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Commit | Line | Data |
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4951f65b CL |
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 | * | |
6b620ca3 PB |
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. | |
4951f65b CL |
14 | */ |
15 | ||
16 | #include "qemu-common.h" | |
1de7afc9 | 17 | #include "qemu/sockets.h" |
caf71f86 | 18 | #include "migration/migration.h" |
557ec5a0 | 19 | #include "migration/qemu-file.h" |
737e150e | 20 | #include "block/block.h" |
4951f65b CL |
21 | |
22 | //#define DEBUG_MIGRATION_UNIX | |
23 | ||
24 | #ifdef DEBUG_MIGRATION_UNIX | |
d0f2c4c6 | 25 | #define DPRINTF(fmt, ...) \ |
4951f65b CL |
26 | do { printf("migration-unix: " fmt, ## __VA_ARGS__); } while (0) |
27 | #else | |
d0f2c4c6 | 28 | #define DPRINTF(fmt, ...) \ |
4951f65b CL |
29 | do { } while (0) |
30 | #endif | |
31 | ||
22f00a44 | 32 | static int unix_errno(MigrationState *s) |
4951f65b CL |
33 | { |
34 | return errno; | |
35 | } | |
36 | ||
22f00a44 | 37 | static int unix_write(MigrationState *s, const void * buf, size_t size) |
4951f65b CL |
38 | { |
39 | return write(s->fd, buf, size); | |
40 | } | |
41 | ||
e08c95ce | 42 | static void unix_wait_for_connect(int fd, void *opaque) |
4951f65b | 43 | { |
22f00a44 | 44 | MigrationState *s = opaque; |
4951f65b | 45 | |
e08c95ce PB |
46 | if (fd < 0) { |
47 | DPRINTF("migrate connect error\n"); | |
f8bbc128 | 48 | s->migration_file = NULL; |
4951f65b | 49 | migrate_fd_error(s); |
e08c95ce PB |
50 | } else { |
51 | DPRINTF("migrate connect success\n"); | |
f8bbc128 | 52 | s->migration_file = qemu_fopen_socket(fd, "wb"); |
4951f65b | 53 | migrate_fd_connect(s); |
4951f65b CL |
54 | } |
55 | } | |
56 | ||
f37afb5a | 57 | void unix_start_outgoing_migration(MigrationState *s, const char *path, Error **errp) |
4951f65b | 58 | { |
4951f65b CL |
59 | s->get_error = unix_errno; |
60 | s->write = unix_write; | |
f8bbc128 | 61 | unix_nonblocking_connect(path, unix_wait_for_connect, s, errp); |
4951f65b CL |
62 | } |
63 | ||
64 | static void unix_accept_incoming_migration(void *opaque) | |
65 | { | |
66 | struct sockaddr_un addr; | |
67 | socklen_t addrlen = sizeof(addr); | |
e0efb993 | 68 | int s = (intptr_t)opaque; |
4951f65b | 69 | QEMUFile *f; |
511c0231 | 70 | int c; |
4951f65b CL |
71 | |
72 | do { | |
40ff6d7e | 73 | c = qemu_accept(s, (struct sockaddr *)&addr, &addrlen); |
efab4718 | 74 | } while (c == -1 && errno == EINTR); |
a6ef2909 PB |
75 | qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL); |
76 | close(s); | |
4951f65b | 77 | |
d0f2c4c6 | 78 | DPRINTF("accepted migration\n"); |
4951f65b CL |
79 | |
80 | if (c == -1) { | |
81 | fprintf(stderr, "could not accept migration connection\n"); | |
a6ef2909 | 82 | goto out; |
4951f65b CL |
83 | } |
84 | ||
0cc3f3cc | 85 | f = qemu_fopen_socket(c, "rb"); |
4951f65b CL |
86 | if (f == NULL) { |
87 | fprintf(stderr, "could not qemu_fopen socket\n"); | |
88 | goto out; | |
89 | } | |
90 | ||
511c0231 | 91 | process_incoming_migration(f); |
ab52a824 PB |
92 | return; |
93 | ||
4951f65b | 94 | out: |
ee86c61f | 95 | close(c); |
4951f65b CL |
96 | } |
97 | ||
43eaae28 | 98 | void unix_start_incoming_migration(const char *path, Error **errp) |
4951f65b | 99 | { |
ee86c61f | 100 | int s; |
4951f65b | 101 | |
e08c95ce PB |
102 | s = unix_listen(path, NULL, 0, errp); |
103 | if (s < 0) { | |
43eaae28 | 104 | return; |
4951f65b CL |
105 | } |
106 | ||
ee86c61f JQ |
107 | qemu_set_fd_handler2(s, NULL, unix_accept_incoming_migration, NULL, |
108 | (void *)(intptr_t)s); | |
4951f65b | 109 | } |