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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 | ||
e08c95ce | 71 | int unix_start_outgoing_migration(MigrationState *s, const char *path, Error **errp) |
4951f65b | 72 | { |
e08c95ce | 73 | Error *local_err = NULL; |
4951f65b | 74 | |
4951f65b CL |
75 | s->get_error = unix_errno; |
76 | s->write = unix_write; | |
77 | s->close = unix_close; | |
4951f65b | 78 | |
e08c95ce PB |
79 | s->fd = unix_nonblocking_connect(path, unix_wait_for_connect, s, &local_err); |
80 | if (local_err != NULL) { | |
81 | error_propagate(errp, local_err); | |
82 | return -1; | |
2dd650e5 | 83 | } |
07af4452 | 84 | return 0; |
4951f65b CL |
85 | } |
86 | ||
87 | static void unix_accept_incoming_migration(void *opaque) | |
88 | { | |
89 | struct sockaddr_un addr; | |
90 | socklen_t addrlen = sizeof(addr); | |
e0efb993 | 91 | int s = (intptr_t)opaque; |
4951f65b | 92 | QEMUFile *f; |
511c0231 | 93 | int c; |
4951f65b CL |
94 | |
95 | do { | |
40ff6d7e | 96 | c = qemu_accept(s, (struct sockaddr *)&addr, &addrlen); |
efab4718 | 97 | } while (c == -1 && errno == EINTR); |
4951f65b | 98 | |
d0f2c4c6 | 99 | DPRINTF("accepted migration\n"); |
4951f65b CL |
100 | |
101 | if (c == -1) { | |
102 | fprintf(stderr, "could not accept migration connection\n"); | |
ee86c61f | 103 | goto out2; |
4951f65b CL |
104 | } |
105 | ||
106 | f = qemu_fopen_socket(c); | |
107 | if (f == NULL) { | |
108 | fprintf(stderr, "could not qemu_fopen socket\n"); | |
109 | goto out; | |
110 | } | |
111 | ||
511c0231 | 112 | process_incoming_migration(f); |
4951f65b CL |
113 | qemu_fclose(f); |
114 | out: | |
ee86c61f JQ |
115 | close(c); |
116 | out2: | |
cfaf6d36 JQ |
117 | qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL); |
118 | close(s); | |
4951f65b CL |
119 | } |
120 | ||
e08c95ce | 121 | int unix_start_incoming_migration(const char *path, Error **errp) |
4951f65b | 122 | { |
ee86c61f | 123 | int s; |
4951f65b | 124 | |
e08c95ce PB |
125 | s = unix_listen(path, NULL, 0, errp); |
126 | if (s < 0) { | |
127 | return -1; | |
4951f65b CL |
128 | } |
129 | ||
ee86c61f JQ |
130 | qemu_set_fd_handler2(s, NULL, unix_accept_incoming_migration, NULL, |
131 | (void *)(intptr_t)s); | |
4951f65b | 132 | return 0; |
4951f65b | 133 | } |