trap signals for "-serial mon:stdio"
[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 "migration/migration.h"
19 #include "migration/qemu-file.h"
20 #include "block/block.h"
21
22 //#define DEBUG_MIGRATION_UNIX
23
24 #ifdef DEBUG_MIGRATION_UNIX
25 #define DPRINTF(fmt, ...) \
26 do { printf("migration-unix: " fmt, ## __VA_ARGS__); } while (0)
27 #else
28 #define DPRINTF(fmt, ...) \
29 do { } while (0)
30 #endif
31
32 static void unix_wait_for_connect(int fd, void *opaque)
33 {
34 MigrationState *s = opaque;
35
36 if (fd < 0) {
37 DPRINTF("migrate connect error\n");
38 s->file = NULL;
39 migrate_fd_error(s);
40 } else {
41 DPRINTF("migrate connect success\n");
42 s->file = qemu_fopen_socket(fd, "wb");
43 migrate_fd_connect(s);
44 }
45 }
46
47 void unix_start_outgoing_migration(MigrationState *s, const char *path, Error **errp)
48 {
49 unix_nonblocking_connect(path, unix_wait_for_connect, s, errp);
50 }
51
52 static void unix_accept_incoming_migration(void *opaque)
53 {
54 struct sockaddr_un addr;
55 socklen_t addrlen = sizeof(addr);
56 int s = (intptr_t)opaque;
57 QEMUFile *f;
58 int c;
59
60 do {
61 c = qemu_accept(s, (struct sockaddr *)&addr, &addrlen);
62 } while (c == -1 && errno == EINTR);
63 qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL);
64 close(s);
65
66 DPRINTF("accepted migration\n");
67
68 if (c == -1) {
69 fprintf(stderr, "could not accept migration connection\n");
70 goto out;
71 }
72
73 f = qemu_fopen_socket(c, "rb");
74 if (f == NULL) {
75 fprintf(stderr, "could not qemu_fopen socket\n");
76 goto out;
77 }
78
79 process_incoming_migration(f);
80 return;
81
82 out:
83 close(c);
84 }
85
86 void unix_start_incoming_migration(const char *path, Error **errp)
87 {
88 int s;
89
90 s = unix_listen(path, NULL, 0, errp);
91 if (s < 0) {
92 return;
93 }
94
95 qemu_set_fd_handler2(s, NULL, unix_accept_incoming_migration, NULL,
96 (void *)(intptr_t)s);
97 }