[Libguestfs] [PATCH libguestfs] daemon: diagnose socket write failure

[Jim Meyering]

On principle, we shouldn't ignore write failure:

>From 56317a61bc22e935dc750cf669a164bacc12cf12 Mon Sep 17 00:00:00 2001
From: Jim Meyering <meyering at redhat.com>
Date: Thu, 20 Aug 2009 12:29:46 +0200
Subject: [PATCH libguestfs] daemon: diagnose socket write failure

* daemon/proto.c (send_chunk): Don't ignore socket-write error.
---
 daemon/proto.c |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/daemon/proto.c b/daemon/proto.c
index 9b33902..c2dd50c 100644
--- a/daemon/proto.c
+++ b/daemon/proto.c
@@ -495,8 +495,10 @@ send_chunk (const guestfs_chunk *chunk)
   xdr_uint32_t (&xdr, &len);
   xdr_destroy (&xdr);

-  (void) xwrite (sock, lenbuf, 4);
-  (void) xwrite (sock, buf, len);
+  int err = (xwrite (sock, lenbuf, 4) == 0
+             && xwrite (sock, buf, len) == 0 ? 0 : -1);
+  if (err)
+    fprintf (stderr, "send_chunk: write failed\n");

-  return 0;
+  return err;
 }
--
1.6.4.378.g88f2f