X-Git-Url: http://git.efficios.com/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng%2Fcommands%2Fcreate.c;h=379ca0a660908c1e3454fafd3d193b83e029e081;hp=08b12a46eee2b95e6093f738a97a5b0f01936551;hb=refs%2Fheads%2Fsow-2019-0002-rev1;hpb=04965770958ef684f0e40d948264dc3283b4bcdc diff --git a/src/bin/lttng/commands/create.c b/src/bin/lttng/commands/create.c index 08b12a46e..379ca0a66 100644 --- a/src/bin/lttng/commands/create.c +++ b/src/bin/lttng/commands/create.c @@ -1,30 +1,26 @@ /* - * Copyright (C) 2011 - David Goulet + * Copyright (C) 2011 David Goulet + * Copyright (C) 2019 Jérémie Galarneau * - * 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 +#include #include #include #include #include #include #include -#include +#include #include +#include +#include + +#include #include "../command.h" #include "../utils.h" @@ -33,214 +29,248 @@ #include #include #include +#include +#include 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_disable_consumer; +static int opt_no_output; +static int opt_snapshot; +static uint32_t opt_live_timer; + +#ifdef LTTNG_EMBED_HELP +static const char help_msg[] = +#include +; +#endif enum { OPT_HELP = 1, OPT_LIST_OPTIONS, + 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}, {"output", 'o', POPT_ARG_STRING, &opt_output_path, 0, NULL, NULL}, {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL}, - {"set-uri", 'U', POPT_ARG_STRING, &opt_url, 0, 0, 0}, - {"ctrl-uri", 'C', POPT_ARG_STRING, &opt_ctrl_url, 0, 0, 0}, - {"data-uri", 'D', POPT_ARG_STRING, &opt_data_url, 0, 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}, + {"set-url", 'U', POPT_ARG_STRING, &opt_url, 0, 0, 0}, + {"ctrl-url", 'C', POPT_ARG_STRING, &opt_ctrl_url, 0, 0, 0}, + {"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}, + {"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. - */ -extern int _lttng_create_session_ext(const char *name, const char *url, - const char *datetime); - -/* - * usage + * 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. */ -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--'\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, "\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, " --no-consumer Don't activate a consumer for this session.\n"); - fprintf(ofp, " --disable-consumer\n"); - fprintf(ofp, " Disable consumer for this session.\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[4|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; } -/* - * For a session name, enable the consumer. - */ -static int enable_consumer(const char *session_name) +static +struct lttng_session_descriptor *create_session_descriptor(void) { int ret; - struct lttng_handle *handle; - struct lttng_domain dom; - - 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; - /* - * 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. - * - * XXX: This '0' value should be a domain enum value. - */ - memset(&dom, 0, sizeof(dom)); - - handle = lttng_create_handle(session_name, 0); - if (handle == NULL) { - ret = CMD_FATAL; - goto error; - } + uri_count = uri_parse_str_urls(uri_str1, uri_str2, &uris); + if (uri_count != 1 && uri_count != 2) { + ERR("Unrecognized URL format."); + goto end; + } - ret = lttng_enable_consumer(handle); - 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; } - MSG("Consumer enabled for session %s", session_name); - -error: - lttng_destroy_handle(handle); - return ret; -} - -/* - * For a session name, disable the consumer. - */ -static int disable_consumer(const char *session_name) -{ - int ret; - struct lttng_handle *handle; - - assert(session_name); - - /* - * 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. - * - * XXX: This '0' value should be a domain enum value. - */ - handle = lttng_create_handle(session_name, 0); - if (handle == NULL) { - ret = CMD_FATAL; - 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(); + } } - - ret = lttng_disable_consumer(handle); - 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; + } + } } - free(handle); - - MSG("Consumer disabled for session %s", session_name); - -error: - return ret; +end: + free(uris); + return descriptor; } /* @@ -251,150 +281,366 @@ error: */ 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], *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"); + 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 = CMD_ERROR; goto error; } - session_name = session_name_date; - DBG("Auto session name set to %s", session_name_date); - } else { - if (strncmp(opt_session_name, DEFAULT_SESSION_NAME, + /* + * Check if the session name begins with "auto-" or is exactly "auto". + * Both are reserved for the default session name. See bug #449 to + * understand why we need to check both here. + */ + if ((strncmp(opt_session_name, DEFAULT_SESSION_NAME "-", + strlen(DEFAULT_SESSION_NAME) + 1) == 0) || + (strncmp(opt_session_name, DEFAULT_SESSION_NAME, strlen(DEFAULT_SESSION_NAME)) == 0 && - strlen(opt_session_name) == strlen(DEFAULT_SESSION_NAME)) { + strlen(opt_session_name) == strlen(DEFAULT_SESSION_NAME))) { ERR("%s is a reserved keyword for default session(s)", DEFAULT_SESSION_NAME); 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_no_consumer) { - url = NULL; - print_str_url = ""; - } else if (opt_output_path != NULL) { - traces_path = utils_expand_path(opt_output_path); - if (traces_path == NULL) { - ret = CMD_ERROR; - goto error; - } + if (opt_snapshot && opt_live_timer) { + ERR("Snapshot and live modes are mutually exclusive."); + 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; - } - /* 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_ctrl_url == NULL && opt_data_url == NULL) { - /* Auto output path */ - alloc_path = config_get_default_path(); - if (alloc_path == NULL) { - ERR("HOME path not found.\n \ - Please specify an output path using -o, --output PATH"); - ret = CMD_FATAL; - goto error; - } - alloc_path = strdup(alloc_path); + if ((!opt_ctrl_url && opt_data_url) || (opt_ctrl_url && !opt_data_url)) { + ERR("Both control and data URLs must be specified."); + ret = CMD_ERROR; + goto error; + } - ret = asprintf(&alloc_url, - "file://%s/" DEFAULT_TRACE_DIR_NAME "/%s", - alloc_path, session_name_date); - if (ret < 0) { - PERROR("asprintf trace dir name"); - ret = CMD_FATAL; - 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; + } - url = alloc_url; - print_str_url = alloc_url + strlen("file://"); + 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_create_session_ext(session_name, url, datetime); + ret = lttng_list_sessions(&sessions); 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); + 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; } + } + if (!created_session) { + ERR("Failed to fetch properties of created session"); + ret = CMD_ERROR; goto error; } - MSG("Session %s created.", session_name); - MSG("Traces will be written in %s", print_str_url); + if (opt_shm_path) { + char datetime_suffix[17] = {}; + + /* + * An auto-generated session name already includes the creation + * timestamp. + */ + 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; + } + } - if (opt_ctrl_url || opt_data_url) { - /* Setting up control URI (-C or/and -D opt) */ - ret = set_consumer_url(session_name, opt_ctrl_url, opt_data_url); + 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) { + lttng_destroy_session(created_session_name); + ret = CMD_ERROR; goto error; } + } + + 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 { + MSG("Session %s created.", created_session_name); + } + + 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 = enable_consumer(session_name); + ret = lttng_snapshot_list_output(created_session_name, &list); if (ret < 0) { + ERR("Failed to list snapshot outputs."); + ret = CMD_ERROR; goto error; } + + while ((iter = lttng_snapshot_output_list_get_next(list))) { + const char *url = NULL; + + 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; + } + lttng_snapshot_output_list_destroy(list); + + if (*snapshot_url) { + MSG("Default snapshot output set to %s", + snapshot_url); + } + 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); } - if (opt_disable_consumer && !opt_no_consumer) { - ret = disable_consumer(session_name); - if (ret < 0) { + /* Mi output */ + if (lttng_opt_mi) { + ret = mi_created_session(created_session_name); + if (ret) { + ret = CMD_ERROR; goto error; } } /* Init lttng session config */ - ret = config_init(session_name); + ret = config_init(created_session_name); if (ret < 0) { ret = CMD_ERROR; goto error; } - ret = CMD_SUCCESS; - error: - if (alloc_url) { - free(alloc_url); + 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 { + PERROR("execlp"); + } + 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; + } + +end: + return ret; +} + +/* + * 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; + } + + /* Try command line option path */ + pathname = opt_sessiond_path; + + /* Try LTTNG_SESSIOND_PATH env variable */ + if (pathname == NULL) { + pathname = getenv(DEFAULT_SESSIOND_PATH_ENV); + } + + /* Try with configured path */ + if (pathname == NULL) { + if (CONFIG_SESSIOND_BIN[0] != '\0') { + pathname = CONFIG_SESSIOND_BIN; + } } - if (traces_path) { - free(traces_path); + /* Try the default path */ + if (pathname == NULL) { + pathname = INSTALL_BIN_PATH "/lttng-sessiond"; } - free(alloc_path); + 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; } @@ -405,7 +651,9 @@ error: */ 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); @@ -414,23 +662,146 @@ int cmd_create(int argc, const char **argv) 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: + { + uint64_t v; + + errno = 0; + opt_arg = poptGetOptArg(pc); + if (!opt_arg) { + /* Set up default values. */ + opt_live_timer = (uint32_t) DEFAULT_LTTNG_LIVE_TIMER; + DBG("Session live timer interval set to default value %d", + opt_live_timer); + break; + } + + 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; } } + if (opt_no_consumer) { + MSG("The option --no-consumer is obsolete. Use --no-output now."); + ret = CMD_WARNING; + goto end; + } + + 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; }