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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" | |
17 | #include "qemu_socket.h" | |
18 | #include "migration.h" | |
19 | #include "qemu-char.h" | |
4951f65b CL |
20 | #include "buffered_file.h" |
21 | #include "block.h" | |
22 | ||
23 | //#define DEBUG_MIGRATION_UNIX | |
24 | ||
25 | #ifdef DEBUG_MIGRATION_UNIX | |
d0f2c4c6 | 26 | #define DPRINTF(fmt, ...) \ |
4951f65b CL |
27 | do { printf("migration-unix: " fmt, ## __VA_ARGS__); } while (0) |
28 | #else | |
d0f2c4c6 | 29 | #define DPRINTF(fmt, ...) \ |
4951f65b CL |
30 | do { } while (0) |
31 | #endif | |
32 | ||
22f00a44 | 33 | static int unix_errno(MigrationState *s) |
4951f65b CL |
34 | { |
35 | return errno; | |
36 | } | |
37 | ||
22f00a44 | 38 | static int unix_write(MigrationState *s, const void * buf, size_t size) |
4951f65b CL |
39 | { |
40 | return write(s->fd, buf, size); | |
41 | } | |
42 | ||
22f00a44 | 43 | static int unix_close(MigrationState *s) |
4951f65b | 44 | { |
8160bfbc | 45 | int r = 0; |
d0f2c4c6 | 46 | DPRINTF("unix_close\n"); |
4951f65b | 47 | if (s->fd != -1) { |
8160bfbc EH |
48 | if (close(s->fd) < 0) { |
49 | r = -errno; | |
50 | } | |
4951f65b CL |
51 | s->fd = -1; |
52 | } | |
8160bfbc | 53 | return r; |
4951f65b CL |
54 | } |
55 | ||
e08c95ce | 56 | static void unix_wait_for_connect(int fd, void *opaque) |
4951f65b | 57 | { |
22f00a44 | 58 | MigrationState *s = opaque; |
4951f65b | 59 | |
e08c95ce PB |
60 | if (fd < 0) { |
61 | DPRINTF("migrate connect error\n"); | |
62 | s->fd = -1; | |
4951f65b | 63 | migrate_fd_error(s); |
e08c95ce PB |
64 | } else { |
65 | DPRINTF("migrate connect success\n"); | |
66 | s->fd = fd; | |
4951f65b | 67 | migrate_fd_connect(s); |
4951f65b CL |
68 | } |
69 | } | |
70 | ||
f37afb5a | 71 | void unix_start_outgoing_migration(MigrationState *s, const char *path, Error **errp) |
4951f65b | 72 | { |
4951f65b CL |
73 | s->get_error = unix_errno; |
74 | s->write = unix_write; | |
75 | s->close = unix_close; | |
4951f65b | 76 | |
f37afb5a | 77 | s->fd = unix_nonblocking_connect(path, unix_wait_for_connect, s, errp); |
4951f65b CL |
78 | } |
79 | ||
80 | static void unix_accept_incoming_migration(void *opaque) | |
81 | { | |
82 | struct sockaddr_un addr; | |
83 | socklen_t addrlen = sizeof(addr); | |
e0efb993 | 84 | int s = (intptr_t)opaque; |
4951f65b | 85 | QEMUFile *f; |
511c0231 | 86 | int c; |
4951f65b CL |
87 | |
88 | do { | |
40ff6d7e | 89 | c = qemu_accept(s, (struct sockaddr *)&addr, &addrlen); |
efab4718 | 90 | } while (c == -1 && errno == EINTR); |
4951f65b | 91 | |
d0f2c4c6 | 92 | DPRINTF("accepted migration\n"); |
4951f65b CL |
93 | |
94 | if (c == -1) { | |
95 | fprintf(stderr, "could not accept migration connection\n"); | |
ee86c61f | 96 | goto out2; |
4951f65b CL |
97 | } |
98 | ||
99 | f = qemu_fopen_socket(c); | |
100 | if (f == NULL) { | |
101 | fprintf(stderr, "could not qemu_fopen socket\n"); | |
102 | goto out; | |
103 | } | |
104 | ||
511c0231 | 105 | process_incoming_migration(f); |
4951f65b CL |
106 | qemu_fclose(f); |
107 | out: | |
ee86c61f JQ |
108 | close(c); |
109 | out2: | |
cfaf6d36 JQ |
110 | qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL); |
111 | close(s); | |
4951f65b CL |
112 | } |
113 | ||
43eaae28 | 114 | void unix_start_incoming_migration(const char *path, Error **errp) |
4951f65b | 115 | { |
ee86c61f | 116 | int s; |
4951f65b | 117 | |
e08c95ce PB |
118 | s = unix_listen(path, NULL, 0, errp); |
119 | if (s < 0) { | |
43eaae28 | 120 | return; |
4951f65b CL |
121 | } |
122 | ||
ee86c61f JQ |
123 | qemu_set_fd_handler2(s, NULL, unix_accept_incoming_migration, NULL, |
124 | (void *)(intptr_t)s); | |
4951f65b | 125 | } |