os: Make sure that writing our pid to the lock file actually worked

There's no sense verifying that we can create the lock file and then
ignoring the return value from write.

Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Jamey Sharp <jamey@minilop.net>

diff --git a/os/utils.c b/os/utils.c
index 6e6974e..83d85cd 100644 (file)
--- a/os/utils.c
+++ b/os/utils.c
@@ -313,7 +313,8 @@ LockServer(void)
     if (lfd < 0)
         FatalError("Could not create lock file in %s\n", tmp);
     snprintf(pid_str, sizeof(pid_str), "%10ld\n", (long) getpid());
-    (void) write(lfd, pid_str, 11);
+    if (write(lfd, pid_str, 11) != 11)
+        FatalError("Could not write pid to lock file in %s\n", tmp);
     (void) fchmod(lfd, 0444);
     (void) close(lfd);