spice-qemu-char: keep a list of spice chardev
[qemu/ar7.git] / migration-unix.c
blobdba72b4a543d9283ab756403cfef361273dd7692
1 /*
2 * QEMU live migration via Unix Domain Sockets
4 * Copyright Red Hat, Inc. 2009
6 * Authors:
7 * Chris Lalancette <clalance@redhat.com>
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
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.
16 #include "qemu-common.h"
17 #include "qemu_socket.h"
18 #include "migration.h"
19 #include "qemu-char.h"
20 #include "buffered_file.h"
21 #include "block.h"
23 //#define DEBUG_MIGRATION_UNIX
25 #ifdef DEBUG_MIGRATION_UNIX
26 #define DPRINTF(fmt, ...) \
27 do { printf("migration-unix: " fmt, ## __VA_ARGS__); } while (0)
28 #else
29 #define DPRINTF(fmt, ...) \
30 do { } while (0)
31 #endif
33 static int unix_errno(MigrationState *s)
35 return errno;
38 static int unix_write(MigrationState *s, const void * buf, size_t size)
40 return write(s->fd, buf, size);
43 static int unix_close(MigrationState *s)
45 int r = 0;
46 DPRINTF("unix_close\n");
47 if (close(s->fd) < 0) {
48 r = -errno;
50 return r;
53 static void unix_wait_for_connect(int fd, void *opaque)
55 MigrationState *s = opaque;
57 if (fd < 0) {
58 DPRINTF("migrate connect error\n");
59 s->fd = -1;
60 migrate_fd_error(s);
61 } else {
62 DPRINTF("migrate connect success\n");
63 s->fd = fd;
64 migrate_fd_connect(s);
68 void unix_start_outgoing_migration(MigrationState *s, const char *path, Error **errp)
70 s->get_error = unix_errno;
71 s->write = unix_write;
72 s->close = unix_close;
74 s->fd = unix_nonblocking_connect(path, unix_wait_for_connect, s, errp);
77 static void unix_accept_incoming_migration(void *opaque)
79 struct sockaddr_un addr;
80 socklen_t addrlen = sizeof(addr);
81 int s = (intptr_t)opaque;
82 QEMUFile *f;
83 int c;
85 do {
86 c = qemu_accept(s, (struct sockaddr *)&addr, &addrlen);
87 } while (c == -1 && errno == EINTR);
88 qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL);
89 close(s);
91 DPRINTF("accepted migration\n");
93 if (c == -1) {
94 fprintf(stderr, "could not accept migration connection\n");
95 goto out;
98 f = qemu_fopen_socket(c);
99 if (f == NULL) {
100 fprintf(stderr, "could not qemu_fopen socket\n");
101 goto out;
104 process_incoming_migration(f);
105 return;
107 out:
108 close(c);
111 void unix_start_incoming_migration(const char *path, Error **errp)
113 int s;
115 s = unix_listen(path, NULL, 0, errp);
116 if (s < 0) {
117 return;
120 qemu_set_fd_handler2(s, NULL, unix_accept_incoming_migration, NULL,
121 (void *)(intptr_t)s);