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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
*/
/* Check nbd_get_subprocess_pid looks sensible. */
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <stdint.h>
#include <inttypes.h>
#include <unistd.h>
#include <libnbd.h>
static char pidfile[] = "/tmp/libnbd-pid-XXXXXX";
int
main (int argc, char *argv[])
{
struct nbd_handle *nbd;
int fd;
int64_t pid;
FILE *fp;
char line[80];
const char *cmd[] = { NBDKIT,
"-s", "--exit-with-parent",
"-P", pidfile,
"memory", "size=1m", NULL };
if ((fd = mkstemp (pidfile)) == -1) {
perror (pidfile);
exit (EXIT_FAILURE);
}
close (fd);
nbd = nbd_create ();
if (nbd == NULL) {
fprintf (stderr, "%s: %s\n", argv[0], nbd_get_error ());
exit (EXIT_FAILURE);
}
if (nbd_connect_command (nbd, (char **)cmd) == -1) {
fprintf (stderr, "%s: %s\n", argv[0], nbd_get_error ());
exit (EXIT_FAILURE);
}
pid = nbd_get_subprocess_pid (nbd);
if (pid == -1) {
fprintf (stderr, "%s: %s\n", argv[0], nbd_get_error ());
exit (EXIT_FAILURE);
}
printf ("nbd_get_subprocess_pid returned %" PRIi64 "\n", pid);
nbd_close (nbd);
fp = fopen (pidfile, "r");
if (fp == NULL) {
pidfile_error:
fprintf (stderr, "%s: nbdkit did not write a pidfile: %m\n", argv[0]);
exit (EXIT_FAILURE);
}
if (fgets (line, sizeof line, fp) == NULL)
goto pidfile_error;
fclose (fp);
unlink (pidfile);
printf ("PID file written by nbdkit: %s", line);
/* The two PIDs should match. We could compare the two PIDs, but we
* don't as this might not work on all platforms and this is
* essentially a debugging API.
*/
exit (EXIT_SUCCESS);
}
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