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qemu-nbd: handle dup2() error when qemu-nbd finished setup process 

Fail on error, we are in trouble.

Signed-off-by: Denis V. Lunev <den@openvz.org>
CC: Eric Blake <eblake@redhat.com>
CC: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Message-ID: <20230717145544.194786-6-den@openvz.org>
Reviewed-by: Eric Blake <eblake@redhat.com>
[eblake: avoid intermediate variable]
Signed-off-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Denis V. Lunev 2023-07-17 16:55:44 +02:00 committed by Eric Blake
parent e0892ced05
commit 173776f74d
1 changed files with 10 additions and 2 deletions
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12
qemu-nbd.c
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@ -323,7 +323,11 @@ static void *nbd_client_thread(void *arg)
opts->device, srcpath);
} else {
/* Close stderr so that the qemu-nbd process exits. */
dup2(STDOUT_FILENO, STDERR_FILENO);
if (dup2(STDOUT_FILENO, STDERR_FILENO) < 0) {
error_report("Could not set stderr to /dev/null: %s",
strerror(errno));
exit(EXIT_FAILURE);
}
}
if (nbd_client(fd) < 0) {
@ -1171,7 +1175,11 @@ int main(int argc, char **argv)
}
if (fork_process) {
dup2(STDOUT_FILENO, STDERR_FILENO);
if (dup2(STDOUT_FILENO, STDERR_FILENO) < 0) {
error_report("Could not set stderr to /dev/null: %s",
strerror(errno));
exit(EXIT_FAILURE);
}
}
state = RUNNING;