/*
+ * liblttngctl.c
+ *
+ * Linux Trace Toolkit Control Library
+ *
* 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 the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; only
+ * version 2.1 of the License.
+ *
+ * This library 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#define _GNU_SOURCE
#include <lttng/lttng.h>
-#include "liblttsessiondcomm.h"
+#include <lttng/lttng-sessiond-comm.h>
#include "lttngerr.h"
#include "lttng-share.h"
static char *tracing_group;
static int connected;
+/*
+ * Copy string from src to dst and enforce null terminated byte.
+ */
+static void copy_string(char *dst, const char *src, size_t len)
+{
+ if (src && dst) {
+ strncpy(dst, src, len);
+ /* Enforce the NULL terminated byte */
+ dst[len - 1] = '\0';
+ }
+}
+
/*
* send_data_sessiond
*
}
/*
- * ask_sessiond
- *
- * Ask the session daemon a specific command and put the data into buf.
- *
- * Return size of data (only payload, not header).
- */
-static int ask_sessiond(enum lttcomm_sessiond_command lct, void **buf)
-{
- int ret;
- size_t size;
- void *data = NULL;
-
- ret = lttng_connect_sessiond();
- if (ret < 0) {
- goto end;
- }
-
- lsm.cmd_type = lct;
-
- /* Send command to session daemon */
- ret = send_data_sessiond();
- if (ret < 0) {
- goto end;
- }
-
- /* Get header from data transmission */
- ret = recv_data_sessiond(&llm, sizeof(llm));
- if (ret < 0) {
- goto end;
- }
-
- /* Check error code if OK */
- if (llm.ret_code != LTTCOMM_OK) {
- ret = -llm.ret_code;
- goto end;
- }
-
- size = llm.data_size;
- if (size == 0) {
- goto end;
- }
-
- data = (void*) malloc(size);
-
- /* Get payload data */
- ret = recv_data_sessiond(data, size);
- if (ret < 0) {
- free(data);
- goto end;
- }
-
- *buf = data;
- ret = size;
-
-end:
- lttng_disconnect_sessiond();
- return ret;
-}
-
-/*
- * check_tracing_group
- *
* Check if the specified group name exist.
- * If yes, 0, else -1
+ *
+ * If yes return 0, else return -1.
*/
static int check_tracing_group(const char *grp_name)
{
}
/*
- * set_session_daemon_path
- *
- * Set sessiond socket path by putting it in
- * the global sessiond_sock_path variable.
+ * Set sessiond socket path by putting it in the global sessiond_sock_path
+ * variable.
*/
static int set_session_daemon_path(void)
{
/* Are we in the tracing group ? */
ret = check_tracing_group(tracing_group);
if (ret < 0 && getuid() != 0) {
- if (sprintf(sessiond_sock_path, DEFAULT_HOME_CLIENT_UNIX_SOCK,
- getenv("HOME")) < 0) {
+ if (snprintf(sessiond_sock_path, PATH_MAX,
+ DEFAULT_HOME_CLIENT_UNIX_SOCK,
+ getenv("HOME")) < 0) {
return -ENOMEM;
}
} else {
- strncpy(sessiond_sock_path, DEFAULT_GLOBAL_CLIENT_UNIX_SOCK,
- sizeof(DEFAULT_GLOBAL_CLIENT_UNIX_SOCK));
+ copy_string(sessiond_sock_path, DEFAULT_GLOBAL_CLIENT_UNIX_SOCK,
+ PATH_MAX);
}
return 0;
}
/*
- * lttng_start_tracing
+ * Connect to the LTTng session daemon.
*
- * Start tracing for all trace of the session.
+ * On success, return 0. On error, return -1.
*/
-int lttng_start_tracing(char *session_name)
+static int connect_sessiond(void)
{
- strncpy(lsm.session_name, session_name, NAME_MAX);
- return ask_sessiond(LTTNG_START_TRACE, NULL);
+ int ret;
+
+ ret = set_session_daemon_path();
+ if (ret < 0) {
+ return ret;
+ }
+
+ /* Connect to the sesssion daemon */
+ ret = lttcomm_connect_unix_sock(sessiond_sock_path);
+ if (ret < 0) {
+ return ret;
+ }
+
+ sessiond_socket = ret;
+ connected = 1;
+
+ return 0;
}
/*
- * lttng_stop_tracing
- *
- * Stop tracing for all trace of the session.
+ * Clean disconnect the session daemon.
*/
-int lttng_stop_tracing(char *session_name)
+static int disconnect_sessiond(void)
{
- strncpy(lsm.session_name, session_name, NAME_MAX);
- return ask_sessiond(LTTNG_STOP_TRACE, NULL);
+ int ret = 0;
+
+ if (connected) {
+ ret = lttcomm_close_unix_sock(sessiond_socket);
+ sessiond_socket = 0;
+ connected = 0;
+ }
+
+ return ret;
}
/*
- * BEGIN Kernel control API
+ * Reset the session message structure.
*/
+static void reset_session_msg(void)
+{
+ memset(&lsm, 0, sizeof(struct lttcomm_session_msg));
+}
/*
- * lttng_kernel_add_context
+ * ask_sessiond
+ *
+ * Ask the session daemon a specific command and put the data into buf.
+ *
+ * Return size of data (only payload, not header).
*/
-int lttng_kernel_add_context(struct lttng_kernel_context *ctx,
- char *event_name, char *channel_name)
+static int ask_sessiond(enum lttcomm_sessiond_command lct, void **buf)
{
- if (strlen(channel_name) != 0) {
- strncpy(lsm.u.context.channel_name, channel_name, NAME_MAX);
+ int ret;
+ size_t size;
+ void *data = NULL;
+
+ ret = connect_sessiond();
+ if (ret < 0) {
+ goto end;
}
- if (strlen(event_name) != 0) {
- strncpy(lsm.u.context.event_name, event_name, NAME_MAX);
+ lsm.cmd_type = lct;
+
+ /* Send command to session daemon */
+ ret = send_data_sessiond();
+ if (ret < 0) {
+ goto end;
}
- memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_kernel_context));
- return ask_sessiond(LTTNG_KERNEL_ADD_CONTEXT, NULL);
-}
+ /* Get header from data transmission */
+ ret = recv_data_sessiond(&llm, sizeof(llm));
+ if (ret < 0) {
+ goto end;
+ }
-/*
- * lttng_kernel_enable_event
- */
-int lttng_kernel_enable_event(struct lttng_event *ev, char *channel_name)
-{
- int ret;
+ /* Check error code if OK */
+ if (llm.ret_code != LTTCOMM_OK) {
+ ret = -llm.ret_code;
+ goto end;
+ }
- if (strlen(channel_name) == 0) {
- strncpy(lsm.u.enable.channel_name, DEFAULT_CHANNEL_NAME, NAME_MAX);
- } else {
- strncpy(lsm.u.enable.channel_name, channel_name, NAME_MAX);
+ size = llm.data_size;
+ if (size == 0) {
+ ret = 0;
+ goto end;
}
- if (ev == NULL) {
- ret = ask_sessiond(LTTNG_KERNEL_ENABLE_ALL_EVENT, NULL);
- } else {
- memcpy(&lsm.u.enable.event, ev, sizeof(struct lttng_event));
- ret = ask_sessiond(LTTNG_KERNEL_ENABLE_EVENT, NULL);
+ data = (void*) malloc(size);
+
+ /* Get payload data */
+ ret = recv_data_sessiond(data, size);
+ if (ret < 0) {
+ free(data);
+ goto end;
}
+ *buf = data;
+ ret = size;
+
+end:
+ disconnect_sessiond();
+ reset_session_msg();
return ret;
}
/*
- * lttng_kernel_disable_event
- *
- * Disable an event in the kernel tracer.
+ * Copy domain to lttcomm_session_msg domain. If unknown domain, default domain
+ * will be the kernel.
*/
-int lttng_kernel_disable_event(char *name, char *channel_name)
+static void copy_lttng_domain(struct lttng_domain *dom)
{
- int ret;
-
- if (strlen(channel_name) == 0) {
- strncpy(lsm.u.disable.channel_name, DEFAULT_CHANNEL_NAME, NAME_MAX);
- } else {
- strncpy(lsm.u.disable.channel_name, channel_name, NAME_MAX);
- }
-
- if (name == NULL) {
- ret = ask_sessiond(LTTNG_KERNEL_DISABLE_ALL_EVENT, NULL);
- } else {
- strncpy(lsm.u.disable.name, name, NAME_MAX);
- ret = ask_sessiond(LTTNG_KERNEL_DISABLE_EVENT, NULL);
+ if (dom) {
+ switch (dom->type) {
+ case LTTNG_DOMAIN_KERNEL:
+ case LTTNG_DOMAIN_UST:
+ case LTTNG_DOMAIN_UST_EXEC_NAME:
+ case LTTNG_DOMAIN_UST_PID:
+ case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
+ memcpy(&lsm.domain, dom, sizeof(struct lttng_domain));
+ break;
+ default:
+ lsm.domain.type = LTTNG_DOMAIN_KERNEL;
+ break;
+ }
}
-
- return ret;
}
/*
- * lttng_kernel_enable_channel
- *
- * Enable recording for a channel for the kernel tracer.
+ * Start tracing for all trace of the session.
*/
-int lttng_kernel_enable_channel(char *name)
+int lttng_start_tracing(const char *session_name)
{
- strncpy(lsm.u.enable.channel_name, name, NAME_MAX);
- return ask_sessiond(LTTNG_KERNEL_ENABLE_CHANNEL, NULL);
+ copy_string(lsm.session.name, session_name, NAME_MAX);
+ return ask_sessiond(LTTNG_START_TRACE, NULL);
}
/*
- * lttng_kernel_disable_channel
- *
- * Disable recording for the channel for the kernel tracer.
+ * Stop tracing for all trace of the session.
*/
-int lttng_kernel_disable_channel(char *name)
+int lttng_stop_tracing(const char *session_name)
{
- strncpy(lsm.u.disable.channel_name, name, NAME_MAX);
- return ask_sessiond(LTTNG_KERNEL_DISABLE_CHANNEL, NULL);
+ copy_string(lsm.session.name, session_name, NAME_MAX);
+ return ask_sessiond(LTTNG_STOP_TRACE, NULL);
}
/*
- * lttng_kernel_create_channel
- *
- * Create a channel in the kernel tracer.
+ * lttng_add_context
*/
-int lttng_kernel_create_channel(struct lttng_channel *chan)
+int lttng_add_context(struct lttng_domain *domain,
+ struct lttng_event_context *ctx, const char *event_name,
+ const char *channel_name)
{
- memcpy(&lsm.u.channel.chan, chan, sizeof(struct lttng_channel));
- return ask_sessiond(LTTNG_KERNEL_CREATE_CHANNEL, NULL);
+ copy_string(lsm.u.context.channel_name, channel_name, NAME_MAX);
+ copy_string(lsm.u.context.event_name, event_name, NAME_MAX);
+ copy_lttng_domain(domain);
+
+ if (ctx) {
+ memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context));
+ }
+
+ return ask_sessiond(LTTNG_ADD_CONTEXT, NULL);
}
/*
- * lttng_list_events
- *
- * List all available events in the kernel.
- *
- * Return the size (bytes) of the list and set the event_list array.
- * On error, return negative value.
+ * lttng_enable_event
*/
-int lttng_kernel_list_events(char **event_list)
+int lttng_enable_event(struct lttng_domain *domain,
+ struct lttng_event *ev, const char *channel_name)
{
- return ask_sessiond(LTTNG_KERNEL_LIST_EVENTS, (void **) event_list);
+ int ret;
+
+ if (channel_name == NULL) {
+ copy_string(lsm.u.enable.channel_name, DEFAULT_CHANNEL_NAME, NAME_MAX);
+ } else {
+ copy_string(lsm.u.enable.channel_name, channel_name, NAME_MAX);
+ }
+
+ copy_lttng_domain(domain);
+
+ if (ev == NULL) {
+ ret = ask_sessiond(LTTNG_ENABLE_ALL_EVENT, NULL);
+ } else {
+ memcpy(&lsm.u.enable.event, ev, sizeof(struct lttng_event));
+ ret = ask_sessiond(LTTNG_ENABLE_EVENT, NULL);
+ }
+
+ return ret;
}
/*
- * END Kernel control API
+ * Disable event of a channel and domain.
*/
+int lttng_disable_event(struct lttng_domain *domain, const char *name,
+ const char *channel_name)
+{
+ int ret = -1;
+
+ if (channel_name == NULL) {
+ copy_string(lsm.u.disable.channel_name, DEFAULT_CHANNEL_NAME, NAME_MAX);
+ } else {
+ copy_string(lsm.u.disable.channel_name, channel_name, NAME_MAX);
+ }
+
+ copy_lttng_domain(domain);
+
+ if (name == NULL) {
+ ret = ask_sessiond(LTTNG_DISABLE_ALL_EVENT, NULL);
+ } else {
+ copy_string(lsm.u.disable.name, name, NAME_MAX);
+ ret = ask_sessiond(LTTNG_DISABLE_EVENT, NULL);
+ }
+
+ return ret;
+}
/*
- * lttng_get_readable_code
- *
- * Return a human readable string of code
+ * Enable channel per domain
*/
-const char *lttng_get_readable_code(int code)
+int lttng_enable_channel(struct lttng_domain *domain,
+ struct lttng_channel *chan)
{
- if (code > -LTTCOMM_OK) {
- return "Ended with errors";
+ if (chan) {
+ memcpy(&lsm.u.channel.chan, chan, sizeof(struct lttng_channel));
}
- return lttcomm_get_readable_code(code);
+ copy_lttng_domain(domain);
+
+ return ask_sessiond(LTTNG_ENABLE_CHANNEL, NULL);
}
/*
- * lttng_ust_list_apps
- *
- * Ask the session daemon for all UST traceable applications.
- *
- * Return the number of pids.
- * On error, return negative value.
+ * All tracing will be stopped for registered events of the channel.
*/
-int lttng_ust_list_traceable_apps(pid_t **pids)
+int lttng_disable_channel(struct lttng_domain *domain, const char *name)
{
- int ret;
+ copy_string(lsm.u.disable.channel_name, name, NAME_MAX);
+ copy_lttng_domain(domain);
- ret = ask_sessiond(LTTNG_LIST_TRACEABLE_APPS, (void**) pids);
- if (ret < 0) {
- return ret;
- }
-
- return ret / sizeof(pid_t);
+ return ask_sessiond(LTTNG_DISABLE_CHANNEL, NULL);
}
/*
- * lttng_list_traces
- *
- * Ask the session daemon for all traces (kernel and ust) for the session
- * identified by name.
+ * List all available tracepoints of domain.
*
- * Return the number of traces.
- * On error, return negative value.
+ * Return the size (bytes) of the list and set the events array.
+ * On error, return negative value.
*/
-/*
-int lttng_list_traces(char *session_name, struct lttng_trace **traces)
+int lttng_list_tracepoints(struct lttng_domain *domain,
+ struct lttng_event **events)
{
int ret;
- strncpy(lsm.session_name, session_name, NAME_MAX);
+ copy_lttng_domain(domain);
- ret = ask_sessiond(LTTNG_LIST_TRACES, (void **) traces);
+ ret = ask_sessiond(LTTNG_LIST_TRACEPOINTS, (void **) events);
if (ret < 0) {
return ret;
}
- return ret / sizeof(struct lttng_trace);
+ return ret / sizeof(struct lttng_event);
+}
+
+/*
+ * Return a human readable string of code
+ */
+const char *lttng_get_readable_code(int code)
+{
+ if (code > -LTTCOMM_OK) {
+ return "Ended with errors";
+ }
+
+ return lttcomm_get_readable_code(code);
}
-*/
/*
- * lttng_create_session
- *
* Create a brand new session using name.
*/
-int lttng_create_session(char *name, char *path)
+int lttng_create_session(const char *name, const char *path)
{
- strncpy(lsm.session_name, name, NAME_MAX);
- strncpy(lsm.path, path, PATH_MAX);
+ copy_string(lsm.session.name, name, NAME_MAX);
+ copy_string(lsm.session.path, path, PATH_MAX);
return ask_sessiond(LTTNG_CREATE_SESSION, NULL);
}
/*
- * lttng_destroy_session
- *
* Destroy session using name.
*/
-int lttng_destroy_session(char *name)
+int lttng_destroy_session(const char *name)
{
- strncpy(lsm.session_name, name, NAME_MAX);
+ copy_string(lsm.session.name, name, NAME_MAX);
return ask_sessiond(LTTNG_DESTROY_SESSION, NULL);
}
/*
- * lttng_list_sessions
- *
* Ask the session daemon for all available sessions.
*
* Return number of session.
}
/*
- * lttng_connect_sessiond
- *
- * Connect to the LTTng session daemon.
- * On success, return 0
- * On error, return a negative value
+ * List domain of a session.
*/
-int lttng_connect_sessiond(void)
+int lttng_list_domains(const char *session_name, struct lttng_domain **domains)
{
int ret;
- ret = set_session_daemon_path();
+ copy_string(lsm.session.name, session_name, NAME_MAX);
+ ret = ask_sessiond(LTTNG_LIST_DOMAINS, (void**) domains);
if (ret < 0) {
return ret;
}
- /* Connect to the sesssion daemon */
- ret = lttcomm_connect_unix_sock(sessiond_sock_path);
+ return ret / sizeof(struct lttng_domain);
+}
+
+/*
+ * List channels of a session
+ */
+int lttng_list_channels(struct lttng_domain *domain,
+ const char *session_name, struct lttng_channel **channels)
+{
+ int ret;
+
+ copy_string(lsm.session.name, session_name, NAME_MAX);
+ copy_lttng_domain(domain);
+
+ ret = ask_sessiond(LTTNG_LIST_CHANNELS, (void**) channels);
if (ret < 0) {
return ret;
}
- sessiond_socket = ret;
- connected = 1;
-
- return 0;
+ return ret / sizeof(struct lttng_channel);
}
/*
- * lttng_disconnect_sessiond
- *
- * Clean disconnect the session daemon.
+ * List events of a session channel.
*/
-int lttng_disconnect_sessiond(void)
+int lttng_list_events(struct lttng_domain *domain,
+ const char *session_name, const char *channel_name,
+ struct lttng_event **events)
{
- int ret = 0;
+ int ret;
- if (connected) {
- ret = lttcomm_close_unix_sock(sessiond_socket);
- sessiond_socket = 0;
- connected = 0;
+ copy_string(lsm.session.name, session_name, NAME_MAX);
+ copy_string(lsm.u.list.channel_name, channel_name, NAME_MAX);
+ copy_lttng_domain(domain);
+
+ ret = ask_sessiond(LTTNG_LIST_EVENTS, (void**) events);
+ if (ret < 0) {
+ return ret;
}
- return ret;
+ return ret / sizeof(struct lttng_event);
}
-void lttng_set_session_name(char *name)
+/*
+ * Set session name for the current lsm.
+ */
+void lttng_set_session_name(const char *name)
{
- strncpy(lsm.session_name, name, NAME_MAX);
+ copy_string(lsm.session.name, name, NAME_MAX);
}
/*
return 0;
}
+/*
+ * lttng_calibrate
+ */
+int lttng_calibrate(struct lttng_domain *domain,
+ struct lttng_calibrate *calibrate)
+{
+ int ret;
+
+ copy_lttng_domain(domain);
+
+ memcpy(&lsm.u.calibrate, calibrate, sizeof(struct lttng_calibrate));
+ ret = ask_sessiond(LTTNG_CALIBRATE, NULL);
+
+ return ret;
+}
+
/*
* lttng_check_session_daemon
*
return ret;
}
- /* If socket exist, we consider the daemon started */
+ /* If socket exist, we check if the daemon listens to connect. */
ret = access(sessiond_sock_path, F_OK);
if (ret < 0) {
/* Not alive */
return 0;
}
+ ret = lttcomm_connect_unix_sock(sessiond_sock_path);
+ if (ret < 0) {
+ /* Not alive */
+ return 0;
+ }
+ ret = lttcomm_close_unix_sock(ret);
+ if (ret < 0)
+ perror("lttcomm_close_unix_sock");
+
/* Is alive */
return 1;
}
projects / lttng-tools.git / blobdiff