/*
- * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
+ * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
+ * Copyright (C) 2019 Jérémie Galarneau <jeremie.galarneau@efficios.com>
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License, version 2 only,
- * as published by the Free Software Foundation.
+ * SPDX-License-Identifier: GPL-2.0-only
*
- * 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.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
-#define _GNU_SOURCE
+#define _LGPL_SOURCE
#include <assert.h>
#include <ctype.h>
#include <popt.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
-#include <time.h>
+#include <common/compat/time.h>
#include <unistd.h>
+#include <signal.h>
+#include <sys/wait.h>
+
+#include <common/mi-lttng.h>
#include "../command.h"
#include "../utils.h"
#include <common/uri.h>
#include <common/utils.h>
#include <lttng/snapshot.h>
+#include <lttng/session-descriptor.h>
static char *opt_output_path;
static char *opt_session_name;
static char *opt_url;
static char *opt_ctrl_url;
static char *opt_data_url;
+static char *opt_shm_path;
static int opt_no_consumer;
static int opt_no_output;
static int opt_snapshot;
-static unsigned int opt_live_timer;
-static int opt_disable_consumer;
+static uint32_t opt_live_timer;
+
+#ifdef LTTNG_EMBED_HELP
+static const char help_msg[] =
+#include <lttng-create.1.h>
+;
+#endif
enum {
OPT_HELP = 1,
OPT_LIVE_TIMER,
};
+enum output_type {
+ OUTPUT_NONE,
+ OUTPUT_LOCAL,
+ OUTPUT_NETWORK,
+ OUTPUT_UNSPECIFIED,
+};
+
+static struct mi_writer *writer;
static struct poptOption long_options[] = {
/* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
{"help", 'h', POPT_ARG_NONE, NULL, OPT_HELP, NULL, NULL},
{"data-url", 'D', POPT_ARG_STRING, &opt_data_url, 0, 0, 0},
{"no-output", 0, POPT_ARG_VAL, &opt_no_output, 1, 0, 0},
{"no-consumer", 0, POPT_ARG_VAL, &opt_no_consumer, 1, 0, 0},
- {"disable-consumer", 0, POPT_ARG_VAL, &opt_disable_consumer, 1, 0, 0},
{"snapshot", 0, POPT_ARG_VAL, &opt_snapshot, 1, 0, 0},
{"live", 0, POPT_ARG_INT | POPT_ARGFLAG_OPTIONAL, 0, OPT_LIVE_TIMER, 0, 0},
+ {"shm-path", 0, POPT_ARG_STRING, &opt_shm_path, 0, 0, 0},
{0, 0, 0, 0, 0, 0, 0}
};
/*
- * Please have a look at src/lib/lttng-ctl/lttng-ctl.c for more information on
- * why this declaration exists and used ONLY in for this command.
+ * Retrieve the created session and mi output it based on provided argument
+ * This is currently a summary of what was pretty printed and is subject to
+ * enhancements.
*/
-extern int _lttng_create_session_ext(const char *name, const char *url,
- const char *datetime, int live_timer);
-
-/*
- * usage
- */
-static void usage(FILE *ofp)
+static int mi_created_session(const char *session_name)
{
- fprintf(ofp, "usage: lttng create [NAME] [OPTIONS] \n");
- fprintf(ofp, "\n");
- fprintf(ofp, "Without a given NAME, the default is 'auto-<yyyymmdd>-<hhmmss>'\n");
- fprintf(ofp, "\n");
- fprintf(ofp, "Options:\n");
- fprintf(ofp, " -h, --help Show this help\n");
- fprintf(ofp, " --list-options Simple listing of options\n");
- fprintf(ofp, " -o, --output PATH Specify output path for traces\n");
- fprintf(ofp, " --no-output Traces will not be outputted\n");
- fprintf(ofp, " --snapshot Set the session in snapshot mode.\n");
- fprintf(ofp, " Created in no-output mode and uses the URL,\n");
- fprintf(ofp, " if one, as the default snapshot output.\n");
- fprintf(ofp, " Every channel will be set in overwrite mode\n");
- fprintf(ofp, " and with mmap output (splice not supported).\n");
- fprintf(ofp, " --live [USEC] Set the session in live-reading mode.\n");
- fprintf(ofp, " The delay parameter in micro-seconds is the\n");
- fprintf(ofp, " maximum time the user can wait for the data\n");
- fprintf(ofp, " to be flushed. Can be set with a network\n");
- fprintf(ofp, " URL (-U or -C/-D) and must have a relayd listening.\n");
- fprintf(ofp, " By default, %u is used for the timer and the\n",
- DEFAULT_LTTNG_LIVE_TIMER);
- fprintf(ofp, " network URL is set to net://127.0.0.1.\n");
- fprintf(ofp, "\n");
- fprintf(ofp, "Extended Options:\n");
- fprintf(ofp, "\n");
- fprintf(ofp, "Using these options, each API call can be controlled individually.\n");
- fprintf(ofp, "\n");
- fprintf(ofp, " -U, --set-url=URL Set URL destination of the trace data.\n");
- fprintf(ofp, " It is persistent for the session lifetime.\n");
- fprintf(ofp, " This will set both data and control URL.\n");
- fprintf(ofp, " You can change it with the enable-consumer cmd\n");
- fprintf(ofp, " -C, --ctrl-url=URL Set control path URL. (Must use -D also)\n");
- fprintf(ofp, " -D, --data-url=URL Set data path URL. (Must use -C also)\n");
- fprintf(ofp, "\n");
- fprintf(ofp, "Please refer to the man page (lttng(1)) for more information on network\n");
- fprintf(ofp, "streaming mechanisms and explanation of the control and data port\n");
- fprintf(ofp, "You must have a running remote lttng-relayd for network streaming\n");
- fprintf(ofp, "\n");
- fprintf(ofp, "URL format is has followed:\n");
- fprintf(ofp, "\n");
- fprintf(ofp, " proto://[HOST|IP][:PORT1[:PORT2]][/TRACE_PATH]\n");
- fprintf(ofp, "\n");
- fprintf(ofp, " Supported protocols are (proto):\n");
- fprintf(ofp, " > file://...\n");
- fprintf(ofp, " Local filesystem full path.\n");
- fprintf(ofp, "\n");
- fprintf(ofp, " > net[6]://...\n");
- fprintf(ofp, " This will use the default network transport layer which is\n");
- fprintf(ofp, " TCP for both control (PORT1) and data port (PORT2).\n");
- fprintf(ofp, " The default ports are respectively 5342 and 5343.\n");
- fprintf(ofp, "\n");
- fprintf(ofp, " > tcp[6]://...\n");
- fprintf(ofp, " Can only be used with -C and -D together\n");
- fprintf(ofp, "\n");
- fprintf(ofp, "NOTE: IPv6 address MUST be enclosed in brackets '[]' (rfc2732)\n");
- fprintf(ofp, "\n");
- fprintf(ofp, "Examples:\n");
- fprintf(ofp, " # lttng create -U net://192.168.1.42\n");
- fprintf(ofp, " Uses TCP and default ports for the given destination.\n");
- fprintf(ofp, " # lttng create -U net6://[fe80::f66d:4ff:fe53:d220]\n");
- fprintf(ofp, " Uses TCP, default ports and IPv6.\n");
- fprintf(ofp, " # lttng create s1 -U net://myhost.com:3229\n");
- fprintf(ofp, " Set the consumer to the remote HOST on port 3229 for control.\n");
- fprintf(ofp, "\n");
-}
-
-/*
- * For a session name, set the consumer URLs.
- */
-static int set_consumer_url(const char *session_name, const char *ctrl_url,
- const char *data_url)
-{
- int ret;
- struct lttng_handle *handle;
- struct lttng_domain dom;
+ int ret, i, count, found;
+ struct lttng_session *sessions;
+ /* session_name should not be null */
assert(session_name);
+ assert(writer);
- /*
- * Set handle with the session name and the domain set to 0. This means to
- * the session daemon that the next action applies on the tracing session
- * rather then the domain specific session.
- */
- memset(&dom, 0, sizeof(dom));
-
- handle = lttng_create_handle(session_name, &dom);
- if (handle == NULL) {
- ret = CMD_FATAL;
+ count = lttng_list_sessions(&sessions);
+ if (count < 0) {
+ ret = count;
+ ERR("%s", lttng_strerror(ret));
goto error;
}
- ret = lttng_set_consumer_url(handle, ctrl_url, data_url);
- if (ret < 0) {
- goto error;
+ if (count == 0) {
+ ERR("Error session creation failed: session %s not found", session_name);
+ ret = -LTTNG_ERR_SESS_NOT_FOUND;
+ goto end;
}
- if (ctrl_url) {
- MSG("Control URL %s set for session %s", ctrl_url, session_name);
+ found = 0;
+ for (i = 0; i < count; i++) {
+ if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) {
+ found = 1;
+ ret = mi_lttng_session(writer, &sessions[i], 0);
+ if (ret) {
+ goto error;
+ }
+ break;
+ }
}
- if (data_url) {
- MSG("Data URL %s set for session %s", data_url, session_name);
+ if (!found) {
+ ret = -LTTNG_ERR_SESS_NOT_FOUND;
+ } else {
+ ret = CMD_SUCCESS;
}
error:
- lttng_destroy_handle(handle);
+ free(sessions);
+end:
return ret;
}
-static int add_snapshot_output(const char *session_name, const char *ctrl_url,
- const char *data_url)
+static
+struct lttng_session_descriptor *create_session_descriptor(void)
{
int ret;
- struct lttng_snapshot_output *output = NULL;
-
- assert(session_name);
+ ssize_t uri_count;
+ enum output_type output_type;
+ struct lttng_uri *uris = NULL;
+ struct lttng_session_descriptor *descriptor = NULL;
+ const char *uri_str1 = NULL, *uri_str2 = NULL;
+ char local_output_path[LTTNG_PATH_MAX] = {};
+
+ if (opt_no_output) {
+ output_type = OUTPUT_NONE;
+ } else if (opt_output_path) {
+ char *expanded_output_path;
+
+ output_type = OUTPUT_LOCAL;
+ expanded_output_path = utils_expand_path(opt_output_path);
+ if (!expanded_output_path) {
+ ERR("Failed to expand output path.");
+ goto end;
+ }
+ ret = lttng_strncpy(local_output_path, expanded_output_path,
+ sizeof(local_output_path));
+ free(expanded_output_path);
+ if (ret) {
+ ERR("Output path exceeds the maximal supported length (%zu bytes)",
+ sizeof(local_output_path));
+ goto end;
+ }
+ } else if (opt_url || opt_ctrl_url) {
+ uri_str1 = opt_ctrl_url ? opt_ctrl_url : opt_url;
+ uri_str2 = opt_data_url;
- output = lttng_snapshot_output_create();
- if (!output) {
- ret = CMD_FATAL;
- goto error_create;
- }
+ uri_count = uri_parse_str_urls(uri_str1, uri_str2, &uris);
+ if (uri_count != 1 && uri_count != 2) {
+ ERR("Unrecognized URL format.");
+ goto end;
+ }
- if (ctrl_url) {
- ret = lttng_snapshot_output_set_ctrl_url(ctrl_url, output);
- if (ret < 0) {
- goto error;
+ switch (uri_count) {
+ case 1:
+ output_type = OUTPUT_LOCAL;
+ if (uris[0].dtype != LTTNG_DST_PATH) {
+ ERR("Unrecognized URL format.");
+ goto end;
+ }
+ ret = lttng_strncpy(local_output_path, uris[0].dst.path,
+ sizeof(local_output_path));
+ if (ret) {
+ ERR("Output path exceeds the maximal supported length (%zu bytes)",
+ sizeof(local_output_path));
+ }
+ break;
+ case 2:
+ output_type = OUTPUT_NETWORK;
+ break;
+ default:
+ /* Already checked. */
+ abort();
}
+ } else {
+ output_type = OUTPUT_UNSPECIFIED;
}
- if (data_url) {
- ret = lttng_snapshot_output_set_data_url(data_url, output);
- if (ret < 0) {
- goto error;
+ if (opt_snapshot) {
+ /* Snapshot session. */
+ switch (output_type) {
+ case OUTPUT_UNSPECIFIED:
+ case OUTPUT_LOCAL:
+ descriptor = lttng_session_descriptor_snapshot_local_create(
+ opt_session_name,
+ output_type == OUTPUT_LOCAL ?
+ local_output_path : NULL);
+ break;
+ case OUTPUT_NONE:
+ descriptor = lttng_session_descriptor_snapshot_create(
+ opt_session_name);
+ break;
+ case OUTPUT_NETWORK:
+ descriptor = lttng_session_descriptor_snapshot_network_create(
+ opt_session_name, uri_str1, uri_str2);
+ break;
+ default:
+ abort();
+ }
+ } else if (opt_live_timer) {
+ /* Live session. */
+ if (output_type != OUTPUT_UNSPECIFIED &&
+ output_type != OUTPUT_NETWORK) {
+ ERR("Unsupported output type specified for live session.");
+ goto end;
+ }
+ descriptor = lttng_session_descriptor_live_network_create(
+ opt_session_name, uri_str1, uri_str2,
+ opt_live_timer);
+ } else {
+ /* Regular session. */
+ switch (output_type) {
+ case OUTPUT_UNSPECIFIED:
+ case OUTPUT_LOCAL:
+ descriptor = lttng_session_descriptor_local_create(
+ opt_session_name,
+ output_type == OUTPUT_LOCAL ?
+ local_output_path : NULL);
+ break;
+ case OUTPUT_NONE:
+ descriptor = lttng_session_descriptor_create(
+ opt_session_name);
+ break;
+ case OUTPUT_NETWORK:
+ descriptor = lttng_session_descriptor_network_create(
+ opt_session_name, uri_str1, uri_str2);
+ break;
+ default:
+ abort();
}
}
-
- /* This call, if successful, populates the id of the output object. */
- ret = lttng_snapshot_add_output(session_name, output);
- if (ret < 0) {
- goto error;
+ if (!descriptor) {
+ ERR("Failed to initialize session creation command.");
+ } else {
+ /*
+ * Auto-launch the relay daemon when a live session
+ * is created using default URLs.
+ */
+ if (!opt_url && !opt_ctrl_url && !opt_data_url &&
+ opt_live_timer && !check_relayd()) {
+ int ret;
+ const char *pathname = opt_relayd_path ? :
+ INSTALL_BIN_PATH "/lttng-relayd";
+
+ ret = spawn_relayd(pathname, 0);
+ if (ret < 0) {
+ lttng_session_descriptor_destroy(descriptor);
+ descriptor = NULL;
+ }
+ }
}
-
-error:
- lttng_snapshot_output_destroy(output);
-error_create:
- return ret;
+end:
+ free(uris);
+ return descriptor;
}
/*
*/
static int create_session(void)
{
- int ret;
- char *session_name = NULL, *traces_path = NULL, *alloc_path = NULL;
- char *alloc_url = NULL, *url = NULL, datetime[16];
- char session_name_date[NAME_MAX + 17], *print_str_url = NULL;
- time_t rawtime;
- struct tm *timeinfo;
-
- /* Get date and time for automatic session name/path */
- time(&rawtime);
- timeinfo = localtime(&rawtime);
- strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
-
- /* Auto session name creation */
- if (opt_session_name == NULL) {
- ret = snprintf(session_name_date, sizeof(session_name_date),
- DEFAULT_SESSION_NAME "-%s", datetime);
- if (ret < 0) {
- PERROR("snprintf session name");
- goto error;
- }
- session_name = session_name_date;
- DBG("Auto session name set to %s", session_name_date);
- } else {
+ int ret, i;
+ char shm_path[LTTNG_PATH_MAX] = {};
+ struct lttng_session_descriptor *session_descriptor = NULL;
+ enum lttng_session_descriptor_status descriptor_status;
+ enum lttng_error_code ret_code;
+ struct lttng_session *sessions = NULL;
+ const struct lttng_session *created_session = NULL;
+ const char *created_session_name;
+
+ /* Validate options. */
+ if (opt_session_name) {
if (strlen(opt_session_name) > NAME_MAX) {
ERR("Session name too long. Length must be lower or equal to %d",
NAME_MAX);
- ret = LTTNG_ERR_SESSION_FAIL;
+ ret = CMD_ERROR;
goto error;
}
/*
ret = CMD_ERROR;
goto error;
}
- session_name = opt_session_name;
- ret = snprintf(session_name_date, sizeof(session_name_date),
- "%s-%s", session_name, datetime);
- if (ret < 0) {
- PERROR("snprintf session name");
- goto error;
- }
+ }
+
+ if (opt_snapshot && opt_live_timer) {
+ ERR("Snapshot and live modes are mutually exclusive.");
+ ret = CMD_ERROR;
+ goto error;
}
if ((!opt_ctrl_url && opt_data_url) || (opt_ctrl_url && !opt_data_url)) {
- ERR("You need both control and data URL.");
+ ERR("Both control and data URLs must be specified.");
ret = CMD_ERROR;
goto error;
}
- if (opt_output_path != NULL) {
- traces_path = utils_expand_path(opt_output_path);
- if (traces_path == NULL) {
- ret = CMD_ERROR;
- goto error;
- }
+ session_descriptor = create_session_descriptor();
+ if (!session_descriptor) {
+ ret = CMD_ERROR;
+ goto error;
+ }
+ ret_code = lttng_create_session_ext(session_descriptor);
+ if (ret_code != LTTNG_OK) {
+ ERR("%s", lttng_strerror(-ret_code));
+ ret = CMD_ERROR;
+ goto error;
+ }
- /* Create URL string from the local filesytem path */
- ret = asprintf(&alloc_url, "file://%s", traces_path);
- if (ret < 0) {
- PERROR("asprintf url path");
- ret = CMD_FATAL;
- goto error;
+ descriptor_status = lttng_session_descriptor_get_session_name(
+ session_descriptor, &created_session_name);
+ if (descriptor_status != LTTNG_SESSION_DESCRIPTOR_STATUS_OK) {
+ ERR("Failed to obtain created session name");
+ ret = CMD_ERROR;
+ goto error;
+ }
+
+ ret = lttng_list_sessions(&sessions);
+ if (ret < 0) {
+ ERR("Failed to fetch properties of created session: %s",
+ lttng_strerror(ret));
+ ret = CMD_ERROR;
+ goto error;
+ }
+ for (i = 0; i < ret; i++) {
+ if (!strcmp(created_session_name, sessions[i].name)) {
+ created_session = &sessions[i];
+ break;
}
- /* URL to use in the lttng_create_session() call */
- url = alloc_url;
- print_str_url = traces_path;
- } else if (opt_url) { /* Handling URL (-U opt) */
- url = opt_url;
- print_str_url = url;
- } else if (opt_data_url && opt_ctrl_url) {
+ }
+ if (!created_session) {
+ ERR("Failed to fetch properties of created session");
+ ret = CMD_ERROR;
+ goto error;
+ }
+
+ if (opt_shm_path) {
+ char datetime_suffix[17] = {};
+
/*
- * With both control and data, we'll be setting the consumer URL after
- * session creation thus use no URL.
+ * An auto-generated session name already includes the creation
+ * timestamp.
*/
- url = NULL;
- } else if (!opt_no_output) {
- /* Auto output path */
- alloc_path = utils_get_home_dir();
- if (alloc_path == NULL) {
- ERR("HOME path not found.\n \
- Please specify an output path using -o, --output PATH");
- ret = CMD_FATAL;
- goto error;
+ if (opt_session_name) {
+ uint64_t creation_time;
+ struct tm *timeinfo;
+ time_t creation_time_t;
+ size_t strftime_ret;
+
+ ret_code = lttng_session_get_creation_time(
+ created_session,
+ &creation_time);
+ if (ret_code != LTTNG_OK) {
+ ERR("%s", lttng_strerror(-ret_code));
+ ret = CMD_ERROR;
+ goto error;
+ }
+ creation_time_t = (time_t) creation_time;
+ timeinfo = localtime(&creation_time_t);
+ if (!timeinfo) {
+ PERROR("Failed to interpret session creation time");
+ ret = CMD_ERROR;
+ goto error;
+ }
+ strftime_ret = strftime(datetime_suffix,
+ sizeof(datetime_suffix),
+ "-%Y%m%d-%H%M%S", timeinfo);
+ if (strftime_ret == 0) {
+ ERR("Failed to format session creation time.");
+ ret = CMD_ERROR;
+ goto error;
+ }
}
- alloc_path = strdup(alloc_path);
- ret = asprintf(&alloc_url,
- "file://%s/" DEFAULT_TRACE_DIR_NAME "/%s",
- alloc_path, session_name_date);
+ ret = snprintf(shm_path, sizeof(shm_path),
+ "%s/%s%s", opt_shm_path, created_session_name,
+ datetime_suffix);
+ if (ret < 0 || ret >= sizeof(shm_path)) {
+ ERR("Failed to format the shared memory path.");
+ ret = CMD_ERROR;
+ goto error;
+ }
+ ret = lttng_set_session_shm_path(created_session_name,
+ shm_path);
if (ret < 0) {
- PERROR("asprintf trace dir name");
- ret = CMD_FATAL;
+ lttng_destroy_session(created_session_name);
+ ret = CMD_ERROR;
goto error;
}
+ }
- url = alloc_url;
- print_str_url = alloc_url + strlen("file://");
+ if (opt_snapshot) {
+ MSG("Snapshot session %s created.", created_session_name);
+ } else if (opt_live_timer) {
+ MSG("Live session %s created.", created_session_name);
} else {
- /* No output means --no-output or --snapshot mode. */
- url = NULL;
+ MSG("Session %s created.", created_session_name);
}
- /* Use default live URL if NO url is/are found. */
- if ((opt_live_timer && !opt_url) && (opt_live_timer && !opt_data_url)) {
- ret = asprintf(&alloc_url, "net://127.0.0.1");
+ if (*created_session->path && !opt_snapshot) {
+ MSG("Traces will be output to %s", created_session->path);
+
+ if (opt_live_timer) {
+ MSG("Live timer interval set to %u %s", opt_live_timer,
+ USEC_UNIT);
+ }
+ } else if (opt_snapshot) {
+ struct lttng_snapshot_output_list *list;
+ struct lttng_snapshot_output *iter;
+ char snapshot_url[LTTNG_PATH_MAX] = {};
+
+ ret = lttng_snapshot_list_output(created_session_name, &list);
if (ret < 0) {
- PERROR("asprintf default live URL");
- ret = CMD_FATAL;
+ ERR("Failed to list snapshot outputs.");
+ ret = CMD_ERROR;
goto error;
}
- url = alloc_url;
- print_str_url = url;
- }
-
- if (opt_snapshot && opt_live_timer) {
- ERR("Snapshot and live modes are mutually exclusive.");
- ret = CMD_ERROR;
- goto error;
- }
- if (opt_snapshot) {
- /* No output by default. */
- const char *snapshot_url = NULL;
+ while ((iter = lttng_snapshot_output_list_get_next(list))) {
+ const char *url = NULL;
- if (opt_url) {
- snapshot_url = url;
- } else if (!opt_data_url && !opt_ctrl_url) {
- /* This is the session path that we need to use as output. */
- snapshot_url = url;
+ url = lttng_snapshot_output_get_ctrl_url(
+ iter);
+ ret = lttng_strncpy(snapshot_url, url,
+ sizeof(snapshot_url));
+ if (ret) {
+ snapshot_url[0] = '\0';
+ ERR("Failed to retrieve snapshot output destination");
+ }
+ break;
}
- ret = lttng_create_session_snapshot(session_name, snapshot_url);
- } else if (opt_live_timer) {
- const char *pathname;
+ lttng_snapshot_output_list_destroy(list);
- if (opt_relayd_path) {
- pathname = opt_relayd_path;
- } else {
- pathname = INSTALL_BIN_PATH "/lttng-relayd";
+ if (*snapshot_url) {
+ MSG("Default snapshot output set to %s",
+ snapshot_url);
}
- if (!opt_url && !opt_data_url && !check_relayd() &&
- spawn_relayd(pathname, 0) < 0) {
+ MSG("Every channel enabled for this session will be set to mmap output and default to overwrite mode.");
+ }
+ if (opt_shm_path) {
+ MSG("Shared memory path set to %s", shm_path);
+ }
+
+ /* Mi output */
+ if (lttng_opt_mi) {
+ ret = mi_created_session(created_session_name);
+ if (ret) {
+ ret = CMD_ERROR;
goto error;
}
- ret = lttng_create_session_live(session_name, url, opt_live_timer);
- } else {
- ret = _lttng_create_session_ext(session_name, url, datetime, -1);
}
+
+ /* Init lttng session config */
+ ret = config_init(created_session_name);
if (ret < 0) {
- /* Don't set ret so lttng can interpret the sessiond error. */
- switch (-ret) {
- case LTTNG_ERR_EXIST_SESS:
- WARN("Session %s already exists", session_name);
- break;
- default:
- break;
- }
+ ret = CMD_ERROR;
goto error;
}
- if (opt_ctrl_url && opt_data_url) {
- if (opt_snapshot) {
- ret = add_snapshot_output(session_name, opt_ctrl_url,
- opt_data_url);
+ ret = CMD_SUCCESS;
+error:
+ lttng_session_descriptor_destroy(session_descriptor);
+ free(sessions);
+ return ret;
+}
+
+/*
+ * spawn_sessiond
+ *
+ * Spawn a session daemon by forking and execv.
+ */
+static int spawn_sessiond(const char *pathname)
+{
+ int ret = 0;
+ pid_t pid;
+
+ MSG("Spawning a session daemon");
+ pid = fork();
+ if (pid == 0) {
+ /*
+ * Spawn session daemon in daemon mode.
+ */
+ execlp(pathname, "lttng-sessiond",
+ "--daemonize", NULL);
+ /* execlp only returns if error happened */
+ if (errno == ENOENT) {
+ ERR("No session daemon found. Use --sessiond-path.");
} else {
- /* Setting up control URI (-C or/and -D opt) */
- ret = set_consumer_url(session_name, opt_ctrl_url, opt_data_url);
+ PERROR("execlp");
}
- if (ret < 0) {
- /* Destroy created session because the URL are not valid. */
- lttng_destroy_session(session_name);
- goto error;
+ kill(getppid(), SIGTERM); /* wake parent */
+ exit(EXIT_FAILURE);
+ } else if (pid > 0) {
+ /*
+ * In daemon mode (--daemonize), sessiond only exits when
+ * it's ready to accept commands.
+ */
+ for (;;) {
+ int status;
+ pid_t wait_pid_ret = waitpid(pid, &status, 0);
+
+ if (wait_pid_ret < 0) {
+ if (errno == EINTR) {
+ continue;
+ }
+ PERROR("waitpid");
+ ret = -errno;
+ goto end;
+ }
+
+ if (WIFSIGNALED(status)) {
+ ERR("Session daemon was killed by signal %d",
+ WTERMSIG(status));
+ ret = -1;
+ goto end;
+ } else if (WIFEXITED(status)) {
+ DBG("Session daemon terminated normally (exit status: %d)",
+ WEXITSTATUS(status));
+
+ if (WEXITSTATUS(status) != 0) {
+ ERR("Session daemon terminated with an error (exit status: %d)",
+ WEXITSTATUS(status));
+ ret = -1;
+ goto end;
+ }
+ break;
+ }
}
+
+ goto end;
+ } else {
+ PERROR("fork");
+ ret = -1;
+ goto end;
}
- MSG("Session %s created.", session_name);
- if (print_str_url && !opt_snapshot) {
- MSG("Traces will be written in %s", print_str_url);
+end:
+ return ret;
+}
- if (opt_live_timer) {
- MSG("Live timer set to %u usec", opt_live_timer);
- }
- } else if (opt_snapshot) {
- if (print_str_url) {
- MSG("Default snapshot output set to: %s", print_str_url);
- }
- MSG("Snapshot mode set. Every channel enabled for that session will "
- "be set in overwrite mode and mmap output.");
+/*
+ * launch_sessiond
+ *
+ * Check if the session daemon is available using
+ * the liblttngctl API for the check. If not, try to
+ * spawn a daemon.
+ */
+static int launch_sessiond(void)
+{
+ int ret;
+ const char *pathname = NULL;
+
+ ret = lttng_session_daemon_alive();
+ if (ret) {
+ /* Sessiond is alive, not an error */
+ ret = 0;
+ goto end;
}
- /* Init lttng session config */
- ret = config_init(session_name);
- if (ret < 0) {
- ret = CMD_ERROR;
- goto error;
+ /* Try command line option path */
+ pathname = opt_sessiond_path;
+
+ /* Try LTTNG_SESSIOND_PATH env variable */
+ if (pathname == NULL) {
+ pathname = getenv(DEFAULT_SESSIOND_PATH_ENV);
}
- ret = CMD_SUCCESS;
+ /* Try with configured path */
+ if (pathname == NULL) {
+ if (CONFIG_SESSIOND_BIN[0] != '\0') {
+ pathname = CONFIG_SESSIOND_BIN;
+ }
+ }
-error:
- free(alloc_url);
- free(traces_path);
- free(alloc_path);
+ /* Try the default path */
+ if (pathname == NULL) {
+ pathname = INSTALL_BIN_PATH "/lttng-sessiond";
+ }
+
+ DBG("Session daemon binary path: %s", pathname);
+ /* Check existence and permissions */
+ ret = access(pathname, F_OK | X_OK);
if (ret < 0) {
- ERR("%s", lttng_strerror(ret));
+ ERR("No such file or access denied: %s", pathname);
+ goto end;
}
+
+ ret = spawn_sessiond(pathname);
+end:
+ if (ret) {
+ ERR("Problem occurred while launching session daemon (%s)",
+ pathname);
+ }
+ return ret;
+}
+
+static
+int validate_url_option_combination(void)
+{
+ int ret = 0;
+ int used_count = 0;
+
+ used_count += !!opt_url;
+ used_count += !!opt_output_path;
+ used_count += (opt_data_url || opt_ctrl_url);
+ if (used_count > 1) {
+ ERR("Only one of the --set-url, --ctrl-url/data-url, or --output options may be used at once.");
+ ret = -1;
+ }
+
return ret;
}
*/
int cmd_create(int argc, const char **argv)
{
- int opt, ret = CMD_SUCCESS;
+ int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1;
char *opt_arg = NULL;
+ const char *leftover = NULL;
static poptContext pc;
pc = poptGetContext(NULL, argc, argv, long_options, 0);
while ((opt = poptGetNextOpt(pc)) != -1) {
switch (opt) {
case OPT_HELP:
- usage(stdout);
+ SHOW_HELP();
goto end;
case OPT_LIST_OPTIONS:
list_cmd_options(stdout, long_options);
goto end;
case OPT_LIVE_TIMER:
{
- unsigned long v;
+ uint64_t v;
errno = 0;
opt_arg = poptGetOptArg(pc);
break;
}
- v = strtoul(opt_arg, NULL, 0);
- if (errno != 0 || !isdigit(opt_arg[0])) {
- ERR("Wrong value in --live parameter: %s", opt_arg);
+ if (utils_parse_time_suffix(opt_arg, &v) < 0) {
+ ERR("Wrong value for --live parameter: %s", opt_arg);
ret = CMD_ERROR;
goto end;
}
+
if (v != (uint32_t) v) {
ERR("32-bit overflow in --live parameter: %s", opt_arg);
ret = CMD_ERROR;
goto end;
}
+
+ if (v == 0) {
+ ERR("Live timer interval must be greater than zero");
+ ret = CMD_ERROR;
+ goto end;
+ }
+
opt_live_timer = (uint32_t) v;
DBG("Session live timer interval set to %d", opt_live_timer);
break;
}
default:
- usage(stderr);
ret = CMD_UNDEFINED;
goto end;
}
}
- /* TODO: mi support */
- if (lttng_opt_mi) {
- ret = -LTTNG_ERR_MI_NOT_IMPLEMENTED;
- ERR("mi option not supported");
- goto end;
- }
-
if (opt_no_consumer) {
MSG("The option --no-consumer is obsolete. Use --no-output now.");
ret = CMD_WARNING;
goto end;
}
- if (opt_disable_consumer) {
- MSG("The option --disable-consumer is obsolete.");
- ret = CMD_WARNING;
+ ret = validate_url_option_combination();
+ if (ret) {
+ ret = CMD_ERROR;
goto end;
}
+ /* Spawn a session daemon if needed */
+ if (!opt_no_sessiond) {
+ ret = launch_sessiond();
+ if (ret) {
+ ret = CMD_ERROR;
+ goto end;
+ }
+ }
+
+ /* MI initialization */
+ if (lttng_opt_mi) {
+ writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
+ if (!writer) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto end;
+ }
+
+ /* Open command element */
+ ret = mi_lttng_writer_command_open(writer,
+ mi_lttng_element_command_create);
+ if (ret) {
+ ret = CMD_ERROR;
+ goto end;
+ }
+
+ /* Open output element */
+ ret = mi_lttng_writer_open_element(writer,
+ mi_lttng_element_command_output);
+ if (ret) {
+ ret = CMD_ERROR;
+ goto end;
+ }
+ }
opt_session_name = (char*) poptGetArg(pc);
- ret = create_session();
+ leftover = poptGetArg(pc);
+ if (leftover) {
+ ERR("Unknown argument: %s", leftover);
+ ret = CMD_ERROR;
+ goto end;
+ }
+
+ command_ret = create_session();
+ if (command_ret) {
+ success = 0;
+ }
+
+ if (lttng_opt_mi) {
+ /* Close output element */
+ ret = mi_lttng_writer_close_element(writer);
+ if (ret) {
+ ret = CMD_ERROR;
+ goto end;
+ }
+
+ /* Success ? */
+ ret = mi_lttng_writer_write_element_bool(writer,
+ mi_lttng_element_command_success, success);
+ if (ret) {
+ ret = CMD_ERROR;
+ goto end;
+ }
+
+ /* Command element close */
+ ret = mi_lttng_writer_command_close(writer);
+ if (ret) {
+ ret = CMD_ERROR;
+ goto end;
+ }
+ }
end:
+ /* Mi clean-up */
+ if (writer && mi_lttng_writer_destroy(writer)) {
+ /* Preserve original error code */
+ ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL;
+ }
+
+ /* Overwrite ret if an error occurred in create_session() */
+ ret = command_ret ? command_ret : ret;
+
poptFreeContext(pc);
return ret;
}
projects / lttng-tools.git / blobdiff