X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=ltt-sessiond%2Fmain.c;h=436ee9f167e8a45853fe9b58557555de74b82629;hp=85ac06be9e32c2967417513b7902d2b226b303ba;hb=733bb3da0f1ef5005ffe5df7811875e737cb3414;hpb=0fdd1e2c4a9f725daed3f91dd4f5609ae54ebe93

diff --git a/ltt-sessiond/main.c b/ltt-sessiond/main.c
index 85ac06be9..436ee9f16 100644
--- a/ltt-sessiond/main.c
+++ b/ltt-sessiond/main.c
@@ -880,6 +880,15 @@ static int update_apps_cmd_pollfd(unsigned int nb_fd, unsigned int old_nb_fd,
 		}
 	}
 
+	if (nb_fd < 2) {
+		/*
+		 * There should *always* be at least two fds in the pollfd. This safety
+		 * check make sure the poll() will actually try on those two pipes at
+		 * best which are the thread_quit_pipe and apps_cmd_pipe.
+		 */
+		nb_fd = 2;
+	}
+
 	/* Destroy old pollfd */
 	free(old_pollfd);
 
@@ -899,7 +908,7 @@ error:
  */
 static void *thread_manage_apps(void *data)
 {
-	int i, ret, count;
+	int i, ret, current_nb_fd;
 	unsigned int nb_fd = 2;
 	int update_poll_flag = 1;
 	struct pollfd *pollfd = NULL;
@@ -908,6 +917,7 @@ static void *thread_manage_apps(void *data)
 	DBG("[thread] Manage application started");
 
 	ust_cmd.sock = -1;
+	current_nb_fd = nb_fd;
 
 	while (1) {
 		/* See if we have a valid socket to add to pollfd */
@@ -918,7 +928,7 @@ static void *thread_manage_apps(void *data)
 
 		/* The pollfd struct must be updated */
 		if (update_poll_flag) {
-			ret = update_apps_cmd_pollfd(nb_fd, ARRAY_SIZE(pollfd), &pollfd);
+			ret = update_apps_cmd_pollfd(nb_fd, current_nb_fd, &pollfd);
 			if (ret < 0) {
 				/* malloc failed so we quit */
 				goto error;
@@ -978,8 +988,8 @@ static void *thread_manage_apps(void *data)
 			}
 		}
 
-		count = nb_fd;
-		for (i = 2; i < count; i++) {
+		current_nb_fd = nb_fd;
+		for (i = 2; i < current_nb_fd; i++) {
 			/* Apps socket is closed/hungup */
 			switch (pollfd[i].revents) {
 			case POLLERR:
@@ -994,7 +1004,7 @@ static void *thread_manage_apps(void *data)
 			}
 		}
 
-		if (nb_fd != count) {
+		if (nb_fd != current_nb_fd) {
 			update_poll_flag = 1;
 		}
 	}