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/* NBD client library in userspace
* Copyright Red Hat
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* Deliberately disconnect while stranding commands, to check their status.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <signal.h>
#include <libnbd.h>
static bool trim_retired;
static const char *progname;
static int
callback (void *ignored, int *error)
{
if (*error != ENOTCONN) {
fprintf (stderr, "%s: unexpected error in trim callback: %s\n",
progname, strerror (*error));
return 0;
}
trim_retired = 1;
return 1;
}
int
main (int argc, char *argv[])
{
struct nbd_handle *nbd;
int err;
const char *msg;
char buf[512];
int64_t cookie;
int r;
const char *cmd[] = { NBDKIT, "-s", "--exit-with-parent",
"--filter=delay", "memory", "size=1m",
"delay-read=15", "delay-trim=15", NULL };
progname = argv[0];
nbd = nbd_create ();
if (nbd == NULL) {
fprintf (stderr, "%s: %s\n", argv[0], nbd_get_error ());
exit (EXIT_FAILURE);
}
/* Connect to a slow server. */
if (nbd_connect_command (nbd, (char **)cmd) == -1) {
fprintf (stderr, "%s: %s\n", argv[0], nbd_get_error ());
exit (EXIT_FAILURE);
}
/* Issue a read and trim that should not complete yet. Set up the
* trim to auto-retire via callback.
*/
if ((cookie = nbd_aio_pread (nbd, buf, sizeof buf, 0,
NBD_NULL_COMPLETION, 0)) == -1) {
fprintf (stderr, "%s: test failed: nbd_aio_pread: %s\n", argv[0],
nbd_get_error ());
exit (EXIT_FAILURE);
}
if (nbd_aio_trim (nbd, sizeof buf, 0,
(nbd_completion_callback) { .callback = callback },
0) == -1) {
fprintf (stderr, "%s: test failed: nbd_aio_trim: %s\n", argv[0],
nbd_get_error ());
exit (EXIT_FAILURE);
}
if (nbd_aio_peek_command_completed (nbd) != 0) {
fprintf (stderr, "%s: test failed: nbd_aio_peek_command_completed\n",
argv[0]);
exit (EXIT_FAILURE);
}
if (nbd_aio_command_completed (nbd, cookie) != 0) {
fprintf (stderr, "%s: test failed: nbd_aio_command_completed\n", argv[0]);
exit (EXIT_FAILURE);
}
/* Kill the server forcefully (SIGINT is not always strong enough,
* as nbdkit waits for pending transactions to finish before
* actually exiting), although it's a race whether our signal
* arrives while nbdkit has a pending transaction.
*/
if (nbd_kill_subprocess (nbd, SIGKILL) == -1) {
fprintf (stderr, "%s: test failed: nbd_kill_subprocess: %s\n", argv[0],
nbd_get_error ());
exit (EXIT_FAILURE);
}
/* This part is somewhat racy depending on how fast we run before
* the server process exits - depending on load and timing, nbd_poll
* may succeed or fail, and we may transition to either CLOSED (the
* state machine saw a clean EOF) or DEAD (the state machine saw a
* stranded transaction or POLLERR).
*/
while ((r = nbd_poll (nbd, 1000)) == 1)
if (nbd_aio_is_dead (nbd) || nbd_aio_is_closed (nbd))
break;
if (!(nbd_aio_is_dead (nbd) || nbd_aio_is_closed (nbd))) {
fprintf (stderr, "%s: test failed: server death not detected\n", argv[0]);
exit (EXIT_FAILURE);
}
/* Detection of the dead server completes all remaining in-flight commands */
if (nbd_aio_in_flight (nbd) != 0) {
fprintf (stderr, "%s: test failed: nbd_aio_in_flight\n", argv[0]);
exit (EXIT_FAILURE);
}
if (nbd_aio_peek_command_completed (nbd) != cookie) {
fprintf (stderr, "%s: test failed: nbd_aio_peek_command_completed\n",
argv[0]);
exit (EXIT_FAILURE);
}
if (nbd_aio_command_completed (nbd, cookie) != -1) {
fprintf (stderr, "%s: test failed: nbd_aio_command_completed\n", argv[0]);
exit (EXIT_FAILURE);
}
msg = nbd_get_error ();
err = nbd_get_errno ();
printf ("error: \"%s\"\n", msg);
printf ("errno: %d (%s)\n", err, strerror (err));
if (err != ENOTCONN) {
fprintf (stderr, "%s: test failed: unexpected errno %d (%s)\n", argv[0],
err, strerror (err));
exit (EXIT_FAILURE);
}
/* With all commands retired, no further command should be pending */
if (!trim_retired) {
fprintf (stderr, "%s: test failed: nbd_aio_trim_callback not retired\n",
argv[0]);
exit (EXIT_FAILURE);
}
if (nbd_aio_peek_command_completed (nbd) != -1) {
fprintf (stderr, "%s: test failed: nbd_aio_peek_command_completed\n",
argv[0]);
exit (EXIT_FAILURE);
}
msg = nbd_get_error ();
err = nbd_get_errno ();
printf ("error: \"%s\"\n", msg);
printf ("errno: %d (%s)\n", err, strerror (err));
if (err != EINVAL) {
fprintf (stderr, "%s: test failed: unexpected errno %d (%s)\n", argv[0],
err, strerror (err));
exit (EXIT_FAILURE);
}
nbd_close (nbd);
exit (EXIT_SUCCESS);
}
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