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qemu-nbd: improve error message for dup2 error

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This error happens if we are not able to close the pipe to the
parent (to trace errors in the child process) and assign stderr to
/dev/null as required by the daemonizing convention.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Suggested-by: Eric Blake <eblake@redhat.com>
CC: Eric Blake <eblake@redhat.com>
CC: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Message-ID: <20230906093210.339585-2-den@openvz.org>
Reviewed-by: Eric Blake <eblake@redhat.com>
[eblake: commit message grammar]
Signed-off-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Denis V. Lunev 2023-09-06 11:32:03 +02:00 committed by Eric Blake
parent 522a9b94e0
commit b4bbdf51e3
1 changed files with 2 additions and 2 deletions
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4
qemu-nbd.c
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@ -324,7 +324,7 @@ static void *nbd_client_thread(void *arg)
} else {
/* Close stderr so that the qemu-nbd process exits. */
if (dup2(STDOUT_FILENO, STDERR_FILENO) < 0) {
error_report("Could not set stderr to /dev/null: %s",
error_report("Could not release pipe to parent: %s",
strerror(errno));
exit(EXIT_FAILURE);
}
@ -1181,7 +1181,7 @@ int main(int argc, char **argv)
if (fork_process) {
if (dup2(STDOUT_FILENO, STDERR_FILENO) < 0) {
error_report("Could not set stderr to /dev/null: %s",
error_report("Could not release pipe to parent: %s",
strerror(errno));
exit(EXIT_FAILURE);
}