--- /dev/null
+/*
+ * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
+ * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#define _GNU_SOURCE
+#include <fcntl.h>
+#include <getopt.h>
+#include <grp.h>
+#include <limits.h>
+#include <pthread.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/ipc.h>
+#include <sys/shm.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <urcu/list.h>
+#include <poll.h>
+#include <unistd.h>
+
+#include "lttngerr.h"
+#include "libkernelctl.h"
+#include "liblttsessiondcomm.h"
+#include "kconsumerd.h"
+
+/* Init the list of FDs */
+static struct ltt_kconsumerd_fd_list kconsumerd_fd_list = {
+ .head = CDS_LIST_HEAD_INIT(kconsumerd_fd_list.head),
+};
+
+/* Number of element for the list below. */
+static unsigned int fds_count;
+
+/* If the local array of FDs needs update in the poll function */
+static unsigned int update_fd_array = 1;
+
+/* lock the fd array and structures */
+static pthread_mutex_t kconsumerd_lock_fds;
+
+/* the two threads (receive fd and poll) */
+static pthread_t threads[2];
+
+/* communication with splice */
+static int thread_pipe[2];
+
+/* socket to communicate errors with sessiond */
+static int error_socket = -1;
+
+/* Argument variables */
+int opt_quiet;
+int opt_verbose;
+static int opt_daemon;
+static const char *progname;
+static char command_sock_path[PATH_MAX]; /* Global command socket path */
+static char error_sock_path[PATH_MAX]; /* Global error path */
+
+/*
+ * cleanup
+ *
+ * Cleanup the daemon's socket on exit
+ */
+static void cleanup()
+{
+ unlink(command_sock_path);
+}
+
+/* send_error
+ *
+ * send return code to ltt-sessiond
+ */
+static int send_error(enum lttcomm_return_code cmd)
+{
+ if (error_socket > 0) {
+ return lttcomm_send_unix_sock(error_socket, &cmd,
+ sizeof(enum lttcomm_sessiond_command));
+ } else {
+ return 0;
+ }
+}
+
+/*
+ * cleanup_kconsumerd_fd
+ *
+ * Close the FDs and frees a ltt_kconsumerd_fd struct
+ */
+static void cleanup_kconsumerd_fd(struct ltt_kconsumerd_fd *lcf)
+{
+ if (lcf != NULL) {
+ close(lcf->out_fd);
+ close(lcf->consumerd_fd);
+ free(lcf);
+ lcf = NULL;
+ }
+}
+
+/*
+ * add_fd
+ *
+ * Add a fd to the global list protected by a mutex
+ */
+static int add_fd(struct lttcomm_kconsumerd_msg *buf, int consumerd_fd)
+{
+ struct ltt_kconsumerd_fd *tmp_fd;
+ int ret;
+
+ tmp_fd = malloc(sizeof(struct ltt_kconsumerd_fd));
+ tmp_fd->sessiond_fd = buf->fd;
+ tmp_fd->consumerd_fd = consumerd_fd;
+ tmp_fd->state = buf->state;
+ tmp_fd->max_sb_size = buf->max_sb_size;
+ strncpy(tmp_fd->path_name, buf->path_name, PATH_MAX);
+
+ /* Opening the tracefile in write mode */
+ DBG("Opening %s for writing", tmp_fd->path_name);
+ ret = open(tmp_fd->path_name,
+ O_WRONLY|O_CREAT, S_IRWXU|S_IRWXG|S_IRWXO);
+ if (ret < 0) {
+ ERR("Opening %s", tmp_fd->path_name);
+ perror("open");
+ goto end;
+ }
+ tmp_fd->out_fd = ret;
+ tmp_fd->out_fd_offset = 0;
+
+ DBG("Adding %s (%d, %d, %d)", tmp_fd->path_name,
+ tmp_fd->sessiond_fd, tmp_fd->consumerd_fd, tmp_fd->out_fd);
+
+ pthread_mutex_lock(&kconsumerd_lock_fds);
+ cds_list_add(&tmp_fd->list, &kconsumerd_fd_list.head);
+ fds_count++;
+ pthread_mutex_unlock(&kconsumerd_lock_fds);
+
+end:
+ return ret;
+}
+
+/*
+ * del_fd
+ *
+ * Remove a fd from the global list protected by a mutex
+ */
+static void del_fd(struct ltt_kconsumerd_fd *lcf)
+{
+ pthread_mutex_lock(&kconsumerd_lock_fds);
+ cds_list_del(&lcf->list);
+ if (fds_count > 0) {
+ fds_count--;
+ DBG("Removed ltt_kconsumerd_fd");
+ cleanup_kconsumerd_fd(lcf);
+ }
+ pthread_mutex_unlock(&kconsumerd_lock_fds);
+}
+
+/*
+ * close_outfds
+ *
+ * Close all fds in the previous fd_list
+ * Must be used with kconsumerd_lock_fds lock held
+ */
+static void close_outfds()
+{
+ struct ltt_kconsumerd_fd *iter;
+ cds_list_for_each_entry(iter, &kconsumerd_fd_list.head, list) {
+ del_fd(iter);
+ }
+}
+
+/*
+ * sighandler
+ *
+ * Signal handler for the daemon
+ */
+static void sighandler(int sig)
+{
+ /* unblock the threads */
+ pthread_cancel(threads[0]);
+ pthread_cancel(threads[1]);
+
+ close_outfds();
+ cleanup();
+
+ return;
+}
+
+/*
+ * set_signal_handler
+ *
+ * Setup signal handler for :
+ * SIGINT, SIGTERM, SIGPIPE
+ */
+static int set_signal_handler(void)
+{
+ int ret = 0;
+ struct sigaction sa;
+ sigset_t sigset;
+
+ if ((ret = sigemptyset(&sigset)) < 0) {
+ perror("sigemptyset");
+ return ret;
+ }
+
+ sa.sa_handler = sighandler;
+ sa.sa_mask = sigset;
+ sa.sa_flags = 0;
+ if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
+ perror("sigaction");
+ return ret;
+ }
+
+ if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
+ perror("sigaction");
+ return ret;
+ }
+
+ if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
+ perror("sigaction");
+ return ret;
+ }
+
+ return ret;
+}
+
+/*
+ * on_read_subbuffer
+ *
+ * Splice the data from the ring buffer to the tracefile.
+ * Returns the number of bytes spliced
+ */
+static int on_read_subbuffer(struct ltt_kconsumerd_fd *kconsumerd_fd,
+ unsigned long len)
+{
+ long ret = 0;
+ loff_t offset = 0;
+ off_t orig_offset = kconsumerd_fd->out_fd_offset;
+ int fd = kconsumerd_fd->consumerd_fd;
+ int outfd = kconsumerd_fd->out_fd;
+
+ while (len > 0) {
+ DBG("splice chan to pipe offset %lu (fd : %d)",
+ (unsigned long)offset, fd);
+ ret = splice(fd, &offset, thread_pipe[1], NULL, len,
+ SPLICE_F_MOVE | SPLICE_F_MORE);
+ DBG("splice chan to pipe ret %ld", ret);
+ if (ret < 0) {
+ perror("Error in relay splice");
+ goto write_end;
+ }
+
+ ret = splice(thread_pipe[0], NULL, outfd, NULL, ret,
+ SPLICE_F_MOVE | SPLICE_F_MORE);
+ DBG("splice pipe to file %ld", ret);
+ if (ret < 0) {
+ perror("Error in file splice");
+ goto write_end;
+ }
+ if (ret >= len) {
+ len = 0;
+ }
+ /* This won't block, but will start writeout asynchronously */
+ sync_file_range(outfd, kconsumerd_fd->out_fd_offset, ret,
+ SYNC_FILE_RANGE_WRITE);
+ kconsumerd_fd->out_fd_offset += ret;
+ }
+write_end:
+ /*
+ * This does a blocking write-and-wait on any page that belongs to the
+ * subbuffer prior to the one we just wrote.
+ * Don't care about error values, as these are just hints and ways to
+ * limit the amount of page cache used.
+ */
+ if (orig_offset >= kconsumerd_fd->max_sb_size) {
+ sync_file_range(outfd, orig_offset - kconsumerd_fd->max_sb_size,
+ kconsumerd_fd->max_sb_size,
+ SYNC_FILE_RANGE_WAIT_BEFORE
+ | SYNC_FILE_RANGE_WRITE
+ | SYNC_FILE_RANGE_WAIT_AFTER);
+ /*
+ * Give hints to the kernel about how we access the file:
+ * POSIX_FADV_DONTNEED : we won't re-access data in a near
+ * future after we write it.
+ * We need to call fadvise again after the file grows because
+ * the kernel does not seem to apply fadvise to non-existing
+ * parts of the file.
+ * Call fadvise _after_ having waited for the page writeback to
+ * complete because the dirty page writeback semantic is not
+ * well defined. So it can be expected to lead to lower
+ * throughput in streaming.
+ */
+ posix_fadvise(outfd, orig_offset - kconsumerd_fd->max_sb_size,
+ kconsumerd_fd->max_sb_size, POSIX_FADV_DONTNEED);
+ }
+ return ret;
+}
+
+/*
+ * read_subbuffer
+ *
+ * Consume data on a file descriptor and write it on a trace file
+ */
+static int read_subbuffer(struct ltt_kconsumerd_fd *kconsumerd_fd)
+{
+ unsigned long len;
+ int err;
+ long ret = 0;
+ int infd = kconsumerd_fd->consumerd_fd;
+
+ DBG("In read_subbuffer");
+ /* Get the next subbuffer */
+ err = kernctl_get_next_subbuf(infd);
+ if (err != 0) {
+ ret = errno;
+ perror("Reserving sub buffer failed (everything is normal, "
+ "it is due to concurrency)");
+ goto end;
+ }
+
+ /* read the whole subbuffer */
+ err = kernctl_get_padded_subbuf_size(infd, &len);
+ if (err != 0) {
+ ret = errno;
+ perror("Getting sub-buffer len failed.");
+ goto end;
+ }
+
+ /* splice the subbuffer to the tracefile */
+ ret = on_read_subbuffer(kconsumerd_fd, len);
+ if (ret < 0) {
+ /*
+ * display the error but continue processing to try
+ * to release the subbuffer
+ */
+ ERR("Error splicing to tracefile");
+ }
+
+ err = kernctl_put_next_subbuf(infd);
+ if (err != 0) {
+ ret = errno;
+ if (errno == EFAULT) {
+ perror("Error in unreserving sub buffer\n");
+ } else if (errno == EIO) {
+ /* Should never happen with newer LTTng versions */
+ perror("Reader has been pushed by the writer, last sub-buffer corrupted.");
+ }
+ goto end;
+ }
+
+end:
+ return ret;
+}
+
+/*
+ * change_fd_state
+ *
+ * Update a fd according to what we just received
+ */
+static void change_fd_state(int sessiond_fd,
+ enum lttcomm_kconsumerd_fd_state state)
+{
+ struct ltt_kconsumerd_fd *iter;
+ cds_list_for_each_entry(iter, &kconsumerd_fd_list.head, list) {
+ if (iter->sessiond_fd == sessiond_fd) {
+ iter->state = state;
+ break;
+ }
+ }
+}
+
+/*
+ * consumerd_recv_fd
+ *
+ * Receives an array of file descriptors and the associated
+ * structures describing each fd (path name).
+ * Returns the size of received data
+ */
+static int consumerd_recv_fd(int sfd, int size,
+ enum lttcomm_consumerd_command cmd_type)
+{
+ struct msghdr msg;
+ struct iovec iov[1];
+ int ret, i;
+ struct cmsghdr *cmsg;
+ int nb_fd;
+ char tmp[CMSG_SPACE(size)];
+ struct lttcomm_kconsumerd_msg *buf;
+ /* the number of fds we are about to receive */
+ nb_fd = size/sizeof(struct lttcomm_kconsumerd_msg);
+
+ buf = malloc(size);
+
+ memset(&msg, 0, sizeof(msg));
+
+ /* Prepare to receive the structures */
+ iov[0].iov_base = buf;
+ iov[0].iov_len = size;
+ msg.msg_iov = iov;
+ msg.msg_iovlen = 1;
+
+ msg.msg_control = tmp;
+ msg.msg_controllen = sizeof(tmp);
+
+ DBG("Waiting to receive fds");
+ if ((ret = recvmsg(sfd, &msg, 0)) < 0) {
+ perror("recvmsg");
+ }
+ if (ret != size) {
+ ERR("Received only %d, expected %d", ret, size);
+ send_error(KCONSUMERD_ERROR_RECV_FD);
+ goto end;
+ }
+
+ cmsg = CMSG_FIRSTHDR(&msg);
+ if (!cmsg) {
+ ERR("Invalid control message header");
+ ret = -1;
+ send_error(KCONSUMERD_ERROR_RECV_FD);
+ goto end;
+ }
+
+ /* if we received fds */
+ if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_RIGHTS) {
+ DBG("Receive : expecting %d fds", nb_fd);
+ for (i = 0; i < nb_fd; i++) {
+ switch (cmd_type) {
+ case LTTCOMM_ADD_STREAM:
+ DBG("add_fd %s (%d)", buf[i].path_name, ((int *)CMSG_DATA(cmsg))[i]);
+ ret = add_fd(&buf[i], ((int *)CMSG_DATA(cmsg))[i]);
+ if (ret < 0) {
+ send_error(KCONSUMERD_OUTFD_ERROR);
+ goto end;
+ }
+ break;
+ case LTTCOMM_UPDATE_STREAM:
+ change_fd_state(buf[i].fd, buf[i].state);
+ break;
+ default:
+ break;
+ }
+ }
+ /* flag to tell the polling thread to update its fd array */
+ update_fd_array = 1;
+ send_error(KCONSUMERD_SUCCESS_RECV_FD);
+ } else {
+ ERR("Didn't received any fd");
+ send_error(KCONSUMERD_ERROR_RECV_FD);
+ ret = -1;
+ goto end;
+ }
+
+end:
+ if (buf != NULL) {
+ free(buf);
+ buf = NULL;
+ }
+ return ret;
+}
+
+/*
+ * thread_receive_fds
+ *
+ * This thread listens on the consumerd socket and
+ * receives the file descriptors from ltt-sessiond
+ */
+static void *thread_receive_fds(void *data)
+{
+ int sock, client_socket, ret;
+ struct lttcomm_kconsumerd_header tmp;
+
+ DBG("Creating command socket %s", command_sock_path);
+ unlink(command_sock_path);
+ client_socket = lttcomm_create_unix_sock(command_sock_path);
+ if (client_socket < 0) {
+ ERR("Cannot create command socket");
+ goto error;
+ }
+
+ ret = lttcomm_listen_unix_sock(client_socket);
+ if (ret < 0) {
+ goto error;
+ }
+
+ DBG("Sending ready command to ltt-sessiond");
+ ret = send_error(KCONSUMERD_COMMAND_SOCK_READY);
+ if (ret < 0) {
+ ERR("Error sending ready command to ltt-sessiond");
+ goto error;
+ }
+
+ while (1) {
+ /* Blocking call, waiting for transmission */
+ sock = lttcomm_accept_unix_sock(client_socket);
+ if (sock <= 0) {
+ continue;
+ }
+
+ /* We first get the number of fd we are about to receive */
+ ret = lttcomm_recv_unix_sock(sock, &tmp,
+ sizeof(struct lttcomm_kconsumerd_header));
+ if (ret < 0) {
+ ERR("Receiving the lttcomm_kconsumerd_header");
+ continue;
+ }
+ ret = consumerd_recv_fd(sock, tmp.payload_size, tmp.cmd_type);
+ if (ret < 0) {
+ continue;
+ }
+ }
+
+error:
+ return NULL;
+}
+
+/*
+ * update_poll_array
+ *
+ * Allocate the pollfd structure and the local view of the out fds
+ * to avoid doing a lookup in the linked list and concurrency issues
+ * when writing is needed.
+ * Returns the number of fds in the structures
+ */
+static int update_poll_array(struct pollfd **pollfd,
+ struct ltt_kconsumerd_fd **local_kconsumerd_fd)
+{
+ struct ltt_kconsumerd_fd *iter;
+ int i = 0;
+
+ if (*pollfd != NULL) {
+ free(*pollfd);
+ *pollfd = NULL;
+ }
+
+ if (*local_kconsumerd_fd != NULL) {
+ free(*local_kconsumerd_fd);
+ *local_kconsumerd_fd = NULL;
+ }
+
+ *pollfd = malloc(fds_count * sizeof(struct pollfd));
+ if (*pollfd == NULL) {
+ perror("pollfd malloc");
+ goto error_mem;
+ }
+
+ *local_kconsumerd_fd = malloc(fds_count * sizeof(struct ltt_kconsumerd_fd));
+ if (*local_kconsumerd_fd == NULL) {
+ perror("local_kconsumerd_fd malloc");
+ goto error_mem;
+ }
+
+ DBG("Updating poll fd array");
+ pthread_mutex_lock(&kconsumerd_lock_fds);
+
+ cds_list_for_each_entry(iter, &kconsumerd_fd_list.head, list) {
+ DBG("Inside for each");
+ if (iter->state == ACTIVE_FD) {
+ DBG("Active FD %d", iter->consumerd_fd);
+ pollfd[i]->fd = iter->consumerd_fd;
+ pollfd[i]->events = POLLIN | POLLPRI;
+ local_kconsumerd_fd[i] = iter;
+ i++;
+ } else if (iter->state == DELETE_FD) {
+ del_fd(iter);
+ }
+ }
+ update_fd_array = 0;
+ pthread_mutex_unlock(&kconsumerd_lock_fds);
+ return i;
+
+error_mem:
+ return -ENOMEM;
+}
+
+/*
+ * thread_poll_fds
+ *
+ * This thread polls the fds in the ltt_fd_list to consume the data
+ * and write it to tracefile if necessary.
+ */
+static void *thread_poll_fds(void *data)
+{
+ int num_rdy, num_hup, high_prio, ret, i;
+ struct pollfd *pollfd = NULL;
+ /* local view of the fds */
+ struct ltt_kconsumerd_fd *local_kconsumerd_fd = NULL;
+ /* local view of fds_count */
+ int nb_fd = 0;
+
+ ret = pipe(thread_pipe);
+ if (ret < 0) {
+ perror("Error creating pipe");
+ goto end;
+ }
+
+ while (1) {
+ high_prio = 0;
+ num_hup = 0;
+
+ /*
+ * the ltt_fd_list has been updated, we need to update our
+ * local array as well
+ */
+ if (update_fd_array) {
+ ret = update_poll_array(&pollfd, &local_kconsumerd_fd);
+ if (ret < 0) {
+ ERR("Error in allocating pollfd or local_outfds");
+ send_error(KCONSUMERD_POLL_ERROR);
+ goto end;
+ }
+ nb_fd = ret;
+ }
+
+ /* poll on the array of fds */
+ DBG("polling on %d fd", nb_fd);
+ num_rdy = poll(pollfd, nb_fd, POLL_TIMEOUT);
+ DBG("poll num_rdy : %d", num_rdy);
+ if (num_rdy == -1) {
+ perror("Poll error");
+ send_error(KCONSUMERD_POLL_ERROR);
+ goto end;
+ }
+
+ /* Take care of high priority channels first. */
+ for (i = 0; i < nb_fd; i++) {
+ switch(pollfd[i].revents) {
+ case POLLERR:
+ ERR("Error returned in polling fd %d.", pollfd[i].fd);
+ num_hup++;
+ send_error(KCONSUMERD_POLL_ERROR);
+ break;
+ case POLLHUP:
+ ERR("Polling fd %d tells it has hung up.", pollfd[i].fd);
+ num_hup++;
+ break;
+ case POLLNVAL:
+ ERR("Polling fd %d tells fd is not open.", pollfd[i].fd);
+ send_error(KCONSUMERD_POLL_NVAL);
+ num_hup++;
+ break;
+ case POLLPRI:
+ DBG("Urgent read on fd %d", pollfd[i].fd);
+ high_prio = 1;
+ ret = read_subbuffer(&local_kconsumerd_fd[i]);
+ /* it's ok to have an unavailable sub-buffer (FIXME : is it ?) */
+ if (ret == EAGAIN) {
+ ret = 0;
+ }
+ break;
+ }
+ }
+
+ /* If every buffer FD has hung up, we end the read loop here */
+ if (nb_fd > 0 && num_hup == nb_fd) {
+ DBG("every buffer FD has hung up\n");
+ send_error(KCONSUMERD_POLL_HUP);
+ continue;
+ }
+
+ /* Take care of low priority channels. */
+ if (!high_prio) {
+ for (i = 0; i < nb_fd; i++) {
+ switch(pollfd[i].revents) {
+ case POLLIN:
+ DBG("Normal read on fd %d", pollfd[i].fd);
+ ret = read_subbuffer(&local_kconsumerd_fd[i]);
+ /* it's ok to have an unavailable subbuffer (FIXME : is it ?) */
+ if (ret == EAGAIN) {
+ ret = 0;
+ }
+ break;
+ }
+ }
+ }
+ }
+end:
+ if (pollfd != NULL) {
+ free(pollfd);
+ pollfd = NULL;
+ }
+ if (local_kconsumerd_fd != NULL) {
+ free(local_kconsumerd_fd);
+ local_kconsumerd_fd = NULL;
+ }
+ return NULL;
+}
+
+/*
+ * usage function on stderr
+ */
+static void usage(void)
+{
+ fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
+ fprintf(stderr, " -h, --help "
+ "Display this usage.\n");
+ fprintf(stderr, " -c, --kconsumerd-cmd-sock PATH "
+ "Specify path for the command socket\n");
+ fprintf(stderr, " -e, --kconsumerd-err-sock PATH "
+ "Specify path for the error socket\n");
+ fprintf(stderr, " -d, --daemonize "
+ "Start as a daemon.\n");
+ fprintf(stderr, " -q, --quiet "
+ "No output at all.\n");
+ fprintf(stderr, " -v, --verbose "
+ "Verbose mode. Activate DBG() macro.\n");
+ fprintf(stderr, " -V, --version "
+ "Show version number.\n");
+}
+
+/*
+ * daemon argument parsing
+ */
+static void parse_args(int argc, char **argv)
+{
+ int c;
+
+ static struct option long_options[] = {
+ { "kconsumerd-cmd-sock", 1, 0, 'c' },
+ { "kconsumerd-err-sock", 1, 0, 'e' },
+ { "daemonize", 0, 0, 'd' },
+ { "help", 0, 0, 'h' },
+ { "quiet", 0, 0, 'q' },
+ { "verbose", 0, 0, 'v' },
+ { "version", 0, 0, 'V' },
+ { NULL, 0, 0, 0 }
+ };
+
+ while (1) {
+ int option_index = 0;
+ c = getopt_long(argc, argv, "dhqvV" "c:e:", long_options, &option_index);
+ if (c == -1) {
+ break;
+ }
+
+ switch (c) {
+ case 0:
+ fprintf(stderr, "option %s", long_options[option_index].name);
+ if (optarg) {
+ fprintf(stderr, " with arg %s\n", optarg);
+ }
+ break;
+ case 'c':
+ snprintf(command_sock_path, PATH_MAX, "%s", optarg);
+ break;
+ case 'e':
+ snprintf(error_sock_path, PATH_MAX, "%s", optarg);
+ break;
+ case 'd':
+ opt_daemon = 1;
+ break;
+ case 'h':
+ usage();
+ exit(EXIT_FAILURE);
+ case 'q':
+ opt_quiet = 1;
+ break;
+ case 'v':
+ opt_verbose = 1;
+ break;
+ case 'V':
+ fprintf(stdout, "%s\n", VERSION);
+ exit(EXIT_SUCCESS);
+ default:
+ usage();
+ exit(EXIT_FAILURE);
+ }
+ }
+}
+
+
+/*
+ * main
+ */
+int main(int argc, char **argv)
+{
+ int i;
+ int ret = 0;
+ void *status;
+
+ /* Parse arguments */
+ progname = argv[0];
+ parse_args(argc, argv);
+
+ /* Daemonize */
+ if (opt_daemon) {
+ ret = daemon(0, 0);
+ if (ret < 0) {
+ perror("daemon");
+ goto error;
+ }
+ }
+
+ if (strlen(command_sock_path) == 0) {
+ snprintf(command_sock_path, PATH_MAX,
+ KCONSUMERD_CMD_SOCK_PATH);
+ }
+ if (strlen(error_sock_path) == 0) {
+ snprintf(error_sock_path, PATH_MAX,
+ KCONSUMERD_ERR_SOCK_PATH);
+ }
+
+ if (set_signal_handler() < 0) {
+ goto error;
+ }
+
+ /* Connect to the socket created by ltt-sessiond to report errors */
+ DBG("Connecting to error socket %s", error_sock_path);
+ error_socket = lttcomm_connect_unix_sock(error_sock_path);
+ /* not a fatal error, but all communication with ltt-sessiond will fail */
+ if (error_socket < 0) {
+ WARN("Cannot connect to error socket, is ltt-sessiond started ?");
+ }
+
+ /* Create the thread to manage the receive of fd */
+ ret = pthread_create(&threads[0], NULL, thread_receive_fds, (void *) NULL);
+ if (ret != 0) {
+ perror("pthread_create");
+ goto error;
+ }
+
+ /* Create thread to manage the polling/writing of traces */
+ ret = pthread_create(&threads[1], NULL, thread_poll_fds, (void *) NULL);
+ if (ret != 0) {
+ perror("pthread_create");
+ goto error;
+ }
+
+ for (i = 0; i < 2; i++) {
+ ret = pthread_join(threads[i], &status);
+ if (ret != 0) {
+ perror("pthread_join");
+ goto error;
+ }
+ }
+ ret = EXIT_SUCCESS;
+ send_error(KCONSUMERD_EXIT_SUCCESS);
+ goto end;
+
+error:
+ ret = EXIT_FAILURE;
+ send_error(KCONSUMERD_EXIT_FAILURE);
+
+end:
+ cleanup();
+
+ return ret;
+}
projects / lttng-tools.git / commitdiff
