appliance: Document pipe fds.

[libguestfs.git] / src / launch.c

diff --git a/src/launch.c b/src/launch.c
index 0af8ed5..58fb0d1 100644 (file)
--- a/src/launch.c
+++ b/src/launch.c
@@ -1,5 +1,5 @@
 /* libguestfs
- * Copyright (C) 2009-2010 Red Hat Inc.
+ * Copyright (C) 2009-2011 Red Hat Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -71,6 +71,7 @@
 #include "guestfs_protocol.h"
 
 static int launch_appliance (guestfs_h *g);
+static int64_t timeval_diff (const struct timeval *x, const struct timeval *y);
 static int qemu_supports (guestfs_h *g, const char *option);
 
 /* Add a string to the current command line. */
@@ -607,11 +608,13 @@ launch_appliance (guestfs_h *g)
       close (wfd[1]);
       close (rfd[0]);
 
+      /* Stdin. */
       if (dup (wfd[0]) == -1) {
       dup_failed:
         perror ("dup failed");
         _exit (EXIT_FAILURE);
       }
+      /* Stdout. */
       if (dup (rfd[1]) == -1)
         goto dup_failed;