X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=ltt-sessiond%2Fkernel-ctl.c;h=e486fa10ada0002e8e2f7437ce677a0f24475ba6;hp=3014620babe5ff4cea11ce1253eed43fa85d9862;hb=5f822d0a2688bb0b085b579dfc37a1958fff072e;hpb=f9815039b2c793170f6c411b3949aaa76d5b9141

diff --git a/ltt-sessiond/kernel-ctl.c b/ltt-sessiond/kernel-ctl.c
index 3014620ba..e486fa10a 100644
--- a/ltt-sessiond/kernel-ctl.c
+++ b/ltt-sessiond/kernel-ctl.c
@@ -194,10 +194,19 @@ int kernel_create_event(struct lttng_event *ev,
 
 	ret = kernctl_create_event(channel->fd, event->event);
 	if (ret < 0) {
-		perror("create event ioctl");
+		PERROR("create event ioctl");
 		goto free_event;
 	}
 
+	/*
+	 * LTTNG_KERNEL_SYSCALL event creation will return 0 on success. However
+	 * this FD must not be added to the event list.
+	 */
+	if (ret == 0 && event->event->instrumentation == LTTNG_KERNEL_SYSCALL) {
+		DBG2("Kernel event syscall creation success");
+		goto end;
+	}
+
 	event->fd = ret;
 	/* Prevent fd duplication after execlp() */
 	ret = fcntl(event->fd, F_SETFD, FD_CLOEXEC);
@@ -211,6 +220,7 @@ int kernel_create_event(struct lttng_event *ev,
 
 	DBG("Event %s created (fd: %d)", ev->name, event->fd);
 
+end:
 	return 0;
 
 free_event:
@@ -250,9 +260,8 @@ int kernel_enable_channel(struct ltt_kernel_channel *chan)
 	int ret;
 
 	ret = kernctl_enable(chan->fd);
-	if (ret < 0) {
-		perror("enable chan ioctl");
-		ret = errno;
+	if (ret < 0 && errno != EEXIST) {
+		perror("Enable kernel chan");
 		goto error;
 	}
 
@@ -273,11 +282,8 @@ int kernel_enable_event(struct ltt_kernel_event *event)
 	int ret;
 
 	ret = kernctl_enable(event->fd);
-	if (ret < 0) {
-		perror("enable event ioctl");
-		if (errno == EEXIST) {
-			ret = -EEXIST;
-		}
+	if (ret < 0 && errno != EEXIST) {
+		perror("enable kernel event");
 		goto error;
 	}
 
@@ -298,8 +304,8 @@ int kernel_disable_event(struct ltt_kernel_event *event)
 	int ret;
 
 	ret = kernctl_disable(event->fd);
-	if (ret < 0) {
-		perror("disable event ioctl");
+	if (ret < 0 && errno != EEXIST) {
+		perror("disable kernel event");
 		goto error;
 	}