-/* 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"
+#include "options.h"
/* Variables */
static char *progname;
+static char *session_name;
+static uuid_t current_uuid;
+static int auto_session;
+static int auto_trace;
/* 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_kernel_list_events(void);
+static int process_opt_create_session(void);
+static int process_kernel_create_trace(void);
+static int process_opt_kernel_event(void);
+static int process_kernel_start_trace(void);
+static int set_session_uuid(void);
+static void sighandler(int sig);
+static int set_signal_handler(void);
+static int validate_options(void);
+static char *get_cmdline_by_pid(pid_t pid);
+static void set_opt_session_info(void);
/*
* start_client
{
int ret;
- /* Connect to the session daemon */
- ret = lttng_connect_sessiond();
- if (ret < 0) {
- ERR("%s", lttng_get_readable_code(ret));
- goto end;
- }
+ set_opt_session_info();
if (opt_list_apps) {
ret = process_opt_list_apps();
if (ret < 0) {
- ERR("%s", lttng_get_readable_code(ret));
goto end;
}
+ goto error;
+ }
+
+ if (opt_list_session) {
+ ret = process_opt_list_sessions();
+ if (ret < 0) {
+ goto end;
+ }
+ goto error;
+ }
+
+ if (opt_list_events) {
+ if (opt_trace_kernel) {
+ ret = process_opt_kernel_list_events();
+ if (ret < 0) {
+ goto end;
+ }
+ } else if (opt_trace_pid != 0) {
+ // TODO
+ }
+ goto error;
+ }
+
+ /* Session creation or auto session set on */
+ if (auto_session || opt_create_session) {
+ DBG("Creating a new session");
+ ret = process_opt_create_session();
+ if (ret < 0) {
+ goto end;
+ }
+ }
+
+ ret = set_session_uuid();
+ if (ret < 0) {
+ ERR("Session %s not found", opt_session_name);
+ goto error;
+ }
+
+ if (opt_destroy_session) {
+ ret = lttng_destroy_session(¤t_uuid);
+ if (ret < 0) {
+ goto end;
+ }
+ MSG("Session %s destroyed.", opt_session_name);
+ }
+
+ if (opt_list_traces) {
+ ret = process_opt_list_traces();
+ if (ret < 0) {
+ goto end;
+ }
+ }
+
+ /*
+ * Action on traces (kernel or/and userspace).
+ */
+
+ if (opt_trace_kernel) {
+ if (auto_trace || opt_create_trace) {
+ DBG("Creating a kernel trace");
+ ret = process_kernel_create_trace();
+ if (ret < 0) {
+ goto end;
+ }
+ }
+
+ if (opt_event_list != NULL || opt_enable_all_event) {
+ ret = process_opt_kernel_event();
+ if (ret < 0) {
+ goto end;
+ }
+ }
+
+ if (auto_trace || opt_start_trace) {
+ DBG("Starting kernel tracing");
+ ret = process_kernel_start_trace();
+ if (ret < 0) {
+ goto end;
+ }
+ }
+
+ if (opt_stop_trace) {
+ DBG("Stopping kernel tracing");
+ ret = lttng_kernel_stop_tracing();
+ if (ret < 0) {
+ goto end;
+ }
+ }
+ }
+
+ if (opt_trace_pid != 0) {
+ if (auto_trace || 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!");
+ }
+
+ if (auto_trace || 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));
+error: /* fall through */
+ return ret;
+}
+
+/*
+ * process_kernel_start_trace
+ *
+ * Start a kernel trace.
+ */
+static int process_kernel_start_trace(void)
+{
+ int ret;
+
+ ret = lttng_kernel_create_stream();
+ if (ret < 0) {
+ goto error;
+ }
+
+ ret = lttng_kernel_start_tracing();
+ if (ret < 0) {
+ goto error;
+ }
+
+ MSG("Kernel tracing started");
+
+ return 0;
+
+error:
+ return ret;
+}
+
+/*
+ * process_kernel_create_trace
+ *
+ * Create a kernel trace.
+ */
+static int process_kernel_create_trace(void)
+{
+ int ret;
+
+ /* Setup kernel session */
+ ret = lttng_kernel_create_session();
+ if (ret < 0) {
+ goto error;
+ }
+
+ /* Create an empty channel (with no event) */
+ ret = lttng_kernel_create_channel();
+ if (ret < 0) {
+ goto error;
+ }
+
+ /* Opening metadata for session */
+ ret = lttng_kernel_open_metadata();
+ if (ret < 0) {
+ goto error;
+ }
+
+ return 0;
+
+error:
+ return ret;
+}
+
+/*
+ * process_opt_kernel_list_events
+ *
+ * Ask for all trace events in the kernel and pretty print them.
+ */
+static int process_opt_kernel_list_events(void)
+{
+ int ret, pos, size;
+ char *event_list, *event, *ptr;
+
+ DBG("Getting all tracing events");
+
+ ret = lttng_kernel_list_events(&event_list);
+ if (ret < 0) {
+ ERR("Unable to list events.");
+ return ret;
+ }
+
+ MSG("Kernel tracepoints:\n-------------");
+
+ ptr = event_list;
+ while ((size = sscanf(ptr, "event { name = %m[^;]; };%n\n", &event, &pos)) == 1) {
+ MSG(" - %s", event);
+ /* Move pointer to the next line */
+ ptr += pos + 1;
+ free(event);
+ }
+
+ free(event_list);
+
+ return 0;
+}
+
+/*
+ * process_opt_kernel_event
+ *
+ * Enable kernel event from the command line list given.
+ */
+static int process_opt_kernel_event(void)
+{
+ int ret;
+ char *event_name;
+
+ if (opt_enable_all_event) {
+ ret = lttng_kernel_enable_event(NULL);
+ if (ret < 0) {
+ ERR("%s", lttng_get_readable_code(ret));
+ } else {
+ MSG("All kernel event enabled");
+ }
+
+ goto end;
}
+ event_name = strtok(opt_event_list, ",");
+ while (event_name != NULL) {
+ DBG("Enabling kernel event %s", event_name);
+ ret = lttng_kernel_enable_event(event_name);
+ if (ret < 0) {
+ ERR("%s %s", lttng_get_readable_code(ret), event_name);
+ } else {
+ MSG("Kernel event %s enabled.", event_name);
+ }
+ /* Next event */
+ event_name = strtok(NULL, ",");
+ }
+
+end:
return 0;
+}
+
+/*
+ * set_opt_session_info
+ *
+ * Setup session_name, current_uuid, short_str_uuid and
+ * long_str_uuid using the command line options.
+ */
+static void set_opt_session_info(void)
+{
+ if (opt_session_name != NULL) {
+ session_name = strndup(opt_session_name, NAME_MAX);
+ DBG("Session name set to %s", session_name);
+ }
+}
+
+/*
+ * set_session_uuid
+ *
+ * Set current session uuid to the current flow of command(s) using the
+ * session_name.
+ */
+static int set_session_uuid(void)
+{
+ int ret, count, i, found = 0;
+ struct lttng_session *sessions;
+
+ if (!uuid_is_null(current_uuid)) {
+ lttng_set_current_session_uuid(¤t_uuid);
+ goto end;
+ }
+
+ count = lttng_list_sessions(&sessions);
+ if (count < 0) {
+ ret = count;
+ goto error;
+ }
+
+ for (i = 0; i < count; i++) {
+ if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) {
+ lttng_set_current_session_uuid(&sessions[i].uuid);
+ uuid_copy(current_uuid, sessions[i].uuid);
+ found = 1;
+ break;
+ }
+ }
+
+ free(sessions);
+
+ if (!found) {
+ return -1;
+ }
end:
+ DBG("Session UUID set");
+ 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;
+ struct lttng_trace *traces;
+
+ ret = lttng_list_traces(¤t_uuid, &traces);
+ DBG("Number of traces to list %d", ret);
+ if (ret < 0) {
+ goto error;
+ }
+
+ /* No traces */
+ if (ret == 0) {
+ MSG("No traces found.");
+ 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;
+ char name[NAME_MAX];
+ time_t rawtime;
+ struct tm *timeinfo;
+
+ /* Auto session name creation */
+ if (opt_session_name == NULL) {
+ time(&rawtime);
+ timeinfo = localtime(&rawtime);
+ strftime(name, sizeof(name), "auto-%Y%m%d-%H%M%S", timeinfo);
+ session_name = strndup(name, sizeof(name));
+ DBG("Auto session name set to %s", session_name);
+ }
+
+ ret = lttng_create_session(session_name);
+ if (ret < 0) {
+ goto error;
+ }
+
+ MSG("Session created: %s", session_name);
+
+error:
+ return ret;
+}
+
+/*
+ * 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;
+ struct lttng_session *sessions;
+
+ count = lttng_list_sessions(&sessions);
+ DBG("Session count %d", count);
+ if (count < 0) {
+ ret = count;
+ goto error;
+ }
+
+ MSG("Available sessions (UUIDs):");
+ for (i = 0; i < count; i++) {
+ MSG(" %d) %s", i+1, sessions[i].name);
+ }
+
+ free(sessions);
+ 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)
+{
+ /* If listing options, jump validation */
+ if (opt_list_apps || opt_list_session) {
+ goto end;
+ }
+ /* Conflicting command */
+ if (opt_start_trace && opt_stop_trace) {
+ ERR("Can't use --start and --stop together.");
+ goto error;
+ /* If no PID specified and trace_kernel is off */
+ } else if ((opt_trace_pid == 0 && !opt_trace_kernel) &&
+ (opt_create_trace || opt_start_trace || opt_stop_trace || opt_destroy_trace)) {
+ ERR("Please specify for which tracer (-k or -p PID).");
+ goto error;
+ /* List traces, we need a session name */
+ } else if (opt_list_traces && opt_session_name == NULL) {
+ ERR("Can't use -t without -s, --session option.");
+ goto error;
+ /* Can't set event for both kernel and userspace at the same time */
+ } else if (opt_event_list != NULL && (opt_trace_kernel && opt_trace_pid)) {
+ ERR("Please don't use --event for both kernel and userspace.\nOne at a time to enable events.");
+ goto error;
+ /* Don't need a trace name for kernel tracig */
+ } else if (opt_trace_name != NULL && opt_trace_kernel) {
+ ERR("For action on a kernel trace, please don't specify a trace name.");
+ goto error;
+ } else if (opt_destroy_trace && opt_session_name == NULL) {
+ ERR("Please specify a session in order to destroy a trace");
+ goto error;
+ } else if (opt_create_trace || opt_destroy_trace) {
+ /* Both kernel and user-space are denied for these options */
+ if (opt_trace_pid != 0 && opt_trace_kernel) {
+ ERR("Kernel and user-space trace creation and destruction can't be used together.");
+ goto error;
+ /* Need a trace name for user-space tracing */
+ } else if (opt_trace_name == NULL && opt_trace_pid != 0) {
+ ERR("Please specify a trace name for user-space tracing");
+ goto error;
+ }
+ } else if (opt_stop_trace && opt_trace_pid != 0 && opt_trace_name == NULL) {
+ ERR("Please specify a trace name for user-space tracing");
+ goto error;
+ } else if (opt_stop_trace && opt_session_name == NULL) {
+ ERR("Please specify a session to stop tracing");
+ goto error;
+ }
+
+ /* If start trace, auto start tracing */
+ if (opt_start_trace || opt_event_list != NULL || opt_enable_all_event) {
+ DBG("Requesting auto tracing");
+ auto_trace = 1;
+ }
+
+ /* If no session, auto create one */
+ if (opt_session_name == NULL) {
+ DBG("Requesting an auto session creation");
+ auto_session = 1;
}
+end:
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.
+ */
+ execlp(pathname, "ltt-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 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, *alloc_pathname = NULL;
- ret = lttng_check_session_daemon();
- if (ret < 0) {
- ERR("No session daemon found. Aborting.");
+ 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, "ltt-sessiond");
+ if (ret < 0) {
+ 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;
}
+/*
+ * 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
void clean_exit(int code)
{
DBG("Clean exit");
+ if (session_name) {
+ free(session_name);
+ }
+
exit(code);
}
/*
- * 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