static pid_t ppid; /* Parent PID for --sig-parent option */
static pid_t child_ppid; /* Internal parent PID use with daemonize. */
static char *rundir;
+static int lockfile_fd = -1;
/* Set to 1 when a SIGUSR1 signal is received. */
static int recv_child_signal;
{ "jul-tcp-port", 1, 0, 'J' },
{ "config", 1, 0, 'f' },
{ "load", 1, 0, 'l' },
+ { "kmod-probes", 1, 0, 'P' },
{ NULL, 0, 0, 0 }
};
}
}
+/*
+ * Generate the full lock file path using the rundir.
+ *
+ * Return the snprintf() return value thus a negative value is an error.
+ */
+static int generate_lock_file_path(char *path, size_t len)
+{
+ int ret;
+
+ assert(path);
+ assert(rundir);
+
+ /* Build lockfile path from rundir. */
+ ret = snprintf(path, len, "%s/" DEFAULT_LTTNG_SESSIOND_LOCKFILE, rundir);
+ if (ret < 0) {
+ PERROR("snprintf lockfile path");
+ }
+
+ return ret;
+}
+
/*
* Cleanup the daemon
*/
DBG("Removing directory %s", path);
(void) rmdir(path);
- /*
- * We do NOT rmdir rundir because there are other processes
- * using it, for instance lttng-relayd, which can start in
- * parallel with this teardown.
- */
-
- free(rundir);
-
DBG("Cleaning up all sessions");
/* Destroy session list mutex */
free(load_info);
}
+ /*
+ * Cleanup lock file by deleting it and finaly closing it which will
+ * release the file system lock.
+ */
+ if (lockfile_fd >= 0) {
+ char lockfile_path[PATH_MAX];
+
+ ret = generate_lock_file_path(lockfile_path, sizeof(lockfile_path));
+ if (ret > 0) {
+ ret = remove(lockfile_path);
+ if (ret < 0) {
+ PERROR("remove lock file");
+ }
+ ret = close(lockfile_fd);
+ if (ret < 0) {
+ PERROR("close lock file");
+ }
+ }
+ }
+
+ /*
+ * We do NOT rmdir rundir because there are other processes
+ * using it, for instance lttng-relayd, which can start in
+ * parallel with this teardown.
+ */
+
+ free(rundir);
+
/* <fun> */
DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
"Matthew, BEET driven development works!%c[%dm",
break;
}
+ /*
+ * Commands that need a valid session but should NOT create one if none
+ * exists. Instead of creating one and destroying it when the command is
+ * handled, process that right before so we save some round trip in useless
+ * code path.
+ */
+ switch (cmd_ctx->lsm->cmd_type) {
+ case LTTNG_DISABLE_CHANNEL:
+ case LTTNG_DISABLE_EVENT:
+ case LTTNG_DISABLE_ALL_EVENT:
+ switch (cmd_ctx->lsm->domain.type) {
+ case LTTNG_DOMAIN_KERNEL:
+ if (!cmd_ctx->session->kernel_session) {
+ ret = LTTNG_ERR_NO_CHANNEL;
+ goto error;
+ }
+ break;
+ case LTTNG_DOMAIN_JUL:
+ case LTTNG_DOMAIN_UST:
+ if (!cmd_ctx->session->ust_session) {
+ ret = LTTNG_ERR_NO_CHANNEL;
+ goto error;
+ }
+ break;
+ default:
+ ret = LTTNG_ERR_UNKNOWN_DOMAIN;
+ goto error;
+ }
+ default:
+ break;
+ }
+
if (!need_domain) {
goto skip_domain;
}
}
/* 32-bit */
+ pthread_mutex_lock(&ustconsumer32_data.pid_mutex);
if (consumerd32_bin[0] != '\0' &&
ustconsumer32_data.pid == 0 &&
cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
fprintf(stderr, " --jul-tcp-port JUL application registration TCP port\n");
fprintf(stderr, " -f --config Load daemon configuration file\n");
fprintf(stderr, " -l --load PATH Load session configuration\n");
+ fprintf(stderr, " --kmod-probes Specify kernel module probes to load\n");
}
/*
opt_background = 1;
break;
case 'g':
+ /*
+ * If the override option is set, the pointer points to a
+ * *non* const thus freeing it even though the variable type is
+ * set to const.
+ */
+ if (tracing_group_name_override) {
+ free((void *) tracing_group_name);
+ }
tracing_group_name = strdup(arg);
+ if (!tracing_group_name) {
+ perror("strdup");
+ ret = -ENOMEM;
+ }
+ tracing_group_name_override = 1;
break;
case 'h':
usage();
case 'v':
/* Verbose level can increase using multiple -v */
if (arg) {
+ /* Value obtained from config file */
lttng_opt_verbose = config_parse_value(arg);
} else {
- lttng_opt_verbose += 1;
+ /* -v used on command line */
+ lttng_opt_verbose++;
}
+ /* Clamp value to [0, 3] */
+ lttng_opt_verbose = lttng_opt_verbose < 0 ? 0 :
+ (lttng_opt_verbose <= 3 ? lttng_opt_verbose : 3);
break;
case 'Z':
if (arg) {
}
break;
case 'u':
+ if (consumerd32_bin_override) {
+ free((void *) consumerd32_bin);
+ }
consumerd32_bin = strdup(arg);
+ if (!consumerd32_bin) {
+ perror("strdup");
+ ret = -ENOMEM;
+ }
consumerd32_bin_override = 1;
break;
case 'U':
+ if (consumerd32_libdir_override) {
+ free((void *) consumerd32_libdir);
+ }
consumerd32_libdir = strdup(arg);
+ if (!consumerd32_libdir) {
+ perror("strdup");
+ ret = -ENOMEM;
+ }
consumerd32_libdir_override = 1;
break;
case 't':
+ if (consumerd64_bin_override) {
+ free((void *) consumerd64_bin);
+ }
consumerd64_bin = strdup(arg);
+ if (!consumerd64_bin) {
+ perror("strdup");
+ ret = -ENOMEM;
+ }
consumerd64_bin_override = 1;
break;
case 'T':
+ if (consumerd64_libdir_override) {
+ free((void *) consumerd64_libdir);
+ }
consumerd64_libdir = strdup(arg);
+ if (!consumerd64_libdir) {
+ perror("strdup");
+ ret = -ENOMEM;
+ }
consumerd64_libdir_override = 1;
break;
case 'p':
+ free(opt_pidfile);
opt_pidfile = strdup(arg);
+ if (!opt_pidfile) {
+ perror("strdup");
+ ret = -ENOMEM;
+ }
break;
case 'J': /* JUL TCP port. */
{
break;
}
case 'l':
+ free(opt_load_session_path);
opt_load_session_path = strdup(arg);
if (!opt_load_session_path) {
perror("strdup");
ret = -ENOMEM;
}
break;
+ case 'P': /* probe modules list */
+ free(kmod_probes_list);
+ kmod_probes_list = strdup(arg);
+ if (!kmod_probes_list) {
+ perror("strdup");
+ ret = -ENOMEM;
+ }
+ break;
case 'f':
/* This is handled in set_options() thus silent break. */
break;
return;
}
+/*
+ * Create lockfile using the rundir and return its fd.
+ */
+static int create_lockfile(void)
+{
+ int ret;
+ char lockfile_path[PATH_MAX];
+
+ ret = generate_lock_file_path(lockfile_path, sizeof(lockfile_path));
+ if (ret < 0) {
+ goto error;
+ }
+
+ ret = utils_create_lock_file(lockfile_path);
+error:
+ return ret;
+}
+
/*
* Write JUL TCP port using the rundir.
*/
}
}
+ lockfile_fd = create_lockfile();
+ if (lockfile_fd < 0) {
+ goto error;
+ }
+
/* Set consumer initial state */
kernel_consumerd_state = CONSUMER_STOPPED;
ust_consumerd_state = CONSUMER_STOPPED;
projects / lttng-tools.git / blobdiff