* Lock citadel.control using flock() immediately after

[citadel.git] / citadel / sysdep.c

diff --git a/citadel/sysdep.c b/citadel/sysdep.c
index f4e20d72ebb3c6bda71acff9ecad6fce5d95f1e9..c992adbe6f6b57a51a89c7cca953a09a807f05ce 100644 (file)
--- a/citadel/sysdep.c
+++ b/citadel/sysdep.c
@@ -757,7 +757,22 @@ void kill_session(int session_to_kill) {
  * Start running as a daemon.
  */
 void start_daemon(int unused) {
-       close(0); close(1); close(2);
+       int nullfd;
+
+       /* Close stdin/stdout/stderr and replace them with /dev/null.
+        * We don't just call close() because we don't want these fd's
+        * to be reused for other files.
+        */
+       nullfd = open("/dev/null", O_RDWR);
+       if (nullfd < 0) {
+               fprintf(stderr, "/dev/null: %s\n", strerror(errno));
+               exit(2);
+       }
+       dup2(nullfd, 0);
+       dup2(nullfd, 1);
+       dup2(nullfd, 2);
+       close(nullfd);
+
        if (fork()) exit(0);
        setsid();
        signal(SIGHUP,SIG_IGN);