[PATCH 71/78] qemu-nbd: Close inherited stderr

[Michael Roth]

From: Raphael Pour <raphael.pour@hetzner.com>

Close inherited stderr of the parent if fork_process is false.
Otherwise no one will close it. (introduced by e6df58a5)

This only affected 'qemu-nbd -c /dev/nbd0'.

Signed-off-by: Raphael Pour <raphael.pour@hetzner.com>
Message-Id: <d8ddc993-9816-836e-a3de-c6edab9d9c49@hetzner.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
[eblake: Enhance commit message]
Signed-off-by: Eric Blake <eblake@redhat.com>
(cherry picked from commit 0eaf453ebf6788885fbb5d40426b154ef8805407)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---
 qemu-nbd.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/qemu-nbd.c b/qemu-nbd.c
index 108a51f7eb..38031310af 100644
--- a/qemu-nbd.c
+++ b/qemu-nbd.c
@@ -1022,7 +1022,11 @@ int main(int argc, char **argv)
         } else if (pid == 0) {
             close(stderr_fd[0]);
 
-            old_stderr = dup(STDERR_FILENO);
+            /* Remember parent's stderr if we will be restoring it. */
+            if (fork_process) {
+                old_stderr = dup(STDERR_FILENO);
+            }
+
             ret = qemu_daemon(1, 0);
 
             /* Temporarily redirect stderr to the parent's pipe...  */
-- 
2.17.1