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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_socket.h" | |
20 | #include "migration.h" | |
21 | #include "qemu-char.h" | |
22 | #include "buffered_file.h" | |
23 | #include "block.h" | |
24 | #include <sys/types.h> | |
25 | #include <sys/wait.h> | |
26 | ||
27 | //#define DEBUG_MIGRATION_EXEC | |
28 | ||
29 | #ifdef DEBUG_MIGRATION_EXEC | |
30 | #define DPRINTF(fmt, ...) \ | |
31 | do { printf("migration-exec: " fmt, ## __VA_ARGS__); } while (0) | |
32 | #else | |
33 | #define DPRINTF(fmt, ...) \ | |
34 | do { } while (0) | |
35 | #endif | |
36 | ||
37 | static int file_errno(MigrationState *s) | |
38 | { | |
39 | return errno; | |
40 | } | |
41 | ||
42 | static int file_write(MigrationState *s, const void * buf, size_t size) | |
43 | { | |
44 | return write(s->fd, buf, size); | |
45 | } | |
46 | ||
47 | static int exec_close(MigrationState *s) | |
48 | { | |
49 | int ret = 0; | |
50 | DPRINTF("exec_close\n"); | |
51 | if (s->opaque) { | |
52 | ret = qemu_fclose(s->opaque); | |
53 | s->opaque = NULL; | |
54 | s->fd = -1; | |
55 | if (ret >= 0 && !(WIFEXITED(ret) && WEXITSTATUS(ret) == 0)) { | |
56 | /* close succeeded, but non-zero exit code: */ | |
57 | ret = -EIO; /* fake errno value */ | |
58 | } | |
59 | } | |
60 | return ret; | |
61 | } | |
62 | ||
63 | int exec_start_outgoing_migration(MigrationState *s, const char *command) | |
64 | { | |
65 | FILE *f; | |
66 | ||
67 | f = popen(command, "w"); | |
68 | if (f == NULL) { | |
69 | DPRINTF("Unable to popen exec target\n"); | |
70 | goto err_after_popen; | |
71 | } | |
72 | ||
73 | s->fd = fileno(f); | |
74 | if (s->fd == -1) { | |
75 | DPRINTF("Unable to retrieve file descriptor for popen'd handle\n"); | |
76 | goto err_after_open; | |
77 | } | |
78 | ||
79 | socket_set_nonblock(s->fd); | |
80 | ||
81 | s->opaque = qemu_popen(f, "w"); | |
82 | ||
83 | s->close = exec_close; | |
84 | s->get_error = file_errno; | |
85 | s->write = file_write; | |
86 | ||
87 | migrate_fd_connect(s); | |
88 | return 0; | |
89 | ||
90 | err_after_open: | |
91 | pclose(f); | |
92 | err_after_popen: | |
93 | return -1; | |
94 | } | |
95 | ||
96 | static void exec_accept_incoming_migration(void *opaque) | |
97 | { | |
98 | QEMUFile *f = opaque; | |
99 | ||
100 | process_incoming_migration(f); | |
101 | qemu_set_fd_handler2(qemu_stdio_fd(f), NULL, NULL, NULL, NULL); | |
102 | qemu_fclose(f); | |
103 | } | |
104 | ||
105 | int exec_start_incoming_migration(const char *command) | |
106 | { | |
107 | QEMUFile *f; | |
108 | ||
109 | DPRINTF("Attempting to start an incoming migration\n"); | |
110 | f = qemu_popen_cmd(command, "r"); | |
111 | if(f == NULL) { | |
112 | DPRINTF("Unable to apply qemu wrapper to popen file\n"); | |
113 | return -errno; | |
114 | } | |
115 | ||
116 | qemu_set_fd_handler2(qemu_stdio_fd(f), NULL, | |
117 | exec_accept_incoming_migration, NULL, f); | |
118 | ||
119 | return 0; | |
120 | } |