iov: handle EOF in iov_send_recv

Without this patch, iov_send_recv() never returns when do_send_recv()
returns zero.

Signed-off-by: MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit 840042901710c2dc1a3ac3e5af9bed449c339701)

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/util/iov.c b/util/iov.c
index cc6e837c83..f705586808 100644
--- a/util/iov.c
+++ b/util/iov.c
@@ -202,6 +202,12 @@ ssize_t iov_send_recv(int sockfd, struct iovec *iov, unsigned iov_cnt,
             return -1;
         }
 
+        if (ret == 0 && !do_send) {
+            /* recv returns 0 when the peer has performed an orderly
+             * shutdown. */
+            break;
+        }
+
         /* Prepare for the next iteration */
         offset += ret;
         total += ret;