Commit | Line | Data |
---|---|---|
826d496d | 1 | /* |
82a3637f DG |
2 | * liblttngctl.c |
3 | * | |
4 | * Linux Trace Toolkit Control Library | |
5 | * | |
826d496d | 6 | * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca> |
fac6795d | 7 | * |
d14d33bf AM |
8 | * This library is free software; you can redistribute it and/or modify it |
9 | * under the terms of the GNU Lesser General Public License, version 2.1 only, | |
10 | * as published by the Free Software Foundation. | |
82a3637f DG |
11 | * |
12 | * This library is distributed in the hope that it will be useful, | |
fac6795d | 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
82a3637f DG |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
15 | * Lesser General Public License for more details. | |
16 | * | |
d14d33bf AM |
17 | * You should have received a copy of the GNU Lesser General Public License |
18 | * along with this library; if not, write to the Free Software Foundation, | |
19 | * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
fac6795d DG |
20 | */ |
21 | ||
22 | #define _GNU_SOURCE | |
44a5e5eb | 23 | #include <assert.h> |
fac6795d | 24 | #include <grp.h> |
1e307fab | 25 | #include <errno.h> |
fac6795d DG |
26 | #include <stdio.h> |
27 | #include <stdlib.h> | |
28 | #include <string.h> | |
29 | #include <unistd.h> | |
30 | ||
990570ed DG |
31 | #include <common/common.h> |
32 | #include <common/defaults.h> | |
db758600 | 33 | #include <common/sessiond-comm/sessiond-comm.h> |
a4b92340 | 34 | #include <common/uri.h> |
1e307fab | 35 | #include <lttng/lttng.h> |
fac6795d | 36 | |
d00c599e DG |
37 | #include "filter/filter-ast.h" |
38 | #include "filter/filter-parser.h" | |
39 | #include "filter/filter-bytecode.h" | |
40 | #include "filter/memstream.h" | |
53a80697 MD |
41 | |
42 | #ifdef DEBUG | |
d00c599e | 43 | static const int print_xml = 1; |
53a80697 MD |
44 | #define dbg_printf(fmt, args...) \ |
45 | printf("[debug liblttng-ctl] " fmt, ## args) | |
46 | #else | |
d00c599e | 47 | static const int print_xml = 0; |
53a80697 MD |
48 | #define dbg_printf(fmt, args...) \ |
49 | do { \ | |
50 | /* do nothing but check printf format */ \ | |
51 | if (0) \ | |
52 | printf("[debug liblttnctl] " fmt, ## args); \ | |
53 | } while (0) | |
54 | #endif | |
55 | ||
56 | ||
fac6795d DG |
57 | /* Socket to session daemon for communication */ |
58 | static int sessiond_socket; | |
59 | static char sessiond_sock_path[PATH_MAX]; | |
44a5e5eb | 60 | static char health_sock_path[PATH_MAX]; |
fac6795d | 61 | |
fac6795d DG |
62 | /* Variables */ |
63 | static char *tracing_group; | |
64 | static int connected; | |
65 | ||
97e19046 DG |
66 | /* Global */ |
67 | ||
68 | /* | |
69 | * Those two variables are used by error.h to silent or control the verbosity of | |
70 | * error message. They are global to the library so application linking with it | |
71 | * are able to compile correctly and also control verbosity of the library. | |
97e19046 DG |
72 | */ |
73 | int lttng_opt_quiet; | |
74 | int lttng_opt_verbose; | |
75 | ||
a4b92340 DG |
76 | static void set_default_url_attr(struct lttng_uri *uri, |
77 | enum lttng_stream_type stype) | |
78 | { | |
79 | uri->stype = stype; | |
80 | if (uri->dtype != LTTNG_DST_PATH && uri->port == 0) { | |
81 | uri->port = (stype == LTTNG_STREAM_CONTROL) ? | |
82 | DEFAULT_NETWORK_CONTROL_PORT : DEFAULT_NETWORK_DATA_PORT; | |
83 | } | |
84 | } | |
85 | ||
86 | /* | |
87 | * Parse a string URL and creates URI(s) returning the size of the populated | |
88 | * array. | |
89 | */ | |
90 | static ssize_t parse_str_urls_to_uri(const char *ctrl_url, const char *data_url, | |
91 | struct lttng_uri **uris) | |
92 | { | |
a4b92340 DG |
93 | unsigned int equal = 1, idx = 0; |
94 | /* Add the "file://" size to the URL maximum size */ | |
95 | char url[PATH_MAX + 7]; | |
96 | ssize_t size_ctrl = 0, size_data = 0, size; | |
97 | struct lttng_uri *ctrl_uris = NULL, *data_uris = NULL; | |
98 | struct lttng_uri *tmp_uris = NULL; | |
99 | ||
100 | /* No URL(s) is allowed. This means that the consumer will be disabled. */ | |
101 | if (ctrl_url == NULL && data_url == NULL) { | |
102 | return 0; | |
103 | } | |
104 | ||
105 | /* Check if URLs are equal and if so, only use the control URL */ | |
106 | if (ctrl_url && data_url) { | |
107 | equal = !strcmp(ctrl_url, data_url); | |
108 | } | |
109 | ||
110 | /* | |
111 | * Since we allow the str_url to be a full local filesystem path, we are | |
112 | * going to create a valid file:// URL if it's the case. | |
113 | * | |
114 | * Check if first character is a '/' or else reject the URL. | |
115 | */ | |
116 | if (ctrl_url && ctrl_url[0] == '/') { | |
c617c0c6 MD |
117 | int ret; |
118 | ||
a4b92340 DG |
119 | ret = snprintf(url, sizeof(url), "file://%s", ctrl_url); |
120 | if (ret < 0) { | |
121 | PERROR("snprintf file url"); | |
122 | goto parse_error; | |
123 | } | |
124 | ctrl_url = url; | |
125 | } | |
126 | ||
127 | /* Parse the control URL if there is one */ | |
128 | if (ctrl_url) { | |
129 | size_ctrl = uri_parse(ctrl_url, &ctrl_uris); | |
130 | if (size_ctrl < 1) { | |
131 | ERR("Unable to parse the URL %s", ctrl_url); | |
132 | goto parse_error; | |
133 | } | |
134 | ||
135 | /* At this point, we know there is at least one URI in the array */ | |
136 | set_default_url_attr(&ctrl_uris[0], LTTNG_STREAM_CONTROL); | |
137 | ||
138 | if (ctrl_uris[0].dtype == LTTNG_DST_PATH && data_url) { | |
139 | ERR("Can not have a data URL when destination is file://"); | |
140 | goto error; | |
141 | } | |
142 | ||
143 | /* URL are not equal but the control URL uses a net:// protocol */ | |
144 | if (size_ctrl == 2) { | |
145 | if (!equal) { | |
146 | ERR("Control URL uses the net:// protocol and the data URL is " | |
147 | "different. Not allowed."); | |
148 | goto error; | |
149 | } else { | |
150 | set_default_url_attr(&ctrl_uris[1], LTTNG_STREAM_DATA); | |
151 | /* | |
152 | * The data_url and ctrl_url are equal and the ctrl_url | |
153 | * contains a net:// protocol so we just skip the data part. | |
154 | */ | |
155 | data_url = NULL; | |
156 | } | |
157 | } | |
158 | } | |
159 | ||
160 | if (data_url) { | |
161 | /* We have to parse the data URL in this case */ | |
162 | size_data = uri_parse(data_url, &data_uris); | |
163 | if (size_data < 1) { | |
164 | ERR("Unable to parse the URL %s", data_url); | |
165 | goto error; | |
166 | } else if (size_data == 2) { | |
167 | ERR("Data URL can not be set with the net[4|6]:// protocol"); | |
168 | goto error; | |
169 | } | |
170 | ||
171 | set_default_url_attr(&data_uris[0], LTTNG_STREAM_DATA); | |
172 | } | |
173 | ||
174 | /* Compute total size */ | |
175 | size = size_ctrl + size_data; | |
176 | ||
177 | tmp_uris = zmalloc(sizeof(struct lttng_uri) * size); | |
178 | if (tmp_uris == NULL) { | |
179 | PERROR("zmalloc uris"); | |
180 | goto error; | |
181 | } | |
182 | ||
183 | if (ctrl_uris) { | |
184 | /* It's possible the control URIs array contains more than one URI */ | |
185 | memcpy(tmp_uris, ctrl_uris, sizeof(struct lttng_uri) * size_ctrl); | |
186 | ++idx; | |
187 | } | |
188 | ||
189 | if (data_uris) { | |
190 | memcpy(&tmp_uris[idx], data_uris, sizeof(struct lttng_uri)); | |
191 | } | |
192 | ||
193 | *uris = tmp_uris; | |
194 | ||
195 | return size; | |
196 | ||
197 | error: | |
198 | free(ctrl_uris); | |
199 | free(data_uris); | |
200 | free(tmp_uris); | |
201 | parse_error: | |
202 | return -1; | |
203 | } | |
204 | ||
99497cd0 MD |
205 | /* |
206 | * Copy string from src to dst and enforce null terminated byte. | |
207 | */ | |
208 | static void copy_string(char *dst, const char *src, size_t len) | |
209 | { | |
e7d6716d | 210 | if (src && dst) { |
99497cd0 MD |
211 | strncpy(dst, src, len); |
212 | /* Enforce the NULL terminated byte */ | |
213 | dst[len - 1] = '\0'; | |
cd80958d DG |
214 | } else if (dst) { |
215 | dst[0] = '\0'; | |
99497cd0 MD |
216 | } |
217 | } | |
218 | ||
fac6795d | 219 | /* |
cd80958d | 220 | * Copy domain to lttcomm_session_msg domain. |
fac6795d | 221 | * |
cd80958d DG |
222 | * If domain is unknown, default domain will be the kernel. |
223 | */ | |
224 | static void copy_lttng_domain(struct lttng_domain *dst, struct lttng_domain *src) | |
225 | { | |
226 | if (src && dst) { | |
227 | switch (src->type) { | |
00e2e675 DG |
228 | case LTTNG_DOMAIN_KERNEL: |
229 | case LTTNG_DOMAIN_UST: | |
230 | /* | |
231 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
232 | case LTTNG_DOMAIN_UST_PID: | |
233 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
234 | */ | |
235 | memcpy(dst, src, sizeof(struct lttng_domain)); | |
236 | break; | |
237 | default: | |
238 | memset(dst, 0, sizeof(struct lttng_domain)); | |
00e2e675 | 239 | break; |
cd80958d DG |
240 | } |
241 | } | |
242 | } | |
243 | ||
244 | /* | |
245 | * Send lttcomm_session_msg to the session daemon. | |
fac6795d | 246 | * |
1c8d13c8 TD |
247 | * On success, returns the number of bytes sent (>=0) |
248 | * On error, returns -1 | |
fac6795d | 249 | */ |
cd80958d | 250 | static int send_session_msg(struct lttcomm_session_msg *lsm) |
fac6795d DG |
251 | { |
252 | int ret; | |
253 | ||
254 | if (!connected) { | |
2f70b271 | 255 | ret = -LTTNG_ERR_NO_SESSIOND; |
e065084a | 256 | goto end; |
fac6795d DG |
257 | } |
258 | ||
a4b92340 DG |
259 | DBG("LSM cmd type : %d", lsm->cmd_type); |
260 | ||
be040666 | 261 | ret = lttcomm_send_creds_unix_sock(sessiond_socket, lsm, |
cd80958d | 262 | sizeof(struct lttcomm_session_msg)); |
2f70b271 DG |
263 | if (ret < 0) { |
264 | ret = -LTTNG_ERR_FATAL; | |
265 | } | |
e065084a DG |
266 | |
267 | end: | |
268 | return ret; | |
269 | } | |
270 | ||
53a80697 MD |
271 | /* |
272 | * Send var len data to the session daemon. | |
273 | * | |
274 | * On success, returns the number of bytes sent (>=0) | |
275 | * On error, returns -1 | |
276 | */ | |
277 | static int send_session_varlen(void *data, size_t len) | |
278 | { | |
279 | int ret; | |
280 | ||
281 | if (!connected) { | |
2f70b271 | 282 | ret = -LTTNG_ERR_NO_SESSIOND; |
53a80697 MD |
283 | goto end; |
284 | } | |
a4b92340 | 285 | |
53a80697 MD |
286 | if (!data || !len) { |
287 | ret = 0; | |
288 | goto end; | |
289 | } | |
290 | ||
291 | ret = lttcomm_send_unix_sock(sessiond_socket, data, len); | |
2f70b271 DG |
292 | if (ret < 0) { |
293 | ret = -LTTNG_ERR_FATAL; | |
294 | } | |
53a80697 MD |
295 | |
296 | end: | |
297 | return ret; | |
298 | } | |
299 | ||
e065084a | 300 | /* |
cd80958d | 301 | * Receive data from the sessiond socket. |
e065084a | 302 | * |
1c8d13c8 TD |
303 | * On success, returns the number of bytes received (>=0) |
304 | * On error, returns -1 (recvmsg() error) or -ENOTCONN | |
e065084a | 305 | */ |
ca95a216 | 306 | static int recv_data_sessiond(void *buf, size_t len) |
e065084a DG |
307 | { |
308 | int ret; | |
309 | ||
310 | if (!connected) { | |
2f70b271 | 311 | ret = -LTTNG_ERR_NO_SESSIOND; |
e065084a | 312 | goto end; |
fac6795d DG |
313 | } |
314 | ||
ca95a216 | 315 | ret = lttcomm_recv_unix_sock(sessiond_socket, buf, len); |
2f70b271 DG |
316 | if (ret < 0) { |
317 | ret = -LTTNG_ERR_FATAL; | |
318 | } | |
fac6795d | 319 | |
e065084a | 320 | end: |
fac6795d DG |
321 | return ret; |
322 | } | |
323 | ||
324 | /* | |
1c8d13c8 | 325 | * Check if we are in the specified group. |
65beb5ff | 326 | * |
2269e89e | 327 | * If yes return 1, else return -1. |
947308c4 DG |
328 | */ |
329 | static int check_tracing_group(const char *grp_name) | |
330 | { | |
331 | struct group *grp_tracing; /* no free(). See getgrnam(3) */ | |
332 | gid_t *grp_list; | |
333 | int grp_list_size, grp_id, i; | |
334 | int ret = -1; | |
335 | ||
336 | /* Get GID of group 'tracing' */ | |
337 | grp_tracing = getgrnam(grp_name); | |
b4d8603b MD |
338 | if (!grp_tracing) { |
339 | /* If grp_tracing is NULL, the group does not exist. */ | |
947308c4 DG |
340 | goto end; |
341 | } | |
342 | ||
343 | /* Get number of supplementary group IDs */ | |
344 | grp_list_size = getgroups(0, NULL); | |
345 | if (grp_list_size < 0) { | |
346 | perror("getgroups"); | |
347 | goto end; | |
348 | } | |
349 | ||
350 | /* Alloc group list of the right size */ | |
351 | grp_list = malloc(grp_list_size * sizeof(gid_t)); | |
00795392 | 352 | if (!grp_list) { |
1c8d13c8 | 353 | perror("malloc"); |
00795392 MD |
354 | goto end; |
355 | } | |
947308c4 | 356 | grp_id = getgroups(grp_list_size, grp_list); |
1c8d13c8 | 357 | if (grp_id < 0) { |
947308c4 DG |
358 | perror("getgroups"); |
359 | goto free_list; | |
360 | } | |
361 | ||
362 | for (i = 0; i < grp_list_size; i++) { | |
363 | if (grp_list[i] == grp_tracing->gr_gid) { | |
2269e89e | 364 | ret = 1; |
947308c4 DG |
365 | break; |
366 | } | |
367 | } | |
368 | ||
369 | free_list: | |
370 | free(grp_list); | |
371 | ||
372 | end: | |
373 | return ret; | |
374 | } | |
375 | ||
376 | /* | |
2269e89e DG |
377 | * Try connect to session daemon with sock_path. |
378 | * | |
379 | * Return 0 on success, else -1 | |
380 | */ | |
381 | static int try_connect_sessiond(const char *sock_path) | |
382 | { | |
383 | int ret; | |
384 | ||
385 | /* If socket exist, we check if the daemon listens for connect. */ | |
386 | ret = access(sock_path, F_OK); | |
387 | if (ret < 0) { | |
388 | /* Not alive */ | |
2f70b271 | 389 | goto error; |
2269e89e DG |
390 | } |
391 | ||
392 | ret = lttcomm_connect_unix_sock(sock_path); | |
393 | if (ret < 0) { | |
394 | /* Not alive */ | |
2f70b271 | 395 | goto error; |
2269e89e DG |
396 | } |
397 | ||
398 | ret = lttcomm_close_unix_sock(ret); | |
399 | if (ret < 0) { | |
400 | perror("lttcomm_close_unix_sock"); | |
401 | } | |
402 | ||
403 | return 0; | |
2f70b271 DG |
404 | |
405 | error: | |
406 | return -1; | |
2269e89e DG |
407 | } |
408 | ||
409 | /* | |
2f70b271 DG |
410 | * Set sessiond socket path by putting it in the global sessiond_sock_path |
411 | * variable. | |
412 | * | |
413 | * Returns 0 on success, negative value on failure (the sessiond socket path | |
414 | * is somehow too long or ENOMEM). | |
947308c4 DG |
415 | */ |
416 | static int set_session_daemon_path(void) | |
417 | { | |
2269e89e DG |
418 | int in_tgroup = 0; /* In tracing group */ |
419 | uid_t uid; | |
420 | ||
421 | uid = getuid(); | |
947308c4 | 422 | |
2269e89e DG |
423 | if (uid != 0) { |
424 | /* Are we in the tracing group ? */ | |
425 | in_tgroup = check_tracing_group(tracing_group); | |
426 | } | |
427 | ||
08a9c49f TD |
428 | if ((uid == 0) || in_tgroup) { |
429 | copy_string(sessiond_sock_path, DEFAULT_GLOBAL_CLIENT_UNIX_SOCK, | |
2269e89e | 430 | sizeof(sessiond_sock_path)); |
08a9c49f | 431 | } |
2269e89e | 432 | |
08a9c49f | 433 | if (uid != 0) { |
c617c0c6 MD |
434 | int ret; |
435 | ||
08a9c49f TD |
436 | if (in_tgroup) { |
437 | /* Tracing group */ | |
438 | ret = try_connect_sessiond(sessiond_sock_path); | |
439 | if (ret >= 0) { | |
440 | goto end; | |
2269e89e | 441 | } |
08a9c49f | 442 | /* Global session daemon not available... */ |
2269e89e | 443 | } |
08a9c49f TD |
444 | /* ...or not in tracing group (and not root), default */ |
445 | ||
446 | /* | |
447 | * With GNU C < 2.1, snprintf returns -1 if the target buffer is too small; | |
448 | * With GNU C >= 2.1, snprintf returns the required size (excluding closing null) | |
449 | */ | |
450 | ret = snprintf(sessiond_sock_path, sizeof(sessiond_sock_path), | |
451 | DEFAULT_HOME_CLIENT_UNIX_SOCK, getenv("HOME")); | |
452 | if ((ret < 0) || (ret >= sizeof(sessiond_sock_path))) { | |
2f70b271 | 453 | goto error; |
947308c4 | 454 | } |
947308c4 | 455 | } |
08a9c49f | 456 | end: |
947308c4 | 457 | return 0; |
2f70b271 DG |
458 | |
459 | error: | |
460 | return -1; | |
947308c4 DG |
461 | } |
462 | ||
65beb5ff DG |
463 | /* |
464 | * Connect to the LTTng session daemon. | |
465 | * | |
466 | * On success, return 0. On error, return -1. | |
467 | */ | |
468 | static int connect_sessiond(void) | |
469 | { | |
470 | int ret; | |
471 | ||
472 | ret = set_session_daemon_path(); | |
473 | if (ret < 0) { | |
2f70b271 | 474 | goto error; |
65beb5ff DG |
475 | } |
476 | ||
477 | /* Connect to the sesssion daemon */ | |
478 | ret = lttcomm_connect_unix_sock(sessiond_sock_path); | |
479 | if (ret < 0) { | |
2f70b271 | 480 | goto error; |
65beb5ff DG |
481 | } |
482 | ||
483 | sessiond_socket = ret; | |
484 | connected = 1; | |
485 | ||
486 | return 0; | |
2f70b271 DG |
487 | |
488 | error: | |
489 | return -1; | |
65beb5ff DG |
490 | } |
491 | ||
492 | /* | |
1c8d13c8 TD |
493 | * Clean disconnect from the session daemon. |
494 | * On success, return 0. On error, return -1. | |
65beb5ff DG |
495 | */ |
496 | static int disconnect_sessiond(void) | |
497 | { | |
498 | int ret = 0; | |
499 | ||
500 | if (connected) { | |
501 | ret = lttcomm_close_unix_sock(sessiond_socket); | |
502 | sessiond_socket = 0; | |
503 | connected = 0; | |
504 | } | |
505 | ||
506 | return ret; | |
507 | } | |
508 | ||
35a6fdb7 | 509 | /* |
cd80958d | 510 | * Ask the session daemon a specific command and put the data into buf. |
53a80697 | 511 | * Takes extra var. len. data as input to send to the session daemon. |
65beb5ff | 512 | * |
af87c45a | 513 | * Return size of data (only payload, not header) or a negative error code. |
65beb5ff | 514 | */ |
53a80697 | 515 | static int ask_sessiond_varlen(struct lttcomm_session_msg *lsm, |
a4b92340 | 516 | void *vardata, size_t varlen, void **buf) |
65beb5ff DG |
517 | { |
518 | int ret; | |
519 | size_t size; | |
520 | void *data = NULL; | |
cd80958d | 521 | struct lttcomm_lttng_msg llm; |
65beb5ff DG |
522 | |
523 | ret = connect_sessiond(); | |
524 | if (ret < 0) { | |
2f70b271 | 525 | ret = -LTTNG_ERR_NO_SESSIOND; |
65beb5ff DG |
526 | goto end; |
527 | } | |
528 | ||
65beb5ff | 529 | /* Send command to session daemon */ |
cd80958d | 530 | ret = send_session_msg(lsm); |
65beb5ff | 531 | if (ret < 0) { |
2f70b271 | 532 | /* Ret value is a valid lttng error code. */ |
65beb5ff DG |
533 | goto end; |
534 | } | |
53a80697 MD |
535 | /* Send var len data */ |
536 | ret = send_session_varlen(vardata, varlen); | |
537 | if (ret < 0) { | |
2f70b271 | 538 | /* Ret value is a valid lttng error code. */ |
53a80697 MD |
539 | goto end; |
540 | } | |
65beb5ff DG |
541 | |
542 | /* Get header from data transmission */ | |
543 | ret = recv_data_sessiond(&llm, sizeof(llm)); | |
544 | if (ret < 0) { | |
2f70b271 | 545 | /* Ret value is a valid lttng error code. */ |
65beb5ff DG |
546 | goto end; |
547 | } | |
548 | ||
549 | /* Check error code if OK */ | |
f73fabfd | 550 | if (llm.ret_code != LTTNG_OK) { |
65beb5ff DG |
551 | ret = -llm.ret_code; |
552 | goto end; | |
553 | } | |
554 | ||
555 | size = llm.data_size; | |
556 | if (size == 0) { | |
874d3f84 | 557 | /* If client free with size 0 */ |
a45d5536 DG |
558 | if (buf != NULL) { |
559 | *buf = NULL; | |
560 | } | |
7d29a247 | 561 | ret = 0; |
65beb5ff DG |
562 | goto end; |
563 | } | |
564 | ||
565 | data = (void*) malloc(size); | |
566 | ||
567 | /* Get payload data */ | |
568 | ret = recv_data_sessiond(data, size); | |
569 | if (ret < 0) { | |
570 | free(data); | |
571 | goto end; | |
572 | } | |
573 | ||
83009e5e DG |
574 | /* |
575 | * Extra protection not to dereference a NULL pointer. If buf is NULL at | |
576 | * this point, an error is returned and data is freed. | |
577 | */ | |
578 | if (buf == NULL) { | |
2f70b271 | 579 | ret = -LTTNG_ERR_INVALID; |
83009e5e DG |
580 | free(data); |
581 | goto end; | |
582 | } | |
583 | ||
65beb5ff DG |
584 | *buf = data; |
585 | ret = size; | |
586 | ||
587 | end: | |
588 | disconnect_sessiond(); | |
589 | return ret; | |
590 | } | |
591 | ||
53a80697 MD |
592 | /* |
593 | * Ask the session daemon a specific command and put the data into buf. | |
594 | * | |
595 | * Return size of data (only payload, not header) or a negative error code. | |
596 | */ | |
597 | static int ask_sessiond(struct lttcomm_session_msg *lsm, void **buf) | |
598 | { | |
599 | return ask_sessiond_varlen(lsm, NULL, 0, buf); | |
600 | } | |
601 | ||
9f19cc17 | 602 | /* |
cd80958d | 603 | * Create lttng handle and return pointer. |
1c8d13c8 | 604 | * The returned pointer will be NULL in case of malloc() error. |
9f19cc17 | 605 | */ |
cd80958d DG |
606 | struct lttng_handle *lttng_create_handle(const char *session_name, |
607 | struct lttng_domain *domain) | |
9f19cc17 | 608 | { |
2f70b271 DG |
609 | struct lttng_handle *handle = NULL; |
610 | ||
611 | if (domain == NULL) { | |
612 | goto end; | |
613 | } | |
cd80958d DG |
614 | |
615 | handle = malloc(sizeof(struct lttng_handle)); | |
616 | if (handle == NULL) { | |
2f70b271 | 617 | PERROR("malloc handle"); |
cd80958d DG |
618 | goto end; |
619 | } | |
620 | ||
621 | /* Copy session name */ | |
622 | copy_string(handle->session_name, session_name, | |
623 | sizeof(handle->session_name)); | |
624 | ||
625 | /* Copy lttng domain */ | |
626 | copy_lttng_domain(&handle->domain, domain); | |
627 | ||
628 | end: | |
629 | return handle; | |
630 | } | |
631 | ||
632 | /* | |
633 | * Destroy handle by free(3) the pointer. | |
634 | */ | |
635 | void lttng_destroy_handle(struct lttng_handle *handle) | |
636 | { | |
637 | if (handle) { | |
638 | free(handle); | |
eb354453 DG |
639 | } |
640 | } | |
641 | ||
d9800920 DG |
642 | /* |
643 | * Register an outside consumer. | |
1c8d13c8 | 644 | * Returns size of returned session payload data or a negative error code. |
d9800920 DG |
645 | */ |
646 | int lttng_register_consumer(struct lttng_handle *handle, | |
647 | const char *socket_path) | |
648 | { | |
649 | struct lttcomm_session_msg lsm; | |
650 | ||
2f70b271 DG |
651 | if (handle == NULL || socket_path == NULL) { |
652 | return -LTTNG_ERR_INVALID; | |
653 | } | |
654 | ||
d9800920 DG |
655 | lsm.cmd_type = LTTNG_REGISTER_CONSUMER; |
656 | copy_string(lsm.session.name, handle->session_name, | |
657 | sizeof(lsm.session.name)); | |
658 | copy_lttng_domain(&lsm.domain, &handle->domain); | |
659 | ||
660 | copy_string(lsm.u.reg.path, socket_path, sizeof(lsm.u.reg.path)); | |
661 | ||
662 | return ask_sessiond(&lsm, NULL); | |
663 | } | |
664 | ||
1df4dedd | 665 | /* |
1c8d13c8 TD |
666 | * Start tracing for all traces of the session. |
667 | * Returns size of returned session payload data or a negative error code. | |
1df4dedd | 668 | */ |
6a4f824d | 669 | int lttng_start_tracing(const char *session_name) |
f3ed775e | 670 | { |
cd80958d DG |
671 | struct lttcomm_session_msg lsm; |
672 | ||
6a4f824d | 673 | if (session_name == NULL) { |
2f70b271 | 674 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
675 | } |
676 | ||
677 | lsm.cmd_type = LTTNG_START_TRACE; | |
6a4f824d DG |
678 | |
679 | copy_string(lsm.session.name, session_name, sizeof(lsm.session.name)); | |
cd80958d DG |
680 | |
681 | return ask_sessiond(&lsm, NULL); | |
f3ed775e | 682 | } |
1df4dedd DG |
683 | |
684 | /* | |
38ee087f | 685 | * Stop tracing for all traces of the session. |
f3ed775e | 686 | */ |
38ee087f | 687 | static int _lttng_stop_tracing(const char *session_name, int wait) |
f3ed775e | 688 | { |
38ee087f | 689 | int ret, data_ret; |
cd80958d DG |
690 | struct lttcomm_session_msg lsm; |
691 | ||
6a4f824d | 692 | if (session_name == NULL) { |
2f70b271 | 693 | return -LTTNG_ERR_INVALID; |
6a4f824d DG |
694 | } |
695 | ||
cd80958d | 696 | lsm.cmd_type = LTTNG_STOP_TRACE; |
6a4f824d DG |
697 | |
698 | copy_string(lsm.session.name, session_name, sizeof(lsm.session.name)); | |
cd80958d | 699 | |
38ee087f DG |
700 | ret = ask_sessiond(&lsm, NULL); |
701 | if (ret < 0 && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) { | |
702 | goto error; | |
703 | } | |
704 | ||
705 | if (!wait) { | |
706 | goto end; | |
707 | } | |
708 | ||
709 | _MSG("Waiting for data availability"); | |
710 | ||
711 | /* Check for data availability */ | |
712 | do { | |
6d805429 | 713 | data_ret = lttng_data_pending(session_name); |
38ee087f DG |
714 | if (data_ret < 0) { |
715 | /* Return the data available call error. */ | |
716 | ret = data_ret; | |
717 | goto error; | |
718 | } | |
719 | ||
720 | /* | |
721 | * Data sleep time before retrying (in usec). Don't sleep if the call | |
722 | * returned value indicates availability. | |
723 | */ | |
6d805429 | 724 | if (data_ret) { |
38ee087f DG |
725 | usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME); |
726 | _MSG("."); | |
727 | } | |
6d805429 | 728 | } while (data_ret != 0); |
38ee087f DG |
729 | |
730 | MSG(""); | |
731 | ||
732 | end: | |
733 | error: | |
734 | return ret; | |
735 | } | |
736 | ||
737 | /* | |
738 | * Stop tracing and wait for data availability. | |
739 | */ | |
740 | int lttng_stop_tracing(const char *session_name) | |
741 | { | |
742 | return _lttng_stop_tracing(session_name, 1); | |
743 | } | |
744 | ||
745 | /* | |
746 | * Stop tracing but _don't_ wait for data availability. | |
747 | */ | |
748 | int lttng_stop_tracing_no_wait(const char *session_name) | |
749 | { | |
750 | return _lttng_stop_tracing(session_name, 0); | |
f3ed775e DG |
751 | } |
752 | ||
753 | /* | |
601d5acf DG |
754 | * Add context to a channel. |
755 | * | |
756 | * If the given channel is NULL, add the contexts to all channels. | |
757 | * The event_name param is ignored. | |
af87c45a DG |
758 | * |
759 | * Returns the size of the returned payload data or a negative error code. | |
1df4dedd | 760 | */ |
cd80958d | 761 | int lttng_add_context(struct lttng_handle *handle, |
38057ed1 DG |
762 | struct lttng_event_context *ctx, const char *event_name, |
763 | const char *channel_name) | |
d65106b1 | 764 | { |
cd80958d DG |
765 | struct lttcomm_session_msg lsm; |
766 | ||
9d697d3d DG |
767 | /* Safety check. Both are mandatory */ |
768 | if (handle == NULL || ctx == NULL) { | |
2f70b271 | 769 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
770 | } |
771 | ||
441c16a7 MD |
772 | memset(&lsm, 0, sizeof(lsm)); |
773 | ||
cd80958d DG |
774 | lsm.cmd_type = LTTNG_ADD_CONTEXT; |
775 | ||
776 | /* Copy channel name */ | |
777 | copy_string(lsm.u.context.channel_name, channel_name, | |
778 | sizeof(lsm.u.context.channel_name)); | |
cd80958d DG |
779 | |
780 | copy_lttng_domain(&lsm.domain, &handle->domain); | |
d65106b1 | 781 | |
9d697d3d | 782 | memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context)); |
d65106b1 | 783 | |
cd80958d DG |
784 | copy_string(lsm.session.name, handle->session_name, |
785 | sizeof(lsm.session.name)); | |
786 | ||
787 | return ask_sessiond(&lsm, NULL); | |
d65106b1 DG |
788 | } |
789 | ||
f3ed775e | 790 | /* |
1c8d13c8 TD |
791 | * Enable event(s) for a channel. |
792 | * If no event name is specified, all events are enabled. | |
793 | * If no channel name is specified, the default 'channel0' is used. | |
794 | * Returns size of returned session payload data or a negative error code. | |
f3ed775e | 795 | */ |
cd80958d | 796 | int lttng_enable_event(struct lttng_handle *handle, |
38057ed1 | 797 | struct lttng_event *ev, const char *channel_name) |
1df4dedd | 798 | { |
cd80958d DG |
799 | struct lttcomm_session_msg lsm; |
800 | ||
5117eeec | 801 | if (handle == NULL || ev == NULL) { |
2f70b271 | 802 | return -LTTNG_ERR_INVALID; |
cd80958d | 803 | } |
33a2b854 | 804 | |
441c16a7 MD |
805 | memset(&lsm, 0, sizeof(lsm)); |
806 | ||
5117eeec | 807 | /* If no channel name, we put the default name */ |
94cf3c47 | 808 | if (channel_name == NULL) { |
cd80958d DG |
809 | copy_string(lsm.u.enable.channel_name, DEFAULT_CHANNEL_NAME, |
810 | sizeof(lsm.u.enable.channel_name)); | |
33a2b854 | 811 | } else { |
cd80958d DG |
812 | copy_string(lsm.u.enable.channel_name, channel_name, |
813 | sizeof(lsm.u.enable.channel_name)); | |
eb354453 DG |
814 | } |
815 | ||
cd80958d | 816 | copy_lttng_domain(&lsm.domain, &handle->domain); |
0d0c377a | 817 | |
8c9ae521 | 818 | if (ev->name[0] != '\0') { |
cd80958d | 819 | lsm.cmd_type = LTTNG_ENABLE_EVENT; |
0d0c377a | 820 | } else { |
cd80958d | 821 | lsm.cmd_type = LTTNG_ENABLE_ALL_EVENT; |
f3ed775e | 822 | } |
8c9ae521 | 823 | memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event)); |
f3ed775e | 824 | |
cd80958d DG |
825 | copy_string(lsm.session.name, handle->session_name, |
826 | sizeof(lsm.session.name)); | |
827 | ||
828 | return ask_sessiond(&lsm, NULL); | |
1df4dedd DG |
829 | } |
830 | ||
53a80697 | 831 | /* |
025faf73 | 832 | * Create or enable an event with a filter expression. |
178191b3 | 833 | * |
53a80697 MD |
834 | * Return negative error value on error. |
835 | * Return size of returned session payload data if OK. | |
836 | */ | |
025faf73 | 837 | int lttng_enable_event_with_filter(struct lttng_handle *handle, |
178191b3 | 838 | struct lttng_event *event, const char *channel_name, |
53a80697 MD |
839 | const char *filter_expression) |
840 | { | |
841 | struct lttcomm_session_msg lsm; | |
842 | struct filter_parser_ctx *ctx; | |
843 | FILE *fmem; | |
844 | int ret = 0; | |
845 | ||
52df2401 MD |
846 | if (!filter_expression) { |
847 | /* | |
848 | * Fall back to normal event enabling if no filter | |
849 | * specified. | |
850 | */ | |
851 | return lttng_enable_event(handle, event, channel_name); | |
852 | } | |
853 | ||
854 | /* | |
855 | * Empty filter string will always be rejected by the parser | |
856 | * anyway, so treat this corner-case early to eliminate | |
857 | * lttng_fmemopen error for 0-byte allocation. | |
858 | */ | |
859 | if (handle == NULL || filter_expression[0] == '\0') { | |
2f70b271 | 860 | return -LTTNG_ERR_INVALID; |
53a80697 MD |
861 | } |
862 | ||
53a80697 MD |
863 | /* |
864 | * casting const to non-const, as the underlying function will | |
865 | * use it in read-only mode. | |
866 | */ | |
867 | fmem = lttng_fmemopen((void *) filter_expression, | |
868 | strlen(filter_expression), "r"); | |
869 | if (!fmem) { | |
870 | fprintf(stderr, "Error opening memory as stream\n"); | |
ff7ef7b8 | 871 | return -LTTNG_ERR_FILTER_NOMEM; |
53a80697 MD |
872 | } |
873 | ctx = filter_parser_ctx_alloc(fmem); | |
874 | if (!ctx) { | |
875 | fprintf(stderr, "Error allocating parser\n"); | |
ff7ef7b8 | 876 | ret = -LTTNG_ERR_FILTER_NOMEM; |
53a80697 MD |
877 | goto alloc_error; |
878 | } | |
879 | ret = filter_parser_ctx_append_ast(ctx); | |
880 | if (ret) { | |
881 | fprintf(stderr, "Parse error\n"); | |
ff7ef7b8 | 882 | ret = -LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
883 | goto parse_error; |
884 | } | |
885 | ret = filter_visitor_set_parent(ctx); | |
886 | if (ret) { | |
887 | fprintf(stderr, "Set parent error\n"); | |
ff7ef7b8 | 888 | ret = -LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
889 | goto parse_error; |
890 | } | |
891 | if (print_xml) { | |
892 | ret = filter_visitor_print_xml(ctx, stdout, 0); | |
893 | if (ret) { | |
894 | fflush(stdout); | |
895 | fprintf(stderr, "XML print error\n"); | |
ff7ef7b8 | 896 | ret = -LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
897 | goto parse_error; |
898 | } | |
899 | } | |
900 | ||
901 | dbg_printf("Generating IR... "); | |
902 | fflush(stdout); | |
903 | ret = filter_visitor_ir_generate(ctx); | |
904 | if (ret) { | |
905 | fprintf(stderr, "Generate IR error\n"); | |
ff7ef7b8 | 906 | ret = -LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
907 | goto parse_error; |
908 | } | |
909 | dbg_printf("done\n"); | |
910 | ||
911 | dbg_printf("Validating IR... "); | |
912 | fflush(stdout); | |
913 | ret = filter_visitor_ir_check_binary_op_nesting(ctx); | |
914 | if (ret) { | |
ff7ef7b8 | 915 | ret = -LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
916 | goto parse_error; |
917 | } | |
918 | dbg_printf("done\n"); | |
919 | ||
920 | dbg_printf("Generating bytecode... "); | |
921 | fflush(stdout); | |
922 | ret = filter_visitor_bytecode_generate(ctx); | |
923 | if (ret) { | |
924 | fprintf(stderr, "Generate bytecode error\n"); | |
ff7ef7b8 | 925 | ret = -LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
926 | goto parse_error; |
927 | } | |
928 | dbg_printf("done\n"); | |
929 | dbg_printf("Size of bytecode generated: %u bytes.\n", | |
930 | bytecode_get_len(&ctx->bytecode->b)); | |
931 | ||
932 | memset(&lsm, 0, sizeof(lsm)); | |
933 | ||
025faf73 | 934 | lsm.cmd_type = LTTNG_ENABLE_EVENT_WITH_FILTER; |
53a80697 MD |
935 | |
936 | /* Copy channel name */ | |
025faf73 DG |
937 | copy_string(lsm.u.enable.channel_name, channel_name, |
938 | sizeof(lsm.u.enable.channel_name)); | |
53a80697 | 939 | /* Copy event name */ |
178191b3 DG |
940 | if (event) { |
941 | memcpy(&lsm.u.enable.event, event, sizeof(lsm.u.enable.event)); | |
942 | } | |
943 | ||
025faf73 | 944 | lsm.u.enable.bytecode_len = sizeof(ctx->bytecode->b) |
53a80697 MD |
945 | + bytecode_get_len(&ctx->bytecode->b); |
946 | ||
947 | copy_lttng_domain(&lsm.domain, &handle->domain); | |
948 | ||
949 | copy_string(lsm.session.name, handle->session_name, | |
950 | sizeof(lsm.session.name)); | |
951 | ||
952 | ret = ask_sessiond_varlen(&lsm, &ctx->bytecode->b, | |
025faf73 | 953 | lsm.u.enable.bytecode_len, NULL); |
53a80697 MD |
954 | |
955 | filter_bytecode_free(ctx); | |
956 | filter_ir_free(ctx); | |
957 | filter_parser_ctx_free(ctx); | |
958 | if (fclose(fmem) != 0) { | |
959 | perror("fclose"); | |
960 | } | |
961 | return ret; | |
962 | ||
963 | parse_error: | |
964 | filter_bytecode_free(ctx); | |
965 | filter_ir_free(ctx); | |
966 | filter_parser_ctx_free(ctx); | |
967 | alloc_error: | |
968 | if (fclose(fmem) != 0) { | |
969 | perror("fclose"); | |
970 | } | |
971 | return ret; | |
972 | } | |
973 | ||
1df4dedd | 974 | /* |
1c8d13c8 TD |
975 | * Disable event(s) of a channel and domain. |
976 | * If no event name is specified, all events are disabled. | |
977 | * If no channel name is specified, the default 'channel0' is used. | |
978 | * Returns size of returned session payload data or a negative error code. | |
1df4dedd | 979 | */ |
cd80958d | 980 | int lttng_disable_event(struct lttng_handle *handle, const char *name, |
38057ed1 | 981 | const char *channel_name) |
1df4dedd | 982 | { |
cd80958d | 983 | struct lttcomm_session_msg lsm; |
1df4dedd | 984 | |
9d697d3d | 985 | if (handle == NULL) { |
2f70b271 | 986 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
987 | } |
988 | ||
441c16a7 MD |
989 | memset(&lsm, 0, sizeof(lsm)); |
990 | ||
cd80958d DG |
991 | if (channel_name) { |
992 | copy_string(lsm.u.disable.channel_name, channel_name, | |
993 | sizeof(lsm.u.disable.channel_name)); | |
f3ed775e | 994 | } else { |
cd80958d DG |
995 | copy_string(lsm.u.disable.channel_name, DEFAULT_CHANNEL_NAME, |
996 | sizeof(lsm.u.disable.channel_name)); | |
eb354453 DG |
997 | } |
998 | ||
cd80958d | 999 | copy_lttng_domain(&lsm.domain, &handle->domain); |
f5177a38 | 1000 | |
f84efadf | 1001 | if (name != NULL) { |
cd80958d DG |
1002 | copy_string(lsm.u.disable.name, name, sizeof(lsm.u.disable.name)); |
1003 | lsm.cmd_type = LTTNG_DISABLE_EVENT; | |
f5177a38 | 1004 | } else { |
cd80958d | 1005 | lsm.cmd_type = LTTNG_DISABLE_ALL_EVENT; |
f3ed775e DG |
1006 | } |
1007 | ||
cd80958d DG |
1008 | copy_string(lsm.session.name, handle->session_name, |
1009 | sizeof(lsm.session.name)); | |
1010 | ||
1011 | return ask_sessiond(&lsm, NULL); | |
1df4dedd DG |
1012 | } |
1013 | ||
1014 | /* | |
1c8d13c8 TD |
1015 | * Enable channel per domain |
1016 | * Returns size of returned session payload data or a negative error code. | |
a5c5a2bd | 1017 | */ |
cd80958d | 1018 | int lttng_enable_channel(struct lttng_handle *handle, |
38057ed1 | 1019 | struct lttng_channel *chan) |
a5c5a2bd | 1020 | { |
cd80958d DG |
1021 | struct lttcomm_session_msg lsm; |
1022 | ||
5117eeec DG |
1023 | /* |
1024 | * NULL arguments are forbidden. No default values. | |
1025 | */ | |
1026 | if (handle == NULL || chan == NULL) { | |
2f70b271 | 1027 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
1028 | } |
1029 | ||
441c16a7 MD |
1030 | memset(&lsm, 0, sizeof(lsm)); |
1031 | ||
5117eeec | 1032 | memcpy(&lsm.u.channel.chan, chan, sizeof(lsm.u.channel.chan)); |
7d29a247 | 1033 | |
cd80958d DG |
1034 | lsm.cmd_type = LTTNG_ENABLE_CHANNEL; |
1035 | ||
1036 | copy_lttng_domain(&lsm.domain, &handle->domain); | |
7d29a247 | 1037 | |
cd80958d DG |
1038 | copy_string(lsm.session.name, handle->session_name, |
1039 | sizeof(lsm.session.name)); | |
1040 | ||
1041 | return ask_sessiond(&lsm, NULL); | |
8c0faa1d | 1042 | } |
1df4dedd | 1043 | |
2ef84c95 | 1044 | /* |
1c8d13c8 TD |
1045 | * All tracing will be stopped for registered events of the channel. |
1046 | * Returns size of returned session payload data or a negative error code. | |
2ef84c95 | 1047 | */ |
cd80958d | 1048 | int lttng_disable_channel(struct lttng_handle *handle, const char *name) |
2ef84c95 | 1049 | { |
cd80958d DG |
1050 | struct lttcomm_session_msg lsm; |
1051 | ||
9d697d3d DG |
1052 | /* Safety check. Both are mandatory */ |
1053 | if (handle == NULL || name == NULL) { | |
2f70b271 | 1054 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
1055 | } |
1056 | ||
441c16a7 MD |
1057 | memset(&lsm, 0, sizeof(lsm)); |
1058 | ||
cd80958d | 1059 | lsm.cmd_type = LTTNG_DISABLE_CHANNEL; |
1df4dedd | 1060 | |
9d697d3d DG |
1061 | copy_string(lsm.u.disable.channel_name, name, |
1062 | sizeof(lsm.u.disable.channel_name)); | |
1063 | ||
cd80958d DG |
1064 | copy_lttng_domain(&lsm.domain, &handle->domain); |
1065 | ||
1066 | copy_string(lsm.session.name, handle->session_name, | |
1067 | sizeof(lsm.session.name)); | |
1068 | ||
1069 | return ask_sessiond(&lsm, NULL); | |
ca95a216 DG |
1070 | } |
1071 | ||
fac6795d | 1072 | /* |
1c8d13c8 TD |
1073 | * Lists all available tracepoints of domain. |
1074 | * Sets the contents of the events array. | |
1075 | * Returns the number of lttng_event entries in events; | |
1076 | * on error, returns a negative value. | |
fac6795d | 1077 | */ |
cd80958d | 1078 | int lttng_list_tracepoints(struct lttng_handle *handle, |
2a71efd5 | 1079 | struct lttng_event **events) |
fac6795d | 1080 | { |
052da939 | 1081 | int ret; |
cd80958d DG |
1082 | struct lttcomm_session_msg lsm; |
1083 | ||
9d697d3d | 1084 | if (handle == NULL) { |
2f70b271 | 1085 | return -LTTNG_ERR_INVALID; |
cd80958d | 1086 | } |
fac6795d | 1087 | |
cd80958d DG |
1088 | lsm.cmd_type = LTTNG_LIST_TRACEPOINTS; |
1089 | copy_lttng_domain(&lsm.domain, &handle->domain); | |
2a71efd5 | 1090 | |
cd80958d | 1091 | ret = ask_sessiond(&lsm, (void **) events); |
052da939 DG |
1092 | if (ret < 0) { |
1093 | return ret; | |
eb354453 | 1094 | } |
fac6795d | 1095 | |
9f19cc17 | 1096 | return ret / sizeof(struct lttng_event); |
fac6795d DG |
1097 | } |
1098 | ||
f37d259d MD |
1099 | /* |
1100 | * Lists all available tracepoint fields of domain. | |
1101 | * Sets the contents of the event field array. | |
1102 | * Returns the number of lttng_event_field entries in events; | |
1103 | * on error, returns a negative value. | |
1104 | */ | |
1105 | int lttng_list_tracepoint_fields(struct lttng_handle *handle, | |
1106 | struct lttng_event_field **fields) | |
1107 | { | |
1108 | int ret; | |
1109 | struct lttcomm_session_msg lsm; | |
1110 | ||
1111 | if (handle == NULL) { | |
2f70b271 | 1112 | return -LTTNG_ERR_INVALID; |
f37d259d MD |
1113 | } |
1114 | ||
1115 | lsm.cmd_type = LTTNG_LIST_TRACEPOINT_FIELDS; | |
1116 | copy_lttng_domain(&lsm.domain, &handle->domain); | |
1117 | ||
1118 | ret = ask_sessiond(&lsm, (void **) fields); | |
1119 | if (ret < 0) { | |
1120 | return ret; | |
1121 | } | |
1122 | ||
1123 | return ret / sizeof(struct lttng_event_field); | |
1124 | } | |
1125 | ||
1657e9bb | 1126 | /* |
1c8d13c8 TD |
1127 | * Returns a human readable string describing |
1128 | * the error code (a negative value). | |
1657e9bb | 1129 | */ |
9a745bc7 | 1130 | const char *lttng_strerror(int code) |
1657e9bb | 1131 | { |
f73fabfd | 1132 | return error_get_str(code); |
1657e9bb DG |
1133 | } |
1134 | ||
aaf97519 | 1135 | /* |
a4b92340 DG |
1136 | * Create a brand new session using name and url for destination. |
1137 | * | |
f73fabfd | 1138 | * Returns LTTNG_OK on success or a negative error code. |
00e2e675 | 1139 | */ |
a4b92340 | 1140 | int lttng_create_session(const char *name, const char *url) |
00e2e675 | 1141 | { |
a4b92340 | 1142 | ssize_t size; |
00e2e675 | 1143 | struct lttcomm_session_msg lsm; |
a4b92340 | 1144 | struct lttng_uri *uris = NULL; |
00e2e675 | 1145 | |
a4b92340 | 1146 | if (name == NULL) { |
2f70b271 | 1147 | return -LTTNG_ERR_INVALID; |
00e2e675 DG |
1148 | } |
1149 | ||
a4b92340 | 1150 | memset(&lsm, 0, sizeof(lsm)); |
00e2e675 | 1151 | |
a4b92340 | 1152 | lsm.cmd_type = LTTNG_CREATE_SESSION; |
00e2e675 | 1153 | copy_string(lsm.session.name, name, sizeof(lsm.session.name)); |
a4b92340 DG |
1154 | |
1155 | /* There should never be a data URL */ | |
1156 | size = parse_str_urls_to_uri(url, NULL, &uris); | |
1157 | if (size < 0) { | |
2f70b271 | 1158 | return -LTTNG_ERR_INVALID; |
00e2e675 DG |
1159 | } |
1160 | ||
a4b92340 DG |
1161 | lsm.u.uri.size = size; |
1162 | ||
1163 | return ask_sessiond_varlen(&lsm, uris, sizeof(struct lttng_uri) * size, | |
1164 | NULL); | |
00e2e675 DG |
1165 | } |
1166 | ||
8028d920 | 1167 | /* |
8028d920 | 1168 | * Destroy session using name. |
1c8d13c8 | 1169 | * Returns size of returned session payload data or a negative error code. |
8028d920 | 1170 | */ |
843f5df9 | 1171 | int lttng_destroy_session(const char *session_name) |
8028d920 | 1172 | { |
cd80958d DG |
1173 | struct lttcomm_session_msg lsm; |
1174 | ||
843f5df9 | 1175 | if (session_name == NULL) { |
2f70b271 | 1176 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
1177 | } |
1178 | ||
1179 | lsm.cmd_type = LTTNG_DESTROY_SESSION; | |
843f5df9 DG |
1180 | |
1181 | copy_string(lsm.session.name, session_name, sizeof(lsm.session.name)); | |
cd80958d DG |
1182 | |
1183 | return ask_sessiond(&lsm, NULL); | |
aaf97519 DG |
1184 | } |
1185 | ||
57167058 | 1186 | /* |
57167058 | 1187 | * Ask the session daemon for all available sessions. |
1c8d13c8 TD |
1188 | * Sets the contents of the sessions array. |
1189 | * Returns the number of lttng_session entries in sessions; | |
1190 | * on error, returns a negative value. | |
57167058 | 1191 | */ |
ca95a216 | 1192 | int lttng_list_sessions(struct lttng_session **sessions) |
57167058 | 1193 | { |
ca95a216 | 1194 | int ret; |
cd80958d | 1195 | struct lttcomm_session_msg lsm; |
57167058 | 1196 | |
cd80958d DG |
1197 | lsm.cmd_type = LTTNG_LIST_SESSIONS; |
1198 | ret = ask_sessiond(&lsm, (void**) sessions); | |
57167058 | 1199 | if (ret < 0) { |
ca95a216 | 1200 | return ret; |
57167058 DG |
1201 | } |
1202 | ||
ca95a216 | 1203 | return ret / sizeof(struct lttng_session); |
57167058 DG |
1204 | } |
1205 | ||
9f19cc17 | 1206 | /* |
1c8d13c8 TD |
1207 | * Ask the session daemon for all available domains of a session. |
1208 | * Sets the contents of the domains array. | |
1209 | * Returns the number of lttng_domain entries in domains; | |
1210 | * on error, returns a negative value. | |
9f19cc17 | 1211 | */ |
330be774 | 1212 | int lttng_list_domains(const char *session_name, |
cd80958d | 1213 | struct lttng_domain **domains) |
9f19cc17 DG |
1214 | { |
1215 | int ret; | |
cd80958d DG |
1216 | struct lttcomm_session_msg lsm; |
1217 | ||
330be774 | 1218 | if (session_name == NULL) { |
2f70b271 | 1219 | return -LTTNG_ERR_INVALID; |
cd80958d | 1220 | } |
9f19cc17 | 1221 | |
cd80958d DG |
1222 | lsm.cmd_type = LTTNG_LIST_DOMAINS; |
1223 | ||
330be774 | 1224 | copy_string(lsm.session.name, session_name, sizeof(lsm.session.name)); |
cd80958d DG |
1225 | |
1226 | ret = ask_sessiond(&lsm, (void**) domains); | |
9f19cc17 DG |
1227 | if (ret < 0) { |
1228 | return ret; | |
1229 | } | |
1230 | ||
1231 | return ret / sizeof(struct lttng_domain); | |
1232 | } | |
1233 | ||
1234 | /* | |
1c8d13c8 TD |
1235 | * Ask the session daemon for all available channels of a session. |
1236 | * Sets the contents of the channels array. | |
1237 | * Returns the number of lttng_channel entries in channels; | |
1238 | * on error, returns a negative value. | |
9f19cc17 | 1239 | */ |
cd80958d DG |
1240 | int lttng_list_channels(struct lttng_handle *handle, |
1241 | struct lttng_channel **channels) | |
9f19cc17 DG |
1242 | { |
1243 | int ret; | |
cd80958d DG |
1244 | struct lttcomm_session_msg lsm; |
1245 | ||
9d697d3d | 1246 | if (handle == NULL) { |
2f70b271 | 1247 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
1248 | } |
1249 | ||
1250 | lsm.cmd_type = LTTNG_LIST_CHANNELS; | |
1251 | copy_string(lsm.session.name, handle->session_name, | |
1252 | sizeof(lsm.session.name)); | |
9f19cc17 | 1253 | |
cd80958d | 1254 | copy_lttng_domain(&lsm.domain, &handle->domain); |
9f19cc17 | 1255 | |
cd80958d | 1256 | ret = ask_sessiond(&lsm, (void**) channels); |
9f19cc17 DG |
1257 | if (ret < 0) { |
1258 | return ret; | |
1259 | } | |
1260 | ||
1261 | return ret / sizeof(struct lttng_channel); | |
1262 | } | |
1263 | ||
1264 | /* | |
1c8d13c8 TD |
1265 | * Ask the session daemon for all available events of a session channel. |
1266 | * Sets the contents of the events array. | |
1267 | * Returns the number of lttng_event entries in events; | |
1268 | * on error, returns a negative value. | |
9f19cc17 | 1269 | */ |
cd80958d DG |
1270 | int lttng_list_events(struct lttng_handle *handle, |
1271 | const char *channel_name, struct lttng_event **events) | |
9f19cc17 DG |
1272 | { |
1273 | int ret; | |
cd80958d | 1274 | struct lttcomm_session_msg lsm; |
9f19cc17 | 1275 | |
9d697d3d DG |
1276 | /* Safety check. An handle and channel name are mandatory */ |
1277 | if (handle == NULL || channel_name == NULL) { | |
2f70b271 | 1278 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
1279 | } |
1280 | ||
1281 | lsm.cmd_type = LTTNG_LIST_EVENTS; | |
1282 | copy_string(lsm.session.name, handle->session_name, | |
1283 | sizeof(lsm.session.name)); | |
1284 | copy_string(lsm.u.list.channel_name, channel_name, | |
1285 | sizeof(lsm.u.list.channel_name)); | |
1286 | ||
1287 | copy_lttng_domain(&lsm.domain, &handle->domain); | |
9f19cc17 | 1288 | |
cd80958d | 1289 | ret = ask_sessiond(&lsm, (void**) events); |
9f19cc17 DG |
1290 | if (ret < 0) { |
1291 | return ret; | |
1292 | } | |
1293 | ||
1294 | return ret / sizeof(struct lttng_event); | |
1295 | } | |
1296 | ||
fac6795d | 1297 | /* |
1c8d13c8 TD |
1298 | * Sets the tracing_group variable with name. |
1299 | * This function allocates memory pointed to by tracing_group. | |
1300 | * On success, returns 0, on error, returns -1 (null name) or -ENOMEM. | |
fac6795d DG |
1301 | */ |
1302 | int lttng_set_tracing_group(const char *name) | |
1303 | { | |
9d697d3d | 1304 | if (name == NULL) { |
2f70b271 | 1305 | return -LTTNG_ERR_INVALID; |
9d697d3d DG |
1306 | } |
1307 | ||
fac6795d | 1308 | if (asprintf(&tracing_group, "%s", name) < 0) { |
2f70b271 | 1309 | return -LTTNG_ERR_FATAL; |
fac6795d DG |
1310 | } |
1311 | ||
1312 | return 0; | |
1313 | } | |
1314 | ||
d0254c7c | 1315 | /* |
af87c45a | 1316 | * Returns size of returned session payload data or a negative error code. |
d0254c7c | 1317 | */ |
cd80958d | 1318 | int lttng_calibrate(struct lttng_handle *handle, |
d0254c7c MD |
1319 | struct lttng_calibrate *calibrate) |
1320 | { | |
cd80958d | 1321 | struct lttcomm_session_msg lsm; |
d0254c7c | 1322 | |
9d697d3d DG |
1323 | /* Safety check. NULL pointer are forbidden */ |
1324 | if (handle == NULL || calibrate == NULL) { | |
2f70b271 | 1325 | return -LTTNG_ERR_INVALID; |
cd80958d | 1326 | } |
d0254c7c | 1327 | |
cd80958d DG |
1328 | lsm.cmd_type = LTTNG_CALIBRATE; |
1329 | copy_lttng_domain(&lsm.domain, &handle->domain); | |
d0254c7c | 1330 | |
cd80958d DG |
1331 | memcpy(&lsm.u.calibrate, calibrate, sizeof(lsm.u.calibrate)); |
1332 | ||
1333 | return ask_sessiond(&lsm, NULL); | |
d0254c7c MD |
1334 | } |
1335 | ||
5edd7e09 DG |
1336 | /* |
1337 | * Set default channel attributes. | |
441c16a7 | 1338 | * If either or both of the arguments are null, attr content is zeroe'd. |
5edd7e09 DG |
1339 | */ |
1340 | void lttng_channel_set_default_attr(struct lttng_domain *domain, | |
1341 | struct lttng_channel_attr *attr) | |
1342 | { | |
1343 | /* Safety check */ | |
1344 | if (attr == NULL || domain == NULL) { | |
1345 | return; | |
1346 | } | |
1347 | ||
eacaa7a6 DS |
1348 | memset(attr, 0, sizeof(struct lttng_channel_attr)); |
1349 | ||
5edd7e09 DG |
1350 | switch (domain->type) { |
1351 | case LTTNG_DOMAIN_KERNEL: | |
1352 | attr->overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
1353 | attr->switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER; | |
1354 | attr->read_timer_interval = DEFAULT_CHANNEL_READ_TIMER; | |
1355 | ||
3e230f92 | 1356 | attr->subbuf_size = default_get_kernel_channel_subbuf_size(); |
5edd7e09 DG |
1357 | attr->num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM; |
1358 | attr->output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
1359 | break; | |
1360 | case LTTNG_DOMAIN_UST: | |
d78d6610 | 1361 | #if 0 |
5edd7e09 DG |
1362 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
1363 | case LTTNG_DOMAIN_UST_PID: | |
1364 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 1365 | #endif |
5edd7e09 DG |
1366 | attr->overwrite = DEFAULT_CHANNEL_OVERWRITE; |
1367 | attr->switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER; | |
1368 | attr->read_timer_interval = DEFAULT_CHANNEL_READ_TIMER; | |
1369 | ||
3e230f92 | 1370 | attr->subbuf_size = default_get_ust_channel_subbuf_size(); |
5edd7e09 DG |
1371 | attr->num_subbuf = DEFAULT_UST_CHANNEL_SUBBUF_NUM; |
1372 | attr->output = DEFAULT_UST_CHANNEL_OUTPUT; | |
1373 | break; | |
1374 | default: | |
441c16a7 | 1375 | /* Default behavior: leave set to 0. */ |
5edd7e09 DG |
1376 | break; |
1377 | } | |
1378 | } | |
1379 | ||
fac6795d | 1380 | /* |
2269e89e | 1381 | * Check if session daemon is alive. |
fac6795d | 1382 | * |
2269e89e | 1383 | * Return 1 if alive or 0 if not. |
1c8d13c8 | 1384 | * On error returns a negative value. |
fac6795d | 1385 | */ |
947308c4 | 1386 | int lttng_session_daemon_alive(void) |
fac6795d DG |
1387 | { |
1388 | int ret; | |
1389 | ||
1390 | ret = set_session_daemon_path(); | |
1391 | if (ret < 0) { | |
947308c4 | 1392 | /* Error */ |
fac6795d DG |
1393 | return ret; |
1394 | } | |
1395 | ||
2269e89e | 1396 | if (strlen(sessiond_sock_path) == 0) { |
2f70b271 DG |
1397 | /* |
1398 | * No socket path set. Weird error which means the constructor was not | |
1399 | * called. | |
1400 | */ | |
1401 | assert(0); | |
fac6795d DG |
1402 | } |
1403 | ||
2269e89e | 1404 | ret = try_connect_sessiond(sessiond_sock_path); |
7d8234d9 MD |
1405 | if (ret < 0) { |
1406 | /* Not alive */ | |
1407 | return 0; | |
1408 | } | |
7d8234d9 | 1409 | |
947308c4 DG |
1410 | /* Is alive */ |
1411 | return 1; | |
fac6795d DG |
1412 | } |
1413 | ||
00e2e675 | 1414 | /* |
a4b92340 | 1415 | * Set URL for a consumer for a session and domain. |
00e2e675 DG |
1416 | * |
1417 | * Return 0 on success, else a negative value. | |
1418 | */ | |
a4b92340 DG |
1419 | int lttng_set_consumer_url(struct lttng_handle *handle, |
1420 | const char *control_url, const char *data_url) | |
00e2e675 | 1421 | { |
a4b92340 | 1422 | ssize_t size; |
00e2e675 | 1423 | struct lttcomm_session_msg lsm; |
a4b92340 | 1424 | struct lttng_uri *uris = NULL; |
00e2e675 | 1425 | |
a4b92340 | 1426 | if (handle == NULL || (control_url == NULL && data_url == NULL)) { |
2f70b271 | 1427 | return -LTTNG_ERR_INVALID; |
00e2e675 DG |
1428 | } |
1429 | ||
a4b92340 DG |
1430 | memset(&lsm, 0, sizeof(lsm)); |
1431 | ||
00e2e675 DG |
1432 | lsm.cmd_type = LTTNG_SET_CONSUMER_URI; |
1433 | ||
1434 | copy_string(lsm.session.name, handle->session_name, | |
1435 | sizeof(lsm.session.name)); | |
1436 | copy_lttng_domain(&lsm.domain, &handle->domain); | |
1437 | ||
a4b92340 DG |
1438 | size = parse_str_urls_to_uri(control_url, data_url, &uris); |
1439 | if (size < 0) { | |
2f70b271 | 1440 | return -LTTNG_ERR_INVALID; |
a4b92340 DG |
1441 | } |
1442 | ||
1443 | lsm.u.uri.size = size; | |
00e2e675 | 1444 | |
a4b92340 DG |
1445 | return ask_sessiond_varlen(&lsm, uris, sizeof(struct lttng_uri) * size, |
1446 | NULL); | |
00e2e675 DG |
1447 | } |
1448 | ||
1449 | /* | |
1450 | * Enable consumer for a session and domain. | |
1451 | * | |
1452 | * Return 0 on success, else a negative value. | |
1453 | */ | |
1454 | int lttng_enable_consumer(struct lttng_handle *handle) | |
1455 | { | |
1456 | struct lttcomm_session_msg lsm; | |
1457 | ||
1458 | if (handle == NULL) { | |
2f70b271 | 1459 | return -LTTNG_ERR_INVALID; |
00e2e675 DG |
1460 | } |
1461 | ||
1462 | lsm.cmd_type = LTTNG_ENABLE_CONSUMER; | |
1463 | ||
1464 | copy_string(lsm.session.name, handle->session_name, | |
1465 | sizeof(lsm.session.name)); | |
1466 | copy_lttng_domain(&lsm.domain, &handle->domain); | |
1467 | ||
1468 | return ask_sessiond(&lsm, NULL); | |
1469 | } | |
1470 | ||
1471 | /* | |
1472 | * Disable consumer for a session and domain. | |
1473 | * | |
1474 | * Return 0 on success, else a negative value. | |
1475 | */ | |
1476 | int lttng_disable_consumer(struct lttng_handle *handle) | |
1477 | { | |
1478 | struct lttcomm_session_msg lsm; | |
1479 | ||
1480 | if (handle == NULL) { | |
2f70b271 | 1481 | return -LTTNG_ERR_INVALID; |
00e2e675 DG |
1482 | } |
1483 | ||
1484 | lsm.cmd_type = LTTNG_DISABLE_CONSUMER; | |
1485 | ||
1486 | copy_string(lsm.session.name, handle->session_name, | |
1487 | sizeof(lsm.session.name)); | |
1488 | copy_lttng_domain(&lsm.domain, &handle->domain); | |
1489 | ||
1490 | return ask_sessiond(&lsm, NULL); | |
1491 | } | |
1492 | ||
44a5e5eb DG |
1493 | /* |
1494 | * Set health socket path by putting it in the global health_sock_path | |
1495 | * variable. | |
1496 | * | |
1497 | * Returns 0 on success or assert(0) on ENOMEM. | |
1498 | */ | |
1499 | static int set_health_socket_path(void) | |
1500 | { | |
44a5e5eb DG |
1501 | int in_tgroup = 0; /* In tracing group */ |
1502 | uid_t uid; | |
1503 | const char *home; | |
1504 | ||
1505 | uid = getuid(); | |
1506 | ||
1507 | if (uid != 0) { | |
1508 | /* Are we in the tracing group ? */ | |
1509 | in_tgroup = check_tracing_group(tracing_group); | |
1510 | } | |
1511 | ||
1512 | if ((uid == 0) || in_tgroup) { | |
1513 | copy_string(health_sock_path, DEFAULT_GLOBAL_HEALTH_UNIX_SOCK, | |
1514 | sizeof(health_sock_path)); | |
1515 | } | |
1516 | ||
1517 | if (uid != 0) { | |
c617c0c6 MD |
1518 | int ret; |
1519 | ||
44a5e5eb DG |
1520 | /* |
1521 | * With GNU C < 2.1, snprintf returns -1 if the target buffer is too small; | |
1522 | * With GNU C >= 2.1, snprintf returns the required size (excluding closing null) | |
1523 | */ | |
1524 | home = getenv("HOME"); | |
1525 | if (home == NULL) { | |
1526 | /* Fallback in /tmp .. */ | |
1527 | home = "/tmp"; | |
1528 | } | |
1529 | ||
1530 | ret = snprintf(health_sock_path, sizeof(health_sock_path), | |
1531 | DEFAULT_HOME_HEALTH_UNIX_SOCK, home); | |
1532 | if ((ret < 0) || (ret >= sizeof(health_sock_path))) { | |
1533 | /* ENOMEM at this point... just kill the control lib. */ | |
1534 | assert(0); | |
1535 | } | |
1536 | } | |
1537 | ||
1538 | return 0; | |
1539 | } | |
1540 | ||
1541 | /* | |
1542 | * Check session daemon health for a specific health component. | |
1543 | * | |
2f70b271 | 1544 | * Return 0 if health is OK or else 1 if BAD. |
44a5e5eb | 1545 | * |
2f70b271 | 1546 | * Any other negative value is a lttng error code which can be translated with |
44a5e5eb DG |
1547 | * lttng_strerror(). |
1548 | */ | |
1549 | int lttng_health_check(enum lttng_health_component c) | |
1550 | { | |
1551 | int sock, ret; | |
1552 | struct lttcomm_health_msg msg; | |
1553 | struct lttcomm_health_data reply; | |
1554 | ||
1555 | /* Connect to the sesssion daemon */ | |
1556 | sock = lttcomm_connect_unix_sock(health_sock_path); | |
1557 | if (sock < 0) { | |
2f70b271 | 1558 | ret = -LTTNG_ERR_NO_SESSIOND; |
44a5e5eb DG |
1559 | goto error; |
1560 | } | |
1561 | ||
1562 | msg.cmd = LTTNG_HEALTH_CHECK; | |
1563 | msg.component = c; | |
1564 | ||
1565 | ret = lttcomm_send_unix_sock(sock, (void *)&msg, sizeof(msg)); | |
1566 | if (ret < 0) { | |
2f70b271 | 1567 | ret = -LTTNG_ERR_FATAL; |
44a5e5eb DG |
1568 | goto close_error; |
1569 | } | |
1570 | ||
1571 | ret = lttcomm_recv_unix_sock(sock, (void *)&reply, sizeof(reply)); | |
1572 | if (ret < 0) { | |
2f70b271 | 1573 | ret = -LTTNG_ERR_FATAL; |
44a5e5eb DG |
1574 | goto close_error; |
1575 | } | |
1576 | ||
1577 | ret = reply.ret_code; | |
1578 | ||
1579 | close_error: | |
1580 | close(sock); | |
1581 | ||
1582 | error: | |
1583 | return ret; | |
1584 | } | |
1585 | ||
07424f16 DG |
1586 | /* |
1587 | * This is an extension of create session that is ONLY and SHOULD only be used | |
1588 | * by the lttng command line program. It exists to avoid using URI parsing in | |
1589 | * the lttng client. | |
1590 | * | |
1591 | * We need the date and time for the trace path subdirectory for the case where | |
1592 | * the user does NOT define one using either -o or -U. Using the normal | |
1593 | * lttng_create_session API call, we have no clue on the session daemon side if | |
1594 | * the URL was generated automatically by the client or define by the user. | |
1595 | * | |
1596 | * So this function "wrapper" is hidden from the public API, takes the datetime | |
1597 | * string and appends it if necessary to the URI subdirectory before sending it | |
1598 | * to the session daemon. | |
1599 | * | |
1600 | * With this extra function, the lttng_create_session call behavior is not | |
1601 | * changed and the timestamp is appended to the URI on the session daemon side | |
1602 | * if necessary. | |
1603 | */ | |
1604 | int _lttng_create_session_ext(const char *name, const char *url, | |
1605 | const char *datetime) | |
1606 | { | |
07424f16 DG |
1607 | ssize_t size; |
1608 | struct lttcomm_session_msg lsm; | |
1609 | struct lttng_uri *uris = NULL; | |
1610 | ||
1611 | if (name == NULL || datetime == NULL) { | |
2f70b271 | 1612 | return -LTTNG_ERR_INVALID; |
07424f16 DG |
1613 | } |
1614 | ||
1615 | memset(&lsm, 0, sizeof(lsm)); | |
1616 | ||
1617 | lsm.cmd_type = LTTNG_CREATE_SESSION; | |
04965770 | 1618 | copy_string(lsm.session.name, name, sizeof(lsm.session.name)); |
07424f16 DG |
1619 | |
1620 | /* There should never be a data URL */ | |
1621 | size = parse_str_urls_to_uri(url, NULL, &uris); | |
1622 | if (size < 0) { | |
2f70b271 | 1623 | return -LTTNG_ERR_INVALID; |
07424f16 DG |
1624 | } |
1625 | ||
1626 | lsm.u.uri.size = size; | |
1627 | ||
4b35a6b3 | 1628 | if (size > 0 && uris[0].dtype != LTTNG_DST_PATH && strlen(uris[0].subdir) == 0) { |
c617c0c6 MD |
1629 | int ret; |
1630 | ||
ad20f474 | 1631 | ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s-%s", name, |
07424f16 DG |
1632 | datetime); |
1633 | if (ret < 0) { | |
1634 | PERROR("snprintf uri subdir"); | |
2f70b271 | 1635 | return -LTTNG_ERR_FATAL; |
07424f16 DG |
1636 | } |
1637 | } | |
1638 | ||
1639 | return ask_sessiond_varlen(&lsm, uris, sizeof(struct lttng_uri) * size, | |
1640 | NULL); | |
1641 | } | |
1642 | ||
806e2684 DG |
1643 | /* |
1644 | * For a given session name, this call checks if the data is ready to be read | |
1645 | * or is still being extracted by the consumer(s) hence not ready to be used by | |
1646 | * any readers. | |
1647 | */ | |
6d805429 | 1648 | int lttng_data_pending(const char *session_name) |
806e2684 DG |
1649 | { |
1650 | int ret; | |
1651 | struct lttcomm_session_msg lsm; | |
1652 | ||
1653 | if (session_name == NULL) { | |
1654 | return -LTTNG_ERR_INVALID; | |
1655 | } | |
1656 | ||
6d805429 | 1657 | lsm.cmd_type = LTTNG_DATA_PENDING; |
806e2684 DG |
1658 | |
1659 | copy_string(lsm.session.name, session_name, sizeof(lsm.session.name)); | |
1660 | ||
1661 | ret = ask_sessiond(&lsm, NULL); | |
1662 | ||
1663 | /* | |
1664 | * The ask_sessiond function negate the return code if it's not LTTNG_OK so | |
1665 | * getting -1 means that the reply ret_code was 1 thus meaning that the | |
1666 | * data is available. Yes it is hackish but for now this is the only way. | |
1667 | */ | |
1668 | if (ret == -1) { | |
1669 | ret = 1; | |
1670 | } | |
1671 | ||
1672 | return ret; | |
1673 | } | |
1674 | ||
fac6795d DG |
1675 | /* |
1676 | * lib constructor | |
1677 | */ | |
1678 | static void __attribute__((constructor)) init() | |
1679 | { | |
1680 | /* Set default session group */ | |
bbccc3d2 | 1681 | lttng_set_tracing_group(DEFAULT_TRACING_GROUP); |
44a5e5eb DG |
1682 | /* Set socket for health check */ |
1683 | (void) set_health_socket_path(); | |
fac6795d | 1684 | } |
49cca668 DG |
1685 | |
1686 | /* | |
1687 | * lib destructor | |
1688 | */ | |
1689 | static void __attribute__((destructor)) lttng_ctl_exit() | |
1690 | { | |
1691 | free(tracing_group); | |
1692 | } |