daemon: Suppress valgrind warnings from read_pidfile().

The version of valgrind I have in my test VMs doesn't know what F_GETLK
does, so it complains that l_pid is uninitialized even though fcntl sets
it.  Initializing it ourselves before calling the function avoids a series
of false-positive warnings about use of uninitialized data.

diff --git a/lib/daemon.c b/lib/daemon.c
index c0f1682..9db6c1f 100644 (file)
--- a/lib/daemon.c
+++ b/lib/daemon.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008, 2009, 2010 Nicira Networks.
+ * Copyright (c) 2008, 2009, 2010, 2011 Nicira Networks.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -536,6 +536,7 @@ read_pidfile(const char *pidfile)
     lck.l_whence = SEEK_SET;
     lck.l_start = 0;
     lck.l_len = 0;
+    lck.l_pid = 0;
     if (fcntl(fileno(file), F_GETLK, &lck)) {
         error = errno;
         VLOG_WARN("%s: fcntl: %s", pidfile, strerror(error));