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1 /*
2 * QEMU live migration
3 *
4 * Copyright IBM, Corp. 2008
5 * Copyright Dell MessageOne 2008
6 *
7 * Authors:
8 * Anthony Liguori <aliguori@us.ibm.com>
9 * Charles Duffy <charles_duffy@messageone.com>
10 *
11 * This work is licensed under the terms of the GNU GPL, version 2. See
12 * the COPYING file in the top-level directory.
13 *
14 * Contributions after 2012-01-13 are licensed under the terms of the
15 * GNU GPL, version 2 or (at your option) any later version.
16 */
17
18 #include "qemu-common.h"
19 #include "qemu/sockets.h"
20 #include "migration/migration.h"
21 #include "migration/qemu-file.h"
22 #include "block/block.h"
23 #include <sys/types.h>
24 #include <sys/wait.h>
25
26 //#define DEBUG_MIGRATION_EXEC
27
28 #ifdef DEBUG_MIGRATION_EXEC
29 #define DPRINTF(fmt, ...) \
30 do { printf("migration-exec: " fmt, ## __VA_ARGS__); } while (0)
31 #else
32 #define DPRINTF(fmt, ...) \
33 do { } while (0)
34 #endif
35
36 static int file_errno(MigrationState *s)
37 {
38 return errno;
39 }
40
41 static int file_write(MigrationState *s, const void * buf, size_t size)
42 {
43 return write(s->fd, buf, size);
44 }
45
46 static int exec_close(MigrationState *s)
47 {
48 int ret = 0;
49 DPRINTF("exec_close\n");
50 ret = qemu_fclose(s->opaque);
51 s->opaque = NULL;
52 s->fd = -1;
53 if (ret >= 0 && !(WIFEXITED(ret) && WEXITSTATUS(ret) == 0)) {
54 /* close succeeded, but non-zero exit code: */
55 ret = -EIO; /* fake errno value */
56 }
57 return ret;
58 }
59
60 void exec_start_outgoing_migration(MigrationState *s, const char *command, Error **errp)
61 {
62 FILE *f;
63
64 f = popen(command, "w");
65 if (f == NULL) {
66 error_setg_errno(errp, errno, "failed to popen the migration target");
67 return;
68 }
69
70 s->fd = fileno(f);
71 assert(s->fd != -1);
72
73 s->opaque = qemu_popen(f, "w");
74
75 s->close = exec_close;
76 s->get_error = file_errno;
77 s->write = file_write;
78
79 migrate_fd_connect(s);
80 }
81
82 static void exec_accept_incoming_migration(void *opaque)
83 {
84 QEMUFile *f = opaque;
85
86 qemu_set_fd_handler2(qemu_get_fd(f), NULL, NULL, NULL, NULL);
87 process_incoming_migration(f);
88 }
89
90 void exec_start_incoming_migration(const char *command, Error **errp)
91 {
92 QEMUFile *f;
93
94 DPRINTF("Attempting to start an incoming migration\n");
95 f = qemu_popen_cmd(command, "r");
96 if(f == NULL) {
97 error_setg_errno(errp, errno, "failed to popen the migration source");
98 return;
99 }
100
101 qemu_set_fd_handler2(qemu_get_fd(f), NULL,
102 exec_accept_incoming_migration, NULL, f);
103 }