-/* Copyright (c) 2011 David Goulet <david.goulet@polymtl.ca>
+/*
+ * 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
* 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 <sys/wait.h>
#include <unistd.h>
-#include <lttng/liblttngctl.h>
+#include <lttng/lttng.h>
#include "lttng.h"
#include "lttngerr.h"
/* Variables */
static char *progname;
+static char short_uuid[9];
/* Prototypes */
static int process_client_opt(void);
static int process_opt_list_apps(void);
+static int process_opt_list_sessions(void);
+static int process_opt_list_traces(void);
+static int process_opt_create_session(void);
+static int process_opt_session_uuid(void);
+static void sighandler(int sig);
+static void shorten_uuid(char *in, char *out);
+static int set_signal_handler(void);
+static int validate_options(void);
+static char *get_cmdline_by_pid(pid_t pid);
/*
* start_client
static int process_client_opt(void)
{
int ret;
-
- /* Connect to the session daemon */
- ret = lttng_connect_sessiond();
- if (ret < 0) {
- ERR("%s", lttng_get_readable_code(ret));
- goto end;
- }
+ uuid_t uuid;
if (opt_list_apps) {
ret = process_opt_list_apps();
if (ret < 0) {
- ERR("%s", lttng_get_readable_code(ret));
goto end;
}
}
+ if (opt_list_session) {
+ ret = process_opt_list_sessions();
+ if (ret < 0) {
+ goto end;
+ }
+ }
+
+ if (opt_list_traces) {
+ ret = process_opt_list_traces();
+ if (ret < 0) {
+ goto end;
+ }
+ }
+
+ if (opt_create_session != NULL) {
+ ret = process_opt_create_session();
+ if (ret < 0) {
+ goto end;
+ }
+ }
+
+ if (opt_destroy_session != NULL) {
+ uuid_parse(opt_destroy_session, uuid);
+ ret = lttng_destroy_session(&uuid);
+ if (ret < 0) {
+ goto end;
+ }
+ }
+
+ if (opt_session_uuid != NULL) {
+ DBG("Set session uuid to %s", short_uuid);
+ ret = process_opt_session_uuid();
+ if (ret < 0) {
+ ERR("Session UUID %s not found", opt_session_uuid);
+ goto error;
+ }
+ }
+
+ if (opt_trace_kernel) {
+ ERR("Not implemented yet");
+ goto end;
+ }
+
+ if (opt_trace_pid != 0) {
+ if (opt_create_trace) {
+ DBG("Create a userspace trace for pid %d", opt_trace_pid);
+ ret = lttng_ust_create_trace(opt_trace_pid);
+ if (ret < 0) {
+ goto end;
+ }
+ MSG("Trace created successfully!\nUse --start to start tracing.");
+ }
+
+ if (opt_start_trace) {
+ DBG("Start trace for pid %d", opt_trace_pid);
+ ret = lttng_ust_start_trace(opt_trace_pid);
+ if (ret < 0) {
+ goto end;
+ }
+ MSG("Trace started successfully!");
+ } else if (opt_stop_trace) {
+ DBG("Stop trace for pid %d", opt_trace_pid);
+ ret = lttng_ust_stop_trace(opt_trace_pid);
+ if (ret < 0) {
+ goto end;
+ }
+ MSG("Trace stopped successfully!");
+ }
+
+ }
+
return 0;
end:
+ ERR("%s", lttng_get_readable_code(ret));
+ return ret;
+
+error:
+ return ret;
+}
+
+/*
+ * process_opt_session_uuid
+ *
+ * Set current session uuid to the current flow of
+ * command(s) using the already shorten uuid.
+ */
+static int process_opt_session_uuid(void)
+{
+ int ret, count, i;
+ struct lttng_session *sessions;
+
+ count = lttng_list_sessions(&sessions);
+ if (count < 0) {
+ ret = count;
+ goto error;
+ }
+
+ for (i = 0; i < count; i++) {
+ if (strncmp(sessions[i].uuid, short_uuid, 8) == 0) {
+ lttng_set_current_session_uuid(sessions[i].uuid);
+ break;
+ }
+ }
+
+ free(sessions);
+
+ return 0;
+
+error:
+ return ret;
+}
+
+/*
+ * process_opt_list_traces
+ *
+ * Get list of all traces for a specific session uuid.
+ */
+static int process_opt_list_traces(void)
+{
+ int ret, i;
+ uuid_t uuid;
+ struct lttng_trace *traces;
+
+ uuid_parse(opt_session_uuid, uuid);
+ ret = lttng_list_traces(&uuid, &traces);
+ if (ret < 0) {
+ goto error;
+ }
+
+ MSG("Userspace traces:");
+ for (i = 0; i < ret; i++) {
+ if (traces[i].type == USERSPACE) {
+ MSG("\t%d) %s (pid: %d): %s",
+ i, traces[i].name, traces[i].pid,
+ get_cmdline_by_pid(traces[i].pid));
+ } else {
+ break;
+ }
+ }
+
+ MSG("Kernel traces:");
+ for (;i < ret; i++) {
+ if (traces[i].type == KERNEL) {
+ MSG("\t%d) %s", i, traces[i].name);
+ }
+ }
+
+ free(traces);
+
+error:
+ return ret;
+}
+
+/*
+ * process_opt_create_session
+ *
+ * Create a new session using the name pass
+ * to the command line.
+ */
+static int process_opt_create_session(void)
+{
+ int ret;
+ uuid_t session_id;
+ char str_uuid[37];
+
+ ret = lttng_create_session(opt_create_session, &session_id);
+ if (ret < 0) {
+ goto error;
+ }
+
+ uuid_unparse(session_id, str_uuid);
+
+ MSG("Session created:");
+ MSG(" %s (%s)", opt_create_session, str_uuid);
+
+error:
+ return ret;
+}
+
+/*
+ * extract_short_uuid
+ *
+ * Extract shorten uuid and copy it to out.
+ * Shorten uuid format : '<name>.<short_uuid>'
+ */
+static int extract_short_uuid(char *in, char *out)
+{
+ char *tok;
+
+ tok = strchr(in, '.');
+ if (strlen(tok+1) == 8) {
+ memcpy(out, tok+1, 8);
+ out[9] = '\0';
+ return 0;
+ }
+
+ return -1;
+}
+
+/*
+ * shorten_uuid
+ *
+ * Small function to shorten the 37 bytes long uuid_t
+ * string representation to 8 characters.
+ */
+static void shorten_uuid(char *in, char *out)
+{
+ memcpy(out, in, 8);
+ out[8] = '\0';
+}
+
+/*
+ * process_opt_list_sessions
+ *
+ * Get the list of available sessions from
+ * the session daemon and print it to user.
+ */
+static int process_opt_list_sessions(void)
+{
+ int ret, count, i;
+ char tmp_short_uuid[9];
+ struct lttng_session *sess;
+
+ count = lttng_list_sessions(&sess);
+ DBG("Session count %d", count);
+ if (count < 0) {
+ ret = count;
+ goto error;
+ }
+
+ MSG("Available sessions (UUIDs):");
+ for (i = 0; i < count; i++) {
+ shorten_uuid(sess[i].uuid, tmp_short_uuid);
+ MSG(" %d) %s.%s", i+1, sess[i].name, tmp_short_uuid);
+ }
+
+ free(sess);
+ MSG("\nTo select a session, use -s, --session UUID.");
+
+ return 0;
+
+error:
return ret;
}
*/
static int process_opt_list_apps(void)
{
- int i, ret;
+ int i, ret, count;
pid_t *pids;
- FILE *fp;
- char path[24]; /* Can't go bigger than /proc/65535/cmdline */
- char cmdline[PATH_MAX];
+ char *cmdline;
- ret = lttng_ust_list_apps(&pids);
- if (ret < 0) {
+ count = lttng_ust_list_apps(&pids);
+ if (count < 0) {
+ ret = count;
goto error;
}
MSG("LTTng UST traceable application [name (pid)]:");
- for (i=0; i < ret; i++) {
- snprintf(path, sizeof(path), "/proc/%d/cmdline", pids[i]);
- fp = fopen(path, "r");
- if (fp == NULL) {
+ for (i=0; i < count; i++) {
+ cmdline = get_cmdline_by_pid(pids[i]);
+ if (cmdline == NULL) {
+ MSG("\t(not running) (%d)", pids[i]);
continue;
}
- ret = fread(cmdline, 1, sizeof(cmdline), fp);
MSG("\t%s (%d)", cmdline, pids[i]);
- fclose(fp);
+ free(cmdline);
}
+ /* Allocated by lttng_ust_list_apps() */
+ free(pids);
+
return 0;
error:
return ret;
}
+/*
+ * get_cmdline_by_pid
+ *
+ * Get command line from /proc for a specific pid.
+ *
+ * On success, return an allocated string pointer pointing to
+ * the proc cmdline.
+ * On error, return NULL.
+ */
+static char *get_cmdline_by_pid(pid_t pid)
+{
+ int ret;
+ FILE *fp;
+ char *cmdline = NULL;
+ char path[24]; /* Can't go bigger than /proc/65535/cmdline */
+
+ snprintf(path, sizeof(path), "/proc/%d/cmdline", pid);
+ fp = fopen(path, "r");
+ if (fp == NULL) {
+ goto end;
+ }
+
+ /* Caller must free() *cmdline */
+ cmdline = malloc(PATH_MAX);
+ ret = fread(cmdline, 1, PATH_MAX, fp);
+ fclose(fp);
+
+end:
+ return cmdline;
+}
+
+/*
+ * validate_options
+ *
+ * Make sure that all options passed to the command line
+ * are compatible with each others.
+ *
+ * On error, return -1
+ * On success, return 0
+ */
+static int validate_options(void)
+{
+ int ret;
+
+ /* Conflicting command */
+ if (opt_start_trace && opt_stop_trace) {
+ ERR("Can't use --start and --stop together.");
+ goto error;
+ /* Must have a session UUID for trace action. */
+ } else if ((opt_session_uuid == NULL) &&
+ (opt_create_trace || opt_start_trace || opt_stop_trace || opt_list_traces)) {
+ ERR("You need to specify a session UUID.\nPlease use --session UUID to do so.");
+ goto error;
+ /* If no PID specified and trace_kernel is off */
+ } else if ((opt_trace_pid == 0 && opt_trace_kernel == 0) &&
+ (opt_create_trace || opt_start_trace || opt_stop_trace)) {
+ ERR("Please specify a PID using -p, --pid PID.");
+ goto error;
+ }
+
+ if (opt_session_uuid != NULL) {
+ ret = extract_short_uuid(opt_session_uuid, short_uuid);
+ if (ret < 0) {
+ ERR("Session UUID not valid. Must be <name>.<short_uuid>");
+ goto error;
+ }
+ }
+
+ return 0;
+
+error:
+ return -1;
+}
+
+/*
+ * spawn_sessiond
+ *
+ * Spawn a session daemon by forking and execv.
+ */
+static int spawn_sessiond(char *pathname)
+{
+ int ret = 0;
+ pid_t pid;
+
+ MSG("Spawning session daemon");
+ pid = fork();
+ if (pid == 0) {
+ /* Spawn session daemon and tell
+ * it to signal us when ready.
+ */
+ ret = execlp(pathname, "ltt-sessiond", "--sig-parent", "--quiet", NULL);
+ if (ret < 0) {
+ if (errno == ENOENT) {
+ ERR("No session daemon found. Use --sessiond-path.");
+ } else {
+ perror("execlp");
+ }
+ kill(getppid(), SIGTERM);
+ exit(EXIT_FAILURE);
+ }
+ exit(EXIT_SUCCESS);
+ } else if (pid > 0) {
+ /* Wait for ltt-sessiond to start */
+ pause();
+ goto end;
+ } else {
+ perror("fork");
+ ret = -1;
+ goto end;
+ }
+
+end:
+ return ret;
+}
+
/*
* check_ltt_sessiond
*
* Check if the session daemon is available using
- * the liblttngctl API for the check.
+ * the liblttngctl API for the check. If not, try to
+ * spawn a daemon.
*/
static int check_ltt_sessiond(void)
{
int ret;
+ char *pathname = NULL;
ret = lttng_check_session_daemon();
if (ret < 0) {
- ERR("No session daemon found. Aborting.");
+ /* 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);
+ if (pathname != NULL) {
+ /* strdup here in order to make the free()
+ * not fail later on.
+ */
+ pathname = strdup(pathname);
+ }
+ }
+
+ /* Let's rock and roll */
+ if (pathname == NULL) {
+ ret = asprintf(&pathname, "ltt-sessiond");
+ if (ret < 0) {
+ goto end;
+ }
+ }
+
+ ret = spawn_sessiond(pathname);
+ free(pathname);
+ if (ret < 0) {
+ ERR("Problem occurs when starting %s", pathname);
+ goto end;
+ }
+ }
+
+end:
+ return ret;
+}
+
+/*
+ * 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;
}
+/*
+ * 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;
+}
/*
* clean_exit
}
/*
- * main
+ * main
*/
int main(int argc, char *argv[])
{
}
ret = parse_args(argc, (const char **) argv);
+ if (ret < 0) {
+ clean_exit(EXIT_FAILURE);
+ }
+
+ ret = validate_options();
if (ret < 0) {
return EXIT_FAILURE;
}
+ ret = set_signal_handler();
+ if (ret < 0) {
+ clean_exit(ret);
+ }
+
if (opt_tracing_group != NULL) {
DBG("Set tracing group to '%s'", opt_tracing_group);
lttng_set_tracing_group(opt_tracing_group);
DBG("Kernel tracing activated");
if (getuid() != 0) {
ERR("%s must be setuid root", progname);
- return -EPERM;
+ clean_exit(-EPERM);
}
}
/* Check if the lttng session daemon is running.
* If no, a daemon will be spawned.
*/
- if (check_ltt_sessiond() < 0) {
- return EXIT_FAILURE;
+ if (opt_no_sessiond == 0 && (check_ltt_sessiond() < 0)) {
+ clean_exit(EXIT_FAILURE);
}
ret = process_client_opt();
if (ret < 0) {
- return ret;
+ clean_exit(ret);
}
+ clean_exit(0);
+
return 0;
}
projects / lttng-tools.git / blobdiff