xref: /qemu/qemu-nbd.c (revision 5672ee54d5b52b838e4e6b9976e757f28a68c4ec)
1cd831bd7Sths /*
27a5ca864Sbellard  *  Copyright (C) 2005  Anthony Liguori <anthony@codemonkey.ws>
37a5ca864Sbellard  *
47a5ca864Sbellard  *  Network Block Device
57a5ca864Sbellard  *
67a5ca864Sbellard  *  This program is free software; you can redistribute it and/or modify
77a5ca864Sbellard  *  it under the terms of the GNU General Public License as published by
87a5ca864Sbellard  *  the Free Software Foundation; under version 2 of the License.
97a5ca864Sbellard  *
107a5ca864Sbellard  *  This program is distributed in the hope that it will be useful,
117a5ca864Sbellard  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
127a5ca864Sbellard  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
137a5ca864Sbellard  *  GNU General Public License for more details.
147a5ca864Sbellard  *
157a5ca864Sbellard  *  You should have received a copy of the GNU General Public License
168167ee88SBlue Swirl  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
177a5ca864Sbellard  */
187a5ca864Sbellard 
195a61cb60SStefan Weil #include "qemu-common.h"
20737e150eSPaolo Bonzini #include "block/block.h"
21737e150eSPaolo Bonzini #include "block/nbd.h"
226a1751b7SAlex Bligh #include "qemu/main-loop.h"
23537b41f5SPaolo Bonzini #include "qemu/sockets.h"
24537b41f5SPaolo Bonzini #include "qemu/error-report.h"
258c116b0eSWenchao Xia #include "block/snapshot.h"
267a5ca864Sbellard 
277a5ca864Sbellard #include <stdarg.h>
287a5ca864Sbellard #include <stdio.h>
297a5ca864Sbellard #include <getopt.h>
307a5ca864Sbellard #include <err.h>
31cd831bd7Sths #include <sys/types.h>
327a5ca864Sbellard #include <sys/socket.h>
337a5ca864Sbellard #include <netinet/in.h>
347a5ca864Sbellard #include <netinet/tcp.h>
357a5ca864Sbellard #include <arpa/inet.h>
36cd831bd7Sths #include <signal.h>
372bff4b6fSBlue Swirl #include <libgen.h>
38a517e88bSPaolo Bonzini #include <pthread.h>
39cd831bd7Sths 
40cd831bd7Sths #define SOCKET_PATH          "/var/lock/qemu-nbd-%s"
4139a5235cSPaolo Bonzini #define QEMU_NBD_OPT_CACHE   1
4239a5235cSPaolo Bonzini #define QEMU_NBD_OPT_AIO     2
43ded9d2d5SPaolo Bonzini #define QEMU_NBD_OPT_DISCARD 3
447a5ca864Sbellard 
45af49bbbeSPaolo Bonzini static NBDExport *exp;
46b1d8e52eSblueswir1 static int verbose;
47a517e88bSPaolo Bonzini static char *srcpath;
48a517e88bSPaolo Bonzini static char *sockpath;
497860a380SPaolo Bonzini static int persistent = 0;
507860a380SPaolo Bonzini static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state;
51a61c6782SPaolo Bonzini static int shared = 1;
52a61c6782SPaolo Bonzini static int nb_fds;
537a5ca864Sbellard 
547a5ca864Sbellard static void usage(const char *name)
557a5ca864Sbellard {
56b033cd86SPaolo Bonzini     (printf) (
577a5ca864Sbellard "Usage: %s [OPTIONS] FILE\n"
587a5ca864Sbellard "QEMU Disk Network Block Device Server\n"
597a5ca864Sbellard "\n"
607a5ca864Sbellard "  -h, --help           display this help and exit\n"
617a5ca864Sbellard "  -V, --version        output version information and exit\n"
627a5ca864Sbellard "\n"
63b033cd86SPaolo Bonzini "Connection properties:\n"
64b033cd86SPaolo Bonzini "  -p, --port=PORT      port to listen on (default `%d')\n"
65b033cd86SPaolo Bonzini "  -b, --bind=IFACE     interface to bind to (default `0.0.0.0')\n"
66b033cd86SPaolo Bonzini "  -k, --socket=PATH    path to the unix socket\n"
67b033cd86SPaolo Bonzini "                       (default '"SOCKET_PATH"')\n"
68b033cd86SPaolo Bonzini "  -e, --shared=NUM     device can be shared by NUM clients (default '1')\n"
69b033cd86SPaolo Bonzini "  -t, --persistent     don't exit on the last connection\n"
70b033cd86SPaolo Bonzini "  -v, --verbose        display extra debugging information\n"
71b033cd86SPaolo Bonzini "\n"
72b033cd86SPaolo Bonzini "Exposing part of the image:\n"
73b033cd86SPaolo Bonzini "  -o, --offset=OFFSET  offset into the image\n"
74b033cd86SPaolo Bonzini "  -P, --partition=NUM  only expose partition NUM\n"
75b033cd86SPaolo Bonzini "\n"
76b033cd86SPaolo Bonzini #ifdef __linux__
77b033cd86SPaolo Bonzini "Kernel NBD client support:\n"
78b033cd86SPaolo Bonzini "  -c, --connect=DEV    connect FILE to the local NBD device DEV\n"
79b033cd86SPaolo Bonzini "  -d, --disconnect     disconnect the specified device\n"
80b033cd86SPaolo Bonzini "\n"
81b033cd86SPaolo Bonzini #endif
82b033cd86SPaolo Bonzini "\n"
83b033cd86SPaolo Bonzini "Block device options:\n"
844323fdcfSWenchao Xia "  -f, --format=FORMAT  set image format (raw, qcow2, ...)\n"
85b033cd86SPaolo Bonzini "  -r, --read-only      export read-only\n"
868c116b0eSWenchao Xia "  -s, --snapshot       use FILE as an external snapshot, create a temporary\n"
878c116b0eSWenchao Xia "                       file with backing_file=FILE, redirect the write to\n"
888c116b0eSWenchao Xia "                       the temporary one\n"
898c116b0eSWenchao Xia "  -l, --load-snapshot=SNAPSHOT_PARAM\n"
908c116b0eSWenchao Xia "                       load an internal snapshot inside FILE and export it\n"
918c116b0eSWenchao Xia "                       as an read-only device, SNAPSHOT_PARAM format is\n"
928c116b0eSWenchao Xia "                       'snapshot.id=[ID],snapshot.name=[NAME]', or\n"
938c116b0eSWenchao Xia "                       '[ID_OR_NAME]'\n"
94b033cd86SPaolo Bonzini "  -n, --nocache        disable host cache\n"
9539a5235cSPaolo Bonzini "      --cache=MODE     set cache mode (none, writeback, ...)\n"
9639a5235cSPaolo Bonzini #ifdef CONFIG_LINUX_AIO
9739a5235cSPaolo Bonzini "      --aio=MODE       set AIO mode (native or threads)\n"
9839a5235cSPaolo Bonzini #endif
99b033cd86SPaolo Bonzini "\n"
100b033cd86SPaolo Bonzini "Report bugs to <qemu-devel@nongnu.org>\n"
101c2e2872bSLaurent Vivier     , name, NBD_DEFAULT_PORT, "DEVICE");
1027a5ca864Sbellard }
1037a5ca864Sbellard 
1047a5ca864Sbellard static void version(const char *name)
1057a5ca864Sbellard {
1067a5ca864Sbellard     printf(
107315bc7aaSths "%s version 0.0.1\n"
1087a5ca864Sbellard "Written by Anthony Liguori.\n"
1097a5ca864Sbellard "\n"
1107a5ca864Sbellard "Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.\n"
1117a5ca864Sbellard "This is free software; see the source for copying conditions.  There is NO\n"
1127a5ca864Sbellard "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
113315bc7aaSths     , name);
1147a5ca864Sbellard }
1157a5ca864Sbellard 
1167a5ca864Sbellard struct partition_record
1177a5ca864Sbellard {
1187a5ca864Sbellard     uint8_t bootable;
1197a5ca864Sbellard     uint8_t start_head;
1207a5ca864Sbellard     uint32_t start_cylinder;
1217a5ca864Sbellard     uint8_t start_sector;
1227a5ca864Sbellard     uint8_t system;
1237a5ca864Sbellard     uint8_t end_head;
1247a5ca864Sbellard     uint8_t end_cylinder;
1257a5ca864Sbellard     uint8_t end_sector;
1267a5ca864Sbellard     uint32_t start_sector_abs;
1277a5ca864Sbellard     uint32_t nb_sectors_abs;
1287a5ca864Sbellard };
1297a5ca864Sbellard 
1307a5ca864Sbellard static void read_partition(uint8_t *p, struct partition_record *r)
1317a5ca864Sbellard {
1327a5ca864Sbellard     r->bootable = p[0];
1337a5ca864Sbellard     r->start_head = p[1];
1347a5ca864Sbellard     r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300);
1357a5ca864Sbellard     r->start_sector = p[2] & 0x3f;
1367a5ca864Sbellard     r->system = p[4];
1377a5ca864Sbellard     r->end_head = p[5];
1387a5ca864Sbellard     r->end_cylinder = p[7] | ((p[6] << 2) & 0x300);
1397a5ca864Sbellard     r->end_sector = p[6] & 0x3f;
1407a5ca864Sbellard     r->start_sector_abs = p[8] | p[9] << 8 | p[10] << 16 | p[11] << 24;
1417a5ca864Sbellard     r->nb_sectors_abs = p[12] | p[13] << 8 | p[14] << 16 | p[15] << 24;
1427a5ca864Sbellard }
1437a5ca864Sbellard 
1447a5ca864Sbellard static int find_partition(BlockDriverState *bs, int partition,
1457a5ca864Sbellard                           off_t *offset, off_t *size)
1467a5ca864Sbellard {
1477a5ca864Sbellard     struct partition_record mbr[4];
1487a5ca864Sbellard     uint8_t data[512];
1497a5ca864Sbellard     int i;
1507a5ca864Sbellard     int ext_partnum = 4;
151cb7cf0e3SRyota Ozaki     int ret;
1527a5ca864Sbellard 
153cb7cf0e3SRyota Ozaki     if ((ret = bdrv_read(bs, 0, data, 1)) < 0) {
154cb7cf0e3SRyota Ozaki         errno = -ret;
155cb7cf0e3SRyota Ozaki         err(EXIT_FAILURE, "error while reading");
156cb7cf0e3SRyota Ozaki     }
1577a5ca864Sbellard 
1587a5ca864Sbellard     if (data[510] != 0x55 || data[511] != 0xaa) {
159185b4338SPaolo Bonzini         return -EINVAL;
1607a5ca864Sbellard     }
1617a5ca864Sbellard 
1627a5ca864Sbellard     for (i = 0; i < 4; i++) {
1637a5ca864Sbellard         read_partition(&data[446 + 16 * i], &mbr[i]);
1647a5ca864Sbellard 
1657a5ca864Sbellard         if (!mbr[i].nb_sectors_abs)
1667a5ca864Sbellard             continue;
1677a5ca864Sbellard 
1687a5ca864Sbellard         if (mbr[i].system == 0xF || mbr[i].system == 0x5) {
1697a5ca864Sbellard             struct partition_record ext[4];
1707a5ca864Sbellard             uint8_t data1[512];
1717a5ca864Sbellard             int j;
1727a5ca864Sbellard 
173cb7cf0e3SRyota Ozaki             if ((ret = bdrv_read(bs, mbr[i].start_sector_abs, data1, 1)) < 0) {
174cb7cf0e3SRyota Ozaki                 errno = -ret;
175cb7cf0e3SRyota Ozaki                 err(EXIT_FAILURE, "error while reading");
176cb7cf0e3SRyota Ozaki             }
1777a5ca864Sbellard 
1787a5ca864Sbellard             for (j = 0; j < 4; j++) {
1797a5ca864Sbellard                 read_partition(&data1[446 + 16 * j], &ext[j]);
1807a5ca864Sbellard                 if (!ext[j].nb_sectors_abs)
1817a5ca864Sbellard                     continue;
1827a5ca864Sbellard 
1837a5ca864Sbellard                 if ((ext_partnum + j + 1) == partition) {
1847a5ca864Sbellard                     *offset = (uint64_t)ext[j].start_sector_abs << 9;
1857a5ca864Sbellard                     *size = (uint64_t)ext[j].nb_sectors_abs << 9;
1867a5ca864Sbellard                     return 0;
1877a5ca864Sbellard                 }
1887a5ca864Sbellard             }
1897a5ca864Sbellard             ext_partnum += 4;
1907a5ca864Sbellard         } else if ((i + 1) == partition) {
1917a5ca864Sbellard             *offset = (uint64_t)mbr[i].start_sector_abs << 9;
1927a5ca864Sbellard             *size = (uint64_t)mbr[i].nb_sectors_abs << 9;
1937a5ca864Sbellard             return 0;
1947a5ca864Sbellard         }
1957a5ca864Sbellard     }
1967a5ca864Sbellard 
197185b4338SPaolo Bonzini     return -ENOENT;
1987a5ca864Sbellard }
1997a5ca864Sbellard 
200bb345110SPaolo Bonzini static void termsig_handler(int signum)
201bb345110SPaolo Bonzini {
2027860a380SPaolo Bonzini     state = TERMINATE;
203a61c6782SPaolo Bonzini     qemu_notify_event();
204bb345110SPaolo Bonzini }
205bb345110SPaolo Bonzini 
206537b41f5SPaolo Bonzini static void combine_addr(char *buf, size_t len, const char* address,
207537b41f5SPaolo Bonzini                          uint16_t port)
208537b41f5SPaolo Bonzini {
209537b41f5SPaolo Bonzini     /* If the address-part contains a colon, it's an IPv6 IP so needs [] */
210537b41f5SPaolo Bonzini     if (strstr(address, ":")) {
211537b41f5SPaolo Bonzini         snprintf(buf, len, "[%s]:%u", address, port);
212537b41f5SPaolo Bonzini     } else {
213537b41f5SPaolo Bonzini         snprintf(buf, len, "%s:%u", address, port);
214537b41f5SPaolo Bonzini     }
215537b41f5SPaolo Bonzini }
216537b41f5SPaolo Bonzini 
217537b41f5SPaolo Bonzini static int tcp_socket_incoming(const char *address, uint16_t port)
218537b41f5SPaolo Bonzini {
219537b41f5SPaolo Bonzini     char address_and_port[128];
220537b41f5SPaolo Bonzini     Error *local_err = NULL;
221537b41f5SPaolo Bonzini 
222537b41f5SPaolo Bonzini     combine_addr(address_and_port, 128, address, port);
223537b41f5SPaolo Bonzini     int fd = inet_listen(address_and_port, NULL, 0, SOCK_STREAM, 0, &local_err);
224537b41f5SPaolo Bonzini 
225537b41f5SPaolo Bonzini     if (local_err != NULL) {
226537b41f5SPaolo Bonzini         qerror_report_err(local_err);
227537b41f5SPaolo Bonzini         error_free(local_err);
228537b41f5SPaolo Bonzini     }
229537b41f5SPaolo Bonzini     return fd;
230537b41f5SPaolo Bonzini }
231537b41f5SPaolo Bonzini 
232537b41f5SPaolo Bonzini static int unix_socket_incoming(const char *path)
233537b41f5SPaolo Bonzini {
234537b41f5SPaolo Bonzini     Error *local_err = NULL;
235537b41f5SPaolo Bonzini     int fd = unix_listen(path, NULL, 0, &local_err);
236537b41f5SPaolo Bonzini 
237537b41f5SPaolo Bonzini     if (local_err != NULL) {
238537b41f5SPaolo Bonzini         qerror_report_err(local_err);
239537b41f5SPaolo Bonzini         error_free(local_err);
240537b41f5SPaolo Bonzini     }
241537b41f5SPaolo Bonzini     return fd;
242537b41f5SPaolo Bonzini }
243537b41f5SPaolo Bonzini 
244537b41f5SPaolo Bonzini static int unix_socket_outgoing(const char *path)
245537b41f5SPaolo Bonzini {
246537b41f5SPaolo Bonzini     Error *local_err = NULL;
247537b41f5SPaolo Bonzini     int fd = unix_connect(path, &local_err);
248537b41f5SPaolo Bonzini 
249537b41f5SPaolo Bonzini     if (local_err != NULL) {
250537b41f5SPaolo Bonzini         qerror_report_err(local_err);
251537b41f5SPaolo Bonzini         error_free(local_err);
252537b41f5SPaolo Bonzini     }
253537b41f5SPaolo Bonzini     return fd;
254537b41f5SPaolo Bonzini }
255537b41f5SPaolo Bonzini 
256a517e88bSPaolo Bonzini static void *show_parts(void *arg)
257cd831bd7Sths {
258a6ac2313SPaolo Bonzini     char *device = arg;
259cd831bd7Sths     int nbd;
260cd831bd7Sths 
261cd831bd7Sths     /* linux just needs an open() to trigger
262cd831bd7Sths      * the partition table update
263cd831bd7Sths      * but remember to load the module with max_part != 0 :
264cd831bd7Sths      *     modprobe nbd max_part=63
265cd831bd7Sths      */
266cd831bd7Sths     nbd = open(device, O_RDWR);
267fc19f8a0SPaolo Bonzini     if (nbd >= 0) {
268cd831bd7Sths         close(nbd);
269cd831bd7Sths     }
270a517e88bSPaolo Bonzini     return NULL;
271a517e88bSPaolo Bonzini }
272a517e88bSPaolo Bonzini 
273a517e88bSPaolo Bonzini static void *nbd_client_thread(void *arg)
274a517e88bSPaolo Bonzini {
275a6ac2313SPaolo Bonzini     char *device = arg;
276a517e88bSPaolo Bonzini     off_t size;
277a517e88bSPaolo Bonzini     size_t blocksize;
278a517e88bSPaolo Bonzini     uint32_t nbdflags;
279a6ac2313SPaolo Bonzini     int fd, sock;
280a517e88bSPaolo Bonzini     int ret;
281a517e88bSPaolo Bonzini     pthread_t show_parts_thread;
282a517e88bSPaolo Bonzini 
283a517e88bSPaolo Bonzini     sock = unix_socket_outgoing(sockpath);
284fc19f8a0SPaolo Bonzini     if (sock < 0) {
285a517e88bSPaolo Bonzini         goto out;
286a517e88bSPaolo Bonzini     }
287a517e88bSPaolo Bonzini 
288a517e88bSPaolo Bonzini     ret = nbd_receive_negotiate(sock, NULL, &nbdflags,
289a517e88bSPaolo Bonzini                                 &size, &blocksize);
290fc19f8a0SPaolo Bonzini     if (ret < 0) {
2910c544d73SPaolo Bonzini         goto out_socket;
292a517e88bSPaolo Bonzini     }
293a517e88bSPaolo Bonzini 
294a6ac2313SPaolo Bonzini     fd = open(device, O_RDWR);
295fc19f8a0SPaolo Bonzini     if (fd < 0) {
296a6ac2313SPaolo Bonzini         /* Linux-only, we can use %m in printf.  */
297*5672ee54SHani Benhabiles         fprintf(stderr, "Failed to open %s: %m\n", device);
2980c544d73SPaolo Bonzini         goto out_socket;
299a6ac2313SPaolo Bonzini     }
300a6ac2313SPaolo Bonzini 
301a517e88bSPaolo Bonzini     ret = nbd_init(fd, sock, nbdflags, size, blocksize);
302fc19f8a0SPaolo Bonzini     if (ret < 0) {
3030c544d73SPaolo Bonzini         goto out_fd;
304a517e88bSPaolo Bonzini     }
305a517e88bSPaolo Bonzini 
306a517e88bSPaolo Bonzini     /* update partition table */
307a6ac2313SPaolo Bonzini     pthread_create(&show_parts_thread, NULL, show_parts, device);
308a517e88bSPaolo Bonzini 
309c1f8fdc3SPaolo Bonzini     if (verbose) {
310a517e88bSPaolo Bonzini         fprintf(stderr, "NBD device %s is now connected to %s\n",
311a517e88bSPaolo Bonzini                 device, srcpath);
312c1f8fdc3SPaolo Bonzini     } else {
313c1f8fdc3SPaolo Bonzini         /* Close stderr so that the qemu-nbd process exits.  */
314c1f8fdc3SPaolo Bonzini         dup2(STDOUT_FILENO, STDERR_FILENO);
315c1f8fdc3SPaolo Bonzini     }
316a517e88bSPaolo Bonzini 
317a517e88bSPaolo Bonzini     ret = nbd_client(fd);
318a517e88bSPaolo Bonzini     if (ret) {
3190c544d73SPaolo Bonzini         goto out_fd;
320a517e88bSPaolo Bonzini     }
321a517e88bSPaolo Bonzini     close(fd);
322a517e88bSPaolo Bonzini     kill(getpid(), SIGTERM);
323a517e88bSPaolo Bonzini     return (void *) EXIT_SUCCESS;
324a517e88bSPaolo Bonzini 
3250c544d73SPaolo Bonzini out_fd:
3260c544d73SPaolo Bonzini     close(fd);
3270c544d73SPaolo Bonzini out_socket:
3280c544d73SPaolo Bonzini     closesocket(sock);
329a517e88bSPaolo Bonzini out:
330a517e88bSPaolo Bonzini     kill(getpid(), SIGTERM);
331a517e88bSPaolo Bonzini     return (void *) EXIT_FAILURE;
332cd831bd7Sths }
333cd831bd7Sths 
334a61c6782SPaolo Bonzini static int nbd_can_accept(void *opaque)
335a61c6782SPaolo Bonzini {
336a61c6782SPaolo Bonzini     return nb_fds < shared;
337a61c6782SPaolo Bonzini }
338a61c6782SPaolo Bonzini 
3397860a380SPaolo Bonzini static void nbd_export_closed(NBDExport *exp)
3407860a380SPaolo Bonzini {
3417860a380SPaolo Bonzini     assert(state == TERMINATING);
3427860a380SPaolo Bonzini     state = TERMINATED;
3437860a380SPaolo Bonzini }
3447860a380SPaolo Bonzini 
3451743b515SPaolo Bonzini static void nbd_client_closed(NBDClient *client)
346a61c6782SPaolo Bonzini {
347a61c6782SPaolo Bonzini     nb_fds--;
3487860a380SPaolo Bonzini     if (nb_fds == 0 && !persistent && state == RUNNING) {
3497860a380SPaolo Bonzini         state = TERMINATE;
3507860a380SPaolo Bonzini     }
3511743b515SPaolo Bonzini     qemu_notify_event();
3527860a380SPaolo Bonzini     nbd_client_put(client);
353a61c6782SPaolo Bonzini }
354a61c6782SPaolo Bonzini 
355a61c6782SPaolo Bonzini static void nbd_accept(void *opaque)
356a61c6782SPaolo Bonzini {
357a61c6782SPaolo Bonzini     int server_fd = (uintptr_t) opaque;
358a61c6782SPaolo Bonzini     struct sockaddr_in addr;
359a61c6782SPaolo Bonzini     socklen_t addr_len = sizeof(addr);
360a61c6782SPaolo Bonzini 
361a61c6782SPaolo Bonzini     int fd = accept(server_fd, (struct sockaddr *)&addr, &addr_len);
3620c544d73SPaolo Bonzini     if (fd < 0) {
3630c544d73SPaolo Bonzini         perror("accept");
3640c544d73SPaolo Bonzini         return;
3650c544d73SPaolo Bonzini     }
3660c544d73SPaolo Bonzini 
3677860a380SPaolo Bonzini     if (state >= TERMINATE) {
3687860a380SPaolo Bonzini         close(fd);
3697860a380SPaolo Bonzini         return;
3707860a380SPaolo Bonzini     }
3717860a380SPaolo Bonzini 
37236af5994SHani Benhabiles     if (nbd_client_new(exp, fd, nbd_client_closed)) {
373a61c6782SPaolo Bonzini         nb_fds++;
37436af5994SHani Benhabiles     } else {
37536af5994SHani Benhabiles         close(fd);
376a61c6782SPaolo Bonzini     }
377a61c6782SPaolo Bonzini }
378a61c6782SPaolo Bonzini 
3797a5ca864Sbellard int main(int argc, char **argv)
3807a5ca864Sbellard {
3817a5ca864Sbellard     BlockDriverState *bs;
382e6b63677SDaniel P. Berrange     BlockDriver *drv;
3837a5ca864Sbellard     off_t dev_offset = 0;
384b90fb4b8SPaolo Bonzini     uint32_t nbdflags = 0;
385cd831bd7Sths     bool disconnect = false;
3867a5ca864Sbellard     const char *bindto = "0.0.0.0";
387a6ac2313SPaolo Bonzini     char *device = NULL;
388c2e2872bSLaurent Vivier     int port = NBD_DEFAULT_PORT;
3897a5ca864Sbellard     off_t fd_size;
3908c116b0eSWenchao Xia     QemuOpts *sn_opts = NULL;
3918c116b0eSWenchao Xia     const char *sn_id_or_name = NULL;
3928c116b0eSWenchao Xia     const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f:tl:";
3937a5ca864Sbellard     struct option lopt[] = {
394660f11beSBlue Swirl         { "help", 0, NULL, 'h' },
395660f11beSBlue Swirl         { "version", 0, NULL, 'V' },
396660f11beSBlue Swirl         { "bind", 1, NULL, 'b' },
397660f11beSBlue Swirl         { "port", 1, NULL, 'p' },
398660f11beSBlue Swirl         { "socket", 1, NULL, 'k' },
399660f11beSBlue Swirl         { "offset", 1, NULL, 'o' },
400660f11beSBlue Swirl         { "read-only", 0, NULL, 'r' },
401660f11beSBlue Swirl         { "partition", 1, NULL, 'P' },
402660f11beSBlue Swirl         { "connect", 1, NULL, 'c' },
403660f11beSBlue Swirl         { "disconnect", 0, NULL, 'd' },
404660f11beSBlue Swirl         { "snapshot", 0, NULL, 's' },
4058c116b0eSWenchao Xia         { "load-snapshot", 1, NULL, 'l' },
406660f11beSBlue Swirl         { "nocache", 0, NULL, 'n' },
40739a5235cSPaolo Bonzini         { "cache", 1, NULL, QEMU_NBD_OPT_CACHE },
40839a5235cSPaolo Bonzini #ifdef CONFIG_LINUX_AIO
40939a5235cSPaolo Bonzini         { "aio", 1, NULL, QEMU_NBD_OPT_AIO },
41039a5235cSPaolo Bonzini #endif
411ded9d2d5SPaolo Bonzini         { "discard", 1, NULL, QEMU_NBD_OPT_DISCARD },
412660f11beSBlue Swirl         { "shared", 1, NULL, 'e' },
413e6b63677SDaniel P. Berrange         { "format", 1, NULL, 'f' },
414660f11beSBlue Swirl         { "persistent", 0, NULL, 't' },
415660f11beSBlue Swirl         { "verbose", 0, NULL, 'v' },
416660f11beSBlue Swirl         { NULL, 0, NULL, 0 }
4177a5ca864Sbellard     };
4187a5ca864Sbellard     int ch;
4197a5ca864Sbellard     int opt_ind = 0;
4207a5ca864Sbellard     int li;
4217a5ca864Sbellard     char *end;
422f5edb014SNaphtali Sprei     int flags = BDRV_O_RDWR;
4237a5ca864Sbellard     int partition = -1;
424cd831bd7Sths     int ret;
4253b05a8e9Sths     int fd;
42639a5235cSPaolo Bonzini     bool seen_cache = false;
427ded9d2d5SPaolo Bonzini     bool seen_discard = false;
42839a5235cSPaolo Bonzini #ifdef CONFIG_LINUX_AIO
42939a5235cSPaolo Bonzini     bool seen_aio = false;
43039a5235cSPaolo Bonzini #endif
431a517e88bSPaolo Bonzini     pthread_t client_thread;
432e6b63677SDaniel P. Berrange     const char *fmt = NULL;
43334b5d2c6SMax Reitz     Error *local_err = NULL;
4347a5ca864Sbellard 
435a517e88bSPaolo Bonzini     /* The client thread uses SIGTERM to interrupt the server.  A signal
436a517e88bSPaolo Bonzini      * handler ensures that "qemu-nbd -v -c" exits with a nice status code.
437a517e88bSPaolo Bonzini      */
438bb345110SPaolo Bonzini     struct sigaction sa_sigterm;
439bb345110SPaolo Bonzini     memset(&sa_sigterm, 0, sizeof(sa_sigterm));
440bb345110SPaolo Bonzini     sa_sigterm.sa_handler = termsig_handler;
441bb345110SPaolo Bonzini     sigaction(SIGTERM, &sa_sigterm, NULL);
44210f5bff6SFam Zheng     qemu_init_exec_dir(argv[0]);
443bb345110SPaolo Bonzini 
4447a5ca864Sbellard     while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
4457a5ca864Sbellard         switch (ch) {
4467a5ca864Sbellard         case 's':
4472f726488Sths             flags |= BDRV_O_SNAPSHOT;
4482f726488Sths             break;
4492f726488Sths         case 'n':
45039a5235cSPaolo Bonzini             optarg = (char *) "none";
45139a5235cSPaolo Bonzini             /* fallthrough */
45239a5235cSPaolo Bonzini         case QEMU_NBD_OPT_CACHE:
45339a5235cSPaolo Bonzini             if (seen_cache) {
45439a5235cSPaolo Bonzini                 errx(EXIT_FAILURE, "-n and --cache can only be specified once");
45539a5235cSPaolo Bonzini             }
45639a5235cSPaolo Bonzini             seen_cache = true;
45739a5235cSPaolo Bonzini             if (bdrv_parse_cache_flags(optarg, &flags) == -1) {
45839a5235cSPaolo Bonzini                 errx(EXIT_FAILURE, "Invalid cache mode `%s'", optarg);
45939a5235cSPaolo Bonzini             }
4607a5ca864Sbellard             break;
46139a5235cSPaolo Bonzini #ifdef CONFIG_LINUX_AIO
46239a5235cSPaolo Bonzini         case QEMU_NBD_OPT_AIO:
46339a5235cSPaolo Bonzini             if (seen_aio) {
46439a5235cSPaolo Bonzini                 errx(EXIT_FAILURE, "--aio can only be specified once");
46539a5235cSPaolo Bonzini             }
46639a5235cSPaolo Bonzini             seen_aio = true;
46739a5235cSPaolo Bonzini             if (!strcmp(optarg, "native")) {
46839a5235cSPaolo Bonzini                 flags |= BDRV_O_NATIVE_AIO;
46939a5235cSPaolo Bonzini             } else if (!strcmp(optarg, "threads")) {
47039a5235cSPaolo Bonzini                 /* this is the default */
47139a5235cSPaolo Bonzini             } else {
47239a5235cSPaolo Bonzini                errx(EXIT_FAILURE, "invalid aio mode `%s'", optarg);
47339a5235cSPaolo Bonzini             }
47439a5235cSPaolo Bonzini             break;
47539a5235cSPaolo Bonzini #endif
476ded9d2d5SPaolo Bonzini         case QEMU_NBD_OPT_DISCARD:
477ded9d2d5SPaolo Bonzini             if (seen_discard) {
478ded9d2d5SPaolo Bonzini                 errx(EXIT_FAILURE, "--discard can only be specified once");
479ded9d2d5SPaolo Bonzini             }
480ded9d2d5SPaolo Bonzini             seen_discard = true;
481ded9d2d5SPaolo Bonzini             if (bdrv_parse_discard_flags(optarg, &flags) == -1) {
482ded9d2d5SPaolo Bonzini                 errx(EXIT_FAILURE, "Invalid discard mode `%s'", optarg);
483ded9d2d5SPaolo Bonzini             }
484ded9d2d5SPaolo Bonzini             break;
4857a5ca864Sbellard         case 'b':
4867a5ca864Sbellard             bindto = optarg;
4877a5ca864Sbellard             break;
4887a5ca864Sbellard         case 'p':
4897a5ca864Sbellard             li = strtol(optarg, &end, 0);
4907a5ca864Sbellard             if (*end) {
491b6353beaSRyota Ozaki                 errx(EXIT_FAILURE, "Invalid port `%s'", optarg);
4927a5ca864Sbellard             }
4937a5ca864Sbellard             if (li < 1 || li > 65535) {
494b6353beaSRyota Ozaki                 errx(EXIT_FAILURE, "Port out of range `%s'", optarg);
4957a5ca864Sbellard             }
4967a5ca864Sbellard             port = (uint16_t)li;
4977a5ca864Sbellard             break;
4987a5ca864Sbellard         case 'o':
4997a5ca864Sbellard                 dev_offset = strtoll (optarg, &end, 0);
5007a5ca864Sbellard             if (*end) {
501b6353beaSRyota Ozaki                 errx(EXIT_FAILURE, "Invalid offset `%s'", optarg);
5027a5ca864Sbellard             }
5037a5ca864Sbellard             if (dev_offset < 0) {
504b6353beaSRyota Ozaki                 errx(EXIT_FAILURE, "Offset must be positive `%s'", optarg);
5057a5ca864Sbellard             }
5067a5ca864Sbellard             break;
5078c116b0eSWenchao Xia         case 'l':
5088c116b0eSWenchao Xia             if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) {
5098c116b0eSWenchao Xia                 sn_opts = qemu_opts_parse(&internal_snapshot_opts, optarg, 0);
5108c116b0eSWenchao Xia                 if (!sn_opts) {
5118c116b0eSWenchao Xia                     errx(EXIT_FAILURE, "Failed in parsing snapshot param `%s'",
5128c116b0eSWenchao Xia                          optarg);
5138c116b0eSWenchao Xia                 }
5148c116b0eSWenchao Xia             } else {
5158c116b0eSWenchao Xia                 sn_id_or_name = optarg;
5168c116b0eSWenchao Xia             }
5178c116b0eSWenchao Xia             /* fall through */
5187a5ca864Sbellard         case 'r':
519b90fb4b8SPaolo Bonzini             nbdflags |= NBD_FLAG_READ_ONLY;
52007108b29SNaphtali Sprei             flags &= ~BDRV_O_RDWR;
5217a5ca864Sbellard             break;
5227a5ca864Sbellard         case 'P':
5237a5ca864Sbellard             partition = strtol(optarg, &end, 0);
5247a5ca864Sbellard             if (*end)
525b6353beaSRyota Ozaki                 errx(EXIT_FAILURE, "Invalid partition `%s'", optarg);
5267a5ca864Sbellard             if (partition < 1 || partition > 8)
527b6353beaSRyota Ozaki                 errx(EXIT_FAILURE, "Invalid partition %d", partition);
5287a5ca864Sbellard             break;
529cd831bd7Sths         case 'k':
530b32f6c28SPaolo Bonzini             sockpath = optarg;
531b32f6c28SPaolo Bonzini             if (sockpath[0] != '/')
532b6353beaSRyota Ozaki                 errx(EXIT_FAILURE, "socket path must be absolute\n");
533cd831bd7Sths             break;
534cd831bd7Sths         case 'd':
535cd831bd7Sths             disconnect = true;
536cd831bd7Sths             break;
537cd831bd7Sths         case 'c':
538cd831bd7Sths             device = optarg;
539cd831bd7Sths             break;
5403b05a8e9Sths         case 'e':
5413b05a8e9Sths             shared = strtol(optarg, &end, 0);
5423b05a8e9Sths             if (*end) {
543b6353beaSRyota Ozaki                 errx(EXIT_FAILURE, "Invalid shared device number '%s'", optarg);
5443b05a8e9Sths             }
5453b05a8e9Sths             if (shared < 1) {
546b6353beaSRyota Ozaki                 errx(EXIT_FAILURE, "Shared device number must be greater than 0\n");
5473b05a8e9Sths             }
5483b05a8e9Sths             break;
549e6b63677SDaniel P. Berrange         case 'f':
550e6b63677SDaniel P. Berrange             fmt = optarg;
551e6b63677SDaniel P. Berrange             break;
55275818250Sths 	case 't':
55375818250Sths 	    persistent = 1;
55475818250Sths 	    break;
5557a5ca864Sbellard         case 'v':
5567a5ca864Sbellard             verbose = 1;
5577a5ca864Sbellard             break;
5587a5ca864Sbellard         case 'V':
5597a5ca864Sbellard             version(argv[0]);
5607a5ca864Sbellard             exit(0);
5617a5ca864Sbellard             break;
5627a5ca864Sbellard         case 'h':
5637a5ca864Sbellard             usage(argv[0]);
5647a5ca864Sbellard             exit(0);
5657a5ca864Sbellard             break;
5667a5ca864Sbellard         case '?':
567b6353beaSRyota Ozaki             errx(EXIT_FAILURE, "Try `%s --help' for more information.",
5687a5ca864Sbellard                  argv[0]);
5697a5ca864Sbellard         }
5707a5ca864Sbellard     }
5717a5ca864Sbellard 
5727a5ca864Sbellard     if ((argc - optind) != 1) {
573b6353beaSRyota Ozaki         errx(EXIT_FAILURE, "Invalid number of argument.\n"
5747a5ca864Sbellard              "Try `%s --help' for more information.",
5757a5ca864Sbellard              argv[0]);
5767a5ca864Sbellard     }
5777a5ca864Sbellard 
578cd831bd7Sths     if (disconnect) {
579cd831bd7Sths         fd = open(argv[optind], O_RDWR);
580fc19f8a0SPaolo Bonzini         if (fd < 0) {
581cb7cf0e3SRyota Ozaki             err(EXIT_FAILURE, "Cannot open %s", argv[optind]);
582fc19f8a0SPaolo Bonzini         }
583cd831bd7Sths         nbd_disconnect(fd);
584cd831bd7Sths 
585cd831bd7Sths         close(fd);
586cd831bd7Sths 
587cd831bd7Sths         printf("%s disconnected\n", argv[optind]);
588cd831bd7Sths 
589cd831bd7Sths 	return 0;
590cd831bd7Sths     }
591cd831bd7Sths 
592c1f8fdc3SPaolo Bonzini     if (device && !verbose) {
593c1f8fdc3SPaolo Bonzini         int stderr_fd[2];
594c1f8fdc3SPaolo Bonzini         pid_t pid;
595c1f8fdc3SPaolo Bonzini         int ret;
596c1f8fdc3SPaolo Bonzini 
597fc19f8a0SPaolo Bonzini         if (qemu_pipe(stderr_fd) < 0) {
598c1f8fdc3SPaolo Bonzini             err(EXIT_FAILURE, "Error setting up communication pipe");
599c1f8fdc3SPaolo Bonzini         }
600c1f8fdc3SPaolo Bonzini 
601c1f8fdc3SPaolo Bonzini         /* Now daemonize, but keep a communication channel open to
602c1f8fdc3SPaolo Bonzini          * print errors and exit with the proper status code.
603c1f8fdc3SPaolo Bonzini          */
604c1f8fdc3SPaolo Bonzini         pid = fork();
605c1f8fdc3SPaolo Bonzini         if (pid == 0) {
606c1f8fdc3SPaolo Bonzini             close(stderr_fd[0]);
6079faf31b6SMichael Tokarev             ret = qemu_daemon(1, 0);
608c1f8fdc3SPaolo Bonzini 
609c1f8fdc3SPaolo Bonzini             /* Temporarily redirect stderr to the parent's pipe...  */
610c1f8fdc3SPaolo Bonzini             dup2(stderr_fd[1], STDERR_FILENO);
611fc19f8a0SPaolo Bonzini             if (ret < 0) {
612c1f8fdc3SPaolo Bonzini                 err(EXIT_FAILURE, "Failed to daemonize");
613c1f8fdc3SPaolo Bonzini             }
614c1f8fdc3SPaolo Bonzini 
615c1f8fdc3SPaolo Bonzini             /* ... close the descriptor we inherited and go on.  */
616c1f8fdc3SPaolo Bonzini             close(stderr_fd[1]);
617c1f8fdc3SPaolo Bonzini         } else {
618c1f8fdc3SPaolo Bonzini             bool errors = false;
619c1f8fdc3SPaolo Bonzini             char *buf;
620c1f8fdc3SPaolo Bonzini 
621c1f8fdc3SPaolo Bonzini             /* In the parent.  Print error messages from the child until
622c1f8fdc3SPaolo Bonzini              * it closes the pipe.
623c1f8fdc3SPaolo Bonzini              */
624c1f8fdc3SPaolo Bonzini             close(stderr_fd[1]);
625c1f8fdc3SPaolo Bonzini             buf = g_malloc(1024);
626c1f8fdc3SPaolo Bonzini             while ((ret = read(stderr_fd[0], buf, 1024)) > 0) {
627c1f8fdc3SPaolo Bonzini                 errors = true;
628c1f8fdc3SPaolo Bonzini                 ret = qemu_write_full(STDERR_FILENO, buf, ret);
629fc19f8a0SPaolo Bonzini                 if (ret < 0) {
630c1f8fdc3SPaolo Bonzini                     exit(EXIT_FAILURE);
631c1f8fdc3SPaolo Bonzini                 }
632c1f8fdc3SPaolo Bonzini             }
633fc19f8a0SPaolo Bonzini             if (ret < 0) {
634c1f8fdc3SPaolo Bonzini                 err(EXIT_FAILURE, "Cannot read from daemon");
635c1f8fdc3SPaolo Bonzini             }
636c1f8fdc3SPaolo Bonzini 
637c1f8fdc3SPaolo Bonzini             /* Usually the daemon should not print any message.
638c1f8fdc3SPaolo Bonzini              * Exit with zero status in that case.
639c1f8fdc3SPaolo Bonzini              */
640c1f8fdc3SPaolo Bonzini             exit(errors);
641c1f8fdc3SPaolo Bonzini         }
642c1f8fdc3SPaolo Bonzini     }
643c1f8fdc3SPaolo Bonzini 
644a6ac2313SPaolo Bonzini     if (device != NULL && sockpath == NULL) {
645b32f6c28SPaolo Bonzini         sockpath = g_malloc(128);
646b32f6c28SPaolo Bonzini         snprintf(sockpath, 128, SOCKET_PATH, basename(device));
647cd831bd7Sths     }
648cd831bd7Sths 
6497e7f4a0eSPaolo Bonzini     qemu_init_main_loop();
650802ddc37SPaolo Bonzini     bdrv_init();
651802ddc37SPaolo Bonzini     atexit(bdrv_close_all);
652802ddc37SPaolo Bonzini 
653e6b63677SDaniel P. Berrange     if (fmt) {
654e6b63677SDaniel P. Berrange         drv = bdrv_find_format(fmt);
655e6b63677SDaniel P. Berrange         if (!drv) {
656e6b63677SDaniel P. Berrange             errx(EXIT_FAILURE, "Unknown file format '%s'", fmt);
657e6b63677SDaniel P. Berrange         }
658e6b63677SDaniel P. Berrange     } else {
659e6b63677SDaniel P. Berrange         drv = NULL;
660e6b63677SDaniel P. Berrange     }
661e6b63677SDaniel P. Berrange 
66298522f63SKevin Wolf     bs = bdrv_new("hda", &error_abort);
66398522f63SKevin Wolf 
664802ddc37SPaolo Bonzini     srcpath = argv[optind];
665ddf5636dSMax Reitz     ret = bdrv_open(&bs, srcpath, NULL, NULL, flags, drv, &local_err);
666e6b63677SDaniel P. Berrange     if (ret < 0) {
667802ddc37SPaolo Bonzini         errno = -ret;
66834b5d2c6SMax Reitz         err(EXIT_FAILURE, "Failed to bdrv_open '%s': %s", argv[optind],
66934b5d2c6SMax Reitz             error_get_pretty(local_err));
670802ddc37SPaolo Bonzini     }
671802ddc37SPaolo Bonzini 
6728c116b0eSWenchao Xia     if (sn_opts) {
6738c116b0eSWenchao Xia         ret = bdrv_snapshot_load_tmp(bs,
6748c116b0eSWenchao Xia                                      qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID),
6758c116b0eSWenchao Xia                                      qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME),
6768c116b0eSWenchao Xia                                      &local_err);
6778c116b0eSWenchao Xia     } else if (sn_id_or_name) {
6788c116b0eSWenchao Xia         ret = bdrv_snapshot_load_tmp_by_id_or_name(bs, sn_id_or_name,
6798c116b0eSWenchao Xia                                                    &local_err);
6808c116b0eSWenchao Xia     }
6818c116b0eSWenchao Xia     if (ret < 0) {
6828c116b0eSWenchao Xia         errno = -ret;
6838c116b0eSWenchao Xia         err(EXIT_FAILURE,
6848c116b0eSWenchao Xia             "Failed to load snapshot: %s",
6858c116b0eSWenchao Xia             error_get_pretty(local_err));
6868c116b0eSWenchao Xia     }
6878c116b0eSWenchao Xia 
68838ceff04SPaolo Bonzini     fd_size = bdrv_getlength(bs);
689802ddc37SPaolo Bonzini 
690185b4338SPaolo Bonzini     if (partition != -1) {
691185b4338SPaolo Bonzini         ret = find_partition(bs, partition, &dev_offset, &fd_size);
692185b4338SPaolo Bonzini         if (ret < 0) {
693185b4338SPaolo Bonzini             errno = -ret;
694802ddc37SPaolo Bonzini             err(EXIT_FAILURE, "Could not find partition %d", partition);
695802ddc37SPaolo Bonzini         }
696185b4338SPaolo Bonzini     }
697802ddc37SPaolo Bonzini 
6987860a380SPaolo Bonzini     exp = nbd_export_new(bs, dev_offset, fd_size, nbdflags, nbd_export_closed);
6993b05a8e9Sths 
700b32f6c28SPaolo Bonzini     if (sockpath) {
701a61c6782SPaolo Bonzini         fd = unix_socket_incoming(sockpath);
702cd831bd7Sths     } else {
703a61c6782SPaolo Bonzini         fd = tcp_socket_incoming(bindto, port);
704cd831bd7Sths     }
705cd831bd7Sths 
706fc19f8a0SPaolo Bonzini     if (fd < 0) {
7077a5ca864Sbellard         return 1;
708a61c6782SPaolo Bonzini     }
709f1ef5555SPaolo Bonzini 
710f1ef5555SPaolo Bonzini     if (device) {
711f1ef5555SPaolo Bonzini         int ret;
712f1ef5555SPaolo Bonzini 
713a6ac2313SPaolo Bonzini         ret = pthread_create(&client_thread, NULL, nbd_client_thread, device);
714f1ef5555SPaolo Bonzini         if (ret != 0) {
715f1ef5555SPaolo Bonzini             errx(EXIT_FAILURE, "Failed to create client thread: %s",
716f1ef5555SPaolo Bonzini                  strerror(ret));
717f1ef5555SPaolo Bonzini         }
718f1ef5555SPaolo Bonzini     } else {
719f1ef5555SPaolo Bonzini         /* Shut up GCC warnings.  */
720f1ef5555SPaolo Bonzini         memset(&client_thread, 0, sizeof(client_thread));
721f1ef5555SPaolo Bonzini     }
722f1ef5555SPaolo Bonzini 
723a61c6782SPaolo Bonzini     qemu_set_fd_handler2(fd, nbd_can_accept, nbd_accept, NULL,
724a61c6782SPaolo Bonzini                          (void *)(uintptr_t)fd);
7257a5ca864Sbellard 
7269faf31b6SMichael Tokarev     /* now when the initialization is (almost) complete, chdir("/")
7279faf31b6SMichael Tokarev      * to free any busy filesystems */
7289faf31b6SMichael Tokarev     if (chdir("/") < 0) {
7299faf31b6SMichael Tokarev         err(EXIT_FAILURE, "Could not chdir to root directory");
7309faf31b6SMichael Tokarev     }
7319faf31b6SMichael Tokarev 
7327860a380SPaolo Bonzini     state = RUNNING;
7333b05a8e9Sths     do {
734a61c6782SPaolo Bonzini         main_loop_wait(false);
7357860a380SPaolo Bonzini         if (state == TERMINATE) {
7367860a380SPaolo Bonzini             state = TERMINATING;
737af49bbbeSPaolo Bonzini             nbd_export_close(exp);
7382c8d9f06SPaolo Bonzini             nbd_export_put(exp);
7397860a380SPaolo Bonzini             exp = NULL;
7407860a380SPaolo Bonzini         }
7417860a380SPaolo Bonzini     } while (state != TERMINATED);
7422c8d9f06SPaolo Bonzini 
7437860a380SPaolo Bonzini     bdrv_close(bs);
744b32f6c28SPaolo Bonzini     if (sockpath) {
745b32f6c28SPaolo Bonzini         unlink(sockpath);
746b32f6c28SPaolo Bonzini     }
7477a5ca864Sbellard 
7488c116b0eSWenchao Xia     if (sn_opts) {
7498c116b0eSWenchao Xia         qemu_opts_del(sn_opts);
7508c116b0eSWenchao Xia     }
7518c116b0eSWenchao Xia 
752a517e88bSPaolo Bonzini     if (device) {
753a517e88bSPaolo Bonzini         void *ret;
754a517e88bSPaolo Bonzini         pthread_join(client_thread, &ret);
755a517e88bSPaolo Bonzini         exit(ret != NULL);
756a517e88bSPaolo Bonzini     } else {
757a517e88bSPaolo Bonzini         exit(EXIT_SUCCESS);
758a517e88bSPaolo Bonzini     }
7597a5ca864Sbellard }
760