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[qemu.git] / migration-unix.c
CommitLineData
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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
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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.
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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"
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21
22//#define DEBUG_MIGRATION_UNIX
23
24#ifdef DEBUG_MIGRATION_UNIX
d0f2c4c6 25#define DPRINTF(fmt, ...) \
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26 do { printf("migration-unix: " fmt, ## __VA_ARGS__); } while (0)
27#else
d0f2c4c6 28#define DPRINTF(fmt, ...) \
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29 do { } while (0)
30#endif
31
22f00a44 32static int unix_errno(MigrationState *s)
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33{
34 return errno;
35}
36
22f00a44 37static int unix_write(MigrationState *s, const void * buf, size_t size)
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38{
39 return write(s->fd, buf, size);
40}
41
22f00a44 42static int unix_close(MigrationState *s)
4951f65b 43{
8160bfbc 44 int r = 0;
d0f2c4c6 45 DPRINTF("unix_close\n");
6c360136
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46 if (close(s->fd) < 0) {
47 r = -errno;
4951f65b 48 }
8160bfbc 49 return r;
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50}
51
e08c95ce 52static void unix_wait_for_connect(int fd, void *opaque)
4951f65b 53{
22f00a44 54 MigrationState *s = opaque;
4951f65b 55
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56 if (fd < 0) {
57 DPRINTF("migrate connect error\n");
58 s->fd = -1;
4951f65b 59 migrate_fd_error(s);
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60 } else {
61 DPRINTF("migrate connect success\n");
62 s->fd = fd;
dd217b87 63 socket_set_block(s->fd);
4951f65b 64 migrate_fd_connect(s);
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65 }
66}
67
f37afb5a 68void unix_start_outgoing_migration(MigrationState *s, const char *path, Error **errp)
4951f65b 69{
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70 s->get_error = unix_errno;
71 s->write = unix_write;
72 s->close = unix_close;
4951f65b 73
f37afb5a 74 s->fd = unix_nonblocking_connect(path, unix_wait_for_connect, s, errp);
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75}
76
77static void unix_accept_incoming_migration(void *opaque)
78{
79 struct sockaddr_un addr;
80 socklen_t addrlen = sizeof(addr);
e0efb993 81 int s = (intptr_t)opaque;
4951f65b 82 QEMUFile *f;
511c0231 83 int c;
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84
85 do {
40ff6d7e 86 c = qemu_accept(s, (struct sockaddr *)&addr, &addrlen);
efab4718 87 } while (c == -1 && errno == EINTR);
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88 qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL);
89 close(s);
4951f65b 90
d0f2c4c6 91 DPRINTF("accepted migration\n");
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92
93 if (c == -1) {
94 fprintf(stderr, "could not accept migration connection\n");
a6ef2909 95 goto out;
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96 }
97
98 f = qemu_fopen_socket(c);
99 if (f == NULL) {
100 fprintf(stderr, "could not qemu_fopen socket\n");
101 goto out;
102 }
103
511c0231 104 process_incoming_migration(f);
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105 return;
106
4951f65b 107out:
ee86c61f 108 close(c);
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109}
110
43eaae28 111void unix_start_incoming_migration(const char *path, Error **errp)
4951f65b 112{
ee86c61f 113 int s;
4951f65b 114
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115 s = unix_listen(path, NULL, 0, errp);
116 if (s < 0) {
43eaae28 117 return;
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118 }
119
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120 qemu_set_fd_handler2(s, NULL, unix_accept_incoming_migration, NULL,
121 (void *)(intptr_t)s);
4951f65b 122}