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qemu-nbd: changes towards enabling -Wshadow=local

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Address all compiler complaints from -Wshadow in qemu-nbd.  Several
instances of 'int ret' became shadows when commit 4fbec260 added 'ret'
at a higher scope in main.  More interesting was the 'void *ret'
capturing the result of a pthread; where we were conceptually doing
'(void*)(intptr_t)EXIT_FAILURE != NULL' which just feels wrong (even
though it happens to compile correctly), so it was worth a better
cleanup.

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-ID: <20230922205019.2755352-2-eblake@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
This commit is contained in:
Eric Blake 2023-09-22 15:50:20 -05:00 committed by Markus Armbruster
parent 0d57919acf
commit e161785c05
1 changed files with 4 additions and 5 deletions
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9
qemu-nbd.c
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@ -939,7 +939,6 @@ int main(int argc, char **argv)
g_autoptr(GError) err = NULL;
int stderr_fd[2];
pid_t pid;
int ret;
if (!g_unix_open_pipe(stderr_fd, FD_CLOEXEC, &err)) {
error_report("Error setting up communication pipe: %s",
@ -1172,7 +1171,6 @@ int main(int argc, char **argv)
if (opts.device) {
#if HAVE_NBD_DEVICE
int ret;
ret = pthread_create(&client_thread, NULL, nbd_client_thread, &opts);
if (ret != 0) {
error_report("Failed to create client thread: %s", strerror(ret));
@ -1219,9 +1217,10 @@ int main(int argc, char **argv)
qemu_opts_del(sn_opts);
if (opts.device) {
void *ret;
pthread_join(client_thread, &ret);
exit(ret != NULL);
void *result;
pthread_join(client_thread, &result);
ret = (intptr_t)result;
exit(ret);
} else {
exit(EXIT_SUCCESS);
}