migration: add reporting of errors for outgoing migration
[qemu.git] / migration / tcp.c
1 /*
2 * QEMU live migration
3 *
4 * Copyright IBM, Corp. 2008
5 *
6 * Authors:
7 * Anthony Liguori <aliguori@us.ibm.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
18 #include "qemu-common.h"
19 #include "qemu/error-report.h"
20 #include "qemu/sockets.h"
21 #include "migration/migration.h"
22 #include "migration/qemu-file.h"
23 #include "block/block.h"
24 #include "qemu/main-loop.h"
25
26 //#define DEBUG_MIGRATION_TCP
27
28 #ifdef DEBUG_MIGRATION_TCP
29 #define DPRINTF(fmt, ...) \
30 do { printf("migration-tcp: " fmt, ## __VA_ARGS__); } while (0)
31 #else
32 #define DPRINTF(fmt, ...) \
33 do { } while (0)
34 #endif
35
36 static void tcp_wait_for_connect(int fd, Error *err, void *opaque)
37 {
38 MigrationState *s = opaque;
39
40 if (fd < 0) {
41 DPRINTF("migrate connect error: %s\n", error_get_pretty(err));
42 s->to_dst_file = NULL;
43 migrate_fd_error(s, err);
44 } else {
45 DPRINTF("migrate connect success\n");
46 s->to_dst_file = qemu_fopen_socket(fd, "wb");
47 migrate_fd_connect(s);
48 }
49 }
50
51 void tcp_start_outgoing_migration(MigrationState *s, const char *host_port, Error **errp)
52 {
53 inet_nonblocking_connect(host_port, tcp_wait_for_connect, s, errp);
54 }
55
56 static void tcp_accept_incoming_migration(void *opaque)
57 {
58 struct sockaddr_in addr;
59 socklen_t addrlen = sizeof(addr);
60 int s = (intptr_t)opaque;
61 QEMUFile *f;
62 int c;
63
64 do {
65 c = qemu_accept(s, (struct sockaddr *)&addr, &addrlen);
66 } while (c < 0 && errno == EINTR);
67 qemu_set_fd_handler(s, NULL, NULL, NULL);
68 closesocket(s);
69
70 DPRINTF("accepted migration\n");
71
72 if (c < 0) {
73 error_report("could not accept migration connection (%s)",
74 strerror(errno));
75 return;
76 }
77
78 f = qemu_fopen_socket(c, "rb");
79 if (f == NULL) {
80 error_report("could not qemu_fopen socket");
81 goto out;
82 }
83
84 process_incoming_migration(f);
85 return;
86
87 out:
88 closesocket(c);
89 }
90
91 void tcp_start_incoming_migration(const char *host_port, Error **errp)
92 {
93 int s;
94
95 s = inet_listen(host_port, NULL, 256, SOCK_STREAM, 0, errp);
96 if (s < 0) {
97 return;
98 }
99
100 qemu_set_fd_handler(s, tcp_accept_incoming_migration, NULL,
101 (void *)(intptr_t)s);
102 }