* 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 <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <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/sessiond-comm/sessiond-comm.h>
#include <common/uri.h>
#include <common/utils.h>
+#include <lttng/snapshot.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_disable_consumer;
+static int opt_no_output;
+static int opt_snapshot;
+static unsigned int opt_live_timer;
enum {
OPT_HELP = 1,
OPT_LIST_OPTIONS,
+ OPT_LIVE_TIMER,
};
+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},
{"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-consumer", 0, POPT_ARG_VAL, &opt_no_consumer, 1, 0, 0},
- {"disable-consumer", 0, POPT_ARG_VAL, &opt_disable_consumer, 1, 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}
};
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-<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, "\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");
+ int ret, i, count, found;
+ struct lttng_session *sessions;
+
+ /* session_name should not be null */
+ assert(session_name);
+ assert(writer);
+
+ count = lttng_list_sessions(&sessions);
+ if (count < 0) {
+ ret = count;
+ ERR("%s", lttng_strerror(ret));
+ goto error;
+ }
+
+ if (count == 0) {
+ ERR("Error session creation failed: session %s not found", session_name);
+ ret = -LTTNG_ERR_SESS_NOT_FOUND;
+ goto end;
+ }
+
+ 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 (!found) {
+ ret = -LTTNG_ERR_SESS_NOT_FOUND;
+ } else {
+ ret = CMD_SUCCESS;
+ }
+
+error:
+ free(sessions);
+end:
+ return ret;
}
/*
{
int ret;
struct lttng_handle *handle;
- struct lttng_domain dom;
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.
+ * Set handle with the session_name, but no domain. This implies that
+ * the actions taken with this handle apply on the tracing session
+ * rather then the domain-specific session.
*/
- memset(&dom, 0, sizeof(dom));
-
- handle = lttng_create_handle(session_name, &dom);
+ handle = lttng_create_handle(session_name, NULL);
if (handle == NULL) {
ret = CMD_FATAL;
goto error;
return ret;
}
+static int add_snapshot_output(const char *session_name, const char *ctrl_url,
+ const char *data_url)
+{
+ int ret;
+ struct lttng_snapshot_output *output = NULL;
+
+ assert(session_name);
+
+ output = lttng_snapshot_output_create();
+ if (!output) {
+ ret = CMD_FATAL;
+ goto error_create;
+ }
+
+ if (ctrl_url) {
+ ret = lttng_snapshot_output_set_ctrl_url(ctrl_url, output);
+ if (ret < 0) {
+ goto error;
+ }
+ }
+
+ if (data_url) {
+ ret = lttng_snapshot_output_set_data_url(data_url, output);
+ if (ret < 0) {
+ goto error;
+ }
+ }
+
+ /* This call, if successful, populates the id of the output object. */
+ ret = lttng_snapshot_add_output(session_name, output);
+ if (ret < 0) {
+ goto error;
+ }
+
+error:
+ lttng_snapshot_output_destroy(output);
+error_create:
+ return ret;
+}
+
/*
* Create a tracing session.
* If no name is specified, a default name is generated.
char session_name_date[NAME_MAX + 17], *print_str_url = NULL;
time_t rawtime;
struct tm *timeinfo;
+ char shm_path[PATH_MAX] = "";
/* Get date and time for automatic session name/path */
time(&rawtime);
}
}
+ if ((!opt_ctrl_url && opt_data_url) || (opt_ctrl_url && !opt_data_url)) {
+ ERR("You need both control and data URL.");
+ ret = CMD_ERROR;
+ goto error;
+ }
+
if (opt_output_path != NULL) {
traces_path = utils_expand_path(opt_output_path);
if (traces_path == NULL) {
goto error;
}
- /* Create URL string from the local filesytem path */
+ /* Create URL string from the local file system path */
ret = asprintf(&alloc_url, "file://%s", traces_path);
if (ret < 0) {
PERROR("asprintf url path");
} else if (opt_url) { /* Handling URL (-U opt) */
url = opt_url;
print_str_url = url;
- } else {
+ } else if (opt_data_url && opt_ctrl_url) {
+ /*
+ * With both control and data, we'll be setting the consumer URL after
+ * session creation thus use no URL.
+ */
+ url = NULL;
+ } else if (!opt_no_output) {
+ char *tmp_path;
+
/* Auto output path */
- alloc_path = utils_get_home_dir();
- if (alloc_path == NULL) {
+ tmp_path = utils_get_home_dir();
+ if (tmp_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);
-
+ alloc_path = strdup(tmp_path);
+ if (!alloc_path) {
+ PERROR("allocating alloc_path");
+ ret = CMD_FATAL;
+ goto error;
+ }
ret = asprintf(&alloc_url,
"file://%s/" DEFAULT_TRACE_DIR_NAME "/%s",
alloc_path, session_name_date);
}
url = alloc_url;
- if (!opt_data_url && !opt_ctrl_url) {
- print_str_url = alloc_url + strlen("file://");
+ print_str_url = alloc_url + strlen("file://");
+ } else {
+ /* No output means --no-output or --snapshot mode. */
+ url = NULL;
+ }
+
+ /* 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 (ret < 0) {
+ PERROR("asprintf default live URL");
+ ret = CMD_FATAL;
+ goto error;
}
+ url = alloc_url;
+ print_str_url = url;
}
- if ((!opt_ctrl_url && opt_data_url) || (opt_ctrl_url && !opt_data_url)) {
- ERR("You need both control and data URL.");
+ if (opt_snapshot && opt_live_timer) {
+ ERR("Snapshot and live modes are mutually exclusive.");
ret = CMD_ERROR;
goto error;
}
- ret = _lttng_create_session_ext(session_name, url, datetime);
+ if (opt_snapshot) {
+ /* No output by default. */
+ const char *snapshot_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;
+ }
+ ret = lttng_create_session_snapshot(session_name, snapshot_url);
+ } else if (opt_live_timer) {
+ const char *pathname;
+
+ if (opt_relayd_path) {
+ pathname = opt_relayd_path;
+ } else {
+ pathname = INSTALL_BIN_PATH "/lttng-relayd";
+ }
+ if (!opt_url && !opt_data_url && !check_relayd() &&
+ spawn_relayd(pathname, 0) < 0) {
+ goto error;
+ }
+ ret = lttng_create_session_live(session_name, url, opt_live_timer);
+ } else {
+ ret = _lttng_create_session_ext(session_name, url, datetime);
+ }
if (ret < 0) {
/* Don't set ret so lttng can interpret the sessiond error. */
switch (-ret) {
}
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);
+ if (opt_snapshot) {
+ ret = add_snapshot_output(session_name, opt_ctrl_url,
+ opt_data_url);
+ } else {
+ /* Setting up control URI (-C or/and -D opt) */
+ ret = set_consumer_url(session_name, opt_ctrl_url, opt_data_url);
+ }
if (ret < 0) {
/* Destroy created session because the URL are not valid. */
lttng_destroy_session(session_name);
}
}
+ if (opt_shm_path) {
+ ret = snprintf(shm_path, sizeof(shm_path),
+ "%s/%s", opt_shm_path, session_name_date);
+ if (ret < 0) {
+ PERROR("snprintf shm_path");
+ goto error;
+ }
+
+ ret = lttng_set_session_shm_path(session_name, shm_path);
+ if (ret < 0) {
+ lttng_destroy_session(session_name);
+ goto error;
+ }
+ }
+
MSG("Session %s created.", session_name);
- if (print_str_url) {
+ if (print_str_url && !opt_snapshot) {
MSG("Traces will be written in %s", print_str_url);
+
+ 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 to mmap output, and default to overwrite mode.");
+ }
+ if (opt_shm_path) {
+ MSG("Session %s set to shm_path: %s.", session_name,
+ shm_path);
+ }
+
+ /* Mi output */
+ if (lttng_opt_mi) {
+ ret = mi_created_session(session_name);
+ if (ret) {
+ ret = CMD_ERROR;
+ goto error;
+ }
}
/* Init lttng session config */
return ret;
}
+/*
+ * spawn_sessiond
+ *
+ * Spawn a session daemon by forking and execv.
+ */
+static int spawn_sessiond(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;
+ 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;
+ }
+ }
+
+ /* 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("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;
+}
+
/*
* The 'create <options>' first level command
*
*/
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;
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;
+
+ 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;
+ }
+
+ v = strtoul(opt_arg, NULL, 0);
+ if (errno != 0 || !isdigit(opt_arg[0])) {
+ ERR("Wrong value in --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.");
+ 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;
- 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();
+ 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