X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=liblttngctl%2Flttngctl.c;h=c91a242f32a246c9f021ac99ddb40f0c0ab66dde;hp=42f3ad2ae9950729c3c53922c759d53173d59ee5;hb=5117eeecf9d4b04ebe5a4e46b48c0d6186bb429b;hpb=2269e89ed1579f2d4fb0bc9a801af03c5c39fa52

diff --git a/liblttngctl/lttngctl.c b/liblttngctl/lttngctl.c
index 42f3ad2ae..c91a242f3 100644
--- a/liblttngctl/lttngctl.c
+++ b/liblttngctl/lttngctl.c
@@ -21,18 +21,17 @@
  */
 
 #define _GNU_SOURCE
-#include <errno.h>
 #include <grp.h>
+#include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 
-#include <lttng/lttng.h>
-
 #include <lttng-sessiond-comm.h>
-#include "lttngerr.h"
-#include "lttng-share.h"
+#include <lttng-share.h>
+#include <lttng/lttng.h>
+#include <lttngerr.h>
 
 /* Socket to session daemon for communication */
 static int sessiond_socket;
@@ -153,6 +152,10 @@ static int check_tracing_group(const char *grp_name)
 
 	/* Alloc group list of the right size */
 	grp_list = malloc(grp_list_size * sizeof(gid_t));
+	if (!grp_list) {
+		ret = -1;
+		goto end;
+	}
 	grp_id = getgroups(grp_list_size, grp_list);
 	if (grp_id < -1) {
 		perror("getgroups");
@@ -331,6 +334,10 @@ static int ask_sessiond(struct lttcomm_session_msg *lsm, void **buf)
 
 	size = llm.data_size;
 	if (size == 0) {
+		/* If client free with size 0 */
+		if (buf != NULL) {
+			*buf = NULL;
+		}
 		ret = 0;
 		goto end;
 	}
@@ -344,6 +351,16 @@ static int ask_sessiond(struct lttcomm_session_msg *lsm, void **buf)
 		goto end;
 	}
 
+	/*
+	 * Extra protection not to dereference a NULL pointer. If buf is NULL at
+	 * this point, an error is returned and data is freed.
+	 */
+	if (buf == NULL) {
+		ret = -1;
+		free(data);
+		goto end;
+	}
+
 	*buf = data;
 	ret = size;
 
@@ -479,10 +496,11 @@ int lttng_enable_event(struct lttng_handle *handle,
 {
 	struct lttcomm_session_msg lsm;
 
-	if (!handle) {
+	if (handle == NULL || ev == NULL) {
 		return -1;
 	}
 
+	/* If no channel name, we put the default name */
 	if (channel_name == NULL) {
 		copy_string(lsm.u.enable.channel_name, DEFAULT_CHANNEL_NAME,
 				sizeof(lsm.u.enable.channel_name));
@@ -493,12 +511,12 @@ int lttng_enable_event(struct lttng_handle *handle,
 
 	copy_lttng_domain(&lsm.domain, &handle->domain);
 
-	if (ev) {
+	if (ev->name[0] != '\0') {
 		lsm.cmd_type = LTTNG_ENABLE_EVENT;
-		memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event));
 	} else {
 		lsm.cmd_type = LTTNG_ENABLE_ALL_EVENT;
 	}
+	memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event));
 
 	copy_string(lsm.session.name, handle->session_name,
 			sizeof(lsm.session.name));
@@ -528,7 +546,7 @@ int lttng_disable_event(struct lttng_handle *handle, const char *name,
 
 	copy_lttng_domain(&lsm.domain, &handle->domain);
 
-	if (name == NULL) {
+	if (name != NULL) {
 		copy_string(lsm.u.disable.name, name, sizeof(lsm.u.disable.name));
 		lsm.cmd_type = LTTNG_DISABLE_EVENT;
 	} else {
@@ -549,13 +567,14 @@ int lttng_enable_channel(struct lttng_handle *handle,
 {
 	struct lttcomm_session_msg lsm;
 
-	if (!handle) {
+	/*
+	 * NULL arguments are forbidden. No default values.
+	 */
+	if (handle == NULL || chan == NULL) {
 		return -1;
 	}
 
-	if (chan) {
-		memcpy(&lsm.u.channel.chan, chan, sizeof(lsm.u.channel.chan));
-	}
+	memcpy(&lsm.u.channel.chan, chan, sizeof(lsm.u.channel.chan));
 
 	lsm.cmd_type = LTTNG_ENABLE_CHANNEL;
 
@@ -623,7 +642,7 @@ int lttng_list_tracepoints(struct lttng_handle *handle,
 /*
  *  Return a human readable string of code
  */
-const char *lttng_get_readable_code(int code)
+const char *lttng_strerror(int code)
 {
 	if (code > -LTTCOMM_OK) {
 		return "Ended with errors";
@@ -767,10 +786,8 @@ int lttng_list_events(struct lttng_handle *handle,
 }
 
 /*
- *  lttng_set_tracing_group
- *
- *  Set tracing group variable with name. This function
- *  allocate memory pointed by tracing_group.
+ * Set tracing group variable with name. This function allocate memory pointed
+ * by tracing_group.
  */
 int lttng_set_tracing_group(const char *name)
 {
@@ -801,6 +818,46 @@ int lttng_calibrate(struct lttng_handle *handle,
 	return ask_sessiond(&lsm, NULL);
 }
 
+/*
+ * Set default channel attributes.
+ */
+void lttng_channel_set_default_attr(struct lttng_domain *domain,
+		struct lttng_channel_attr *attr)
+{
+	/* Safety check */
+	if (attr == NULL || domain == NULL) {
+		return;
+	}
+
+	switch (domain->type) {
+	case LTTNG_DOMAIN_KERNEL:
+		attr->overwrite = DEFAULT_CHANNEL_OVERWRITE;
+		attr->switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
+		attr->read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
+
+		attr->subbuf_size = DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE;
+		attr->num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM;
+		attr->output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
+		break;
+	case LTTNG_DOMAIN_UST:
+	case LTTNG_DOMAIN_UST_EXEC_NAME:
+	case LTTNG_DOMAIN_UST_PID:
+	case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
+		attr->overwrite = DEFAULT_CHANNEL_OVERWRITE;
+		attr->switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
+		attr->read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
+
+		attr->subbuf_size = DEFAULT_UST_CHANNEL_SUBBUF_SIZE;
+		attr->num_subbuf = DEFAULT_UST_CHANNEL_SUBBUF_NUM;
+		attr->output = DEFAULT_UST_CHANNEL_OUTPUT;
+		break;
+	default:
+		/* Default behavior */
+		memset(attr, 0, sizeof(struct lttng_channel_attr));
+		break;
+	}
+}
+
 /*
  * Check if session daemon is alive.
  *