[Qemu-devel] [PATCH 1/7] nbd: treat EPIPE from NBD_DO_IT as success

[Paolo Bonzini]

This can be seen with "qemu-nbd -v -c", which returns 1 instead of 0
when you disconnect with "qemu-nbd -d".

Signed-off-by: Paolo Bonzini <address@hidden>
---
        I think this is a bug (because there would be no way to exit
        qemu-nbd with zero status!), but the patch can be left out safely.

 nbd.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/nbd.c b/nbd.c
index fb5e424..e6c931c 100644
--- a/nbd.c
+++ b/nbd.c
@@ -425,6 +425,13 @@ int nbd_client(int fd)
     TRACE("Doing NBD loop");
 
     ret = ioctl(fd, NBD_DO_IT);
+    if (ret == -1 && errno == EPIPE) {
+        /* NBD_DO_IT normally returns EPIPE when someone has disconnected
+         * the socket via NBD_DISCONNECT.  We do not want to return 1 in
+         * that case.
+         */
+        ret = 0;
+    }
     serrno = errno;
 
     TRACE("NBD loop returned %d: %s", ret, strerror(serrno));
-- 
1.7.6.4