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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 provoke some errors and check the error messages from
* nbd_get_error etc look reasonable.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/stat.h>
#include <libnbd.h>
#define MAXSIZE (65 * 1024 * 1024) /* Oversize on purpose */
static char *progname;
static char buf[MAXSIZE];
static void
check (int experr, const char *prefix)
{
const char *msg = nbd_get_error ();
int errnum = nbd_get_errno ();
fprintf (stderr, "error: \"%s\"\n", msg);
fprintf (stderr, "errno: %d (%s)\n", errnum, strerror (errnum));
if (strncmp (msg, prefix, strlen (prefix)) != 0) {
fprintf (stderr, "%s: test failed: missing context prefix: %s\n",
progname, msg);
exit (EXIT_FAILURE);
}
if (errnum != experr) {
fprintf (stderr, "%s: test failed: "
"expected errno = %d (%s), but got %d\n",
progname, experr, strerror (experr), errnum);
exit (EXIT_FAILURE);
}
}
static char script[] = "/tmp/libnbd-errors-scriptXXXXXX";
static char witness[] = "/tmp/libnbd-errors-witnessXXXXXX";
static int script_fd = -1, witness_fd = -1;
static void
cleanup (void)
{
if (script_fd != -1) {
if (script_fd >= 0)
close (script_fd);
unlink (script);
}
if (witness_fd >= 0) {
close (witness_fd);
unlink (witness);
}
}
int
main (int argc, char *argv[])
{
struct nbd_handle *nbd;
/* We will connect to a custom nbdkit sh plugin which always fails
* on reads (with a precise spelling required for older nbdkit), and
* which delays responding to writes until a witness file no longer
* exists.
*/
const char *cmd[] = { NBDKIT, "-s", "-v", "--exit-with-parent", "sh",
script, NULL };
progname = argv[0];
if (atexit (cleanup) != 0) {
perror ("atexit");
exit (EXIT_FAILURE);
}
if ((script_fd = mkstemp (script)) == -1) {
perror ("mkstemp");
exit (EXIT_FAILURE);
}
if ((witness_fd = mkstemp (witness)) == -1) {
perror ("mkstemp");
exit (EXIT_FAILURE);
}
if (dprintf (script_fd, "case $1 in\n"
" get_size) echo 128m || exit 1 ;;\n"
" thread_model) echo serialize_all_requests; exit 0 ;;\n"
" # XXX require 512-alignment, with new enough nbdkit\n"
" pread) printf 'ENOMEM ' >&2; exit 1 ;;\n"
" can_write) exit 0 ;;\n"
" pwrite)\n"
" while test -e %s; do sleep 1; done\n"
" exit 0;;\n"
" *) exit 2 ;;\n"
"esac\n", witness) < 0) {
perror ("dprintf");
exit (EXIT_FAILURE);
}
if (fchmod (script_fd, 0700) == -1) {
perror ("fchmod");
exit (EXIT_FAILURE);
}
if (close (script_fd) == -1) { /* Unlinked later during atexit */
perror ("close");
exit (EXIT_FAILURE);
}
script_fd = -2;
nbd = nbd_create ();
if (nbd == NULL) {
fprintf (stderr, "%s\n", nbd_get_error ());
exit (EXIT_FAILURE);
}
/* Connect to the server. */
if (nbd_connect_command (nbd, (char **)cmd) == -1) {
fprintf (stderr, "%s: %s\n", argv[0], nbd_get_error ());
exit (EXIT_FAILURE);
}
/* Send a read that the nbdkit sh plugin will fail. */
if (nbd_pread (nbd, buf, 512, 0, 0) != -1) {
fprintf (stderr, "%s: test failed: "
"nbd_pread did not report server failure\n",
argv[0]);
exit (EXIT_FAILURE);
}
check (ENOMEM, "nbd_pread: ");
/* Queue up two write commands so large that we block on POLLIN (the
* first might not block when under load, such as valgrind, but the
* second definitely will, since the nbdkit sh plugin reads only one
* command at a time and stalls on the first), then queue multiple
* disconnects.
*/
if (nbd_aio_pwrite (nbd, buf, 2 * 1024 * 1024, 0,
NBD_NULL_COMPLETION, 0) == -1) {
fprintf (stderr, "%s: %s\n", argv[0], nbd_get_error ());
exit (EXIT_FAILURE);
}
if (nbd_aio_pwrite (nbd, buf, 2 * 1024 * 1024, 0,
NBD_NULL_COMPLETION, 0) == -1) {
fprintf (stderr, "%s: %s\n", argv[0], nbd_get_error ());
exit (EXIT_FAILURE);
}
if ((nbd_aio_get_direction (nbd) & LIBNBD_AIO_DIRECTION_WRITE) == 0) {
fprintf (stderr, "%s: test failed: "
"expect to be blocked on write\n",
argv[0]);
exit (EXIT_FAILURE);
}
if (nbd_aio_disconnect (nbd, 0) == -1) {
fprintf (stderr, "%s: %s\n", argv[0], nbd_get_error ());
exit (EXIT_FAILURE);
}
if (nbd_aio_disconnect (nbd, 0) != -1) {
fprintf (stderr, "%s: test failed: "
"no diagnosis that nbd_aio_disconnect prevents new commands\n",
argv[0]);
exit (EXIT_FAILURE);
}
check (EINVAL, "nbd_aio_disconnect: ");
/* Unblock the nbdkit sh plugin */
if (close (witness_fd) == -1) {
perror ("close");
exit (EXIT_FAILURE);
}
witness_fd = -1;
if (unlink (witness) == -1) {
perror ("unlink");
exit (EXIT_FAILURE);
}
/* Flush the queue (whether this one fails is a race with how fast
* the server shuts down, so don't enforce status), then try to send
* another command while CLOSED/DEAD
*/
if (nbd_shutdown (nbd, 0) == -1) {
fprintf (stderr, "%s: ignoring %s\n", argv[0], nbd_get_error ());
}
else
fprintf (stderr, "%s: shutdown completed successfully\n", argv[0]);
if (nbd_pread (nbd, buf, 512, 0, 0) != -1) {
fprintf (stderr, "%s: test failed: "
"nbd_pread did not fail on non-connected handle\n",
argv[0]);
exit (EXIT_FAILURE);
}
check (EINVAL, "nbd_pread: ");
nbd_close (nbd);
exit (EXIT_SUCCESS);
}
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