vmxnet3: Use common MAC address tracing macros
[qemu.git] / migration / fd.c
1 /*
2 * QEMU live migration via generic fd
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 *
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.
14 */
15
16 #include "qemu/osdep.h"
17 #include "qapi/error.h"
18 #include "qemu-common.h"
19 #include "qemu/main-loop.h"
20 #include "qemu/sockets.h"
21 #include "migration/migration.h"
22 #include "monitor/monitor.h"
23 #include "migration/qemu-file.h"
24 #include "block/block.h"
25
26 //#define DEBUG_MIGRATION_FD
27
28 #ifdef DEBUG_MIGRATION_FD
29 #define DPRINTF(fmt, ...) \
30 do { printf("migration-fd: " fmt, ## __VA_ARGS__); } while (0)
31 #else
32 #define DPRINTF(fmt, ...) \
33 do { } while (0)
34 #endif
35
36 static bool fd_is_socket(int fd)
37 {
38 struct stat stat;
39 int ret = fstat(fd, &stat);
40 if (ret == -1) {
41 /* When in doubt say no */
42 return false;
43 }
44 return S_ISSOCK(stat.st_mode);
45 }
46
47 void fd_start_outgoing_migration(MigrationState *s, const char *fdname, Error **errp)
48 {
49 int fd = monitor_get_fd(cur_mon, fdname, errp);
50 if (fd == -1) {
51 return;
52 }
53
54 if (fd_is_socket(fd)) {
55 s->to_dst_file = qemu_fopen_socket(fd, "wb");
56 } else {
57 s->to_dst_file = qemu_fdopen(fd, "wb");
58 }
59
60 migrate_fd_connect(s);
61 }
62
63 static void fd_accept_incoming_migration(void *opaque)
64 {
65 QEMUFile *f = opaque;
66
67 qemu_set_fd_handler(qemu_get_fd(f), NULL, NULL, NULL);
68 process_incoming_migration(f);
69 }
70
71 void fd_start_incoming_migration(const char *infd, Error **errp)
72 {
73 int fd;
74 QEMUFile *f;
75
76 DPRINTF("Attempting to start an incoming migration via fd\n");
77
78 fd = strtol(infd, NULL, 0);
79 if (fd_is_socket(fd)) {
80 f = qemu_fopen_socket(fd, "rb");
81 } else {
82 f = qemu_fdopen(fd, "rb");
83 }
84 if(f == NULL) {
85 error_setg_errno(errp, errno, "failed to open the source descriptor");
86 return;
87 }
88
89 qemu_set_fd_handler(fd, fd_accept_incoming_migration, NULL, f);
90 }