Update quickstart

[lttng-tools.git] / liblttngctl / liblttngctl.c

diff --git a/liblttngctl/liblttngctl.c b/liblttngctl/liblttngctl.c
index 38c9945b9e8ab25191b4523b4aa8db9c718cf635..e0a81588281b1f1e82955627abe7eb22c7300331 100644 (file)
--- a/liblttngctl/liblttngctl.c
+++ b/liblttngctl/liblttngctl.c
@@ -1,19 +1,23 @@
 /*
+ * 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
@@ -204,6 +208,14 @@ static int disconnect_sessiond(void)
        return ret;
 }
 
+/*
+ * Reset the session message structure.
+ */
+static void reset_session_msg(void)
+{
+       memset(&lsm, 0, sizeof(struct lttcomm_session_msg));
+}
+
 /*
  *  ask_sessiond
  *
@@ -262,13 +274,14 @@ static int ask_sessiond(enum lttcomm_sessiond_command lct, void **buf)
 
 end:
        disconnect_sessiond();
+       reset_session_msg();
        return ret;
 }
 
 /*
  *  Start tracing for all trace of the session.
  */
-int lttng_start_tracing(char *session_name)
+int lttng_start_tracing(const char *session_name)
 {
        strncpy(lsm.session_name, session_name, NAME_MAX);
        return ask_sessiond(LTTNG_START_TRACE, NULL);
@@ -277,7 +290,7 @@ int lttng_start_tracing(char *session_name)
 /*
  *  Stop tracing for all trace of the session.
  */
-int lttng_stop_tracing(char *session_name)
+int lttng_stop_tracing(const char *session_name)
 {
        strncpy(lsm.session_name, session_name, NAME_MAX);
        return ask_sessiond(LTTNG_STOP_TRACE, NULL);
@@ -287,8 +300,8 @@ int lttng_stop_tracing(char *session_name)
  *  lttng_add_context
  */
 int lttng_add_context(struct lttng_domain *domain,
-               struct lttng_event_context *ctx, char *event_name, char *channel_name)
-
+               struct lttng_event_context *ctx, const char *event_name,
+               const char *channel_name)
 {
        int ret;
 
@@ -321,7 +334,7 @@ int lttng_add_context(struct lttng_domain *domain,
  *  lttng_enable_event
  */
 int lttng_enable_event(struct lttng_domain *domain,
-               struct lttng_event *ev, char *channel_name)
+               struct lttng_event *ev, const char *channel_name)
 {
        int ret;
 
@@ -354,8 +367,8 @@ int lttng_enable_event(struct lttng_domain *domain,
 /*
  * Disable an event in the kernel tracer.
  */
-int lttng_disable_event(struct lttng_domain *domain, char *name,
-               char *channel_name)
+int lttng_disable_event(struct lttng_domain *domain, const char *name,
+               const char *channel_name)
 {
        int ret;
 
@@ -388,7 +401,8 @@ int lttng_disable_event(struct lttng_domain *domain, char *name,
 /*
  * Enable recording for a channel for the kernel tracer.
  */
-int lttng_enable_channel(struct lttng_domain *domain, struct lttng_channel *chan)
+int lttng_enable_channel(struct lttng_domain *domain,
+               struct lttng_channel *chan)
 {
        int ret;
 
@@ -412,7 +426,7 @@ int lttng_enable_channel(struct lttng_domain *domain, struct lttng_channel *chan
 /*
  * Disable recording for the channel for the kernel tracer.
  */
-int lttng_disable_channel(struct lttng_domain *domain, char *name)
+int lttng_disable_channel(struct lttng_domain *domain, const char *name)
 {
        int ret;
 
@@ -473,7 +487,7 @@ const char *lttng_get_readable_code(int code)
 /*
  *  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);
@@ -483,7 +497,7 @@ int lttng_create_session(char *name, char *path)
 /*
  *  Destroy session using name.
  */
-int lttng_destroy_session(char *name)
+int lttng_destroy_session(const char *name)
 {
        strncpy(lsm.session_name, name, NAME_MAX);
        return ask_sessiond(LTTNG_DESTROY_SESSION, NULL);
@@ -510,7 +524,7 @@ int lttng_list_sessions(struct lttng_session **sessions)
 /*
  * Set session name for the current lsm.
  */
-void lttng_set_session_name(char *name)
+void lttng_set_session_name(const char *name)
 {
        strncpy(lsm.session_name, name, NAME_MAX);
 }