+++ /dev/null
-/*
- * Copyright (c) 2011 David Goulet <david.goulet@polymtl.ca>
- *
- * 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
- * as published by the Free Software Foundation; only version 2
- * of the License.
- *
- * 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
-#include <getopt.h>
-#include <signal.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <config.h>
-
-#include <lttng/lttng.h>
-
-#include "cmd.h"
-#include "conf.h"
-#include "lttngerr.h"
-
-/* Variables */
-static char *progname;
-
-int opt_quiet;
-int opt_verbose;
-static int opt_no_sessiond;
-static char *opt_sessiond_path;
-
-enum {
- OPT_SESSION_PATH,
- OPT_DUMP_OPTIONS,
- OPT_DUMP_COMMANDS,
-};
-
-/* Getopt options. No first level command. */
-static struct option long_options[] = {
- {"help", 0, NULL, 'h'},
- {"group", 1, NULL, 'g'},
- {"verbose", 0, NULL, 'v'},
- {"quiet", 0, NULL, 'q'},
- {"no-sessiond", 0, NULL, 'n'},
- {"sessiond-path", 1, NULL, OPT_SESSION_PATH},
- {"list-options", 0, NULL, OPT_DUMP_OPTIONS},
- {"list-commands", 0, NULL, OPT_DUMP_COMMANDS},
- {NULL, 0, NULL, 0}
-};
-
-/* First level command */
-static struct cmd_struct commands[] = {
- { "list", cmd_list},
- { "create", cmd_create},
- { "destroy", cmd_destroy},
- { "start", cmd_start},
- { "stop", cmd_stop},
- { "enable-event", cmd_enable_events},
- { "disable-event", cmd_disable_events},
- { "enable-channel", cmd_enable_channels},
- { "disable-channel", cmd_disable_channels},
- { "add-context", cmd_add_context},
- { "set-session", cmd_set_session},
- { "version", cmd_version},
- { "calibrate", cmd_calibrate},
- { NULL, NULL} /* Array closure */
-};
-
-static void usage(FILE *ofp)
-{
- fprintf(ofp, "LTTng Trace Control " VERSION"\n\n");
- fprintf(ofp, "usage: lttng [options] <command>\n");
- fprintf(ofp, "\n");
- fprintf(ofp, "Options:\n");
- fprintf(ofp, " -h, --help Show this help\n");
- fprintf(ofp, " -g, --group NAME Unix tracing group name. (default: tracing)\n");
- fprintf(ofp, " -v, --verbose Verbose mode\n");
- fprintf(ofp, " -q, --quiet Quiet mode\n");
- fprintf(ofp, " -n, --no-sessiond Don't spawn a session daemon\n");
- fprintf(ofp, " --sessiond-path Session daemon full path\n");
- fprintf(ofp, " --list-options Simple listing of lttng options\n");
- fprintf(ofp, " --list-commands Simple listing of lttng commands\n");
- fprintf(ofp, "\n");
- fprintf(ofp, "Commands:\n");
- fprintf(ofp, " add-context Add context to event or/and channel\n");
- fprintf(ofp, " calibrate Quantify LTTng overhead\n");
- fprintf(ofp, " create Create tracing session\n");
- fprintf(ofp, " destroy Teardown tracing session\n");
- fprintf(ofp, " enable-channel Enable tracing channel\n");
- fprintf(ofp, " enable-event Enable tracing event\n");
- fprintf(ofp, " disable-channel Disable tracing channel\n");
- fprintf(ofp, " disable-event Disable tracing event\n");
- fprintf(ofp, " list List possible tracing options\n");
- fprintf(ofp, " set-session Set current session name\n");
- fprintf(ofp, " start Start tracing\n");
- fprintf(ofp, " stop Stop tracing\n");
- fprintf(ofp, " version Show version information\n");
- fprintf(ofp, "\n");
- fprintf(ofp, "Please see the lttng(1) man page for full documentation.\n");
- fprintf(ofp, "See http://lttng.org for updates, bug reports and news.\n");
-}
-
-/*
- * list_options
- *
- * List options line by line. This is mostly for bash auto completion and to
- * avoid difficult parsing.
- */
-static void list_options(FILE *ofp)
-{
- int i = 0;
- struct option *option = NULL;
-
- option = &long_options[i];
- while (option->name != NULL) {
- fprintf(ofp, "--%s\n", option->name);
-
- if (isprint(option->val)) {
- fprintf(ofp, "-%c\n", option->val);
- }
-
- i++;
- option = &long_options[i];
- }
-}
-
-/*
- * list_commands
- *
- * List commands line by line. This is mostly for bash auto completion and to
- * avoid difficult parsing.
- */
-static void list_commands(FILE *ofp)
-{
- int i = 0;
- struct cmd_struct *cmd = NULL;
-
- cmd = &commands[i];
- while (cmd->name != NULL) {
- fprintf(ofp, "%s\n", cmd->name);
- i++;
- cmd = &commands[i];
- }
-}
-
-/*
- * clean_exit
- */
-static void clean_exit(int code)
-{
- DBG("Clean exit");
- exit(code);
-}
-
-/*
- * sighandler
- *
- * Signal handler for the daemon
- */
-static void sighandler(int sig)
-{
- switch (sig) {
- case SIGTERM:
- DBG("SIGTERM catched");
- clean_exit(EXIT_FAILURE);
- break;
- case SIGCHLD:
- /* Notify is done */
- DBG("SIGCHLD catched");
- break;
- default:
- DBG("Unknown signal %d catched", sig);
- break;
- }
-
- return;
-}
-
-/*
- * set_signal_handler
- *
- * Setup signal handler for SIGCHLD and SIGTERM.
- */
-static int set_signal_handler(void)
-{
- int ret = 0;
- struct sigaction sa;
- sigset_t sigset;
-
- if ((ret = sigemptyset(&sigset)) < 0) {
- perror("sigemptyset");
- goto end;
- }
-
- sa.sa_handler = sighandler;
- sa.sa_mask = sigset;
- sa.sa_flags = 0;
- if ((ret = sigaction(SIGCHLD, &sa, NULL)) < 0) {
- perror("sigaction");
- goto end;
- }
-
- if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
- perror("sigaction");
- goto end;
- }
-
-end:
- return ret;
-}
-
-/*
- * handle_command
- *
- * Handle the full argv list of a first level command. Will find the command
- * in the global commands array and call the function callback associated.
- *
- * If command not found, return -1
- * else, return function command error code.
- */
-static int handle_command(int argc, char **argv)
-{
- int i = 0, ret;
- struct cmd_struct *cmd;
-
- if (*argv == NULL) {
- ret = CMD_SUCCESS;
- goto end;
- }
-
- cmd = &commands[i];
- while (cmd->func != NULL) {
- /* Find command */
- if (strcmp(argv[0], cmd->name) == 0) {
- ret = cmd->func(argc, (const char**) argv);
- switch (ret) {
- case CMD_ERROR:
- ERR("Command error");
- break;
- case CMD_NOT_IMPLEMENTED:
- ERR("Options not implemented");
- break;
- case CMD_UNDEFINED:
- ERR("Undefined command");
- break;
- case CMD_FATAL:
- ERR("Fatal error");
- break;
- }
- goto end;
- }
- i++;
- cmd = &commands[i];
- }
-
- /* Command not found */
- ret = -1;
-
-end:
- 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 and tell
- * it to signal us when ready.
- */
- execlp(pathname, "lttng-sessiond", "--sig-parent", "--quiet", NULL);
- /* execlp only returns if error happened */
- if (errno == ENOENT) {
- ERR("No session daemon found. Use --sessiond-path.");
- } else {
- perror("execlp");
- }
- kill(getppid(), SIGTERM); /* unpause parent */
- exit(EXIT_FAILURE);
- } else if (pid > 0) {
- /* Wait for lttng-sessiond to start */
- pause();
- goto end;
- } else {
- perror("fork");
- ret = -1;
- goto end;
- }
-
-end:
- return ret;
-}
-
-/*
- * check_sessiond
- *
- * Check if the session daemon is available using
- * the liblttngctl API for the check. If not, try to
- * spawn a daemon.
- */
-static int check_sessiond(void)
-{
- int ret;
- char *pathname = NULL, *alloc_pathname = NULL;
-
- ret = lttng_session_daemon_alive();
- if (ret == 0) { /* not alive */
- /* Try command line option path */
- if (opt_sessiond_path != NULL) {
- ret = access(opt_sessiond_path, F_OK | X_OK);
- if (ret < 0) {
- ERR("No such file: %s", opt_sessiond_path);
- goto end;
- }
- pathname = opt_sessiond_path;
- } else {
- /* Try LTTNG_SESSIOND_PATH env variable */
- pathname = getenv(LTTNG_SESSIOND_PATH_ENV);
- }
-
- /* Let's rock and roll */
- if (pathname == NULL) {
- ret = asprintf(&alloc_pathname, INSTALL_BIN_PATH "/lttng-sessiond");
- if (ret < 0) {
- perror("asprintf spawn sessiond");
- goto end;
- }
- pathname = alloc_pathname;
- }
-
- ret = spawn_sessiond(pathname);
- free(alloc_pathname);
- if (ret < 0) {
- ERR("Problem occurs when starting %s", pathname);
- goto end;
- }
- }
-
-end:
- return ret;
-}
-
-/*
- * Check for the "help" option in the argv. If found, return 1 else return 0.
- */
-static int check_help_command(int argc, char **argv)
-{
- int i;
-
- for (i = 0; i < argc; i++) {
- if ((strncmp(argv[i], "-h", 2) == 0) ||
- strncmp(argv[i], "--h", 3) == 0) {
- return 1;
- }
- }
-
- return 0;
-}
-
-/*
- * parse_args
- *
- * Parse command line arguments.
- * Return 0 if OK, else -1
- */
-static int parse_args(int argc, char **argv)
-{
- int opt, ret;
-
- if (argc < 2) {
- usage(stderr);
- clean_exit(EXIT_FAILURE);
- }
-
- while ((opt = getopt_long(argc, argv, "+hnvqg:", long_options, NULL)) != -1) {
- switch (opt) {
- case 'h':
- usage(stderr);
- goto error;
- case 'v':
- opt_verbose += 1;
- break;
- case 'q':
- opt_quiet = 1;
- break;
- case 'g':
- lttng_set_tracing_group(optarg);
- break;
- case 'n':
- opt_no_sessiond = 1;
- break;
- case OPT_SESSION_PATH:
- opt_sessiond_path = strdup(optarg);
- break;
- case OPT_DUMP_OPTIONS:
- list_options(stdout);
- ret = 0;
- goto error;
- case OPT_DUMP_COMMANDS:
- list_commands(stdout);
- ret = 0;
- goto error;
- default:
- usage(stderr);
- goto error;
- }
- }
-
- /* If both options are specified, quiet wins */
- if (opt_verbose && opt_quiet) {
- opt_verbose = 0;
- }
-
- /* Spawn session daemon if needed */
- if (opt_no_sessiond == 0 && check_help_command(argc, argv) == 0 &&
- (check_sessiond() < 0)) {
- goto error;
- }
-
- /* No leftovers, print usage and quit */
- if ((argc - optind) == 0) {
- usage(stderr);
- goto error;
- }
-
- /*
- * Handle leftovers which is a first level command with the trailing
- * options.
- */
- ret = handle_command(argc - optind, argv + optind);
- if (ret < 0) {
- if (ret == -1) {
- usage(stderr);
- } else {
- ERR("%s", lttng_strerror(ret));
- }
- goto error;
- }
-
- return 0;
-
-error:
- return -1;
-}
-
-
-/*
- * main
- */
-int main(int argc, char *argv[])
-{
- int ret;
-
- progname = argv[0] ? argv[0] : "lttng";
-
- /* For Mathieu Desnoyers aka Dr Tracing */
- if (strncmp(progname, "drtrace", 7) == 0) {
- MSG("%c[%d;%dmWelcome back Dr Tracing!%c[%dm\n\n", 27,1,33,27,0);
- }
-
- ret = set_signal_handler();
- if (ret < 0) {
- clean_exit(ret);
- }
-
- ret = parse_args(argc, argv);
- if (ret < 0) {
- clean_exit(EXIT_FAILURE);
- }
-
- return 0;
-}
projects / lttng-tools.git / blobdiff