972 }
8ac94142 973
840cb59c 974 health_code_update();
44a5e5eb 975
e547b070 976 if (testpoint(sessiond_thread_manage_kernel_before_loop)) {
d21b0d71 977 goto error_testpoint;
6993eeb3
CB
978 }
979
7a485870 980 while (1) {
840cb59c 981 health_code_update();
44a5e5eb 982
7a485870 983 if (update_poll_flag == 1) {
d21b0d71
DG
984 /* Clean events object. We are about to populate it again. */
985 lttng_poll_clean(&events);
986
d0b96690 987 ret = sessiond_set_thread_pollset(&events, 2);
d21b0d71
DG
988 if (ret < 0) {
989 goto error_poll_create;
990 }
991
992 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
993 if (ret < 0) {
994 goto error;
995 }
5f822d0a 996
d21b0d71 997 /* This will add the available kernel channel if any. */
5eb91c98
DG
998 ret = update_kernel_poll(&events);
999 if (ret < 0) {
7a485870
DG
1000 goto error;
1001 }
1002 update_poll_flag = 0;
1003 }
1004
d21b0d71 1005 DBG("Thread kernel polling on %d fds", LTTNG_POLL_GETNB(&events));
7a485870
DG
1006
1007 /* Poll infinite value of time */
88f2b785 1008 restart:
a78af745 1009 health_poll_entry();
5eb91c98 1010 ret = lttng_poll_wait(&events, -1);
a78af745 1011 health_poll_exit();
7a485870 1012 if (ret < 0) {
88f2b785
MD
1013 /*
1014 * Restart interrupted system call.
1015 */
1016 if (errno == EINTR) {
1017 goto restart;
1018 }
7a485870
DG
1019 goto error;
1020 } else if (ret == 0) {
1021 /* Should not happen since timeout is infinite */
85611738
DG
1022 ERR("Return value of poll is 0 with an infinite timeout.\n"
1023 "This should not have happened! Continuing...");
7a485870
DG
1024 continue;
1025 }
1026
0d9c5d77
DG
1027 nb_fd = ret;
1028
5eb91c98
DG
1029 for (i = 0; i < nb_fd; i++) {
1030 /* Fetch once the poll data */
1031 revents = LTTNG_POLL_GETEV(&events, i);
1032 pollfd = LTTNG_POLL_GETFD(&events, i);
7a485870 1033
840cb59c 1034 health_code_update();
44a5e5eb 1035
5eb91c98 1036 /* Thread quit pipe has been closed. Killing thread. */
d0b96690 1037 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
5eb91c98 1038 if (ret) {
139ac872
MD
1039 err = 0;
1040 goto exit;
5eb91c98 1041 }
7a485870 1042
5eb91c98
DG
1043 /* Check for data on kernel pipe */
1044 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
6cd525e8
MD
1045 (void) lttng_read(kernel_poll_pipe[0],
1046 &tmp, 1);
f921c78f
DG
1047 /*
1048 * Ret value is useless here, if this pipe gets any actions an
1049 * update is required anyway.
1050 */
5eb91c98
DG
1051 update_poll_flag = 1;
1052 continue;
1053 } else {
1054 /*
1055 * New CPU detected by the kernel. Adding kernel stream to
1056 * kernel session and updating the kernel consumer
1057 */
1058 if (revents & LPOLLIN) {
2bdd86d4 1059 ret = update_kernel_stream(&kconsumer_data, pollfd);
5eb91c98
DG
1060 if (ret < 0) {
1061 continue;
1062 }
1063 break;
1064 /*
1065 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
1066 * and unregister kernel stream at this point.
1067 */
7a485870 1068 }
7a485870
DG
1069 }
1070 }
1071 }
1072
139ac872 1073exit:
7a485870 1074error:
5eb91c98 1075 lttng_poll_clean(&events);
76d7553f 1076error_poll_create:
6993eeb3 1077error_testpoint:
6620da75
DG
1078 utils_close_pipe(kernel_poll_pipe);
1079 kernel_poll_pipe[0] = kernel_poll_pipe[1] = -1;
139ac872 1080 if (err) {
840cb59c 1081 health_error();
139ac872 1082 ERR("Health error occurred in %s", __func__);
6620da75
DG
1083 WARN("Kernel thread died unexpectedly. "
1084 "Kernel tracing can continue but CPU hotplug is disabled.");
139ac872 1085 }
8782cc74 1086 health_unregister(health_sessiond);
76d7553f 1087 DBG("Kernel thread dying");
7a485870
DG
1088 return NULL;
1089}
1090
a23ec3a7
DG
1091/*
1092 * Signal pthread condition of the consumer data that the thread.
1093 */
1094static void signal_consumer_condition(struct consumer_data *data, int state)
1095{
1096 pthread_mutex_lock(&data->cond_mutex);
1097
1098 /*
1099 * The state is set before signaling. It can be any value, it's the waiter
1100 * job to correctly interpret this condition variable associated to the
1101 * consumer pthread_cond.
1102 *
1103 * A value of 0 means that the corresponding thread of the consumer data
1104 * was not started. 1 indicates that the thread has started and is ready
1105 * for action. A negative value means that there was an error during the
1106 * thread bootstrap.
1107 */
1108 data->consumer_thread_is_ready = state;
1109 (void) pthread_cond_signal(&data->cond);
1110
1111 pthread_mutex_unlock(&data->cond_mutex);
1112}
1113
1d4b027a 1114/*
3bd1e081 1115 * This thread manage the consumer error sent back to the session daemon.
1d4b027a 1116 */
3bd1e081 1117static void *thread_manage_consumer(void *data)
1d4b027a 1118{
42fc1d0b 1119 int sock = -1, i, ret, pollfd, err = -1, should_quit = 0;
5eb91c98 1120 uint32_t revents, nb_fd;
1d4b027a 1121 enum lttcomm_return_code code;
5eb91c98 1122 struct lttng_poll_event events;
3bd1e081 1123 struct consumer_data *consumer_data = data;
1d4b027a 1124
3bd1e081 1125 DBG("[thread] Manage consumer started");
1d4b027a 1126
6c71277b 1127 health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CONSUMER);
927ca06a 1128
855060f8 1129 health_code_update();
9449cc75 1130
5eb91c98 1131 /*
331744e3
JD
1132 * Pass 3 as size here for the thread quit pipe, consumerd_err_sock and the
1133 * metadata_sock. Nothing more will be added to this poll set.
5eb91c98 1134 */
331744e3 1135 ret = sessiond_set_thread_pollset(&events, 3);
5eb91c98 1136 if (ret < 0) {
76d7553f 1137 goto error_poll;
5eb91c98 1138 }
273ea72c 1139
edb8b045
DG
1140 /*
1141 * The error socket here is already in a listening state which was done
1142 * just before spawning this thread to avoid a race between the consumer
1143 * daemon exec trying to connect and the listen() call.
1144 */
3bd1e081 1145 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
5eb91c98
DG
1146 if (ret < 0) {
1147 goto error;
1148 }
1149
840cb59c 1150 health_code_update();
44a5e5eb 1151
331744e3 1152 /* Infinite blocking call, waiting for transmission */
88f2b785 1153restart:
a78af745 1154 health_poll_entry();
8ac94142 1155
e547b070 1156 if (testpoint(sessiond_thread_manage_consumer)) {
6993eeb3
CB
1157 goto error;
1158 }
8ac94142 1159
5eb91c98 1160 ret = lttng_poll_wait(&events, -1);
a78af745 1161 health_poll_exit();
273ea72c 1162 if (ret < 0) {
88f2b785
MD
1163 /*
1164 * Restart interrupted system call.
1165 */
1166 if (errno == EINTR) {
1167 goto restart;
1168 }
273ea72c
DG
1169 goto error;
1170 }
1171
0d9c5d77
DG
1172 nb_fd = ret;
1173
5eb91c98
DG
1174 for (i = 0; i < nb_fd; i++) {
1175 /* Fetch once the poll data */
1176 revents = LTTNG_POLL_GETEV(&events, i);
1177 pollfd = LTTNG_POLL_GETFD(&events, i);
1178
840cb59c 1179 health_code_update();
44a5e5eb 1180
5eb91c98 1181 /* Thread quit pipe has been closed. Killing thread. */
d0b96690 1182 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
5eb91c98 1183 if (ret) {
139ac872
MD
1184 err = 0;
1185 goto exit;
5eb91c98
DG
1186 }
1187
1188 /* Event on the registration socket */
3bd1e081 1189 if (pollfd == consumer_data->err_sock) {
5eb91c98 1190 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 1191 ERR("consumer err socket poll error");
5eb91c98
DG
1192 goto error;
1193 }
1194 }
273ea72c
DG
1195 }
1196
3bd1e081 1197 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
1d4b027a
DG
1198 if (sock < 0) {
1199 goto error;
1200 }
1201
b662582b
DG
1202 /*
1203 * Set the CLOEXEC flag. Return code is useless because either way, the
1204 * show must go on.
1205 */
1206 (void) utils_set_fd_cloexec(sock);
1207
840cb59c 1208 health_code_update();
44a5e5eb 1209
3bd1e081 1210 DBG2("Receiving code from consumer err_sock");
ee0b0061 1211
712ea556 1212 /* Getting status code from kconsumerd */
54d01ffb
DG
1213 ret = lttcomm_recv_unix_sock(sock, &code,
1214 sizeof(enum lttcomm_return_code));
1d4b027a
DG
1215 if (ret <= 0) {
1216 goto error;
1217 }
1218
840cb59c 1219 health_code_update();
f73fabfd 1220 if (code == LTTCOMM_CONSUMERD_COMMAND_SOCK_READY) {
331744e3 1221 /* Connect both socket, command and metadata. */
3bd1e081
MD
1222 consumer_data->cmd_sock =
1223 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
4ce514c4 1224 consumer_data->metadata_fd =
331744e3 1225 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
92db7cdc
DG
1226 if (consumer_data->cmd_sock < 0
1227 || consumer_data->metadata_fd < 0) {
331744e3 1228 PERROR("consumer connect cmd socket");
a23ec3a7
DG
1229 /* On error, signal condition and quit. */
1230 signal_consumer_condition(consumer_data, -1);
1d4b027a
DG
1231 goto error;
1232 }
9363801e 1233 consumer_data->metadata_sock.fd_ptr = &consumer_data->metadata_fd;
331744e3
JD
1234 /* Create metadata socket lock. */
1235 consumer_data->metadata_sock.lock = zmalloc(sizeof(pthread_mutex_t));
1236 if (consumer_data->metadata_sock.lock == NULL) {
1237 PERROR("zmalloc pthread mutex");
1238 ret = -1;
1239 goto error;
1240 }
1241 pthread_mutex_init(consumer_data->metadata_sock.lock, NULL);
1242
a23ec3a7 1243 signal_consumer_condition(consumer_data, 1);
331744e3
JD
1244 DBG("Consumer command socket ready (fd: %d", consumer_data->cmd_sock);
1245 DBG("Consumer metadata socket ready (fd: %d)",
4ce514c4 1246 consumer_data->metadata_fd);
1d4b027a 1247 } else {
3bd1e081 1248 ERR("consumer error when waiting for SOCK_READY : %s",
1d4b027a
DG
1249 lttcomm_get_readable_code(-code));
1250 goto error;
1251 }
1252
331744e3 1253 /* Remove the consumerd error sock since we've established a connexion */
3bd1e081 1254 ret = lttng_poll_del(&events, consumer_data->err_sock);
72079cae 1255 if (ret < 0) {
72079cae
DG
1256 goto error;
1257 }
1258
331744e3 1259 /* Add new accepted error socket. */
5eb91c98
DG
1260 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1261 if (ret < 0) {
72079cae 1262 goto error;
5eb91c98
DG
1263 }
1264
331744e3 1265 /* Add metadata socket that is successfully connected. */
4ce514c4 1266 ret = lttng_poll_add(&events, consumer_data->metadata_fd,
331744e3
JD
1267 LPOLLIN | LPOLLRDHUP);
1268 if (ret < 0) {
1269 goto error;
1270 }
1271
840cb59c 1272 health_code_update();
44a5e5eb 1273
331744e3 1274 /* Infinite blocking call, waiting for transmission */
88f2b785 1275restart_poll:
331744e3 1276 while (1) {
42fc1d0b
DG
1277 health_code_update();
1278
1279 /* Exit the thread because the thread quit pipe has been triggered. */
1280 if (should_quit) {
1281 /* Not a health error. */
1282 err = 0;
1283 goto exit;
1284 }
1285
331744e3
JD
1286 health_poll_entry();
1287 ret = lttng_poll_wait(&events, -1);
1288 health_poll_exit();
1289 if (ret < 0) {
1290 /*
1291 * Restart interrupted system call.
1292 */
1293 if (errno == EINTR) {
1294 goto restart_poll;
1295 }
1296 goto error;
88f2b785 1297 }
72079cae 1298
331744e3 1299 nb_fd = ret;
0d9c5d77 1300
331744e3
JD
1301 for (i = 0; i < nb_fd; i++) {
1302 /* Fetch once the poll data */
1303 revents = LTTNG_POLL_GETEV(&events, i);
1304 pollfd = LTTNG_POLL_GETFD(&events, i);
5eb91c98 1305
331744e3 1306 health_code_update();
44a5e5eb 1307
42fc1d0b
DG
1308 /*
1309 * Thread quit pipe has been triggered, flag that we should stop
1310 * but continue the current loop to handle potential data from
1311 * consumer.
1312 */
1313 should_quit = sessiond_check_thread_quit_pipe(pollfd, revents);
5eb91c98 1314
331744e3
JD
1315 if (pollfd == sock) {
1316 /* Event on the consumerd socket */
1317 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1318 ERR("consumer err socket second poll error");
1319 goto error;
1320 }
1321 health_code_update();
1322 /* Wait for any kconsumerd error */
1323 ret = lttcomm_recv_unix_sock(sock, &code,
1324 sizeof(enum lttcomm_return_code));
1325 if (ret <= 0) {
1326 ERR("consumer closed the command socket");
1327 goto error;
1328 }
1329
1330 ERR("consumer return code : %s",
1331 lttcomm_get_readable_code(-code));
1332
1333 goto exit;
4ce514c4 1334 } else if (pollfd == consumer_data->metadata_fd) {
331744e3
JD
1335 /* UST metadata requests */
1336 ret = ust_consumer_metadata_request(
1337 &consumer_data->metadata_sock);
1338 if (ret < 0) {
1339 ERR("Handling metadata request");
1340 goto error;
1341 }
5eb91c98 1342 }
42fc1d0b 1343 /* No need for an else branch all FDs are tested prior. */
5eb91c98 1344 }
331744e3 1345 health_code_update();
5eb91c98
DG
1346 }
1347
139ac872 1348exit:
1d4b027a 1349error:
fdadac08
DG
1350 /*
1351 * We lock here because we are about to close the sockets and some other
92db7cdc
DG
1352 * thread might be using them so get exclusive access which will abort all
1353 * other consumer command by other threads.
fdadac08
DG
1354 */
1355 pthread_mutex_lock(&consumer_data->lock);
1356
5c827ce0
DG
1357 /* Immediately set the consumerd state to stopped */
1358 if (consumer_data->type == LTTNG_CONSUMER_KERNEL) {
1359 uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR);
1360 } else if (consumer_data->type == LTTNG_CONSUMER64_UST ||
1361 consumer_data->type == LTTNG_CONSUMER32_UST) {
1362 uatomic_set(&ust_consumerd_state, CONSUMER_ERROR);
1363 } else {
1364 /* Code flow error... */
1365 assert(0);
1366 }
1367
76d7553f
MD
1368 if (consumer_data->err_sock >= 0) {
1369 ret = close(consumer_data->err_sock);
1370 if (ret) {
1371 PERROR("close");
1372 }
a76cbd9f 1373 consumer_data->err_sock = -1;
76d7553f
MD
1374 }
1375 if (consumer_data->cmd_sock >= 0) {
1376 ret = close(consumer_data->cmd_sock);
1377 if (ret) {
1378 PERROR("close");
1379 }
a76cbd9f 1380 consumer_data->cmd_sock = -1;
76d7553f 1381 }
96544455
SS
1382 if (consumer_data->metadata_sock.fd_ptr &&
1383 *consumer_data->metadata_sock.fd_ptr >= 0) {
9363801e 1384 ret = close(*consumer_data->metadata_sock.fd_ptr);
331744e3
JD
1385 if (ret) {
1386 PERROR("close");
1387 }
1388 }
76d7553f
MD
1389 if (sock >= 0) {
1390 ret = close(sock);
1391 if (ret) {
1392 PERROR("close");
1393 }
1394 }
273ea72c 1395
3bd1e081
MD
1396 unlink(consumer_data->err_unix_sock_path);
1397 unlink(consumer_data->cmd_unix_sock_path);
1398 consumer_data->pid = 0;
fdadac08 1399 pthread_mutex_unlock(&consumer_data->lock);
92db7cdc 1400
fdadac08 1401 /* Cleanup metadata socket mutex. */
96544455
SS
1402 if (consumer_data->metadata_sock.lock) {
1403 pthread_mutex_destroy(consumer_data->metadata_sock.lock);
1404 free(consumer_data->metadata_sock.lock);
1405 }
5eb91c98 1406 lttng_poll_clean(&events);
76d7553f 1407error_poll:
139ac872 1408 if (err) {
840cb59c 1409 health_error();
139ac872
MD
1410 ERR("Health error occurred in %s", __func__);
1411 }
8782cc74 1412 health_unregister(health_sessiond);
76d7553f 1413 DBG("consumer thread cleanup completed");
0177d773 1414
5eb91c98 1415 return NULL;
099e26bd
DG
1416}
1417
099e26bd
DG
1418/*
1419 * This thread manage application communication.
1d4b027a
DG
1420 */
1421static void *thread_manage_apps(void *data)
099e26bd 1422{
139ac872 1423 int i, ret, pollfd, err = -1;
6cd525e8 1424 ssize_t size_ret;
5eb91c98 1425 uint32_t revents, nb_fd;
5eb91c98 1426 struct lttng_poll_event events;
099e26bd
DG
1427
1428 DBG("[thread] Manage application started");
1429
f6a9efaa
DG
1430 rcu_register_thread();
1431 rcu_thread_online();
1432
6c71277b 1433 health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_MANAGE);
927ca06a 1434
e547b070 1435 if (testpoint(sessiond_thread_manage_apps)) {
6993eeb3
CB
1436 goto error_testpoint;
1437 }
1438
840cb59c 1439 health_code_update();
44a5e5eb 1440
d0b96690 1441 ret = sessiond_set_thread_pollset(&events, 2);
5eb91c98 1442 if (ret < 0) {
76d7553f 1443 goto error_poll_create;
5eb91c98 1444 }
099e26bd 1445
5eb91c98
DG
1446 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1447 if (ret < 0) {
1448 goto error;
1449 }
099e26bd 1450
e547b070 1451 if (testpoint(sessiond_thread_manage_apps_before_loop)) {
6993eeb3
CB
1452 goto error;
1453 }
8ac94142 1454
840cb59c 1455 health_code_update();
44a5e5eb 1456
5eb91c98 1457 while (1) {
d21b0d71 1458 DBG("Apps thread polling on %d fds", LTTNG_POLL_GETNB(&events));
099e26bd
DG
1459
1460 /* Inifinite blocking call, waiting for transmission */
88f2b785 1461 restart:
a78af745 1462 health_poll_entry();
5eb91c98 1463 ret = lttng_poll_wait(&events, -1);
a78af745 1464 health_poll_exit();
099e26bd 1465 if (ret < 0) {
88f2b785
MD
1466 /*
1467 * Restart interrupted system call.
1468 */
1469 if (errno == EINTR) {
1470 goto restart;
1471 }
099e26bd
DG
1472 goto error;
1473 }
1474
0d9c5d77
DG
1475 nb_fd = ret;
1476
5eb91c98
DG
1477 for (i = 0; i < nb_fd; i++) {
1478 /* Fetch once the poll data */
1479 revents = LTTNG_POLL_GETEV(&events, i);
1480 pollfd = LTTNG_POLL_GETFD(&events, i);
1481
840cb59c 1482 health_code_update();
44a5e5eb 1483
5eb91c98 1484 /* Thread quit pipe has been closed. Killing thread. */
d0b96690 1485 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
5eb91c98 1486 if (ret) {
139ac872
MD
1487 err = 0;
1488 goto exit;
5eb91c98 1489 }
099e26bd 1490
5eb91c98
DG
1491 /* Inspect the apps cmd pipe */
1492 if (pollfd == apps_cmd_pipe[0]) {
1493 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1494 ERR("Apps command pipe error");
0177d773 1495 goto error;
5eb91c98 1496 } else if (revents & LPOLLIN) {
d0b96690
DG
1497 int sock;
1498
5eb91c98 1499 /* Empty pipe */
6cd525e8
MD
1500 size_ret = lttng_read(apps_cmd_pipe[0], &sock, sizeof(sock));
1501 if (size_ret < sizeof(sock)) {
76d7553f 1502 PERROR("read apps cmd pipe");
5eb91c98
DG
1503 goto error;
1504 }
099e26bd 1505
840cb59c 1506 health_code_update();
44a5e5eb 1507
ffe60014 1508 /*
d0b96690
DG
1509 * We only monitor the error events of the socket. This
1510 * thread does not handle any incoming data from UST
1511 * (POLLIN).
ffe60014 1512 */
d0b96690
DG
1513 ret = lttng_poll_add(&events, sock,
1514 LPOLLERR | LPOLLHUP | LPOLLRDHUP);
1515 if (ret < 0) {
5eb91c98 1516 goto error;
e0c7ec2b 1517 }
acc7b41b 1518
d0b96690 1519 DBG("Apps with sock %d added to poll set", sock);
0177d773 1520 }
5eb91c98
DG
1521 } else {
1522 /*
54d01ffb
DG
1523 * At this point, we know that a registered application made
1524 * the event at poll_wait.
5eb91c98
DG
1525 */
1526 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1527 /* Removing from the poll set */
1528 ret = lttng_poll_del(&events, pollfd);
1529 if (ret < 0) {
1530 goto error;
1531 }
099e26bd 1532
b9d9b220 1533 /* Socket closed on remote end. */
56fff090 1534 ust_app_unregister(pollfd);
5eb91c98 1535 }
099e26bd 1536 }
44a5e5eb 1537
840cb59c 1538 health_code_update();
099e26bd 1539 }
099e26bd
DG
1540 }
1541
139ac872 1542exit:
099e26bd 1543error:
5eb91c98 1544 lttng_poll_clean(&events);
76d7553f 1545error_poll_create:
6993eeb3 1546error_testpoint:
6620da75
DG
1547 utils_close_pipe(apps_cmd_pipe);
1548 apps_cmd_pipe[0] = apps_cmd_pipe[1] = -1;
1549
1550 /*
1551 * We don't clean the UST app hash table here since already registered
1552 * applications can still be controlled so let them be until the session
1553 * daemon dies or the applications stop.
1554 */
1555
139ac872 1556 if (err) {
840cb59c 1557 health_error();
139ac872
MD
1558 ERR("Health error occurred in %s", __func__);
1559 }
8782cc74 1560 health_unregister(health_sessiond);
76d7553f 1561 DBG("Application communication apps thread cleanup complete");
f6a9efaa
DG
1562 rcu_thread_offline();
1563 rcu_unregister_thread();
099e26bd
DG
1564 return NULL;
1565}
1566
d0b96690 1567/*
d88aee68
DG
1568 * Send a socket to a thread This is called from the dispatch UST registration
1569 * thread once all sockets are set for the application.
d0b96690 1570 *
b85dc84c
DG
1571 * The sock value can be invalid, we don't really care, the thread will handle
1572 * it and make the necessary cleanup if so.
1573 *
d0b96690
DG
1574 * On success, return 0 else a negative value being the errno message of the
1575 * write().
1576 */
d88aee68 1577static int send_socket_to_thread(int fd, int sock)
d0b96690 1578{
6cd525e8 1579 ssize_t ret;
d0b96690 1580
b85dc84c
DG
1581 /*
1582 * It's possible that the FD is set as invalid with -1 concurrently just
1583 * before calling this function being a shutdown state of the thread.
1584 */
1585 if (fd < 0) {
1586 ret = -EBADF;
1587 goto error;
1588 }
d0b96690 1589
6cd525e8
MD
1590 ret = lttng_write(fd, &sock, sizeof(sock));
1591 if (ret < sizeof(sock)) {
d88aee68 1592 PERROR("write apps pipe %d", fd);
d0b96690
DG
1593 if (ret < 0) {
1594 ret = -errno;
1595 }
1596 goto error;
1597 }
1598
1599 /* All good. Don't send back the write positive ret value. */
1600 ret = 0;
1601error:
6cd525e8 1602 return (int) ret;
d0b96690
DG
1603}
1604
f45e313d
DG
1605/*
1606 * Sanitize the wait queue of the dispatch registration thread meaning removing
1607 * invalid nodes from it. This is to avoid memory leaks for the case the UST
1608 * notify socket is never received.
1609 */
1610static void sanitize_wait_queue(struct ust_reg_wait_queue *wait_queue)
1611{
1612 int ret, nb_fd = 0, i;
1613 unsigned int fd_added = 0;
1614 struct lttng_poll_event events;
1615 struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node;
1616
1617 assert(wait_queue);
1618
1619 lttng_poll_init(&events);
1620
1621 /* Just skip everything for an empty queue. */
1622 if (!wait_queue->count) {
1623 goto end;
1624 }
1625
1626 ret = lttng_poll_create(&events, wait_queue->count, LTTNG_CLOEXEC);
1627 if (ret < 0) {
1628 goto error_create;
1629 }
1630
1631 cds_list_for_each_entry_safe(wait_node, tmp_wait_node,
1632 &wait_queue->head, head) {
1633 assert(wait_node->app);
1634 ret = lttng_poll_add(&events, wait_node->app->sock,
1635 LPOLLHUP | LPOLLERR);
1636 if (ret < 0) {
1637 goto error;
1638 }
1639
1640 fd_added = 1;
1641 }
1642
1643 if (!fd_added) {
1644 goto end;
1645 }
1646
1647 /*
1648 * Poll but don't block so we can quickly identify the faulty events and
1649 * clean them afterwards from the wait queue.
1650 */
1651 ret = lttng_poll_wait(&events, 0);
1652 if (ret < 0) {
1653 goto error;
1654 }
1655 nb_fd = ret;
1656
1657 for (i = 0; i < nb_fd; i++) {
1658 /* Get faulty FD. */
1659 uint32_t revents = LTTNG_POLL_GETEV(&events, i);
1660 int pollfd = LTTNG_POLL_GETFD(&events, i);
1661
1662 cds_list_for_each_entry_safe(wait_node, tmp_wait_node,
1663 &wait_queue->head, head) {
1664 if (pollfd == wait_node->app->sock &&
1665 (revents & (LPOLLHUP | LPOLLERR))) {
1666 cds_list_del(&wait_node->head);
1667 wait_queue->count--;
1668 ust_app_destroy(wait_node->app);
1669 free(wait_node);
1670 break;
1671 }
1672 }
1673 }
1674
1675 if (nb_fd > 0) {
1676 DBG("Wait queue sanitized, %d node were cleaned up", nb_fd);
1677 }
1678
1679end:
1680 lttng_poll_clean(&events);
1681 return;
1682
1683error:
1684 lttng_poll_clean(&events);
1685error_create:
1686 ERR("Unable to sanitize wait queue");
1687 return;
1688}
1689
099e26bd
DG
1690/*
1691 * Dispatch request from the registration threads to the application
1692 * communication thread.
1693 */
1694static void *thread_dispatch_ust_registration(void *data)
1695{
12e2b881 1696 int ret, err = -1;
8bdee6e2 1697 struct cds_wfcq_node *node;
099e26bd 1698 struct ust_command *ust_cmd = NULL;
f45e313d
DG
1699 struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node;
1700 struct ust_reg_wait_queue wait_queue = {
1701 .count = 0,
1702 };
d0b96690 1703
6c71277b 1704 health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG_DISPATCH);
12e2b881 1705
9ad42ec1
MD
1706 if (testpoint(sessiond_thread_app_reg_dispatch)) {
1707 goto error_testpoint;
1708 }
1709
12e2b881
MD
1710 health_code_update();
1711
f45e313d 1712 CDS_INIT_LIST_HEAD(&wait_queue.head);
099e26bd
DG
1713
1714 DBG("[thread] Dispatch UST command started");
1715
26c9d55e 1716 while (!CMM_LOAD_SHARED(dispatch_thread_exit)) {
12e2b881
MD
1717 health_code_update();
1718
099e26bd
DG
1719 /* Atomically prepare the queue futex */
1720 futex_nto1_prepare(&ust_cmd_queue.futex);
1721
1722 do {
d0b96690 1723 struct ust_app *app = NULL;
7972aab2 1724 ust_cmd = NULL;
d0b96690 1725
f45e313d
DG
1726 /*
1727 * Make sure we don't have node(s) that have hung up before receiving
1728 * the notify socket. This is to clean the list in order to avoid
1729 * memory leaks from notify socket that are never seen.
1730 */
1731 sanitize_wait_queue(&wait_queue);
1732
12e2b881 1733 health_code_update();
099e26bd 1734 /* Dequeue command for registration */
8bdee6e2 1735 node = cds_wfcq_dequeue_blocking(&ust_cmd_queue.head, &ust_cmd_queue.tail);
099e26bd 1736 if (node == NULL) {
00a17c97 1737 DBG("Woken up but nothing in the UST command queue");
099e26bd
DG
1738 /* Continue thread execution */
1739 break;
1740 }
1741
1742 ust_cmd = caa_container_of(node, struct ust_command, node);
1743
2f50c8a3
DG
1744 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1745 " gid:%d sock:%d name:%s (version %d.%d)",
1746 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1747 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1748 ust_cmd->sock, ust_cmd->reg_msg.name,
1749 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
d0b96690
DG
1750
1751 if (ust_cmd->reg_msg.type == USTCTL_SOCKET_CMD) {
1752 wait_node = zmalloc(sizeof(*wait_node));
1753 if (!wait_node) {
1754 PERROR("zmalloc wait_node dispatch");
020d7f60
DG
1755 ret = close(ust_cmd->sock);
1756 if (ret < 0) {
1757 PERROR("close ust sock dispatch %d", ust_cmd->sock);
1758 }
51dec90d 1759 lttng_fd_put(LTTNG_FD_APPS, 1);
7972aab2 1760 free(ust_cmd);
d0b96690
DG
1761 goto error;
1762 }
1763 CDS_INIT_LIST_HEAD(&wait_node->head);
1764
1765 /* Create application object if socket is CMD. */
1766 wait_node->app = ust_app_create(&ust_cmd->reg_msg,
1767 ust_cmd->sock);
1768 if (!wait_node->app) {
1769 ret = close(ust_cmd->sock);
1770 if (ret < 0) {
1771 PERROR("close ust sock dispatch %d", ust_cmd->sock);
6620da75 1772 }
51dec90d 1773 lttng_fd_put(LTTNG_FD_APPS, 1);
d88aee68 1774 free(wait_node);
7972aab2 1775 free(ust_cmd);
d0b96690
DG
1776 continue;
1777 }
1778 /*
1779 * Add application to the wait queue so we can set the notify
1780 * socket before putting this object in the global ht.
1781 */
f45e313d
DG
1782 cds_list_add(&wait_node->head, &wait_queue.head);
1783 wait_queue.count++;
d0b96690 1784
7972aab2 1785 free(ust_cmd);
d0b96690
DG
1786 /*
1787 * We have to continue here since we don't have the notify
1788 * socket and the application MUST be added to the hash table
1789 * only at that moment.
1790 */
1791 continue;
1792 } else {
1793 /*
1794 * Look for the application in the local wait queue and set the
1795 * notify socket if found.
1796 */
d88aee68 1797 cds_list_for_each_entry_safe(wait_node, tmp_wait_node,
f45e313d 1798 &wait_queue.head, head) {
12e2b881 1799 health_code_update();
d0b96690
DG
1800 if (wait_node->app->pid == ust_cmd->reg_msg.pid) {
1801 wait_node->app->notify_sock = ust_cmd->sock;
1802 cds_list_del(&wait_node->head);
f45e313d 1803 wait_queue.count--;
d0b96690
DG
1804 app = wait_node->app;
1805 free(wait_node);
1806 DBG3("UST app notify socket %d is set", ust_cmd->sock);
1807 break;
1808 }
1809 }
020d7f60
DG
1810
1811 /*
1812 * With no application at this stage the received socket is
1813 * basically useless so close it before we free the cmd data
1814 * structure for good.
1815 */
1816 if (!app) {
1817 ret = close(ust_cmd->sock);
1818 if (ret < 0) {
1819 PERROR("close ust sock dispatch %d", ust_cmd->sock);
1820 }
51dec90d 1821 lttng_fd_put(LTTNG_FD_APPS, 1);
020d7f60 1822 }
7972aab2 1823 free(ust_cmd);
d0b96690
DG
1824 }
1825
1826 if (app) {
d0b96690
DG
1827 /*
1828 * @session_lock_list
1829 *
1830 * Lock the global session list so from the register up to the
1831 * registration done message, no thread can see the application
1832 * and change its state.
1833 */
1834 session_lock_list();
1835 rcu_read_lock();
d88aee68 1836
d0b96690
DG
1837 /*
1838 * Add application to the global hash table. This needs to be
1839 * done before the update to the UST registry can locate the
1840 * application.
1841 */
1842 ust_app_add(app);
d88aee68
DG
1843
1844 /* Set app version. This call will print an error if needed. */
1845 (void) ust_app_version(app);
1846
1847 /* Send notify socket through the notify pipe. */
1848 ret = send_socket_to_thread(apps_cmd_notify_pipe[1],
1849 app->notify_sock);
1850 if (ret < 0) {
1851 rcu_read_unlock();
1852 session_unlock_list();
b85dc84c
DG
1853 /*
1854 * No notify thread, stop the UST tracing. However, this is
1855 * not an internal error of the this thread thus setting
1856 * the health error code to a normal exit.
1857 */
1858 err = 0;
d88aee68 1859 goto error;
6620da75 1860 }
d88aee68 1861
d0b96690
DG
1862 /*
1863 * Update newly registered application with the tracing
1864 * registry info already enabled information.
1865 */
1866 update_ust_app(app->sock);
d88aee68
DG
1867
1868 /*
1869 * Don't care about return value. Let the manage apps threads
1870 * handle app unregistration upon socket close.
1871 */
1872 (void) ust_app_register_done(app->sock);
1873
1874 /*
1875 * Even if the application socket has been closed, send the app
1876 * to the thread and unregistration will take place at that
1877 * place.
1878 */
1879 ret = send_socket_to_thread(apps_cmd_pipe[1], app->sock);
d0b96690 1880 if (ret < 0) {
d88aee68
DG
1881 rcu_read_unlock();
1882 session_unlock_list();
b85dc84c
DG
1883 /*
1884 * No apps. thread, stop the UST tracing. However, this is
1885 * not an internal error of the this thread thus setting
1886 * the health error code to a normal exit.
1887 */
1888 err = 0;
d88aee68 1889 goto error;
d0b96690 1890 }
d88aee68 1891
d0b96690
DG
1892 rcu_read_unlock();
1893 session_unlock_list();
099e26bd 1894 }
099e26bd
DG
1895 } while (node != NULL);
1896
12e2b881 1897 health_poll_entry();
099e26bd
DG
1898 /* Futex wait on queue. Blocking call on futex() */
1899 futex_nto1_wait(&ust_cmd_queue.futex);
12e2b881 1900 health_poll_exit();
099e26bd 1901 }
12e2b881
MD
1902 /* Normal exit, no error */
1903 err = 0;
099e26bd
DG
1904
1905error:
d88aee68
DG
1906 /* Clean up wait queue. */
1907 cds_list_for_each_entry_safe(wait_node, tmp_wait_node,
f45e313d 1908 &wait_queue.head, head) {
d88aee68 1909 cds_list_del(&wait_node->head);
f45e313d 1910 wait_queue.count--;
d88aee68
DG
1911 free(wait_node);
1912 }
1913
9ad42ec1 1914error_testpoint:
099e26bd 1915 DBG("Dispatch thread dying");
12e2b881
MD
1916 if (err) {
1917 health_error();
1918 ERR("Health error occurred in %s", __func__);
1919 }
8782cc74 1920 health_unregister(health_sessiond);
099e26bd
DG
1921 return NULL;
1922}
1923
1924/*
1925 * This thread manage application registration.
1926 */
1927static void *thread_registration_apps(void *data)
1d4b027a 1928{
139ac872 1929 int sock = -1, i, ret, pollfd, err = -1;
5eb91c98
DG
1930 uint32_t revents, nb_fd;
1931 struct lttng_poll_event events;
099e26bd
DG
1932 /*
1933 * Get allocated in this thread, enqueued to a global queue, dequeued and
1934 * freed in the manage apps thread.
1935 */
1936 struct ust_command *ust_cmd = NULL;
1d4b027a 1937
099e26bd 1938 DBG("[thread] Manage application registration started");
1d4b027a 1939
6c71277b 1940 health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG);
927ca06a 1941
e547b070 1942 if (testpoint(sessiond_thread_registration_apps)) {
6993eeb3
CB
1943 goto error_testpoint;
1944 }
8ac94142 1945
1d4b027a
DG
1946 ret = lttcomm_listen_unix_sock(apps_sock);
1947 if (ret < 0) {
76d7553f 1948 goto error_listen;
1d4b027a
DG
1949 }
1950
5eb91c98
DG
1951 /*
1952 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1953 * more will be added to this poll set.
1954 */
d0b96690 1955 ret = sessiond_set_thread_pollset(&events, 2);
5eb91c98 1956 if (ret < 0) {
76d7553f 1957 goto error_create_poll;
5eb91c98 1958 }
273ea72c 1959
5eb91c98
DG
1960 /* Add the application registration socket */
1961 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1962 if (ret < 0) {
76d7553f 1963 goto error_poll_add;
5eb91c98 1964 }
273ea72c 1965
1d4b027a 1966 /* Notify all applications to register */
0fdd1e2c
DG
1967 ret = notify_ust_apps(1);
1968 if (ret < 0) {
1969 ERR("Failed to notify applications or create the wait shared memory.\n"
54d01ffb
DG
1970 "Execution continues but there might be problem for already\n"
1971 "running applications that wishes to register.");
0fdd1e2c 1972 }
1d4b027a
DG
1973
1974 while (1) {
1975 DBG("Accepting application registration");
273ea72c
DG
1976
1977 /* Inifinite blocking call, waiting for transmission */
88f2b785 1978 restart:
a78af745 1979 health_poll_entry();
5eb91c98 1980 ret = lttng_poll_wait(&events, -1);
a78af745 1981 health_poll_exit();
273ea72c 1982 if (ret < 0) {
88f2b785
MD
1983 /*
1984 * Restart interrupted system call.
1985 */
1986 if (errno == EINTR) {
1987 goto restart;
1988 }
273ea72c
DG
1989 goto error;
1990 }
1991
0d9c5d77
DG
1992 nb_fd = ret;
1993
5eb91c98 1994 for (i = 0; i < nb_fd; i++) {
840cb59c 1995 health_code_update();
139ac872 1996
5eb91c98
DG
1997 /* Fetch once the poll data */
1998 revents = LTTNG_POLL_GETEV(&events, i);
1999 pollfd = LTTNG_POLL_GETFD(&events, i);
273ea72c 2000
5eb91c98 2001 /* Thread quit pipe has been closed. Killing thread. */
d0b96690 2002 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
5eb91c98 2003 if (ret) {
139ac872
MD
2004 err = 0;
2005 goto exit;
90014c57 2006 }
1d4b027a 2007
5eb91c98
DG
2008 /* Event on the registration socket */
2009 if (pollfd == apps_sock) {
2010 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
2011 ERR("Register apps socket poll error");
2012 goto error;
2013 } else if (revents & LPOLLIN) {
2014 sock = lttcomm_accept_unix_sock(apps_sock);
2015 if (sock < 0) {
2016 goto error;
2017 }
099e26bd 2018
16c5c8fa
DG
2019 /*
2020 * Set socket timeout for both receiving and ending.
2021 * app_socket_timeout is in seconds, whereas
2022 * lttcomm_setsockopt_rcv_timeout and
2023 * lttcomm_setsockopt_snd_timeout expect msec as
2024 * parameter.
2025 */
2026 (void) lttcomm_setsockopt_rcv_timeout(sock,
2027 app_socket_timeout * 1000);
2028 (void) lttcomm_setsockopt_snd_timeout(sock,
2029 app_socket_timeout * 1000);
2030
b662582b
DG
2031 /*
2032 * Set the CLOEXEC flag. Return code is useless because
2033 * either way, the show must go on.
2034 */
2035 (void) utils_set_fd_cloexec(sock);
2036
5eb91c98 2037 /* Create UST registration command for enqueuing */
ba7f0ae5 2038 ust_cmd = zmalloc(sizeof(struct ust_command));
5eb91c98 2039 if (ust_cmd == NULL) {
76d7553f 2040 PERROR("ust command zmalloc");
5eb91c98
DG
2041 goto error;
2042 }
1d4b027a 2043
5eb91c98
DG
2044 /*
2045 * Using message-based transmissions to ensure we don't
2046 * have to deal with partially received messages.
2047 */
4063050c
MD
2048 ret = lttng_fd_get(LTTNG_FD_APPS, 1);
2049 if (ret < 0) {
2050 ERR("Exhausted file descriptors allowed for applications.");
2051 free(ust_cmd);
2052 ret = close(sock);
2053 if (ret) {
2054 PERROR("close");
2055 }
2056 sock = -1;
2057 continue;
2058 }
d88aee68 2059
840cb59c 2060 health_code_update();
d0b96690
DG
2061 ret = ust_app_recv_registration(sock, &ust_cmd->reg_msg);
2062 if (ret < 0) {
5eb91c98 2063 free(ust_cmd);
d0b96690 2064 /* Close socket of the application. */
76d7553f
MD
2065 ret = close(sock);
2066 if (ret) {
2067 PERROR("close");
2068 }
4063050c 2069 lttng_fd_put(LTTNG_FD_APPS, 1);
76d7553f 2070 sock = -1;
5eb91c98
DG
2071 continue;
2072 }
840cb59c 2073 health_code_update();
099e26bd 2074
5eb91c98 2075 ust_cmd->sock = sock;
34a2494f 2076 sock = -1;
099e26bd 2077
5eb91c98
DG
2078 DBG("UST registration received with pid:%d ppid:%d uid:%d"
2079 " gid:%d sock:%d name:%s (version %d.%d)",
2080 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
2081 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
2082 ust_cmd->sock, ust_cmd->reg_msg.name,
2083 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
54d01ffb 2084
5eb91c98
DG
2085 /*
2086 * Lock free enqueue the registration request. The red pill
54d01ffb 2087 * has been taken! This apps will be part of the *system*.
5eb91c98 2088 */
8bdee6e2 2089 cds_wfcq_enqueue(&ust_cmd_queue.head, &ust_cmd_queue.tail, &ust_cmd->node);
5eb91c98
DG
2090
2091 /*
2092 * Wake the registration queue futex. Implicit memory
8bdee6e2 2093 * barrier with the exchange in cds_wfcq_enqueue.
5eb91c98
DG
2094 */
2095 futex_nto1_wake(&ust_cmd_queue.futex);
2096 }
2097 }
90014c57 2098 }
1d4b027a
DG
2099 }
2100
139ac872 2101exit:
1d4b027a 2102error:
0fdd1e2c
DG
2103 /* Notify that the registration thread is gone */
2104 notify_ust_apps(0);
2105
a4b35e07 2106 if (apps_sock >= 0) {
76d7553f
MD
2107 ret = close(apps_sock);
2108 if (ret) {
2109 PERROR("close");
2110 }
a4b35e07 2111 }
46c3f085 2112 if (sock >= 0) {
76d7553f
MD
2113 ret = close(sock);
2114 if (ret) {
2115 PERROR("close");
2116 }
4063050c 2117 lttng_fd_put(LTTNG_FD_APPS, 1);
a4b35e07 2118 }
273ea72c 2119 unlink(apps_unix_sock_path);
0fdd1e2c 2120
76d7553f 2121error_poll_add:
5eb91c98 2122 lttng_poll_clean(&events);
76d7553f
MD
2123error_listen:
2124error_create_poll:
6993eeb3 2125error_testpoint:
76d7553f 2126 DBG("UST Registration thread cleanup complete");
9ad42ec1
MD
2127 if (err) {
2128 health_error();
2129 ERR("Health error occurred in %s", __func__);
2130 }
8782cc74 2131 health_unregister(health_sessiond);
5eb91c98 2132
1d4b027a
DG
2133 return NULL;
2134}
2135
8c0faa1d 2136/*
3bd1e081 2137 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
d063d709 2138 * exec or it will fails.
8c0faa1d 2139 */
3bd1e081 2140static int spawn_consumer_thread(struct consumer_data *consumer_data)
8c0faa1d 2141{
a23ec3a7 2142 int ret, clock_ret;
ee0b0061
DG
2143 struct timespec timeout;
2144
a23ec3a7
DG
2145 /* Make sure we set the readiness flag to 0 because we are NOT ready */
2146 consumer_data->consumer_thread_is_ready = 0;
8c0faa1d 2147
a23ec3a7
DG
2148 /* Setup pthread condition */
2149 ret = pthread_condattr_init(&consumer_data->condattr);
2150 if (ret != 0) {
2151 errno = ret;
2152 PERROR("pthread_condattr_init consumer data");
2153 goto error;
2154 }
2155
2156 /*
2157 * Set the monotonic clock in order to make sure we DO NOT jump in time
2158 * between the clock_gettime() call and the timedwait call. See bug #324
2159 * for a more details and how we noticed it.
2160 */
2161 ret = pthread_condattr_setclock(&consumer_data->condattr, CLOCK_MONOTONIC);
2162 if (ret != 0) {
2163 errno = ret;
2164 PERROR("pthread_condattr_setclock consumer data");
ee0b0061
DG
2165 goto error;
2166 }
8c0faa1d 2167
a23ec3a7
DG
2168 ret = pthread_cond_init(&consumer_data->cond, &consumer_data->condattr);
2169 if (ret != 0) {
2170 errno = ret;
2171 PERROR("pthread_cond_init consumer data");
2172 goto error;
2173 }
2174
2175 ret = pthread_create(&consumer_data->thread, NULL, thread_manage_consumer,
2176 consumer_data);
8c0faa1d 2177 if (ret != 0) {
3bd1e081 2178 PERROR("pthread_create consumer");
ee0b0061 2179 ret = -1;
8c0faa1d
DG
2180 goto error;
2181 }
2182
a23ec3a7
DG
2183 /* We are about to wait on a pthread condition */
2184 pthread_mutex_lock(&consumer_data->cond_mutex);
2185
ee0b0061 2186 /* Get time for sem_timedwait absolute timeout */
a23ec3a7
DG
2187 clock_ret = clock_gettime(CLOCK_MONOTONIC, &timeout);
2188 /*
2189 * Set the timeout for the condition timed wait even if the clock gettime
2190 * call fails since we might loop on that call and we want to avoid to
2191 * increment the timeout too many times.
2192 */
2193 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
2194
2195 /*
2196 * The following loop COULD be skipped in some conditions so this is why we
2197 * set ret to 0 in order to make sure at least one round of the loop is
2198 * done.
2199 */
2200 ret = 0;
2201
2202 /*
2203 * Loop until the condition is reached or when a timeout is reached. Note
2204 * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT
2205 * be returned but the pthread_cond(3), from the glibc-doc, says that it is
2206 * possible. This loop does not take any chances and works with both of
2207 * them.
2208 */
2209 while (!consumer_data->consumer_thread_is_ready && ret != ETIMEDOUT) {
2210 if (clock_ret < 0) {
2211 PERROR("clock_gettime spawn consumer");
2212 /* Infinite wait for the consumerd thread to be ready */
2213 ret = pthread_cond_wait(&consumer_data->cond,
2214 &consumer_data->cond_mutex);
2215 } else {
2216 ret = pthread_cond_timedwait(&consumer_data->cond,
2217 &consumer_data->cond_mutex, &timeout);
2218 }
ee0b0061 2219 }
8c0faa1d 2220
a23ec3a7
DG
2221 /* Release the pthread condition */
2222 pthread_mutex_unlock(&consumer_data->cond_mutex);
2223
2224 if (ret != 0) {
2225 errno = ret;
2226 if (ret == ETIMEDOUT) {
4282f9a3
DG
2227 int pth_ret;
2228
ee0b0061
DG
2229 /*
2230 * Call has timed out so we kill the kconsumerd_thread and return
2231 * an error.
2232 */
a23ec3a7
DG
2233 ERR("Condition timed out. The consumer thread was never ready."
2234 " Killing it");
4282f9a3
DG
2235 pth_ret = pthread_cancel(consumer_data->thread);
2236 if (pth_ret < 0) {
3bd1e081 2237 PERROR("pthread_cancel consumer thread");
ee0b0061
DG
2238 }
2239 } else {
a23ec3a7 2240 PERROR("pthread_cond_wait failed consumer thread");
ee0b0061 2241 }
4282f9a3
DG
2242 /* Caller is expecting a negative value on failure. */
2243 ret = -1;
ee0b0061
DG
2244 goto error;
2245 }
2246
3bd1e081
MD
2247 pthread_mutex_lock(&consumer_data->pid_mutex);
2248 if (consumer_data->pid == 0) {
a23ec3a7 2249 ERR("Consumerd did not start");
3bd1e081 2250 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556
DG
2251 goto error;
2252 }
3bd1e081 2253 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556 2254
8c0faa1d
DG
2255 return 0;
2256
2257error:
2258 return ret;
2259}
2260
d9800920 2261/*
3bd1e081 2262 * Join consumer thread
d9800920 2263 */
3bd1e081 2264static int join_consumer_thread(struct consumer_data *consumer_data)
cf3af59e
MD
2265{
2266 void *status;
cf3af59e 2267
e8209f6b
DG
2268 /* Consumer pid must be a real one. */
2269 if (consumer_data->pid > 0) {
c617c0c6 2270 int ret;
3bd1e081 2271 ret = kill(consumer_data->pid, SIGTERM);
cf3af59e 2272 if (ret) {
3bd1e081 2273 ERR("Error killing consumer daemon");
cf3af59e
MD
2274 return ret;
2275 }
3bd1e081 2276 return pthread_join(consumer_data->thread, &status);
cf3af59e
MD
2277 } else {
2278 return 0;
2279 }
2280}
2281
8c0faa1d 2282/*
3bd1e081 2283 * Fork and exec a consumer daemon (consumerd).
8c0faa1d 2284 *
d063d709 2285 * Return pid if successful else -1.
8c0faa1d 2286 */
3bd1e081 2287static pid_t spawn_consumerd(struct consumer_data *consumer_data)
8c0faa1d
DG
2288{
2289 int ret;
2290 pid_t pid;
94c55f17 2291 const char *consumer_to_use;
53086306 2292 const char *verbosity;
94c55f17 2293 struct stat st;
8c0faa1d 2294
3bd1e081 2295 DBG("Spawning consumerd");
c49dc785 2296
8c0faa1d
DG
2297 pid = fork();
2298 if (pid == 0) {
2299 /*
3bd1e081 2300 * Exec consumerd.
8c0faa1d 2301 */
daee5345 2302 if (opt_verbose_consumer) {
53086306 2303 verbosity = "--verbose";
4421f712 2304 } else if (lttng_opt_quiet) {
53086306 2305 verbosity = "--quiet";
4421f712
DG
2306 } else {
2307 verbosity = "";
53086306 2308 }
4421f712 2309
3bd1e081
MD
2310 switch (consumer_data->type) {
2311 case LTTNG_CONSUMER_KERNEL:
94c55f17 2312 /*
c7704d57
DG
2313 * Find out which consumerd to execute. We will first try the
2314 * 64-bit path, then the sessiond's installation directory, and
2315 * fallback on the 32-bit one,
94c55f17 2316 */
63a799e8
AM
2317 DBG3("Looking for a kernel consumer at these locations:");
2318 DBG3(" 1) %s", consumerd64_bin);
2319 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
2320 DBG3(" 3) %s", consumerd32_bin);
94c55f17 2321 if (stat(consumerd64_bin, &st) == 0) {
63a799e8 2322 DBG3("Found location #1");
94c55f17 2323 consumer_to_use = consumerd64_bin;
94c55f17 2324 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
63a799e8 2325 DBG3("Found location #2");
94c55f17 2326 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
eb1e0bd4 2327 } else if (stat(consumerd32_bin, &st) == 0) {
63a799e8 2328 DBG3("Found location #3");
eb1e0bd4 2329 consumer_to_use = consumerd32_bin;
94c55f17 2330 } else {
63a799e8 2331 DBG("Could not find any valid consumerd executable");
4282f9a3 2332 ret = -EINVAL;
94c55f17
AM
2333 break;
2334 }
2335 DBG("Using kernel consumer at: %s", consumer_to_use);
4282f9a3 2336 ret = execl(consumer_to_use,
94c55f17
AM
2337 "lttng-consumerd", verbosity, "-k",
2338 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
2339 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
6c71277b 2340 "--group", tracing_group_name,
94c55f17 2341 NULL);
3bd1e081 2342 break;
7753dea8
MD
2343 case LTTNG_CONSUMER64_UST:
2344 {
b1e0b6b6 2345 char *tmpnew = NULL;
8f4905da
MD
2346
2347 if (consumerd64_libdir[0] != '\0') {
2348 char *tmp;
2349 size_t tmplen;
2350
2351 tmp = getenv("LD_LIBRARY_PATH");
2352 if (!tmp) {
2353 tmp = "";
2354 }
2355 tmplen = strlen("LD_LIBRARY_PATH=")
2356 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
2357 tmpnew = zmalloc(tmplen + 1 /* \0 */);
2358 if (!tmpnew) {
2359 ret = -ENOMEM;
2360 goto error;
2361 }
2362 strcpy(tmpnew, "LD_LIBRARY_PATH=");
2363 strcat(tmpnew, consumerd64_libdir);
2364 if (tmp[0] != '\0') {
2365 strcat(tmpnew, ":");
2366 strcat(tmpnew, tmp);
2367 }
2368 ret = putenv(tmpnew);
2369 if (ret) {
2370 ret = -errno;
c6f76da9 2371 free(tmpnew);
8f4905da
MD
2372 goto error;
2373 }
2374 }
94c55f17 2375 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
a5a6aff3 2376 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD
2377 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
2378 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
6c71277b 2379 "--group", tracing_group_name,
7753dea8 2380 NULL);
8f4905da
MD
2381 if (consumerd64_libdir[0] != '\0') {
2382 free(tmpnew);
2383 }
3bd1e081 2384 break;
7753dea8
MD
2385 }
2386 case LTTNG_CONSUMER32_UST:
2387 {
937dde8e 2388 char *tmpnew = NULL;
8f4905da
MD
2389
2390 if (consumerd32_libdir[0] != '\0') {
2391 char *tmp;
2392 size_t tmplen;
2393
2394 tmp = getenv("LD_LIBRARY_PATH");
2395 if (!tmp) {
2396 tmp = "";
2397 }
2398 tmplen = strlen("LD_LIBRARY_PATH=")
2399 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
2400 tmpnew = zmalloc(tmplen + 1 /* \0 */);
2401 if (!tmpnew) {
2402 ret = -ENOMEM;
2403 goto error;
2404 }
2405 strcpy(tmpnew, "LD_LIBRARY_PATH=");
2406 strcat(tmpnew, consumerd32_libdir);
2407 if (tmp[0] != '\0') {
2408 strcat(tmpnew, ":");
2409 strcat(tmpnew, tmp);
2410 }
2411 ret = putenv(tmpnew);
2412 if (ret) {
2413 ret = -errno;
c6f76da9 2414 free(tmpnew);
8f4905da
MD
2415 goto error;
2416 }
2417 }
94c55f17 2418 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
a5a6aff3 2419 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD
2420 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
2421 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
6c71277b 2422 "--group", tracing_group_name,
7753dea8 2423 NULL);
8f4905da
MD
2424 if (consumerd32_libdir[0] != '\0') {
2425 free(tmpnew);
2426 }
7753dea8
MD
2427 break;
2428 }
3bd1e081 2429 default:
76d7553f 2430 PERROR("unknown consumer type");
3bd1e081
MD
2431 exit(EXIT_FAILURE);
2432 }
8c0faa1d 2433 if (errno != 0) {
4282f9a3 2434 PERROR("Consumer execl()");
8c0faa1d 2435 }
4282f9a3 2436 /* Reaching this point, we got a failure on our execl(). */
8c0faa1d
DG
2437 exit(EXIT_FAILURE);
2438 } else if (pid > 0) {
2439 ret = pid;
8c0faa1d 2440 } else {
76d7553f 2441 PERROR("start consumer fork");
8c0faa1d 2442 ret = -errno;
8c0faa1d 2443 }
8f4905da 2444error:
8c0faa1d
DG
2445 return ret;
2446}
2447
693bd40b 2448/*
3bd1e081 2449 * Spawn the consumerd daemon and session daemon thread.
693bd40b 2450 */
3bd1e081 2451static int start_consumerd(struct consumer_data *consumer_data)
693bd40b 2452{
c617c0c6 2453 int ret;
edb8b045
DG
2454
2455 /*
2456 * Set the listen() state on the socket since there is a possible race
2457 * between the exec() of the consumer daemon and this call if place in the
2458 * consumer thread. See bug #366 for more details.
2459 */
2460 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
2461 if (ret < 0) {
2462 goto error;
2463 }
693bd40b 2464
3bd1e081
MD
2465 pthread_mutex_lock(&consumer_data->pid_mutex);
2466 if (consumer_data->pid != 0) {
2467 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785
DG
2468 goto end;
2469 }
693bd40b 2470
3bd1e081 2471 ret = spawn_consumerd(consumer_data);
c49dc785 2472 if (ret < 0) {
3bd1e081
MD
2473 ERR("Spawning consumerd failed");
2474 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785 2475 goto error;
693bd40b 2476 }
c49dc785 2477
3bd1e081
MD
2478 /* Setting up the consumer_data pid */
2479 consumer_data->pid = ret;
48842b30 2480 DBG2("Consumer pid %d", consumer_data->pid);
3bd1e081 2481 pthread_mutex_unlock(&consumer_data->pid_mutex);
693bd40b 2482
3bd1e081
MD
2483 DBG2("Spawning consumer control thread");
2484 ret = spawn_consumer_thread(consumer_data);
693bd40b 2485 if (ret < 0) {
3bd1e081 2486 ERR("Fatal error spawning consumer control thread");
693bd40b
DG
2487 goto error;
2488 }
2489
c49dc785 2490end:
693bd40b
DG
2491 return 0;
2492
2493error:
331744e3 2494 /* Cleanup already created sockets on error. */
edb8b045 2495 if (consumer_data->err_sock >= 0) {
c617c0c6
MD
2496 int err;
2497
edb8b045
DG
2498 err = close(consumer_data->err_sock);
2499 if (err < 0) {
2500 PERROR("close consumer data error socket");
2501 }
2502 }
693bd40b
DG
2503 return ret;
2504}
2505
b73401da 2506/*
096102bd 2507 * Setup necessary data for kernel tracer action.
b73401da 2508 */
096102bd 2509static int init_kernel_tracer(void)
b73401da
DG
2510{
2511 int ret;
b73401da 2512
096102bd
DG
2513 /* Modprobe lttng kernel modules */
2514 ret = modprobe_lttng_control();
b73401da 2515 if (ret < 0) {
b73401da
DG
2516 goto error;
2517 }
2518
096102bd
DG
2519 /* Open debugfs lttng */
2520 kernel_tracer_fd = open(module_proc_lttng, O_RDWR);
2521 if (kernel_tracer_fd < 0) {
2522 DBG("Failed to open %s", module_proc_lttng);
2f77fc4b
DG
2523 ret = -1;
2524 goto error_open;
54d01ffb
DG
2525 }
2526
2f77fc4b
DG
2527 /* Validate kernel version */
2528 ret = kernel_validate_version(kernel_tracer_fd);
2529 if (ret < 0) {
2530 goto error_version;
b551a063 2531 }
54d01ffb 2532
2f77fc4b
DG
2533 ret = modprobe_lttng_data();
2534 if (ret < 0) {
2535 goto error_modules;
54d01ffb
DG
2536 }
2537
2f77fc4b
DG
2538 DBG("Kernel tracer fd %d", kernel_tracer_fd);
2539 return 0;
2540
2541error_version:
2542 modprobe_remove_lttng_control();
2543 ret = close(kernel_tracer_fd);
2544 if (ret) {
2545 PERROR("close");
b551a063 2546 }
2f77fc4b 2547 kernel_tracer_fd = -1;
f73fabfd 2548 return LTTNG_ERR_KERN_VERSION;
b551a063 2549
2f77fc4b
DG
2550error_modules:
2551 ret = close(kernel_tracer_fd);
2552 if (ret) {
2553 PERROR("close");
b551a063 2554 }
54d01ffb 2555
2f77fc4b
DG
2556error_open:
2557 modprobe_remove_lttng_control();
54d01ffb
DG
2558
2559error:
2f77fc4b
DG
2560 WARN("No kernel tracer available");
2561 kernel_tracer_fd = -1;
2562 if (!is_root) {
f73fabfd 2563 return LTTNG_ERR_NEED_ROOT_SESSIOND;
2f77fc4b 2564 } else {
f73fabfd 2565 return LTTNG_ERR_KERN_NA;
2f77fc4b 2566 }
54d01ffb
DG
2567}
2568
2f77fc4b 2569
54d01ffb 2570/*
2f77fc4b
DG
2571 * Copy consumer output from the tracing session to the domain session. The
2572 * function also applies the right modification on a per domain basis for the
2573 * trace files destination directory.
36b588ed
MD
2574 *
2575 * Should *NOT* be called with RCU read-side lock held.
54d01ffb 2576 */
2f77fc4b 2577static int copy_session_consumer(int domain, struct ltt_session *session)
54d01ffb
DG
2578{
2579 int ret;
2f77fc4b
DG
2580 const char *dir_name;
2581 struct consumer_output *consumer;
2582
2583 assert(session);
2584 assert(session->consumer);
54d01ffb 2585
b551a063
DG
2586 switch (domain) {
2587 case LTTNG_DOMAIN_KERNEL:
2f77fc4b 2588 DBG3("Copying tracing session consumer output in kernel session");
09a90bcd
DG
2589 /*
2590 * XXX: We should audit the session creation and what this function
2591 * does "extra" in order to avoid a destroy since this function is used
2592 * in the domain session creation (kernel and ust) only. Same for UST
2593 * domain.
2594 */
2595 if (session->kernel_session->consumer) {
2596 consumer_destroy_output(session->kernel_session->consumer);
2597 }
2f77fc4b
DG
2598 session->kernel_session->consumer =
2599 consumer_copy_output(session->consumer);
2600 /* Ease our life a bit for the next part */
2601 consumer = session->kernel_session->consumer;
2602 dir_name = DEFAULT_KERNEL_TRACE_DIR;
b551a063 2603 break;
f20baf8e 2604 case LTTNG_DOMAIN_JUL:
5cdb6027 2605 case LTTNG_DOMAIN_LOG4J:
0e115563 2606 case LTTNG_DOMAIN_PYTHON:
b551a063 2607 case LTTNG_DOMAIN_UST:
2f77fc4b 2608 DBG3("Copying tracing session consumer output in UST session");
09a90bcd
DG
2609 if (session->ust_session->consumer) {
2610 consumer_destroy_output(session->ust_session->consumer);
2611 }
2f77fc4b
DG
2612 session->ust_session->consumer =
2613 consumer_copy_output(session->consumer);
2614 /* Ease our life a bit for the next part */
2615 consumer = session->ust_session->consumer;
2616 dir_name = DEFAULT_UST_TRACE_DIR;
b551a063
DG
2617 break;
2618 default:
f73fabfd 2619 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
54d01ffb
DG
2620 goto error;
2621 }
2622
2f77fc4b 2623 /* Append correct directory to subdir */
c30ce0b3
CB
2624 strncat(consumer->subdir, dir_name,
2625 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
2f77fc4b
DG
2626 DBG3("Copy session consumer subdir %s", consumer->subdir);
2627
f73fabfd 2628 ret = LTTNG_OK;
54d01ffb
DG
2629
2630error:
2631 return ret;
2632}
2633
00e2e675 2634/*
2f77fc4b 2635 * Create an UST session and add it to the session ust list.
36b588ed
MD
2636 *
2637 * Should *NOT* be called with RCU read-side lock held.
00e2e675 2638 */
2f77fc4b
DG
2639static int create_ust_session(struct ltt_session *session,
2640 struct lttng_domain *domain)
00e2e675
DG
2641{
2642 int ret;
2f77fc4b 2643 struct ltt_ust_session *lus = NULL;
00e2e675 2644
a4b92340 2645 assert(session);
2f77fc4b
DG
2646 assert(domain);
2647 assert(session->consumer);
a4b92340 2648
2f77fc4b 2649 switch (domain->type) {
f20baf8e 2650 case LTTNG_DOMAIN_JUL:
5cdb6027 2651 case LTTNG_DOMAIN_LOG4J:
0e115563 2652 case LTTNG_DOMAIN_PYTHON:
2f77fc4b
DG
2653 case LTTNG_DOMAIN_UST:
2654 break;
2655 default:
2656 ERR("Unknown UST domain on create session %d", domain->type);
f73fabfd 2657 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
00e2e675
DG
2658 goto error;
2659 }
2660
2f77fc4b
DG
2661 DBG("Creating UST session");
2662
dec56f6c 2663 lus = trace_ust_create_session(session->id);
2f77fc4b 2664 if (lus == NULL) {
f73fabfd 2665 ret = LTTNG_ERR_UST_SESS_FAIL;
a4b92340
DG
2666 goto error;
2667 }
2668
2f77fc4b
DG
2669 lus->uid = session->uid;
2670 lus->gid = session->gid;
2bba9e53 2671 lus->output_traces = session->output_traces;
27babd3a 2672 lus->snapshot_mode = session->snapshot_mode;
ecc48a90 2673 lus->live_timer_interval = session->live_timer;
2f77fc4b 2674 session->ust_session = lus;
00e2e675 2675
2f77fc4b
DG
2676 /* Copy session output to the newly created UST session */
2677 ret = copy_session_consumer(domain->type, session);
f73fabfd 2678 if (ret != LTTNG_OK) {
00e2e675
DG
2679 goto error;
2680 }
2681
f73fabfd 2682 return LTTNG_OK;
00e2e675
DG
2683
2684error:
2f77fc4b
DG
2685 free(lus);
2686 session->ust_session = NULL;
00e2e675
DG
2687 return ret;
2688}
2689
2690/*
2f77fc4b 2691 * Create a kernel tracer session then create the default channel.
00e2e675 2692 */
2f77fc4b 2693static int create_kernel_session(struct ltt_session *session)
00e2e675
DG
2694{
2695 int ret;
a4b92340 2696
2f77fc4b 2697 DBG("Creating kernel session");
00e2e675 2698
2f77fc4b
DG
2699 ret = kernel_create_session(session, kernel_tracer_fd);
2700 if (ret < 0) {
f73fabfd 2701 ret = LTTNG_ERR_KERN_SESS_FAIL;
00e2e675
DG
2702 goto error;
2703 }
2704
2f77fc4b
DG
2705 /* Code flow safety */
2706 assert(session->kernel_session);
2707
2708 /* Copy session output to the newly created Kernel session */
2709 ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session);
f73fabfd 2710 if (ret != LTTNG_OK) {
a4b92340
DG
2711 goto error;
2712 }
2713
2f77fc4b
DG
2714 /* Create directory(ies) on local filesystem. */
2715 if (session->kernel_session->consumer->type == CONSUMER_DST_LOCAL &&
2716 strlen(session->kernel_session->consumer->dst.trace_path) > 0) {
2717 ret = run_as_mkdir_recursive(
2718 session->kernel_session->consumer->dst.trace_path,
2719 S_IRWXU | S_IRWXG, session->uid, session->gid);
2720 if (ret < 0) {
2721 if (ret != -EEXIST) {
2722 ERR("Trace directory creation error");
00e2e675
DG
2723 goto error;
2724 }
00e2e675 2725 }
2f77fc4b 2726 }
00e2e675 2727
2f77fc4b
DG
2728 session->kernel_session->uid = session->uid;
2729 session->kernel_session->gid = session->gid;
2bba9e53 2730 session->kernel_session->output_traces = session->output_traces;
27babd3a 2731 session->kernel_session->snapshot_mode = session->snapshot_mode;
00e2e675 2732
f73fabfd 2733 return LTTNG_OK;
00e2e675 2734
2f77fc4b
DG
2735error:
2736 trace_kernel_destroy_session(session->kernel_session);
2737 session->kernel_session = NULL;
2738 return ret;
2739}
00e2e675 2740
2f77fc4b
DG
2741/*
2742 * Count number of session permitted by uid/gid.
2743 */
2744static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
2745{
2746 unsigned int i = 0;
2747 struct ltt_session *session;
07424f16 2748
2f77fc4b
DG
2749 DBG("Counting number of available session for UID %d GID %d",
2750 uid, gid);
2751 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
00e2e675 2752 /*
2f77fc4b 2753 * Only list the sessions the user can control.
00e2e675 2754 */
2f77fc4b
DG
2755 if (!session_access_ok(session, uid, gid)) {
2756 continue;
2757 }
2758 i++;
a4b92340 2759 }
2f77fc4b 2760 return i;
00e2e675
DG
2761}
2762
54d01ffb
DG
2763/*
2764 * Process the command requested by the lttng client within the command
2765 * context structure. This function make sure that the return structure (llm)
2766 * is set and ready for transmission before returning.
2767 *
2768 * Return any error encountered or 0 for success.
53a80697
MD
2769 *
2770 * "sock" is only used for special-case var. len data.
36b588ed
MD
2771 *
2772 * Should *NOT* be called with RCU read-side lock held.
54d01ffb 2773 */
53a80697
MD
2774static int process_client_msg(struct command_ctx *cmd_ctx, int sock,
2775 int *sock_error)
54d01ffb 2776{
f73fabfd 2777 int ret = LTTNG_OK;
44d3bd01 2778 int need_tracing_session = 1;
2e09ba09 2779 int need_domain;
54d01ffb
DG
2780
2781 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
2782
53a80697
MD
2783 *sock_error = 0;
2784
2e09ba09
MD
2785 switch (cmd_ctx->lsm->cmd_type) {
2786 case LTTNG_CREATE_SESSION:
27babd3a 2787 case LTTNG_CREATE_SESSION_SNAPSHOT:
ecc48a90 2788 case LTTNG_CREATE_SESSION_LIVE:
2e09ba09
MD
2789 case LTTNG_DESTROY_SESSION:
2790 case LTTNG_LIST_SESSIONS:
2791 case LTTNG_LIST_DOMAINS:
2792 case LTTNG_START_TRACE:
2793 case LTTNG_STOP_TRACE:
6d805429 2794 case LTTNG_DATA_PENDING:
da3c9ec1
DG
2795 case LTTNG_SNAPSHOT_ADD_OUTPUT:
2796 case LTTNG_SNAPSHOT_DEL_OUTPUT:
2797 case LTTNG_SNAPSHOT_LIST_OUTPUT:
2798 case LTTNG_SNAPSHOT_RECORD:
fb198a11 2799 case LTTNG_SAVE_SESSION:
2e09ba09 2800 need_domain = 0;
3aace903 2801 break;
2e09ba09
MD
2802 default:
2803 need_domain = 1;
2804 }
2805
2806 if (opt_no_kernel && need_domain
2807 && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
531d29f9 2808 if (!is_root) {
f73fabfd 2809 ret = LTTNG_ERR_NEED_ROOT_SESSIOND;
531d29f9 2810 } else {
f73fabfd 2811 ret = LTTNG_ERR_KERN_NA;
531d29f9 2812 }
4fba7219
DG
2813 goto error;
2814 }
2815
8d3113b2
DG
2816 /* Deny register consumer if we already have a spawned consumer. */
2817 if (cmd_ctx->lsm->cmd_type == LTTNG_REGISTER_CONSUMER) {
2818 pthread_mutex_lock(&kconsumer_data.pid_mutex);
2819 if (kconsumer_data.pid > 0) {
f73fabfd 2820 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
fa317f24 2821 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
8d3113b2
DG
2822 goto error;
2823 }
2824 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
2825 }
2826
54d01ffb
DG
2827 /*
2828 * Check for command that don't needs to allocate a returned payload. We do
44d3bd01 2829 * this here so we don't have to make the call for no payload at each
54d01ffb
DG
2830 * command.
2831 */
2832 switch(cmd_ctx->lsm->cmd_type) {
2833 case LTTNG_LIST_SESSIONS:
2834 case LTTNG_LIST_TRACEPOINTS:
f37d259d 2835 case LTTNG_LIST_TRACEPOINT_FIELDS:
54d01ffb
DG
2836 case LTTNG_LIST_DOMAINS:
2837 case LTTNG_LIST_CHANNELS:
2838 case LTTNG_LIST_EVENTS:
834978fd 2839 case LTTNG_LIST_SYSCALLS:
54d01ffb
DG
2840 break;
2841 default:
2842 /* Setup lttng message with no payload */
2843 ret = setup_lttng_msg(cmd_ctx, 0);
2844 if (ret < 0) {
2845 /* This label does not try to unlock the session */
2846 goto init_setup_error;
2847 }
2848 }
2849
2850 /* Commands that DO NOT need a session. */
2851 switch (cmd_ctx->lsm->cmd_type) {
54d01ffb 2852 case LTTNG_CREATE_SESSION:
27babd3a 2853 case LTTNG_CREATE_SESSION_SNAPSHOT:
ecc48a90 2854 case LTTNG_CREATE_SESSION_LIVE:
2e09ba09 2855 case LTTNG_CALIBRATE:
54d01ffb
DG
2856 case LTTNG_LIST_SESSIONS:
2857 case LTTNG_LIST_TRACEPOINTS:
834978fd 2858 case LTTNG_LIST_SYSCALLS:
f37d259d 2859 case LTTNG_LIST_TRACEPOINT_FIELDS:
fb198a11 2860 case LTTNG_SAVE_SESSION:
44d3bd01 2861 need_tracing_session = 0;
54d01ffb
DG
2862 break;
2863 default:
2864 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
256a5576
MD
2865 /*
2866 * We keep the session list lock across _all_ commands
2867 * for now, because the per-session lock does not
2868 * handle teardown properly.
2869 */
74babd95 2870 session_lock_list();
54d01ffb
DG
2871 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
2872 if (cmd_ctx->session == NULL) {
bba2d65f 2873 ret = LTTNG_ERR_SESS_NOT_FOUND;
54d01ffb
DG
2874 goto error;
2875 } else {
2876 /* Acquire lock for the session */
2877 session_lock(cmd_ctx->session);
2878 }
2879 break;
2880 }
b389abbe 2881
5f3ecf22
DG
2882 /*
2883 * Commands that need a valid session but should NOT create one if none
2884 * exists. Instead of creating one and destroying it when the command is
2885 * handled, process that right before so we save some round trip in useless
2886 * code path.
2887 */
2888 switch (cmd_ctx->lsm->cmd_type) {
2889 case LTTNG_DISABLE_CHANNEL:
2890 case LTTNG_DISABLE_EVENT:
5f3ecf22
DG
2891 switch (cmd_ctx->lsm->domain.type) {
2892 case LTTNG_DOMAIN_KERNEL:
2893 if (!cmd_ctx->session->kernel_session) {
2894 ret = LTTNG_ERR_NO_CHANNEL;
2895 goto error;
2896 }
2897 break;
2898 case LTTNG_DOMAIN_JUL:
5cdb6027 2899 case LTTNG_DOMAIN_LOG4J:
0e115563 2900 case LTTNG_DOMAIN_PYTHON:
5f3ecf22
DG
2901 case LTTNG_DOMAIN_UST:
2902 if (!cmd_ctx->session->ust_session) {
2903 ret = LTTNG_ERR_NO_CHANNEL;
2904 goto error;
2905 }
2906 break;
2907 default:
2908 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2909 goto error;
2910 }
2911 default:
2912 break;
2913 }
2914
2e09ba09
MD
2915 if (!need_domain) {
2916 goto skip_domain;
2917 }
a4b92340 2918
54d01ffb
DG
2919 /*
2920 * Check domain type for specific "pre-action".
2921 */
2922 switch (cmd_ctx->lsm->domain.type) {
2923 case LTTNG_DOMAIN_KERNEL:
d1f1c568 2924 if (!is_root) {
f73fabfd 2925 ret = LTTNG_ERR_NEED_ROOT_SESSIOND;
d1f1c568
DG
2926 goto error;
2927 }
2928
54d01ffb 2929 /* Kernel tracer check */
a4b35e07 2930 if (kernel_tracer_fd == -1) {
54d01ffb 2931 /* Basically, load kernel tracer modules */
096102bd
DG
2932 ret = init_kernel_tracer();
2933 if (ret != 0) {
54d01ffb
DG
2934 goto error;
2935 }
2936 }
5eb91c98 2937
5c827ce0
DG
2938 /* Consumer is in an ERROR state. Report back to client */
2939 if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) {
f73fabfd 2940 ret = LTTNG_ERR_NO_KERNCONSUMERD;
5c827ce0
DG
2941 goto error;
2942 }
2943
54d01ffb 2944 /* Need a session for kernel command */
44d3bd01 2945 if (need_tracing_session) {
54d01ffb 2946 if (cmd_ctx->session->kernel_session == NULL) {
6df2e2c9 2947 ret = create_kernel_session(cmd_ctx->session);
5eb91c98 2948 if (ret < 0) {
f73fabfd 2949 ret = LTTNG_ERR_KERN_SESS_FAIL;
5eb91c98
DG
2950 goto error;
2951 }
b389abbe 2952 }
7d29a247 2953
54d01ffb 2954 /* Start the kernel consumer daemon */
3bd1e081
MD
2955 pthread_mutex_lock(&kconsumer_data.pid_mutex);
2956 if (kconsumer_data.pid == 0 &&
785d2d0d 2957 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3bd1e081
MD
2958 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
2959 ret = start_consumerd(&kconsumer_data);
7d29a247 2960 if (ret < 0) {
f73fabfd 2961 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
54d01ffb 2962 goto error;
950131af 2963 }
5c827ce0 2964 uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED);
3ff2ecac
MD
2965 } else {
2966 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
33a2b854 2967 }
173af62f 2968
a4b92340
DG
2969 /*
2970 * The consumer was just spawned so we need to add the socket to
2971 * the consumer output of the session if exist.
2972 */
2973 ret = consumer_create_socket(&kconsumer_data,
2974 cmd_ctx->session->kernel_session->consumer);
2975 if (ret < 0) {
2976 goto error;
173af62f 2977 }
0d0c377a 2978 }
5c827ce0 2979
54d01ffb 2980 break;
b9dfb167 2981 case LTTNG_DOMAIN_JUL:
5cdb6027 2982 case LTTNG_DOMAIN_LOG4J:
0e115563 2983 case LTTNG_DOMAIN_PYTHON:
2bdd86d4 2984 case LTTNG_DOMAIN_UST:
44d3bd01 2985 {
b51ec5b4
MD
2986 if (!ust_app_supported()) {
2987 ret = LTTNG_ERR_NO_UST;
2988 goto error;
2989 }
5c827ce0
DG
2990 /* Consumer is in an ERROR state. Report back to client */
2991 if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) {
f73fabfd 2992 ret = LTTNG_ERR_NO_USTCONSUMERD;
5c827ce0
DG
2993 goto error;
2994 }
2995
44d3bd01 2996 if (need_tracing_session) {
a4b92340 2997 /* Create UST session if none exist. */
f6a9efaa 2998 if (cmd_ctx->session->ust_session == NULL) {
44d3bd01 2999 ret = create_ust_session(cmd_ctx->session,
6df2e2c9 3000 &cmd_ctx->lsm->domain);
f73fabfd 3001 if (ret != LTTNG_OK) {
44d3bd01
DG
3002 goto error;
3003 }
3004 }
00e2e675 3005
7753dea8
MD
3006 /* Start the UST consumer daemons */
3007 /* 64-bit */
3008 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
fc7a59ce 3009 if (consumerd64_bin[0] != '\0' &&
7753dea8 3010 ustconsumer64_data.pid == 0 &&
785d2d0d 3011 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
7753dea8
MD
3012 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3013 ret = start_consumerd(&ustconsumer64_data);
2bdd86d4 3014 if (ret < 0) {
f73fabfd 3015 ret = LTTNG_ERR_UST_CONSUMER64_FAIL;
173af62f 3016 uatomic_set(&ust_consumerd64_fd, -EINVAL);
2bdd86d4
MD
3017 goto error;
3018 }
48842b30 3019
173af62f 3020 uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock);
5c827ce0 3021 uatomic_set(&ust_consumerd_state, CONSUMER_STARTED);
3ff2ecac 3022 } else {
7753dea8
MD
3023 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3024 }
173af62f
DG
3025
3026 /*
3027 * Setup socket for consumer 64 bit. No need for atomic access
3028 * since it was set above and can ONLY be set in this thread.
3029 */
a4b92340
DG
3030 ret = consumer_create_socket(&ustconsumer64_data,
3031 cmd_ctx->session->ust_session->consumer);
3032 if (ret < 0) {
3033 goto error;
173af62f
DG
3034 }
3035
7753dea8 3036 /* 32-bit */
385b881b 3037 pthread_mutex_lock(&ustconsumer32_data.pid_mutex);
fc7a59ce 3038 if (consumerd32_bin[0] != '\0' &&
7753dea8 3039 ustconsumer32_data.pid == 0 &&
785d2d0d 3040 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
7753dea8
MD
3041 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3042 ret = start_consumerd(&ustconsumer32_data);
3043 if (ret < 0) {
f73fabfd 3044 ret = LTTNG_ERR_UST_CONSUMER32_FAIL;
173af62f 3045 uatomic_set(&ust_consumerd32_fd, -EINVAL);
7753dea8
MD
3046 goto error;
3047 }
5c827ce0 3048
173af62f 3049 uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock);
5c827ce0 3050 uatomic_set(&ust_consumerd_state, CONSUMER_STARTED);
7753dea8
MD
3051 } else {
3052 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
2bdd86d4 3053 }
173af62f
DG
3054
3055 /*
3056 * Setup socket for consumer 64 bit. No need for atomic access
3057 * since it was set above and can ONLY be set in this thread.
3058 */
a4b92340
DG
3059 ret = consumer_create_socket(&ustconsumer32_data,
3060 cmd_ctx->session->ust_session->consumer);
3061 if (ret < 0) {
3062 goto error;
173af62f 3063 }
44d3bd01
DG
3064 }
3065 break;
48842b30 3066 }
54d01ffb 3067 default:
54d01ffb
DG
3068 break;
3069 }
2e09ba09 3070skip_domain:
33a2b854 3071
5c827ce0
DG
3072 /* Validate consumer daemon state when start/stop trace command */
3073 if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE ||
3074 cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) {
3075 switch (cmd_ctx->lsm->domain.type) {
b9dfb167 3076 case LTTNG_DOMAIN_JUL:
5cdb6027 3077 case LTTNG_DOMAIN_LOG4J:
0e115563 3078 case LTTNG_DOMAIN_PYTHON:
5c827ce0
DG
3079 case LTTNG_DOMAIN_UST:
3080 if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) {
f73fabfd 3081 ret = LTTNG_ERR_NO_USTCONSUMERD;
5c827ce0
DG
3082 goto error;
3083 }
3084 break;
3085 case LTTNG_DOMAIN_KERNEL:
3086 if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) {
f73fabfd 3087 ret = LTTNG_ERR_NO_KERNCONSUMERD;
5c827ce0
DG
3088 goto error;
3089 }
3090 break;
3091 }
3092 }
3093
8e0af1b4
MD
3094 /*
3095 * Check that the UID or GID match that of the tracing session.
3096 * The root user can interact with all sessions.
3097 */
3098 if (need_tracing_session) {
3099 if (!session_access_ok(cmd_ctx->session,
730389d9
DG
3100 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
3101 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) {
f73fabfd 3102 ret = LTTNG_ERR_EPERM;
8e0af1b4
MD
3103 goto error;
3104 }
3105 }
3106
ffe60014
DG
3107 /*
3108 * Send relayd information to consumer as soon as we have a domain and a
3109 * session defined.
3110 */
3111 if (cmd_ctx->session && need_domain) {
3112 /*
3113 * Setup relayd if not done yet. If the relayd information was already
3114 * sent to the consumer, this call will gracefully return.
3115 */
3116 ret = cmd_setup_relayd(cmd_ctx->session);
3117 if (ret != LTTNG_OK) {
3118 goto error;
3119 }
3120 }
3121
54d01ffb
DG
3122 /* Process by command type */
3123 switch (cmd_ctx->lsm->cmd_type) {
3124 case LTTNG_ADD_CONTEXT:
3125 {
3126 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3127 cmd_ctx->lsm->u.context.channel_name,
979e618e 3128 &cmd_ctx->lsm->u.context.ctx, kernel_poll_pipe[1]);
54d01ffb
DG
3129 break;
3130 }
3131 case LTTNG_DISABLE_CHANNEL:
3132 {
3133 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3134 cmd_ctx->lsm->u.disable.channel_name);
3135 break;
3136 }
3137 case LTTNG_DISABLE_EVENT:
3138 {
6e911cad
MD
3139 /* FIXME: passing packed structure to non-packed pointer */
3140 /* TODO: handle filter */
54d01ffb
DG
3141 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3142 cmd_ctx->lsm->u.disable.channel_name,
6e911cad 3143 &cmd_ctx->lsm->u.disable.event);
33a2b854
DG
3144 break;
3145 }
54d01ffb
DG
3146 case LTTNG_ENABLE_CHANNEL:
3147 {
7972aab2 3148 ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain,
2f77fc4b 3149 &cmd_ctx->lsm->u.channel.chan, kernel_poll_pipe[1]);
54d01ffb
DG
3150 break;
3151 }
3152 case LTTNG_ENABLE_EVENT:
3153 {
882ef835
JI
3154 struct lttng_event_exclusion *exclusion = NULL;
3155 struct lttng_filter_bytecode *bytecode = NULL;
6b453b5e 3156 char *filter_expression = NULL;
882ef835 3157
67676bd8
DG
3158 /* Handle exclusion events and receive it from the client. */
3159 if (cmd_ctx->lsm->u.enable.exclusion_count > 0) {
3160 size_t count = cmd_ctx->lsm->u.enable.exclusion_count;
3161
3162 exclusion = zmalloc(sizeof(struct lttng_event_exclusion) +
3163 (count * LTTNG_SYMBOL_NAME_LEN));
3164 if (!exclusion) {
3165 ret = LTTNG_ERR_EXCLUSION_NOMEM;
3166 goto error;
882ef835 3167 }
882ef835 3168
67676bd8
DG
3169 DBG("Receiving var len exclusion event list from client ...");
3170 exclusion->count = count;
3171 ret = lttcomm_recv_unix_sock(sock, exclusion->names,
3172 count * LTTNG_SYMBOL_NAME_LEN);
3173 if (ret <= 0) {
3174 DBG("Nothing recv() from client var len data... continuing");
3175 *sock_error = 1;
3176 free(exclusion);
3177 ret = LTTNG_ERR_EXCLUSION_INVAL;
3178 goto error;
3179 }
3180 }
3181
6b453b5e
JG
3182 /* Get filter expression from client. */
3183 if (cmd_ctx->lsm->u.enable.expression_len > 0) {
3184 size_t expression_len =
3185 cmd_ctx->lsm->u.enable.expression_len;
3186
3187 if (expression_len > LTTNG_FILTER_MAX_LEN) {
3188 ret = LTTNG_ERR_FILTER_INVAL;
3189 free(exclusion);
3190 goto error;
3191 }
3192
3193 filter_expression = zmalloc(expression_len);
3194 if (!filter_expression) {
3195 free(exclusion);
3196 ret = LTTNG_ERR_FILTER_NOMEM;
3197 goto error;
3198 }
3199
3200 /* Receive var. len. data */
3201 DBG("Receiving var len filter's expression from client ...");
3202 ret = lttcomm_recv_unix_sock(sock, filter_expression,
3203 expression_len);
3204 if (ret <= 0) {
3205 DBG("Nothing recv() from client car len data... continuing");
3206 *sock_error = 1;
3207 free(filter_expression);
3208 free(exclusion);
3209 ret = LTTNG_ERR_FILTER_INVAL;
3210 goto error;
3211 }
3212 }
3213
67676bd8
DG
3214 /* Handle filter and get bytecode from client. */
3215 if (cmd_ctx->lsm->u.enable.bytecode_len > 0) {
3216 size_t bytecode_len = cmd_ctx->lsm->u.enable.bytecode_len;
3217
3218 if (bytecode_len > LTTNG_FILTER_MAX_LEN) {
3219 ret = LTTNG_ERR_FILTER_INVAL;
3220 free(exclusion);
3221 goto error;
3222 }
3223
3224 bytecode = zmalloc(bytecode_len);
3225 if (!bytecode) {
3226 free(exclusion);
3227 ret = LTTNG_ERR_FILTER_NOMEM;
3228 goto error;
882ef835
JI
3229 }
3230
67676bd8
DG
3231 /* Receive var. len. data */
3232 DBG("Receiving var len filter's bytecode from client ...");
3233 ret = lttcomm_recv_unix_sock(sock, bytecode, bytecode_len);
3234 if (ret <= 0) {
3235 DBG("Nothing recv() from client car len data... continuing");
3236 *sock_error = 1;
3237 free(bytecode);
3238 free(exclusion);
3239 ret = LTTNG_ERR_FILTER_INVAL;
3240 goto error;
3241 }
3242
3243 if ((bytecode->len + sizeof(*bytecode)) != bytecode_len) {
3244 free(bytecode);
3245 free(exclusion);
3246 ret = LTTNG_ERR_FILTER_INVAL;
3247 goto error;
3248 }
882ef835 3249 }
67676bd8
DG
3250
3251 ret = cmd_enable_event(cmd_ctx->session, &cmd_ctx->lsm->domain,
3252 cmd_ctx->lsm->u.enable.channel_name,
6b453b5e
JG
3253 &cmd_ctx->lsm->u.enable.event,
3254 filter_expression, bytecode, exclusion,
67676bd8 3255 kernel_poll_pipe[1]);
54d01ffb
DG
3256 break;
3257 }
052da939 3258 case LTTNG_LIST_TRACEPOINTS:
2ef84c95 3259 {
9f19cc17 3260 struct lttng_event *events;
54d01ffb 3261 ssize_t nb_events;
052da939 3262
0845bbfa 3263 session_lock_list();
54d01ffb 3264 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
0845bbfa 3265 session_unlock_list();
54d01ffb 3266 if (nb_events < 0) {
f73fabfd 3267 /* Return value is a negative lttng_error_code. */
54d01ffb
DG
3268 ret = -nb_events;
3269 goto error;
2ef84c95
DG
3270 }
3271
3272 /*
3273 * Setup lttng message with payload size set to the event list size in
3274 * bytes and then copy list into the llm payload.
3275 */
052da939 3276 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
2ef84c95 3277 if (ret < 0) {
052da939 3278 free(events);
2ef84c95
DG
3279 goto setup_error;
3280 }
3281
3282 /* Copy event list into message payload */
9f19cc17 3283 memcpy(cmd_ctx->llm->payload, events,
052da939 3284 sizeof(struct lttng_event) * nb_events);
2ef84c95 3285
9f19cc17 3286 free(events);
2ef84c95 3287
f73fabfd 3288 ret = LTTNG_OK;
2ef84c95
DG
3289 break;
3290 }
f37d259d
MD
3291 case LTTNG_LIST_TRACEPOINT_FIELDS:
3292 {
3293 struct lttng_event_field *fields;
3294 ssize_t nb_fields;
3295
0845bbfa 3296 session_lock_list();
a4b92340
DG
3297 nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type,
3298 &fields);
0845bbfa 3299 session_unlock_list();
f37d259d 3300 if (nb_fields < 0) {
f73fabfd 3301 /* Return value is a negative lttng_error_code. */
f37d259d
MD
3302 ret = -nb_fields;
3303 goto error;
3304 }
3305
3306 /*
3307 * Setup lttng message with payload size set to the event list size in
3308 * bytes and then copy list into the llm payload.
3309 */
a4b92340
DG
3310 ret = setup_lttng_msg(cmd_ctx,
3311 sizeof(struct lttng_event_field) * nb_fields);
f37d259d
MD
3312 if (ret < 0) {
3313 free(fields);
3314 goto setup_error;
3315 }
3316
3317 /* Copy event list into message payload */
3318 memcpy(cmd_ctx->llm->payload, fields,
3319 sizeof(struct lttng_event_field) * nb_fields);
3320
3321 free(fields);
3322
f73fabfd 3323 ret = LTTNG_OK;
f37d259d
MD
3324 break;
3325 }
834978fd
DG
3326 case LTTNG_LIST_SYSCALLS:
3327 {
3328 struct lttng_event *events;
3329 ssize_t nb_events;
3330
3331 nb_events = cmd_list_syscalls(&events);
3332 if (nb_events < 0) {
3333 /* Return value is a negative lttng_error_code. */
3334 ret = -nb_events;
3335 goto error;
3336 }
3337
3338 /*
3339 * Setup lttng message with payload size set to the event list size in
3340 * bytes and then copy list into the llm payload.
3341 */
3342 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
3343 if (ret < 0) {
3344 free(events);
3345 goto setup_error;
3346 }
3347
3348 /* Copy event list into message payload */
3349 memcpy(cmd_ctx->llm->payload, events,
3350 sizeof(struct lttng_event) * nb_events);
3351
3352 free(events);
3353
3354 ret = LTTNG_OK;
3355 break;
3356 }
00e2e675
DG
3357 case LTTNG_SET_CONSUMER_URI:
3358 {
a4b92340
DG
3359 size_t nb_uri, len;
3360 struct lttng_uri *uris;
3361
3362 nb_uri = cmd_ctx->lsm->u.uri.size;
3363 len = nb_uri * sizeof(struct lttng_uri);
3364
3365 if (nb_uri == 0) {
f73fabfd 3366 ret = LTTNG_ERR_INVALID;
a4b92340
DG
3367 goto error;
3368 }
3369
3370 uris = zmalloc(len);
3371 if (uris == NULL) {
f73fabfd 3372 ret = LTTNG_ERR_FATAL;
a4b92340
DG
3373 goto error;
3374 }
3375
3376 /* Receive variable len data */
77c7c900 3377 DBG("Receiving %zu URI(s) from client ...", nb_uri);
a4b92340
DG
3378 ret = lttcomm_recv_unix_sock(sock, uris, len);
3379 if (ret <= 0) {
3380 DBG("No URIs received from client... continuing");
3381 *sock_error = 1;
f73fabfd 3382 ret = LTTNG_ERR_SESSION_FAIL;
b1d41407 3383 free(uris);
a4b92340
DG
3384 goto error;
3385 }
3386
00e2e675 3387 ret = cmd_set_consumer_uri(cmd_ctx->lsm->domain.type, cmd_ctx->session,
a4b92340 3388 nb_uri, uris);
f73fabfd 3389 if (ret != LTTNG_OK) {
b1d41407 3390 free(uris);
a4b92340
DG
3391 goto error;
3392 }
3393
3394 /*
3395 * XXX: 0 means that this URI should be applied on the session. Should
3396 * be a DOMAIN enuam.
3397 */
3398 if (cmd_ctx->lsm->domain.type == 0) {
3399 /* Add the URI for the UST session if a consumer is present. */
3400 if (cmd_ctx->session->ust_session &&
3401 cmd_ctx->session->ust_session->consumer) {
3402 ret = cmd_set_consumer_uri(LTTNG_DOMAIN_UST, cmd_ctx->session,
3403 nb_uri, uris);
3404 } else if (cmd_ctx->session->kernel_session &&
3405 cmd_ctx->session->kernel_session->consumer) {
3406 ret = cmd_set_consumer_uri(LTTNG_DOMAIN_KERNEL,
3407 cmd_ctx->session, nb_uri, uris);
3408 }
3409 }
3410
b1d41407
DG
3411 free(uris);
3412
00e2e675
DG
3413 break;
3414 }
f3ed775e 3415 case LTTNG_START_TRACE:
8c0faa1d 3416 {
54d01ffb 3417 ret = cmd_start_trace(cmd_ctx->session);
8c0faa1d
DG
3418 break;
3419 }
f3ed775e 3420 case LTTNG_STOP_TRACE:
8c0faa1d 3421 {
54d01ffb 3422 ret = cmd_stop_trace(cmd_ctx->session);
8c0faa1d
DG
3423 break;
3424 }
5e16da05
MD
3425 case LTTNG_CREATE_SESSION:
3426 {
a4b92340
DG
3427 size_t nb_uri, len;
3428 struct lttng_uri *uris = NULL;
3429
3430 nb_uri = cmd_ctx->lsm->u.uri.size;
3431 len = nb_uri * sizeof(struct lttng_uri);
3432
3433 if (nb_uri > 0) {
3434 uris = zmalloc(len);
3435 if (uris == NULL) {
f73fabfd 3436 ret = LTTNG_ERR_FATAL;
a4b92340
DG
3437 goto error;
3438 }
3439
3440 /* Receive variable len data */
77c7c900 3441 DBG("Waiting for %zu URIs from client ...", nb_uri);
a4b92340
DG
3442 ret = lttcomm_recv_unix_sock(sock, uris, len);
3443 if (ret <= 0) {
3444 DBG("No URIs received from client... continuing");
3445 *sock_error = 1;
f73fabfd 3446 ret = LTTNG_ERR_SESSION_FAIL;
b1d41407 3447 free(uris);
a4b92340
DG
3448 goto error;
3449 }
3450
3451 if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) {
3452 DBG("Creating session with ONE network URI is a bad call");
f73fabfd 3453 ret = LTTNG_ERR_SESSION_FAIL;
b1d41407 3454 free(uris);
a4b92340
DG
3455 goto error;
3456 }
3457 }
3458
3459 ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, nb_uri,
ecc48a90 3460 &cmd_ctx->creds, 0);
a4b92340 3461
b1d41407
DG
3462 free(uris);
3463
00e2e675
DG
3464 break;
3465 }
5e16da05
MD
3466 case LTTNG_DESTROY_SESSION:
3467 {
2f77fc4b 3468 ret = cmd_destroy_session(cmd_ctx->session, kernel_poll_pipe[1]);
a4b92340
DG
3469
3470 /* Set session to NULL so we do not unlock it after free. */
256a5576 3471 cmd_ctx->session = NULL;
5461b305 3472 break;
5e16da05 3473 }
9f19cc17 3474 case LTTNG_LIST_DOMAINS:
5e16da05 3475 {
54d01ffb
DG
3476 ssize_t nb_dom;
3477 struct lttng_domain *domains;
5461b305 3478
54d01ffb
DG
3479 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3480 if (nb_dom < 0) {
f73fabfd 3481 /* Return value is a negative lttng_error_code. */
54d01ffb
DG
3482 ret = -nb_dom;
3483 goto error;
ce3d728c 3484 }
520ff687 3485
54d01ffb 3486 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
5461b305 3487 if (ret < 0) {
ae9c20bc 3488 free(domains);
5461b305 3489 goto setup_error;
520ff687 3490 }
57167058 3491
54d01ffb
DG
3492 /* Copy event list into message payload */
3493 memcpy(cmd_ctx->llm->payload, domains,
3494 nb_dom * sizeof(struct lttng_domain));
3495
3496 free(domains);
5e16da05 3497
f73fabfd 3498 ret = LTTNG_OK;
5e16da05
MD
3499 break;
3500 }
9f19cc17 3501 case LTTNG_LIST_CHANNELS:
5e16da05 3502 {
6775595e 3503 int nb_chan;
54d01ffb
DG
3504 struct lttng_channel *channels;
3505
b551a063
DG
3506 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3507 cmd_ctx->session, &channels);
54d01ffb 3508 if (nb_chan < 0) {
f73fabfd 3509 /* Return value is a negative lttng_error_code. */
54d01ffb
DG
3510 ret = -nb_chan;
3511 goto error;
5461b305 3512 }
ca95a216 3513
54d01ffb 3514 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
5461b305 3515 if (ret < 0) {
ae9c20bc 3516 free(channels);
5461b305
DG
3517 goto setup_error;
3518 }
9f19cc17 3519
54d01ffb
DG
3520 /* Copy event list into message payload */
3521 memcpy(cmd_ctx->llm->payload, channels,
3522 nb_chan * sizeof(struct lttng_channel));
3523
3524 free(channels);
9f19cc17 3525
f73fabfd 3526 ret = LTTNG_OK;
5461b305 3527 break;
5e16da05 3528 }
9f19cc17 3529 case LTTNG_LIST_EVENTS:
5e16da05 3530 {
b551a063 3531 ssize_t nb_event;
684d34d2 3532 struct lttng_event *events = NULL;
9f19cc17 3533
b551a063 3534 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
54d01ffb
DG
3535 cmd_ctx->lsm->u.list.channel_name, &events);
3536 if (nb_event < 0) {
f73fabfd 3537 /* Return value is a negative lttng_error_code. */
54d01ffb
DG
3538 ret = -nb_event;
3539 goto error;
5461b305 3540 }
ca95a216 3541
54d01ffb 3542 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
5461b305 3543 if (ret < 0) {
ae9c20bc 3544 free(events);
5461b305
DG
3545 goto setup_error;
3546 }
9f19cc17 3547
54d01ffb
DG
3548 /* Copy event list into message payload */
3549 memcpy(cmd_ctx->llm->payload, events,
3550 nb_event * sizeof(struct lttng_event));
9f19cc17 3551
54d01ffb 3552 free(events);
9f19cc17 3553
f73fabfd 3554 ret = LTTNG_OK;
5461b305 3555 break;
5e16da05
MD
3556 }
3557 case LTTNG_LIST_SESSIONS:
3558 {
8e0af1b4 3559 unsigned int nr_sessions;
5461b305 3560
8e0af1b4 3561 session_lock_list();
730389d9
DG
3562 nr_sessions = lttng_sessions_count(
3563 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
3564 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
d32fb093 3565
8e0af1b4 3566 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions);
5461b305 3567 if (ret < 0) {
54d01ffb 3568 session_unlock_list();
5461b305 3569 goto setup_error;
e065084a 3570 }
5e16da05 3571
6c9cc2ab 3572 /* Filled the session array */
2f77fc4b 3573 cmd_list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload),
730389d9
DG
3574 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
3575 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
6c9cc2ab 3576
54d01ffb 3577 session_unlock_list();
5e16da05 3578
f73fabfd 3579 ret = LTTNG_OK;
5e16da05
MD
3580 break;
3581 }
d0254c7c
MD
3582 case LTTNG_CALIBRATE:
3583 {
54d01ffb
DG
3584 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3585 &cmd_ctx->lsm->u.calibrate);
d0254c7c
MD
3586 break;
3587 }
d9800920
DG
3588 case LTTNG_REGISTER_CONSUMER:
3589 {
2f77fc4b
DG
3590 struct consumer_data *cdata;
3591
3592 switch (cmd_ctx->lsm->domain.type) {
3593 case LTTNG_DOMAIN_KERNEL:
3594 cdata = &kconsumer_data;
3595 break;
3596 default:
f73fabfd 3597 ret = LTTNG_ERR_UND;
2f77fc4b
DG
3598 goto error;
3599 }
3600
54d01ffb 3601 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2f77fc4b 3602 cmd_ctx->lsm->u.reg.path, cdata);
d9800920
DG
3603 break;
3604 }
6d805429 3605 case LTTNG_DATA_PENDING:
806e2684 3606 {
6d805429 3607 ret = cmd_data_pending(cmd_ctx->session);
806e2684
DG
3608 break;
3609 }
da3c9ec1
DG
3610 case LTTNG_SNAPSHOT_ADD_OUTPUT:
3611 {
6dc3064a
DG
3612 struct lttcomm_lttng_output_id reply;
3613
3614 ret = cmd_snapshot_add_output(cmd_ctx->session,
3615 &cmd_ctx->lsm->u.snapshot_output.output, &reply.id);
3616 if (ret != LTTNG_OK) {
3617 goto error;
3618 }
3619
3620 ret = setup_lttng_msg(cmd_ctx, sizeof(reply));
3621 if (ret < 0) {
3622 goto setup_error;
3623 }
3624
3625 /* Copy output list into message payload */
3626 memcpy(cmd_ctx->llm->payload, &reply, sizeof(reply));
3627 ret = LTTNG_OK;
da3c9ec1
DG
3628 break;
3629 }
3630 case LTTNG_SNAPSHOT_DEL_OUTPUT:
3631 {
6dc3064a
DG
3632 ret = cmd_snapshot_del_output(cmd_ctx->session,
3633 &cmd_ctx->lsm->u.snapshot_output.output);
da3c9ec1
DG
3634 break;
3635 }
3636 case LTTNG_SNAPSHOT_LIST_OUTPUT:
3637 {
6dc3064a
DG
3638 ssize_t nb_output;
3639 struct lttng_snapshot_output *outputs = NULL;
3640
3641 nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs);
3642 if (nb_output < 0) {
3643 ret = -nb_output;
3644 goto error;
3645 }
3646
3647 ret = setup_lttng_msg(cmd_ctx,
3648 nb_output * sizeof(struct lttng_snapshot_output));
3649 if (ret < 0) {
3650 free(outputs);
3651 goto setup_error;
3652 }
3653
3654 if (outputs) {
3655 /* Copy output list into message payload */
3656 memcpy(cmd_ctx->llm->payload, outputs,
3657 nb_output * sizeof(struct lttng_snapshot_output));
3658 free(outputs);
3659 }
3660
3661 ret = LTTNG_OK;
da3c9ec1
DG
3662 break;
3663 }
3664 case LTTNG_SNAPSHOT_RECORD:
3665 {
6dc3064a
DG
3666 ret = cmd_snapshot_record(cmd_ctx->session,
3667 &cmd_ctx->lsm->u.snapshot_record.output,
3668 cmd_ctx->lsm->u.snapshot_record.wait);
da3c9ec1
DG
3669 break;
3670 }
27babd3a
DG
3671 case LTTNG_CREATE_SESSION_SNAPSHOT:
3672 {
3673 size_t nb_uri, len;
3674 struct lttng_uri *uris = NULL;
3675
3676 nb_uri = cmd_ctx->lsm->u.uri.size;
3677 len = nb_uri * sizeof(struct lttng_uri);
3678
3679 if (nb_uri > 0) {
3680 uris = zmalloc(len);
3681 if (uris == NULL) {
3682 ret = LTTNG_ERR_FATAL;
3683 goto error;
3684 }
3685
3686 /* Receive variable len data */
3687 DBG("Waiting for %zu URIs from client ...", nb_uri);
3688 ret = lttcomm_recv_unix_sock(sock, uris, len);
3689 if (ret <= 0) {
3690 DBG("No URIs received from client... continuing");
3691 *sock_error = 1;
3692 ret = LTTNG_ERR_SESSION_FAIL;
3693 free(uris);
3694 goto error;
3695 }
3696
3697 if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) {
3698 DBG("Creating session with ONE network URI is a bad call");
3699 ret = LTTNG_ERR_SESSION_FAIL;
3700 free(uris);
3701 goto error;
3702 }
3703 }
3704
3705 ret = cmd_create_session_snapshot(cmd_ctx->lsm->session.name, uris,
3706 nb_uri, &cmd_ctx->creds);
3707 free(uris);
3708 break;
3709 }
ecc48a90
JD
3710 case LTTNG_CREATE_SESSION_LIVE:
3711 {
3712 size_t nb_uri, len;
3713 struct lttng_uri *uris = NULL;
3714
3715 nb_uri = cmd_ctx->lsm->u.uri.size;
3716 len = nb_uri * sizeof(struct lttng_uri);
3717
3718 if (nb_uri > 0) {
3719 uris = zmalloc(len);
3720 if (uris == NULL) {
3721 ret = LTTNG_ERR_FATAL;
3722 goto error;
3723 }
3724
3725 /* Receive variable len data */
3726 DBG("Waiting for %zu URIs from client ...", nb_uri);
3727 ret = lttcomm_recv_unix_sock(sock, uris, len);
3728 if (ret <= 0) {
3729 DBG("No URIs received from client... continuing");
3730 *sock_error = 1;
3731 ret = LTTNG_ERR_SESSION_FAIL;
3732 free(uris);
3733 goto error;
3734 }
3735
3736 if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) {
3737 DBG("Creating session with ONE network URI is a bad call");
3738 ret = LTTNG_ERR_SESSION_FAIL;
3739 free(uris);
3740 goto error;
3741 }
3742 }
3743
3744 ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris,
3745 nb_uri, &cmd_ctx->creds, cmd_ctx->lsm->u.session_live.timer_interval);
3746 free(uris);
3747 break;
3748 }
fb198a11
JG
3749 case LTTNG_SAVE_SESSION:
3750 {
3751 ret = cmd_save_sessions(&cmd_ctx->lsm->u.save_session.attr,
3752 &cmd_ctx->creds);
3753 break;
3754 }
5e16da05 3755 default:
f73fabfd 3756 ret = LTTNG_ERR_UND;
5461b305 3757 break;
fac6795d
DG
3758 }
3759
5461b305 3760error:
5461b305
DG
3761 if (cmd_ctx->llm == NULL) {
3762 DBG("Missing llm structure. Allocating one.");
894be886 3763 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
5461b305
DG
3764 goto setup_error;
3765 }
3766 }
54d01ffb 3767 /* Set return code */
5461b305 3768 cmd_ctx->llm->ret_code = ret;
5461b305 3769setup_error:
b5541356 3770 if (cmd_ctx->session) {
54d01ffb 3771 session_unlock(cmd_ctx->session);
b5541356 3772 }
256a5576
MD
3773 if (need_tracing_session) {
3774 session_unlock_list();
3775 }
54d01ffb 3776init_setup_error:
8028d920 3777 return ret;
fac6795d
DG
3778}
3779
44a5e5eb
DG
3780/*
3781 * Thread managing health check socket.
3782 */
3783static void *thread_manage_health(void *data)
3784{
eb4a2943 3785 int sock = -1, new_sock = -1, ret, i, pollfd, err = -1;
44a5e5eb
DG
3786 uint32_t revents, nb_fd;
3787 struct lttng_poll_event events;
0c89d795
MD
3788 struct health_comm_msg msg;
3789 struct health_comm_reply reply;
44a5e5eb
DG
3790
3791 DBG("[thread] Manage health check started");
3792
3793 rcu_register_thread();
3794
6d737ce4
DG
3795 /* We might hit an error path before this is created. */
3796 lttng_poll_init(&events);
3cc04881 3797
44a5e5eb
DG
3798 /* Create unix socket */
3799 sock = lttcomm_create_unix_sock(health_unix_sock_path);
3800 if (sock < 0) {
3801 ERR("Unable to create health check Unix socket");
3802 ret = -1;
3803 goto error;
3804 }
3805
6c71277b
MD
3806 if (is_root) {
3807 /* lttng health client socket path permissions */
3808 ret = chown(health_unix_sock_path, 0,
3809 utils_get_group_id(tracing_group_name));
3810 if (ret < 0) {
3811 ERR("Unable to set group on %s", health_unix_sock_path);
3812 PERROR("chown");
3813 ret = -1;
3814 goto error;
3815 }
3816
3817 ret = chmod(health_unix_sock_path,
3818 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3819 if (ret < 0) {
3820 ERR("Unable to set permissions on %s", health_unix_sock_path);
3821 PERROR("chmod");
3822 ret = -1;
3823 goto error;
3824 }
3825 }
3826
b662582b
DG
3827 /*
3828 * Set the CLOEXEC flag. Return code is useless because either way, the
3829 * show must go on.
3830 */
3831 (void) utils_set_fd_cloexec(sock);
3832
44a5e5eb
DG
3833 ret = lttcomm_listen_unix_sock(sock);
3834 if (ret < 0) {
3835 goto error;
3836 }
3837
3838 /*
3839 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3840 * more will be added to this poll set.
3841 */
d0b96690 3842 ret = sessiond_set_thread_pollset(&events, 2);
44a5e5eb
DG
3843 if (ret < 0) {
3844 goto error;
3845 }
3846
3847 /* Add the application registration socket */
3848 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI);
3849 if (ret < 0) {
3850 goto error;
3851 }
3852
ef367a93 3853 sessiond_notify_ready();
97bc1426 3854
44a5e5eb
DG
3855 while (1) {
3856 DBG("Health check ready");
3857
44a5e5eb
DG
3858 /* Inifinite blocking call, waiting for transmission */
3859restart:
3860 ret = lttng_poll_wait(&events, -1);
3861 if (ret < 0) {
3862 /*
3863 * Restart interrupted system call.
3864 */
3865 if (errno == EINTR) {
3866 goto restart;
3867 }
3868 goto error;
3869 }
3870
0d9c5d77
DG
3871 nb_fd = ret;
3872
44a5e5eb
DG
3873 for (i = 0; i < nb_fd; i++) {
3874 /* Fetch once the poll data */
3875 revents = LTTNG_POLL_GETEV(&events, i);
3876 pollfd = LTTNG_POLL_GETFD(&events, i);
3877
3878 /* Thread quit pipe has been closed. Killing thread. */
d0b96690 3879 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
44a5e5eb 3880 if (ret) {
139ac872
MD
3881 err = 0;
3882 goto exit;
44a5e5eb
DG
3883 }
3884
3885 /* Event on the registration socket */
3886 if (pollfd == sock) {
3887 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3888 ERR("Health socket poll error");
3889 goto error;
3890 }
3891 }
3892 }
3893
3894 new_sock = lttcomm_accept_unix_sock(sock);
3895 if (new_sock < 0) {
3896 goto error;
3897 }
3898
b662582b
DG
3899 /*
3900 * Set the CLOEXEC flag. Return code is useless because either way, the
3901 * show must go on.
3902 */
3903 (void) utils_set_fd_cloexec(new_sock);
3904
44a5e5eb
DG
3905 DBG("Receiving data from client for health...");
3906 ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg));
3907 if (ret <= 0) {
3908 DBG("Nothing recv() from client... continuing");
3909 ret = close(new_sock);
3910 if (ret) {
3911 PERROR("close");
3912 }
3913 new_sock = -1;
3914 continue;
3915 }
3916
3917 rcu_thread_online();
3918
53efb85a 3919 memset(&reply, 0, sizeof(reply));
6c71277b
MD
3920 for (i = 0; i < NR_HEALTH_SESSIOND_TYPES; i++) {
3921 /*
3922 * health_check_state returns 0 if health is
3923 * bad.
3924 */
3925 if (!health_check_state(health_sessiond, i)) {
3926 reply.ret_code |= 1ULL << i;
3927 }
44a5e5eb
DG
3928 }
3929
6c71277b 3930 DBG2("Health check return value %" PRIx64, reply.ret_code);
44a5e5eb
DG
3931
3932 ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply));
3933 if (ret < 0) {
3934 ERR("Failed to send health data back to client");
3935 }
3936
3937 /* End of transmission */
3938 ret = close(new_sock);
3939 if (ret) {
3940 PERROR("close");
3941 }
3942 new_sock = -1;
3943 }
3944
139ac872 3945exit:
44a5e5eb 3946error:
139ac872
MD
3947 if (err) {
3948 ERR("Health error occurred in %s", __func__);
3949 }
44a5e5eb
DG
3950 DBG("Health check thread dying");
3951 unlink(health_unix_sock_path);
3952 if (sock >= 0) {
3953 ret = close(sock);
3954 if (ret) {
3955 PERROR("close");
3956 }
3957 }
44a5e5eb
DG
3958
3959 lttng_poll_clean(&events);
3960
3961 rcu_unregister_thread();
3962 return NULL;
3963}
3964
1d4b027a 3965/*
d063d709
DG
3966 * This thread manage all clients request using the unix client socket for
3967 * communication.
1d4b027a
DG
3968 */
3969static void *thread_manage_clients(void *data)
3970{
139ac872 3971 int sock = -1, ret, i, pollfd, err = -1;
53a80697 3972 int sock_error;
5eb91c98 3973 uint32_t revents, nb_fd;
273ea72c 3974 struct command_ctx *cmd_ctx = NULL;
5eb91c98 3975 struct lttng_poll_event events;
1d4b027a
DG
3976
3977 DBG("[thread] Manage client started");
3978
f6a9efaa
DG
3979 rcu_register_thread();
3980
6c71277b 3981 health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CMD);
927ca06a 3982
840cb59c 3983 health_code_update();
44a5e5eb 3984
1d4b027a
DG
3985 ret = lttcomm_listen_unix_sock(client_sock);
3986 if (ret < 0) {
35df2755 3987 goto error_listen;
1d4b027a
DG
3988 }
3989
5eb91c98
DG
3990 /*
3991 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3992 * more will be added to this poll set.
3993 */
d0b96690 3994 ret = sessiond_set_thread_pollset(&events, 2);
5eb91c98 3995 if (ret < 0) {
35df2755 3996 goto error_create_poll;
5eb91c98 3997 }
273ea72c 3998
5eb91c98
DG
3999 /* Add the application registration socket */
4000 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
4001 if (ret < 0) {
4002 goto error;
4003 }
273ea72c 4004
ef367a93
JG
4005 sessiond_notify_ready();
4006 ret = sem_post(&load_info->message_thread_ready);
4007 if (ret) {
4008 PERROR("sem_post message_thread_ready");
4009 goto error;
4010 }
0bb7724a 4011
72453c8c
MD
4012 /* This testpoint is after we signal readiness to the parent. */
4013 if (testpoint(sessiond_thread_manage_clients)) {
4014 goto error;
4015 }
4016
e547b070 4017 if (testpoint(sessiond_thread_manage_clients_before_loop)) {
6993eeb3
CB
4018 goto error;
4019 }
8ac94142 4020
840cb59c 4021 health_code_update();
44a5e5eb 4022
1d4b027a 4023 while (1) {
1d4b027a 4024 DBG("Accepting client command ...");
273ea72c
DG
4025
4026 /* Inifinite blocking call, waiting for transmission */
88f2b785 4027 restart:
a78af745 4028 health_poll_entry();
5eb91c98 4029 ret = lttng_poll_wait(&events, -1);
a78af745 4030 health_poll_exit();
273ea72c 4031 if (ret < 0) {
88f2b785
MD
4032 /*
4033 * Restart interrupted system call.
4034 */
4035 if (errno == EINTR) {
4036 goto restart;
4037 }
273ea72c
DG
4038 goto error;
4039 }
4040
0d9c5d77
DG
4041 nb_fd = ret;
4042
5eb91c98
DG
4043 for (i = 0; i < nb_fd; i++) {
4044 /* Fetch once the poll data */
4045 revents = LTTNG_POLL_GETEV(&events, i);
4046 pollfd = LTTNG_POLL_GETFD(&events, i);
4047
840cb59c 4048 health_code_update();
44a5e5eb 4049
5eb91c98 4050 /* Thread quit pipe has been closed. Killing thread. */
d0b96690 4051 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
5eb91c98 4052 if (ret) {
139ac872
MD
4053 err = 0;
4054 goto exit;
5eb91c98
DG
4055 }
4056
4057 /* Event on the registration socket */
4058 if (pollfd == client_sock) {
4059 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
4060 ERR("Client socket poll error");
4061 goto error;
4062 }
4063 }
4064 }
4065
4066 DBG("Wait for client response");
4067
840cb59c 4068 health_code_update();
44a5e5eb 4069
5eb91c98
DG
4070 sock = lttcomm_accept_unix_sock(client_sock);
4071 if (sock < 0) {
273ea72c 4072 goto error;
273ea72c
DG
4073 }
4074
b662582b
DG
4075 /*
4076 * Set the CLOEXEC flag. Return code is useless because either way, the
4077 * show must go on.
4078 */
4079 (void) utils_set_fd_cloexec(sock);
4080
be040666
DG
4081 /* Set socket option for credentials retrieval */
4082 ret = lttcomm_setsockopt_creds_unix_sock(sock);
4083 if (ret < 0) {
4084 goto error;
4085 }
4086
5eb91c98 4087 /* Allocate context command to process the client request */
ba7f0ae5 4088 cmd_ctx = zmalloc(sizeof(struct command_ctx));
5eb91c98 4089 if (cmd_ctx == NULL) {
76d7553f 4090 PERROR("zmalloc cmd_ctx");
1d4b027a 4091 goto error;
5eb91c98 4092 }
1d4b027a 4093
5eb91c98 4094 /* Allocate data buffer for reception */
ba7f0ae5 4095 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
5eb91c98 4096 if (cmd_ctx->lsm == NULL) {
76d7553f 4097 PERROR("zmalloc cmd_ctx->lsm");
5eb91c98
DG
4098 goto error;
4099 }
1d4b027a 4100
5eb91c98
DG
4101 cmd_ctx->llm = NULL;
4102 cmd_ctx->session = NULL;
1d4b027a 4103
840cb59c 4104 health_code_update();
44a5e5eb 4105
5eb91c98
DG
4106 /*
4107 * Data is received from the lttng client. The struct
4108 * lttcomm_session_msg (lsm) contains the command and data request of
4109 * the client.
4110 */
4111 DBG("Receiving data from client ...");
be040666
DG
4112 ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm,
4113 sizeof(struct lttcomm_session_msg), &cmd_ctx->creds);
5eb91c98
DG
4114 if (ret <= 0) {
4115 DBG("Nothing recv() from client... continuing");
76d7553f
MD
4116 ret = close(sock);
4117 if (ret) {
4118 PERROR("close");
4119 }
4120 sock = -1;
a2c0da86 4121 clean_command_ctx(&cmd_ctx);
5eb91c98
DG
4122 continue;
4123 }
1d4b027a 4124
840cb59c 4125 health_code_update();
44a5e5eb 4126
5eb91c98
DG
4127 // TODO: Validate cmd_ctx including sanity check for
4128 // security purpose.
f7776ea7 4129
f6a9efaa 4130 rcu_thread_online();
5eb91c98
DG
4131 /*
4132 * This function dispatch the work to the kernel or userspace tracer
4133 * libs and fill the lttcomm_lttng_msg data structure of all the needed
4134 * informations for the client. The command context struct contains
4135 * everything this function may needs.
4136 */
53a80697 4137 ret = process_client_msg(cmd_ctx, sock, &sock_error);
f6a9efaa 4138 rcu_thread_offline();
5eb91c98 4139 if (ret < 0) {
36134aa1
DG
4140 ret = close(sock);
4141 if (ret) {
4142 PERROR("close");
53a80697 4143 }
36134aa1 4144 sock = -1;
bbd973c2 4145 /*
5eb91c98 4146 * TODO: Inform client somehow of the fatal error. At
ba7f0ae5 4147 * this point, ret < 0 means that a zmalloc failed
53a80697
MD
4148 * (ENOMEM). Error detected but still accept
4149 * command, unless a socket error has been
4150 * detected.
bbd973c2 4151 */
bbd973c2 4152 clean_command_ctx(&cmd_ctx);
5eb91c98
DG
4153 continue;
4154 }
d6e4fca4 4155
840cb59c 4156 health_code_update();
44a5e5eb 4157
54d01ffb
DG
4158 DBG("Sending response (size: %d, retcode: %s)",
4159 cmd_ctx->lttng_msg_size,
9a745bc7 4160 lttng_strerror(-cmd_ctx->llm->ret_code));
54d01ffb 4161 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
5eb91c98
DG
4162 if (ret < 0) {
4163 ERR("Failed to send data back to client");
bbd973c2 4164 }
1d4b027a 4165
5eb91c98 4166 /* End of transmission */
76d7553f
MD
4167 ret = close(sock);
4168 if (ret) {
4169 PERROR("close");
4170 }
4171 sock = -1;
be040666
DG
4172
4173 clean_command_ctx(&cmd_ctx);
44a5e5eb 4174
840cb59c 4175 health_code_update();
273ea72c
DG
4176 }
4177
139ac872 4178exit:
5eb91c98 4179error:
35df2755
CB
4180 if (sock >= 0) {
4181 ret = close(sock);
4182 if (ret) {
4183 PERROR("close");
4184 }
139ac872 4185 }
44a5e5eb 4186
35df2755
CB
4187 lttng_poll_clean(&events);
4188 clean_command_ctx(&cmd_ctx);
4189
4190error_listen:
4191error_create_poll:
273ea72c 4192 unlink(client_unix_sock_path);
76d7553f
MD
4193 if (client_sock >= 0) {
4194 ret = close(client_sock);
4195 if (ret) {
4196 PERROR("close");
4197 }
a4b35e07 4198 }
35df2755
CB
4199
4200 if (err) {
840cb59c 4201 health_error();
35df2755 4202 ERR("Health error occurred in %s", __func__);
a4b35e07 4203 }
273ea72c 4204
8782cc74 4205 health_unregister(health_sessiond);
35df2755
CB
4206
4207 DBG("Client thread dying");
f6a9efaa
DG
4208
4209 rcu_unregister_thread();
1d4b027a
DG
4210 return NULL;
4211}
4212
4213
fac6795d
DG
4214/*
4215 * usage function on stderr
4216 */
4217static void usage(void)
4218{
b716ce68 4219 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
d6f42150
DG
4220 fprintf(stderr, " -h, --help Display this usage.\n");
4221 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
4222 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
4223 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
4224 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
7753dea8
MD
4225 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
4226 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
4227 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
4228 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
ebaeda94
MD
4229 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
4230 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
4231 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
4232 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
d6f42150 4233 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
72dd7491 4234 fprintf(stderr, " -b, --background Start as a daemon, keeping console open.\n");
d6f42150
DG
4235 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
4236 fprintf(stderr, " -V, --version Show version number.\n");
7fe6d2c5 4237 fprintf(stderr, " -S, --sig-parent Send SIGUSR1 to parent pid to notify readiness.\n");
d6f42150
DG
4238 fprintf(stderr, " -q, --quiet No output at all.\n");
4239 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
35f90c40 4240 fprintf(stderr, " -p, --pidfile FILE Write a pid to FILE name overriding the default value.\n");
3bd1e081 4241 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
4fba7219 4242 fprintf(stderr, " --no-kernel Disable kernel tracer\n");
1b2ef7fe 4243 fprintf(stderr, " --agent-tcp-port Agent registration TCP port\n");
26296c48 4244 fprintf(stderr, " -f --config Load daemon configuration file\n");
ef367a93 4245 fprintf(stderr, " -l --load PATH Load session configuration\n");
fbb9748b 4246 fprintf(stderr, " --kmod-probes Specify kernel module probes to load\n");
c9d42407 4247 fprintf(stderr, " --extra-kmod-probes Specify extra kernel module probes to load\n");
fac6795d
DG
4248}
4249
4250/*
26296c48
JG
4251 * Take an option from the getopt output and set it in the right variable to be
4252 * used later.
4253 *
4254 * Return 0 on success else a negative value.
fac6795d 4255 */
26296c48 4256static int set_option(int opt, const char *arg, const char *optname)
fac6795d 4257{
26296c48 4258 int ret = 0;
fac6795d 4259
26296c48
JG
4260 switch (opt) {
4261 case 0:
4262 fprintf(stderr, "option %s", optname);
4263 if (arg) {
4264 fprintf(stderr, " with arg %s\n", arg);
fac6795d 4265 }
26296c48
JG
4266 break;
4267 case 'c':
4268 snprintf(client_unix_sock_path, PATH_MAX, "%s", arg);
4269 break;
4270 case 'a':
4271 snprintf(apps_unix_sock_path, PATH_MAX, "%s", arg);
4272 break;
4273 case 'd':
4274 opt_daemon = 1;
4275 break;
72dd7491
MD
4276 case 'b':
4277 opt_background = 1;
4278 break;
26296c48 4279 case 'g':
41e16a7c
JG
4280 /*
4281 * If the override option is set, the pointer points to a
4282 * *non* const thus freeing it even though the variable type is
4283 * set to const.
4284 */
4285 if (tracing_group_name_override) {
4286 free((void *) tracing_group_name);
4287 }
26296c48 4288 tracing_group_name = strdup(arg);
db322c4d
JG
4289 if (!tracing_group_name) {
4290 perror("strdup");
4291 ret = -ENOMEM;
4292 }
41e16a7c 4293 tracing_group_name_override = 1;
26296c48
JG
4294 break;
4295 case 'h':
4296 usage();
4297 exit(EXIT_FAILURE);
4298 case 'V':
4299 fprintf(stdout, "%s\n", VERSION);
4300 exit(EXIT_SUCCESS);
4301 case 'S':
4302 opt_sig_parent = 1;
4303 break;
4304 case 'E':
4305 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", arg);
4306 break;
4307 case 'C':
4308 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", arg);
4309 break;
4310 case 'F':
4311 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", arg);
4312 break;
4313 case 'D':
4314 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", arg);
4315 break;
4316 case 'H':
4317 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", arg);
4318 break;
4319 case 'G':
4320 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", arg);
4321 break;
4322 case 'N':
4323 opt_no_kernel = 1;
4324 break;
4325 case 'q':
4326 lttng_opt_quiet = 1;
4327 break;
4328 case 'v':
4329 /* Verbose level can increase using multiple -v */
4330 if (arg) {
13755a18 4331 /* Value obtained from config file */
26296c48
JG
4332 lttng_opt_verbose = config_parse_value(arg);
4333 } else {
13755a18
JG
4334 /* -v used on command line */
4335 lttng_opt_verbose++;
26296c48 4336 }
13755a18
JG
4337 /* Clamp value to [0, 3] */
4338 lttng_opt_verbose = lttng_opt_verbose < 0 ? 0 :
4339 (lttng_opt_verbose <= 3 ? lttng_opt_verbose : 3);
26296c48
JG
4340 break;
4341 case 'Z':
4342 if (arg) {
4343 opt_verbose_consumer = config_parse_value(arg);
4344 } else {
3bd1e081 4345 opt_verbose_consumer += 1;
26296c48
JG
4346 }
4347 break;
4348 case 'u':
41e16a7c
JG
4349 if (consumerd32_bin_override) {
4350 free((void *) consumerd32_bin);
4351 }
26296c48 4352 consumerd32_bin = strdup(arg);
db322c4d
JG
4353 if (!consumerd32_bin) {
4354 perror("strdup");
4355 ret = -ENOMEM;
4356 }
26296c48
JG
4357 consumerd32_bin_override = 1;
4358 break;
4359 case 'U':
41e16a7c
JG
4360 if (consumerd32_libdir_override) {
4361 free((void *) consumerd32_libdir);
4362 }
26296c48 4363 consumerd32_libdir = strdup(arg);
db322c4d
JG
4364 if (!consumerd32_libdir) {
4365 perror("strdup");
4366 ret = -ENOMEM;
4367 }
26296c48
JG
4368 consumerd32_libdir_override = 1;
4369 break;
4370 case 't':
41e16a7c
JG
4371 if (consumerd64_bin_override) {
4372 free((void *) consumerd64_bin);
4373 }
26296c48 4374 consumerd64_bin = strdup(arg);
db322c4d
JG
4375 if (!consumerd64_bin) {
4376 perror("strdup");
4377 ret = -ENOMEM;
4378 }
26296c48
JG
4379 consumerd64_bin_override = 1;
4380 break;
4381 case 'T':
41e16a7c
JG
4382 if (consumerd64_libdir_override) {
4383 free((void *) consumerd64_libdir);
4384 }
26296c48 4385 consumerd64_libdir = strdup(arg);
db322c4d
JG
4386 if (!consumerd64_libdir) {
4387 perror("strdup");
4388 ret = -ENOMEM;
4389 }
26296c48
JG
4390 consumerd64_libdir_override = 1;
4391 break;
4392 case 'p':
41e16a7c 4393 free(opt_pidfile);
26296c48 4394 opt_pidfile = strdup(arg);
db322c4d
JG
4395 if (!opt_pidfile) {
4396 perror("strdup");
4397 ret = -ENOMEM;
4398 }
26296c48 4399 break;
022d91ba 4400 case 'J': /* Agent TCP port. */
26296c48
JG
4401 {
4402 unsigned long v;
4d076222 4403
26296c48
JG
4404 errno = 0;
4405 v = strtoul(arg, NULL, 0);
4406 if (errno != 0 || !isdigit(arg[0])) {
1b2ef7fe 4407 ERR("Wrong value in --agent-tcp-port parameter: %s", arg);
26296c48
JG
4408 return -1;
4409 }
4410 if (v == 0 || v >= 65535) {
1b2ef7fe 4411 ERR("Port overflow in --agent-tcp-port parameter: %s", arg);
26296c48
JG
4412 return -1;
4413 }
022d91ba
DG
4414 agent_tcp_port = (uint32_t) v;
4415 DBG3("Agent TCP port set to non default: %u", agent_tcp_port);
26296c48
JG
4416 break;
4417 }
ef367a93 4418 case 'l':
41e16a7c 4419 free(opt_load_session_path);
ef367a93
JG
4420 opt_load_session_path = strdup(arg);
4421 if (!opt_load_session_path) {
4422 perror("strdup");
4423 ret = -ENOMEM;
4424 }
4425 break;
fbb9748b 4426 case 'P': /* probe modules list */
41e16a7c 4427 free(kmod_probes_list);
fbb9748b 4428 kmod_probes_list = strdup(arg);
db322c4d
JG
4429 if (!kmod_probes_list) {
4430 perror("strdup");
4431 ret = -ENOMEM;
c9d42407
PP
4432 }
4433 break;
4434 case 'e':
4435 free(kmod_extra_probes_list);
4436 kmod_extra_probes_list = strdup(arg);
4437 if (!kmod_extra_probes_list) {
4438 perror("strdup");
4439 ret = -ENOMEM;
db322c4d 4440 }
fbb9748b 4441 break;
7ab02a27
DG
4442 case 'f':
4443 /* This is handled in set_options() thus silent break. */
4444 break;
26296c48
JG
4445 default:
4446 /* Unknown option or other error.
4447 * Error is printed by getopt, just return */
4448 ret = -1;
4449 }
4450
4451 return ret;
4452}
4453
4454/*
4455 * config_entry_handler_cb used to handle options read from a config file.
4456 * See config_entry_handler_cb comment in common/config/config.h for the
4457 * return value conventions.
4458 */
4459static int config_entry_handler(const struct config_entry *entry, void *unused)
4460{
4461 int ret = 0, i;
4462
4463 if (!entry || !entry->name || !entry->value) {
4464 ret = -EINVAL;
4465 goto end;
4466 }
4467
4468 /* Check if the option is to be ignored */
4469 for (i = 0; i < sizeof(config_ignore_options) / sizeof(char *); i++) {
4470 if (!strcmp(entry->name, config_ignore_options[i])) {
4471 goto end;
4472 }
4473 }
4474
4475 for (i = 0; i < (sizeof(long_options) / sizeof(struct option)) - 1;
4476 i++) {
4477
4478 /* Ignore if not fully matched. */
4479 if (strcmp(entry->name, long_options[i].name)) {
4480 continue;
4481 }
4482
4483 /*
4484 * If the option takes no argument on the command line, we have to
4485 * check if the value is "true". We support non-zero numeric values,
4486 * true, on and yes.
4487 */
4488 if (!long_options[i].has_arg) {
4489 ret = config_parse_value(entry->value);
4490 if (ret <= 0) {
4491 if (ret) {
4492 WARN("Invalid configuration value \"%s\" for option %s",
4493 entry->value, entry->name);
4494 }
4495 /* False, skip boolean config option. */
4496 goto end;
4d076222 4497 }
26296c48
JG
4498 }
4499
4500 ret = set_option(long_options[i].val, entry->value, entry->name);
4501 goto end;
4502 }
4503
4504 WARN("Unrecognized option \"%s\" in daemon configuration file.", entry->name);
4505
4506end:
4507 return ret;
4508}
4509
4510/*
4511 * daemon configuration loading and argument parsing
4512 */
4513static int set_options(int argc, char **argv)
4514{
4515 int ret = 0, c = 0, option_index = 0;
4516 int orig_optopt = optopt, orig_optind = optind;
4517 char *optstring;
4518 const char *config_path = NULL;
4519
4520 optstring = utils_generate_optstring(long_options,
4521 sizeof(long_options) / sizeof(struct option));
4522 if (!optstring) {
4523 ret = -ENOMEM;
4524 goto end;
4525 }
4526
4527 /* Check for the --config option */
4528 while ((c = getopt_long(argc, argv, optstring, long_options,
4529 &option_index)) != -1) {
4530 if (c == '?') {
4531 ret = -EINVAL;
4532 goto end;
4533 } else if (c != 'f') {
4534 /* if not equal to --config option. */
4535 continue;
4536 }
4537
4538 config_path = utils_expand_path(optarg);
4539 if (!config_path) {
4540 ERR("Failed to resolve path: %s", optarg);
4541 }
4542 }
4543
4544 ret = config_get_section_entries(config_path, config_section_name,
4545 config_entry_handler, NULL);
4546 if (ret) {
4547 if (ret > 0) {
4548 ERR("Invalid configuration option at line %i", ret);
4549 ret = -1;
4550 }
4551 goto end;
4552 }
4553
4554 /* Reset getopt's global state */
4555 optopt = orig_optopt;
4556 optind = orig_optind;
4557 while (1) {
4558 c = getopt_long(argc, argv, optstring, long_options, &option_index);
4559 if (c == -1) {
4d076222
DG
4560 break;
4561 }
26296c48
JG
4562
4563 ret = set_option(c, optarg, long_options[option_index].name);
4564 if (ret < 0) {
4565 break;
fac6795d
DG
4566 }
4567 }
4568
26296c48
JG
4569end:
4570 free(optstring);
4571 return ret;
fac6795d
DG
4572}
4573
4574/*
d063d709 4575 * Creates the two needed socket by the daemon.
d6f42150
DG
4576 * apps_sock - The communication socket for all UST apps.
4577 * client_sock - The communication of the cli tool (lttng).
fac6795d 4578 */
cf3af59e 4579static int init_daemon_socket(void)
fac6795d
DG
4580{
4581 int ret = 0;
4582 mode_t old_umask;
4583
4584 old_umask = umask(0);
4585
4586 /* Create client tool unix socket */
d6f42150
DG
4587 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
4588 if (client_sock < 0) {
4589 ERR("Create unix sock failed: %s", client_unix_sock_path);
fac6795d
DG
4590 ret = -1;
4591 goto end;
4592 }
4593
b662582b
DG
4594 /* Set the cloexec flag */
4595 ret = utils_set_fd_cloexec(client_sock);
4596 if (ret < 0) {
4597 ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). "
4598 "Continuing but note that the consumer daemon will have a "
4599 "reference to this socket on exec()", client_sock);
4600 }
4601
fac6795d
DG
4602 /* File permission MUST be 660 */
4603 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4604 if (ret < 0) {
d6f42150 4605 ERR("Set file permissions failed: %s", client_unix_sock_path);
76d7553f 4606 PERROR("chmod");
fac6795d
DG
4607 goto end;
4608 }
4609
4610 /* Create the application unix socket */
d6f42150
DG
4611 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
4612 if (apps_sock < 0) {
4613 ERR("Create unix sock failed: %s", apps_unix_sock_path);
fac6795d
DG
4614 ret = -1;
4615 goto end;
4616 }
4617
b662582b
DG
4618 /* Set the cloexec flag */
4619 ret = utils_set_fd_cloexec(apps_sock);
4620 if (ret < 0) {
4621 ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). "
4622 "Continuing but note that the consumer daemon will have a "
4623 "reference to this socket on exec()", apps_sock);
4624 }
4625
d6f42150 4626 /* File permission MUST be 666 */
54d01ffb
DG
4627 ret = chmod(apps_unix_sock_path,
4628 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
fac6795d 4629 if (ret < 0) {
d6f42150 4630 ERR("Set file permissions failed: %s", apps_unix_sock_path);
76d7553f 4631 PERROR("chmod");
fac6795d
DG
4632 goto end;
4633 }
4634
b662582b
DG
4635 DBG3("Session daemon client socket %d and application socket %d created",
4636 client_sock, apps_sock);
4637
fac6795d
DG
4638end:
4639 umask(old_umask);
4640 return ret;
4641}
4642
4643/*
54d01ffb
DG
4644 * Check if the global socket is available, and if a daemon is answering at the
4645 * other side. If yes, error is returned.
fac6795d 4646 */
cf3af59e 4647static int check_existing_daemon(void)
fac6795d 4648{
7d8234d9 4649 /* Is there anybody out there ? */
099e26bd 4650 if (lttng_session_daemon_alive()) {
7d8234d9 4651 return -EEXIST;
099e26bd 4652 }
b09c7c76
DG
4653
4654 return 0;
fac6795d
DG
4655}
4656
fac6795d 4657/*
d063d709 4658 * Set the tracing group gid onto the client socket.
5e16da05 4659 *
d063d709 4660 * Race window between mkdir and chown is OK because we are going from more
d1613cf5 4661 * permissive (root.root) to less permissive (root.tracing).
fac6795d 4662 */
be040666 4663static int set_permissions(char *rundir)
fac6795d
DG
4664{
4665 int ret;
996b65c8 4666 gid_t gid;
fac6795d 4667
6c71277b 4668 gid = utils_get_group_id(tracing_group_name);
fac6795d 4669
d6f42150 4670 /* Set lttng run dir */
be040666 4671 ret = chown(rundir, 0, gid);
d6f42150 4672 if (ret < 0) {
be040666 4673 ERR("Unable to set group on %s", rundir);
76d7553f 4674 PERROR("chown");
d6f42150
DG
4675 }
4676
6c71277b
MD
4677 /*
4678 * Ensure all applications and tracing group can search the run
4679 * dir. Allow everyone to read the directory, since it does not
4680 * buy us anything to hide its content.
4681 */
4682 ret = chmod(rundir, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH);
d1613cf5
JN
4683 if (ret < 0) {
4684 ERR("Unable to set permissions on %s", rundir);
76d7553f 4685 PERROR("chmod");
d1613cf5
JN
4686 }
4687
d6f42150 4688 /* lttng client socket path */
996b65c8 4689 ret = chown(client_unix_sock_path, 0, gid);
fac6795d 4690 if (ret < 0) {
d6f42150 4691 ERR("Unable to set group on %s", client_unix_sock_path);
76d7553f 4692 PERROR("chown");
d6f42150
DG
4693 }
4694
3bd1e081 4695 /* kconsumer error socket path */
6c71277b 4696 ret = chown(kconsumer_data.err_unix_sock_path, 0, 0);
d6f42150 4697 if (ret < 0) {
3bd1e081 4698 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
76d7553f 4699 PERROR("chown");
3bd1e081
MD
4700 }
4701
7753dea8 4702 /* 64-bit ustconsumer error socket path */
6c71277b 4703 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, 0);
7753dea8
MD
4704 if (ret < 0) {
4705 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
76d7553f 4706 PERROR("chown");
7753dea8
MD
4707 }
4708
4709 /* 32-bit ustconsumer compat32 error socket path */
6c71277b 4710 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, 0);
3bd1e081 4711 if (ret < 0) {
7753dea8 4712 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
76d7553f 4713 PERROR("chown");
fac6795d
DG
4714 }
4715
d6f42150 4716 DBG("All permissions are set");
e07ae692 4717
fac6795d
DG
4718 return ret;
4719}
4720
d6f42150 4721/*
d063d709 4722 * Create the lttng run directory needed for all global sockets and pipe.
d6f42150 4723 */
67e40797 4724static int create_lttng_rundir(const char *rundir)
d6f42150
DG
4725{
4726 int ret;
4727
67e40797
DG
4728 DBG3("Creating LTTng run directory: %s", rundir);
4729
d1613cf5 4730 ret = mkdir(rundir, S_IRWXU);
d6f42150 4731 if (ret < 0) {
b1f11e69 4732 if (errno != EEXIST) {
67e40797 4733 ERR("Unable to create %s", rundir);
b1f11e69
DG
4734 goto error;
4735 } else {
4736 ret = 0;
4737 }
d6f42150
DG
4738 }
4739
4740error:
4741 return ret;
4742}
4743
4744/*
d063d709
DG
4745 * Setup sockets and directory needed by the kconsumerd communication with the
4746 * session daemon.
d6f42150 4747 */
67e40797
DG
4748static int set_consumer_sockets(struct consumer_data *consumer_data,
4749 const char *rundir)
d6f42150
DG
4750{
4751 int ret;
67e40797 4752 char path[PATH_MAX];
d6f42150 4753
6c71277b 4754 switch (consumer_data->type) {
7753dea8 4755 case LTTNG_CONSUMER_KERNEL:
60922cb0 4756 snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir);
7753dea8
MD
4757 break;
4758 case LTTNG_CONSUMER64_UST:
60922cb0 4759 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir);
7753dea8
MD
4760 break;
4761 case LTTNG_CONSUMER32_UST:
60922cb0 4762 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir);
7753dea8
MD
4763 break;
4764 default:
4765 ERR("Consumer type unknown");
4766 ret = -EINVAL;
4767 goto error;
d6f42150
DG
4768 }
4769
67e40797
DG
4770 DBG2("Creating consumer directory: %s", path);
4771
6c71277b 4772 ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP);
d6f42150 4773 if (ret < 0) {
6beb2242 4774 if (errno != EEXIST) {
f11e84c2 4775 PERROR("mkdir");
3bd1e081 4776 ERR("Failed to create %s", path);
6beb2242
DG
4777 goto error;
4778 }
f11e84c2 4779 ret = -1;
d6f42150 4780 }
6c71277b
MD
4781 if (is_root) {
4782 ret = chown(path, 0, utils_get_group_id(tracing_group_name));
4783 if (ret < 0) {
4784 ERR("Unable to set group on %s", path);
4785 PERROR("chown");
4786 goto error;
4787 }
4788 }
d6f42150
DG
4789
4790 /* Create the kconsumerd error unix socket */
3bd1e081
MD
4791 consumer_data->err_sock =
4792 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4793 if (consumer_data->err_sock < 0) {
4794 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
d6f42150
DG
4795 ret = -1;
4796 goto error;
4797 }
4798
a24f05ab
MD
4799 /*
4800 * Set the CLOEXEC flag. Return code is useless because either way, the
4801 * show must go on.
4802 */
4803 ret = utils_set_fd_cloexec(consumer_data->err_sock);
4804 if (ret < 0) {
4805 PERROR("utils_set_fd_cloexec");
4806 /* continue anyway */
4807 }
4808
d6f42150 4809 /* File permission MUST be 660 */
3bd1e081 4810 ret = chmod(consumer_data->err_unix_sock_path,
54d01ffb 4811 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
d6f42150 4812 if (ret < 0) {
3bd1e081 4813 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
67e40797 4814 PERROR("chmod");
d6f42150
DG
4815 goto error;
4816 }
4817
4818error:
4819 return ret;
4820}
4821
fac6795d 4822/*
d063d709 4823 * Signal handler for the daemon
cf3af59e 4824 *
54d01ffb
DG
4825 * Simply stop all worker threads, leaving main() return gracefully after
4826 * joining all threads and calling cleanup().
fac6795d
DG
4827 */
4828static void sighandler(int sig)
4829{
4830 switch (sig) {
cf3af59e 4831 case SIGPIPE:
af87c45a 4832 DBG("SIGPIPE caught");
cf3af59e
MD
4833 return;
4834 case SIGINT:
af87c45a 4835 DBG("SIGINT caught");
cf3af59e
MD
4836 stop_threads();
4837 break;
4838 case SIGTERM:
af87c45a 4839 DBG("SIGTERM caught");
cf3af59e
MD
4840 stop_threads();
4841 break;
0bb7724a
DG
4842 case SIGUSR1:
4843 CMM_STORE_SHARED(recv_child_signal, 1);
4844 break;
cf3af59e
MD
4845 default:
4846 break;
fac6795d 4847 }
fac6795d
DG
4848}
4849
4850/*
d063d709 4851 * Setup signal handler for :
1d4b027a 4852 * SIGINT, SIGTERM, SIGPIPE
fac6795d 4853 */
1d4b027a 4854static int set_signal_handler(void)
fac6795d 4855{
1d4b027a
DG
4856 int ret = 0;
4857 struct sigaction sa;
4858 sigset_t sigset;
fac6795d 4859
1d4b027a 4860 if ((ret = sigemptyset(&sigset)) < 0) {
76d7553f 4861 PERROR("sigemptyset");
1d4b027a
DG
4862 return ret;
4863 }
d6f42150 4864
1d4b027a
DG
4865 sa.sa_handler = sighandler;
4866 sa.sa_mask = sigset;
4867 sa.sa_flags = 0;
4868 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
76d7553f 4869 PERROR("sigaction");
1d4b027a 4870 return ret;
d6f42150
DG
4871 }
4872
1d4b027a 4873 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
76d7553f 4874 PERROR("sigaction");
1d4b027a 4875 return ret;
d6f42150 4876 }
aaf26714 4877
1d4b027a 4878 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
76d7553f 4879 PERROR("sigaction");
1d4b027a 4880 return ret;
8c0faa1d
DG
4881 }
4882
0bb7724a
DG
4883 if ((ret = sigaction(SIGUSR1, &sa, NULL)) < 0) {
4884 PERROR("sigaction");
4885 return ret;
4886 }
4887
4888 DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT");
1d4b027a
DG
4889
4890 return ret;
fac6795d
DG
4891}
4892
f3ed775e 4893/*
d063d709
DG
4894 * Set open files limit to unlimited. This daemon can open a large number of
4895 * file descriptors in order to consumer multiple kernel traces.
f3ed775e
DG
4896 */
4897static void set_ulimit(void)
4898{
4899 int ret;
4900 struct rlimit lim;
4901
a88df331 4902 /* The kernel does not allowed an infinite limit for open files */
f3ed775e
DG
4903 lim.rlim_cur = 65535;
4904 lim.rlim_max = 65535;
4905
4906 ret = setrlimit(RLIMIT_NOFILE, &lim);
4907 if (ret < 0) {
76d7553f 4908 PERROR("failed to set open files limit");
f3ed775e
DG
4909 }
4910}
4911
35f90c40
DG
4912/*
4913 * Write pidfile using the rundir and opt_pidfile.
4914 */
4915static void write_pidfile(void)
4916{
4917 int ret;
4918 char pidfile_path[PATH_MAX];
4919
4920 assert(rundir);
4921
4922 if (opt_pidfile) {
4923 strncpy(pidfile_path, opt_pidfile, sizeof(pidfile_path));
4924 } else {
4925 /* Build pidfile path from rundir and opt_pidfile. */
4926 ret = snprintf(pidfile_path, sizeof(pidfile_path), "%s/"
4927 DEFAULT_LTTNG_SESSIOND_PIDFILE, rundir);
4928 if (ret < 0) {
4929 PERROR("snprintf pidfile path");
4930 goto error;
4931 }
4932 }
4933
4934 /*
4935 * Create pid file in rundir. Return value is of no importance. The
4936 * execution will continue even though we are not able to write the file.
4937 */
4938 (void) utils_create_pid_file(getpid(), pidfile_path);
4939
4940error:
4941 return;
4942}
4943
c9cb3e7d
JG
4944/*
4945 * Create lockfile using the rundir and return its fd.
4946 */
4947static int create_lockfile(void)
4948{
4949 int ret;
4950 char lockfile_path[PATH_MAX];
4951
4952 ret = generate_lock_file_path(lockfile_path, sizeof(lockfile_path));
4953 if (ret < 0) {
4954 goto error;
4955 }
4956
4957 ret = utils_create_lock_file(lockfile_path);
4958error:
4959 return ret;
4960}
4961
cd9290dd 4962/*
022d91ba 4963 * Write agent TCP port using the rundir.
cd9290dd 4964 */
022d91ba 4965static void write_agent_port(void)
cd9290dd
DG
4966{
4967 int ret;
4968 char path[PATH_MAX];
4969
4970 assert(rundir);
4971
4972 ret = snprintf(path, sizeof(path), "%s/"
022d91ba 4973 DEFAULT_LTTNG_SESSIOND_AGENTPORT_FILE, rundir);
cd9290dd 4974 if (ret < 0) {
022d91ba 4975 PERROR("snprintf agent port path");
cd9290dd
DG
4976 goto error;
4977 }
4978
4979 /*
022d91ba 4980 * Create TCP agent port file in rundir. Return value is of no importance.
cd9290dd
DG
4981 * The execution will continue even though we are not able to write the
4982 * file.
4983 */
022d91ba 4984 (void) utils_create_pid_file(agent_tcp_port, path);
cd9290dd
DG
4985
4986error:
4987 return;
4988}
4989
ef367a93
JG
4990/*
4991 * Start the load session thread and dettach from it so the main thread can
4992 * continue. This does not return a value since whatever the outcome, the main
4993 * thread will continue.
4994 */
4995static void start_load_session_thread(void)
4996{
4997 int ret;
4998
4999 /* Create session loading thread. */
5000 ret = pthread_create(&load_session_thread, NULL, thread_load_session,
5001 load_info);
5002 if (ret != 0) {
5003 PERROR("pthread_create load_session_thread");
5004 goto error_create;
5005 }
5006
5007 ret = pthread_detach(load_session_thread);
5008 if (ret != 0) {
5009 PERROR("pthread_detach load_session_thread");
5010 }
5011
5012 /* Everything went well so don't cleanup anything. */
5013
5014error_create:
5015 /* The cleanup() function will destroy the load_info data. */
5016 return;
5017}
5018
fac6795d
DG
5019/*
5020 * main
5021 */
5022int main(int argc, char **argv)
5023{
fac6795d
DG
5024 int ret = 0;
5025 void *status;
ae9e45b3 5026 const char *home_path, *env_app_timeout;
fac6795d 5027
335a95b7
MD
5028 init_kernel_workarounds();
5029
f6a9efaa
DG
5030 rcu_register_thread();
5031
0bb7724a
DG
5032 if ((ret = set_signal_handler()) < 0) {
5033 goto error;
5034 }
5035
7753dea8 5036 setup_consumerd_path();
fb09408a 5037
12744796
DG
5038 page_size = sysconf(_SC_PAGESIZE);
5039 if (page_size < 0) {
5040 PERROR("sysconf _SC_PAGESIZE");
5041 page_size = LONG_MAX;
5042 WARN("Fallback page size to %ld", page_size);
5043 }
5044
26296c48 5045 /* Parse arguments and load the daemon configuration file */
fac6795d 5046 progname = argv[0];
26296c48 5047 if ((ret = set_options(argc, argv)) < 0) {
cf3af59e 5048 goto error;
fac6795d
DG
5049 }
5050
5051 /* Daemonize */
72dd7491 5052 if (opt_daemon || opt_background) {
ceed52b5
MD
5053 int i;
5054
72dd7491
MD
5055 ret = lttng_daemonize(&child_ppid, &recv_child_signal,
5056 !opt_background);
53094c05 5057 if (ret < 0) {
cf3af59e 5058 goto error;
53094c05 5059 }
0bb7724a 5060
ceed52b5 5061 /*
0bb7724a
DG
5062 * We are in the child. Make sure all other file descriptors are
5063 * closed, in case we are called with more opened file descriptors than
5064 * the standard ones.
ceed52b5
MD
5065 */
5066 for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) {
5067 (void) close(i);
5068 }
5069 }
5070
5071 /* Create thread quit pipe */
5072 if ((ret = init_thread_quit_pipe()) < 0) {
5073 goto error;
fac6795d
DG
5074 }
5075
5076 /* Check if daemon is UID = 0 */
5077 is_root = !getuid();
5078
fac6795d 5079 if (is_root) {
990570ed 5080 rundir = strdup(DEFAULT_LTTNG_RUNDIR);
67e40797
DG
5081
5082 /* Create global run dir with root access */
5083 ret = create_lttng_rundir(rundir);
d6f42150 5084 if (ret < 0) {
cf3af59e 5085 goto error;
d6f42150
DG
5086 }
5087
fac6795d 5088 if (strlen(apps_unix_sock_path) == 0) {
d6f42150
DG
5089 snprintf(apps_unix_sock_path, PATH_MAX,
5090 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
fac6795d
DG
5091 }
5092
5093 if (strlen(client_unix_sock_path) == 0) {
d6f42150
DG
5094 snprintf(client_unix_sock_path, PATH_MAX,
5095 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
5096 }
0fdd1e2c
DG
5097
5098 /* Set global SHM for ust */
5099 if (strlen(wait_shm_path) == 0) {
5100 snprintf(wait_shm_path, PATH_MAX,
5101 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
5102 }
67e40797 5103
44a5e5eb
DG
5104 if (strlen(health_unix_sock_path) == 0) {
5105 snprintf(health_unix_sock_path, sizeof(health_unix_sock_path),
5106 DEFAULT_GLOBAL_HEALTH_UNIX_SOCK);
5107 }
5108
67e40797
DG
5109 /* Setup kernel consumerd path */
5110 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
60922cb0 5111 DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir);
67e40797 5112 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
60922cb0 5113 DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir);
67e40797
DG
5114
5115 DBG2("Kernel consumer err path: %s",
5116 kconsumer_data.err_unix_sock_path);
5117 DBG2("Kernel consumer cmd path: %s",
5118 kconsumer_data.cmd_unix_sock_path);
fac6795d 5119 } else {
feb0f3e5 5120 home_path = utils_get_home_dir();
b082db07 5121 if (home_path == NULL) {
273ea72c
DG
5122 /* TODO: Add --socket PATH option */
5123 ERR("Can't get HOME directory for sockets creation.");
cf3af59e
MD
5124 ret = -EPERM;
5125 goto error;
b082db07
DG
5126 }
5127
67e40797
DG
5128 /*
5129 * Create rundir from home path. This will create something like
5130 * $HOME/.lttng
5131 */
990570ed 5132 ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path);
67e40797
DG
5133 if (ret < 0) {
5134 ret = -ENOMEM;
5135 goto error;
5136 }
5137
5138 ret = create_lttng_rundir(rundir);
5139 if (ret < 0) {
5140 goto error;
5141 }
5142
fac6795d 5143 if (strlen(apps_unix_sock_path) == 0) {
d6f42150 5144 snprintf(apps_unix_sock_path, PATH_MAX,
b082db07 5145 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
fac6795d
DG
5146 }
5147
5148 /* Set the cli tool unix socket path */
5149 if (strlen(client_unix_sock_path) == 0) {
d6f42150 5150 snprintf(client_unix_sock_path, PATH_MAX,
b082db07 5151 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
fac6795d 5152 }
0fdd1e2c
DG
5153
5154 /* Set global SHM for ust */
5155 if (strlen(wait_shm_path) == 0) {
5156 snprintf(wait_shm_path, PATH_MAX,
d0b96690 5157 DEFAULT_HOME_APPS_WAIT_SHM_PATH, getuid());
0fdd1e2c 5158 }
44a5e5eb
DG
5159
5160 /* Set health check Unix path */
5161 if (strlen(health_unix_sock_path) == 0) {
5162 snprintf(health_unix_sock_path, sizeof(health_unix_sock_path),
5163 DEFAULT_HOME_HEALTH_UNIX_SOCK, home_path);
5164 }
fac6795d
DG
5165 }
5166
c9cb3e7d
JG
5167 lockfile_fd = create_lockfile();
5168 if (lockfile_fd < 0) {
5169 goto error;
5170 }
5171
5c827ce0
DG
5172 /* Set consumer initial state */
5173 kernel_consumerd_state = CONSUMER_STOPPED;
5174 ust_consumerd_state = CONSUMER_STOPPED;
5175
847177cd
DG
5176 DBG("Client socket path %s", client_unix_sock_path);
5177 DBG("Application socket path %s", apps_unix_sock_path);
d0b96690 5178 DBG("Application wait path %s", wait_shm_path);
67e40797
DG
5179 DBG("LTTng run directory path: %s", rundir);
5180
5181 /* 32 bits consumerd path setup */
5182 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
60922cb0 5183 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir);
67e40797 5184 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
60922cb0 5185 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir);
67e40797
DG
5186
5187 DBG2("UST consumer 32 bits err path: %s",
5188 ustconsumer32_data.err_unix_sock_path);
5189 DBG2("UST consumer 32 bits cmd path: %s",
5190 ustconsumer32_data.cmd_unix_sock_path);
5191
5192 /* 64 bits consumerd path setup */
5193 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
60922cb0 5194 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir);
67e40797 5195 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
60922cb0 5196 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir);
67e40797
DG
5197
5198 DBG2("UST consumer 64 bits err path: %s",
5199 ustconsumer64_data.err_unix_sock_path);
5200 DBG2("UST consumer 64 bits cmd path: %s",
5201 ustconsumer64_data.cmd_unix_sock_path);
847177cd 5202
273ea72c 5203 /*
7d8234d9 5204 * See if daemon already exist.
fac6795d 5205 */
7d8234d9 5206 if ((ret = check_existing_daemon()) < 0) {
75462a81 5207 ERR("Already running daemon.\n");
273ea72c 5208 /*
cf3af59e
MD
5209 * We do not goto exit because we must not cleanup()
5210 * because a daemon is already running.
ab118b20 5211 */
cf3af59e 5212 goto error;
a88df331
DG
5213 }
5214
1427f9b2
DG
5215 /*
5216 * Init UST app hash table. Alloc hash table before this point since
5217 * cleanup() can get called after that point.
5218 */
5219 ust_app_ht_alloc();
5220
022d91ba
DG
5221 /* Initialize agent domain subsystem. */
5222 if ((ret = agent_setup()) < 0) {
f20baf8e
DG
5223 /* ENOMEM at this point. */
5224 goto error;
5225 }
5226
54d01ffb 5227 /* After this point, we can safely call cleanup() with "goto exit" */
a88df331
DG
5228
5229 /*
5230 * These actions must be executed as root. We do that *after* setting up
5231 * the sockets path because we MUST make the check for another daemon using
5232 * those paths *before* trying to set the kernel consumer sockets and init
5233 * kernel tracer.
5234 */
5235 if (is_root) {
67e40797 5236 ret = set_consumer_sockets(&kconsumer_data, rundir);
7753dea8
MD
5237 if (ret < 0) {
5238 goto exit;
5239 }
5240
a88df331 5241 /* Setup kernel tracer */
4fba7219
DG
5242 if (!opt_no_kernel) {
5243 init_kernel_tracer();
89588270
DG
5244 if (kernel_tracer_fd >= 0) {
5245 ret = syscall_init_table();
5246 if (ret < 0) {
5247 ERR("Unable to populate syscall table. Syscall tracing"
5248 " won't work for this session daemon.");
5249 }
834978fd 5250 }
4fba7219 5251 }
a88df331
DG
5252
5253 /* Set ulimit for open files */
5254 set_ulimit();
fac6795d 5255 }
4063050c
MD
5256 /* init lttng_fd tracking must be done after set_ulimit. */
5257 lttng_fd_init();
fac6795d 5258
67e40797
DG
5259 ret = set_consumer_sockets(&ustconsumer64_data, rundir);
5260 if (ret < 0) {
5261 goto exit;
5262 }
5263
5264 ret = set_consumer_sockets(&ustconsumer32_data, rundir);
5265 if (ret < 0) {
5266 goto exit;
5267 }
5268
d6f42150 5269 /* Setup the needed unix socket */
cf3af59e
MD
5270 if ((ret = init_daemon_socket()) < 0) {
5271 goto exit;
fac6795d
DG
5272 }
5273
5274 /* Set credentials to socket */
be040666 5275 if (is_root && ((ret = set_permissions(rundir)) < 0)) {
cf3af59e 5276 goto exit;
fac6795d
DG
5277 }
5278
5b8719f5
DG
5279 /* Get parent pid if -S, --sig-parent is specified. */
5280 if (opt_sig_parent) {
5281 ppid = getppid();
5282 }
5283
7a485870 5284 /* Setup the kernel pipe for waking up the kernel thread */
6620da75
DG
5285 if (is_root && !opt_no_kernel) {
5286 if ((ret = utils_create_pipe_cloexec(kernel_poll_pipe)) < 0) {
5287 goto exit;
5288 }
7a485870
DG
5289 }
5290
0b2dc8df
MD
5291 /* Setup the thread ht_cleanup communication pipe. */
5292 if (utils_create_pipe_cloexec(ht_cleanup_pipe) < 0) {
5293 goto exit;
5294 }
5295
099e26bd 5296 /* Setup the thread apps communication pipe. */
ef599319 5297 if ((ret = utils_create_pipe_cloexec(apps_cmd_pipe)) < 0) {
099e26bd
DG
5298 goto exit;
5299 }
5300
d0b96690
DG
5301 /* Setup the thread apps notify communication pipe. */
5302 if (utils_create_pipe_cloexec(apps_cmd_notify_pipe) < 0) {
5303 goto exit;
5304 }
5305
7972aab2
DG
5306 /* Initialize global buffer per UID and PID registry. */
5307 buffer_reg_init_uid_registry();
5308 buffer_reg_init_pid_registry();
5309
099e26bd 5310 /* Init UST command queue. */
8bdee6e2 5311 cds_wfcq_init(&ust_cmd_queue.head, &ust_cmd_queue.tail);
099e26bd 5312
273ea72c 5313 /*
54d01ffb
DG
5314 * Get session list pointer. This pointer MUST NOT be free(). This list is
5315 * statically declared in session.c
273ea72c 5316 */
54d01ffb 5317 session_list_ptr = session_get_list();
b5541356 5318
5eb91c98
DG
5319 /* Set up max poll set size */
5320 lttng_poll_set_max_size();
5321
2f77fc4b 5322 cmd_init();
00e2e675 5323
ae9e45b3
DG
5324 /* Check for the application socket timeout env variable. */
5325 env_app_timeout = getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV);
5326 if (env_app_timeout) {
5327 app_socket_timeout = atoi(env_app_timeout);
5328 } else {
5329 app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT;
5330 }
5331
35f90c40 5332 write_pidfile();
022d91ba 5333 write_agent_port();
35f90c40 5334
554831e7
MD
5335 /* Initialize communication library */
5336 lttcomm_init();
d831c249
DG
5337 /* This is to get the TCP timeout value. */
5338 lttcomm_inet_init();
554831e7 5339
ef367a93
JG
5340 if (load_session_init_data(&load_info) < 0) {
5341 goto exit;
5342 }
5343 load_info->path = opt_load_session_path;
5344
67e05644
DG
5345 /*
5346 * Initialize the health check subsystem. This call should set the
5347 * appropriate time values.
5348 */
6c71277b 5349 health_sessiond = health_app_create(NR_HEALTH_SESSIOND_TYPES);
8782cc74
MD
5350 if (!health_sessiond) {
5351 PERROR("health_app_create error");
5352 goto exit_health_sessiond_cleanup;
5353 }
67e05644 5354
d5b9fd2f 5355 /* Create thread to clean up RCU hash tables */
0b2dc8df
MD
5356 ret = pthread_create(&ht_cleanup_thread, NULL,
5357 thread_ht_cleanup, (void *) NULL);
5358 if (ret != 0) {
5359 PERROR("pthread_create ht_cleanup");
5360 goto exit_ht_cleanup;
5361 }
5362
d5b9fd2f 5363 /* Create health-check thread */
44a5e5eb
DG
5364 ret = pthread_create(&health_thread, NULL,
5365 thread_manage_health, (void *) NULL);
5366 if (ret != 0) {
5367 PERROR("pthread_create health");
5368 goto exit_health;
5369 }
5370
cf3af59e 5371 /* Create thread to manage the client socket */
099e26bd
DG
5372 ret = pthread_create(&client_thread, NULL,
5373 thread_manage_clients, (void *) NULL);
cf3af59e 5374 if (ret != 0) {
76d7553f 5375 PERROR("pthread_create clients");
cf3af59e
MD
5376 goto exit_client;
5377 }
fac6795d 5378
099e26bd
DG
5379 /* Create thread to dispatch registration */
5380 ret = pthread_create(&dispatch_thread, NULL,
5381 thread_dispatch_ust_registration, (void *) NULL);
5382 if (ret != 0) {
76d7553f 5383 PERROR("pthread_create dispatch");
099e26bd
DG
5384 goto exit_dispatch;
5385 }
5386
5387 /* Create thread to manage application registration. */
5388 ret = pthread_create(&reg_apps_thread, NULL,
5389 thread_registration_apps, (void *) NULL);
5390 if (ret != 0) {
76d7553f 5391 PERROR("pthread_create registration");
099e26bd
DG
5392 goto exit_reg_apps;
5393 }
5394
cf3af59e 5395 /* Create thread to manage application socket */
54d01ffb
DG
5396 ret = pthread_create(&apps_thread, NULL,
5397 thread_manage_apps, (void *) NULL);
cf3af59e 5398 if (ret != 0) {
d0b96690
DG
5399 PERROR("pthread_create apps");
5400 goto exit_apps;
5401 }
5402
5403 /* Create thread to manage application notify socket */
5404 ret = pthread_create(&apps_notify_thread, NULL,
5405 ust_thread_manage_notify, (void *) NULL);
5406 if (ret != 0) {
f5c32ef1 5407 PERROR("pthread_create notify");
9563b0ad 5408 goto exit_apps_notify;
cf3af59e 5409 }
fac6795d 5410
022d91ba
DG
5411 /* Create agent registration thread. */
5412 ret = pthread_create(&agent_reg_thread, NULL,
5413 agent_thread_manage_registration, (void *) NULL);
4d076222 5414 if (ret != 0) {
022d91ba
DG
5415 PERROR("pthread_create agent");
5416 goto exit_agent_reg;
4d076222
DG
5417 }
5418
6620da75
DG
5419 /* Don't start this thread if kernel tracing is not requested nor root */
5420 if (is_root && !opt_no_kernel) {
5421 /* Create kernel thread to manage kernel event */
5422 ret = pthread_create(&kernel_thread, NULL,
5423 thread_manage_kernel, (void *) NULL);
5424 if (ret != 0) {
5425 PERROR("pthread_create kernel");
5426 goto exit_kernel;
5427 }
ef367a93 5428 }
7a485870 5429
ef367a93
JG
5430 /* Load possible session(s). */
5431 start_load_session_thread();
5432
5433 if (is_root && !opt_no_kernel) {
6620da75
DG
5434 ret = pthread_join(kernel_thread, &status);
5435 if (ret != 0) {
5436 PERROR("pthread_join");
5437 goto error; /* join error, exit without cleanup */
5438 }
fac6795d
DG
5439 }
5440
cf3af59e 5441exit_kernel:
022d91ba 5442 ret = pthread_join(agent_reg_thread, &status);
4d076222 5443 if (ret != 0) {
022d91ba 5444 PERROR("pthread_join agent");
4d076222
DG
5445 goto error; /* join error, exit without cleanup */
5446 }
5447
022d91ba 5448exit_agent_reg:
9563b0ad
DG
5449 ret = pthread_join(apps_notify_thread, &status);
5450 if (ret != 0) {
5451 PERROR("pthread_join apps notify");
5452 goto error; /* join error, exit without cleanup */
5453 }
5454
5455exit_apps_notify:
cf3af59e
MD
5456 ret = pthread_join(apps_thread, &status);
5457 if (ret != 0) {
9563b0ad 5458 PERROR("pthread_join apps");
cf3af59e
MD
5459 goto error; /* join error, exit without cleanup */
5460 }
fac6795d 5461
4ccd8c8f 5462
cf3af59e 5463exit_apps:
099e26bd
DG
5464 ret = pthread_join(reg_apps_thread, &status);
5465 if (ret != 0) {
76d7553f 5466 PERROR("pthread_join");
099e26bd
DG
5467 goto error; /* join error, exit without cleanup */
5468 }
5469
5470exit_reg_apps:
5471 ret = pthread_join(dispatch_thread, &status);
5472 if (ret != 0) {
76d7553f 5473 PERROR("pthread_join");
099e26bd
DG
5474 goto error; /* join error, exit without cleanup */
5475 }
5476
5477exit_dispatch:
cf3af59e
MD
5478 ret = pthread_join(client_thread, &status);
5479 if (ret != 0) {
76d7553f 5480 PERROR("pthread_join");
cf3af59e
MD
5481 goto error; /* join error, exit without cleanup */
5482 }
5483
3bd1e081 5484 ret = join_consumer_thread(&kconsumer_data);
cf3af59e 5485 if (ret != 0) {
76d7553f 5486 PERROR("join_consumer");
cf3af59e
MD
5487 goto error; /* join error, exit without cleanup */
5488 }
a88df331 5489
06f525de
DG
5490 ret = join_consumer_thread(&ustconsumer32_data);
5491 if (ret != 0) {
5492 PERROR("join_consumer ust32");
5493 goto error; /* join error, exit without cleanup */
5494 }
5495
5496 ret = join_consumer_thread(&ustconsumer64_data);
5497 if (ret != 0) {
5498 PERROR("join_consumer ust64");
5499 goto error; /* join error, exit without cleanup */
5500 }
5501
cf3af59e 5502exit_client:
06f525de
DG
5503 ret = pthread_join(health_thread, &status);
5504 if (ret != 0) {
5505 PERROR("pthread_join health thread");
5506 goto error; /* join error, exit without cleanup */
5507 }
5508
44a5e5eb 5509exit_health:
0b2dc8df
MD
5510 ret = pthread_join(ht_cleanup_thread, &status);
5511 if (ret != 0) {
5512 PERROR("pthread_join ht cleanup thread");
5513 goto error; /* join error, exit without cleanup */
5514 }
5515exit_ht_cleanup:
8782cc74
MD
5516 health_app_destroy(health_sessiond);
5517exit_health_sessiond_cleanup:
a88df331 5518exit:
cf3af59e
MD
5519 /*
5520 * cleanup() is called when no other thread is running.
5521 */
f6a9efaa 5522 rcu_thread_online();
cf3af59e 5523 cleanup();
f6a9efaa
DG
5524 rcu_thread_offline();
5525 rcu_unregister_thread();
67e40797 5526 if (!ret) {
cf3af59e 5527 exit(EXIT_SUCCESS);
67e40797 5528 }
cf3af59e 5529error:
5e16da05 5530 exit(EXIT_FAILURE);
fac6795d 5531}
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