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/* nbdkit
* Copyright Red Hat
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* * Neither the name of Red Hat nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <stdint.h>
#include <inttypes.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#undef NDEBUG /* Keep test strong even for nbdkit built without assertions */
#include <assert.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <libnbd.h>
#define SOCKET "pause.sock"
static bool command1_completed = false;
static bool command2_completed = false;
static int
callback (void *vp, int *err)
{
bool *flag = vp;
*flag = true;
return 1;
}
int
main (int argc, char *argv[])
{
struct nbd_handle *nbd;
int ctrlsock;
struct sockaddr_un addr;
char buf[512];
char c;
int64_t cookie;
time_t start_t, t;
nbd = nbd_create ();
if (nbd == NULL) {
fprintf (stderr, "%s\n", nbd_get_error ());
exit (EXIT_FAILURE);
}
if (nbd_connect_command (nbd,
(char *[]) {
"nbdkit", "-s", "--exit-with-parent",
"--filter", "pause",
"example1", "pause-control=" SOCKET,
NULL }) == -1) {
fprintf (stderr, "%s\n", nbd_get_error ());
exit (EXIT_FAILURE);
}
/* Connect separately to the pause control socket. */
ctrlsock = socket (AF_UNIX, SOCK_STREAM, 0);
if (ctrlsock == -1) {
perror ("socket");
exit (EXIT_FAILURE);
}
addr.sun_family = AF_UNIX;
strcpy (addr.sun_path, SOCKET);
if (connect (ctrlsock, (struct sockaddr *) &addr, sizeof addr) == -1) {
perror (SOCKET);
exit (EXIT_FAILURE);
}
/* To start with, we should be able to read synchronously normally. */
if (nbd_pread (nbd, buf, sizeof buf, 0, 0) == -1) {
fprintf (stderr, "%s\n", nbd_get_error ());
exit (EXIT_FAILURE);
}
/* Pause the connection. */
fprintf (stderr, "pausing the connection\n");
c = 'p';
if (write (ctrlsock, &c, 1) != 1) {
perror ("write: ctrlsock: pause");
exit (EXIT_FAILURE);
}
if (read (ctrlsock, &c, 1) != 1) {
perror ("read: ctrlsock: response to pause");
exit (EXIT_FAILURE);
}
assert (c == 'P');
/* Issue some asynchronous commands. These should hang. */
cookie = nbd_aio_pread (nbd, buf, sizeof buf, 0,
(nbd_completion_callback) {
.callback = callback,
.user_data = &command1_completed,
}, 0);
if (cookie == -1) {
fprintf (stderr, "%s\n", nbd_get_error ());
exit (EXIT_FAILURE);
}
cookie = nbd_aio_pread (nbd, buf, sizeof buf, 0,
(nbd_completion_callback) {
.callback = callback,
.user_data = &command2_completed,
}, 0);
if (cookie == -1) {
fprintf (stderr, "%s\n", nbd_get_error ());
exit (EXIT_FAILURE);
}
/* Wait a bit to check they don't complete. */
time (&start_t);
while (time (&t) <= start_t + 5)
nbd_poll (nbd, 1000);
assert (!command1_completed);
assert (!command2_completed);
/* Resume the connection. */
fprintf (stderr, "resuming the connection\n");
c = 'r';
if (write (ctrlsock, &c, 1) != 1) {
perror ("write: ctrlsock: resume");
exit (EXIT_FAILURE);
}
if (read (ctrlsock, &c, 1) != 1) {
perror ("read: ctrlsock: response to resume");
exit (EXIT_FAILURE);
}
assert (c == 'R');
/* Now at least one of the commands should complete. */
time (&start_t);
while (!command1_completed && !command2_completed &&
time (&t) <= start_t + 60)
nbd_poll (nbd, 1000);
assert (command1_completed || command2_completed);
close (ctrlsock);
nbd_shutdown (nbd, 0);
nbd_close (nbd);
exit (EXIT_SUCCESS);
}
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