Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging
[qemu.git] / migration-unix.c
1 /*
2 * QEMU live migration via Unix Domain Sockets
3 *
4 * Copyright Red Hat, Inc. 2009
5 *
6 * Authors:
7 * Chris Lalancette <clalance@redhat.com>
8 *
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
11 *
12 * Contributions after 2012-01-13 are licensed under the terms of the
13 * GNU GPL, version 2 or (at your option) any later version.
14 */
15
16 #include "qemu-common.h"
17 #include "qemu/sockets.h"
18 #include "qemu/main-loop.h"
19 #include "migration/migration.h"
20 #include "migration/qemu-file.h"
21 #include "block/block.h"
22
23 //#define DEBUG_MIGRATION_UNIX
24
25 #ifdef DEBUG_MIGRATION_UNIX
26 #define DPRINTF(fmt, ...) \
27 do { printf("migration-unix: " fmt, ## __VA_ARGS__); } while (0)
28 #else
29 #define DPRINTF(fmt, ...) \
30 do { } while (0)
31 #endif
32
33 static void unix_wait_for_connect(int fd, void *opaque)
34 {
35 MigrationState *s = opaque;
36
37 if (fd < 0) {
38 DPRINTF("migrate connect error\n");
39 s->file = NULL;
40 migrate_fd_error(s);
41 } else {
42 DPRINTF("migrate connect success\n");
43 s->file = qemu_fopen_socket(fd, "wb");
44 migrate_fd_connect(s);
45 }
46 }
47
48 void unix_start_outgoing_migration(MigrationState *s, const char *path, Error **errp)
49 {
50 unix_nonblocking_connect(path, unix_wait_for_connect, s, errp);
51 }
52
53 static void unix_accept_incoming_migration(void *opaque)
54 {
55 struct sockaddr_un addr;
56 socklen_t addrlen = sizeof(addr);
57 int s = (intptr_t)opaque;
58 QEMUFile *f;
59 int c;
60
61 do {
62 c = qemu_accept(s, (struct sockaddr *)&addr, &addrlen);
63 } while (c == -1 && errno == EINTR);
64 qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL);
65 close(s);
66
67 DPRINTF("accepted migration\n");
68
69 if (c == -1) {
70 fprintf(stderr, "could not accept migration connection\n");
71 goto out;
72 }
73
74 f = qemu_fopen_socket(c, "rb");
75 if (f == NULL) {
76 fprintf(stderr, "could not qemu_fopen socket\n");
77 goto out;
78 }
79
80 process_incoming_migration(f);
81 return;
82
83 out:
84 close(c);
85 }
86
87 void unix_start_incoming_migration(const char *path, Error **errp)
88 {
89 int s;
90
91 s = unix_listen(path, NULL, 0, errp);
92 if (s < 0) {
93 return;
94 }
95
96 qemu_set_fd_handler2(s, NULL, unix_accept_incoming_migration, NULL,
97 (void *)(intptr_t)s);
98 }