[Xen-changelog] [xen-unstable] Fix for fs-backend crash when xend was not started after system boot.

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1266833181 0
# Node ID 243614f8360c3aac8d73cd59d1cbc2765bf4b53d
# Parent  628600e0e3b426a02602600645b2a74c9a1b4c6e
Fix for fs-backend crash when xend was not started after system boot.

Signed-off-by: Daniel Kiper <dkiper@xxxxxxxxxxxx>
---
 tools/fs-back/fs-backend.c |    3 ++-
 tools/fs-back/fs-xenbus.c  |    7 +++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff -r 628600e0e3b4 -r 243614f8360c tools/fs-back/fs-backend.c
--- a/tools/fs-back/fs-backend.c        Mon Feb 22 10:05:40 2010 +0000
+++ b/tools/fs-back/fs-backend.c        Mon Feb 22 10:06:21 2010 +0000
@@ -300,7 +300,8 @@ static void await_connections(void)
     LIST_INIT (&mount_requests_head);
 
     assert(xsh != NULL);
-    fd = xenbus_get_watch_fd(); 
+    if ((fd = xenbus_get_watch_fd()) == -1)
+           err(1, "xenbus_get_watch_fd: could not setup watch");
     /* Infinite watch loop */
     do {
        FD_ZERO(&fds);
diff -r 628600e0e3b4 -r 243614f8360c tools/fs-back/fs-xenbus.c
--- a/tools/fs-back/fs-xenbus.c Mon Feb 22 10:05:40 2010 +0000
+++ b/tools/fs-back/fs-xenbus.c Mon Feb 22 10:06:21 2010 +0000
@@ -105,11 +105,18 @@ int xenbus_get_watch_fd(void)
 int xenbus_get_watch_fd(void)
 {
     int res;
+#if DEBUG
+    int errno_orig;
+#endif
     assert(xsh != NULL);
     res = xs_watch(xsh, WATCH_NODE, "conn-watch");
     if (!res) {
+#if DEBUG
+       errno_orig = errno;
         FS_DEBUG("ERROR: xs_watch %s failed ret=%d errno=%d\n",
                  WATCH_NODE, res, errno);
+       errno = errno_orig;
+#endif
         return -1;
     }
     return xs_fileno(xsh); 

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