all: check return value from daemon() call

* */*main.c: (main) Current versions of Gcc warn if the return value for
  daemon() is not checked.  So add a simple test and exit on failure.

1 files changed, 5 insertions, 2 deletions

diff --git a/zebra/main.c b/zebra/main.c
index 2d6a4ac8..d829c046 100644
--- a/zebra/main.c
+++ b/zebra/main.c
@@ -362,8 +362,11 @@ main (int argc, char **argv)
     exit (0);
 
   /* Daemonize. */
-  if (daemon_mode)
-    daemon (0, 0);
+  if (daemon_mode && daemon (0, 0) < 0)
+    {
+      zlog_err("Zebra daemon failed: %s", strerror(errno));
+      exit (1);
+    }
 
   /* Output pid of zebra. */
   pid_output (pid_file);