migration-exec.c 2.5 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
11
12
13
/*
 * QEMU live migration
 *
 * Copyright IBM, Corp. 2008
 * Copyright Dell MessageOne 2008
 *
 * Authors:
 *  Anthony Liguori   <aliguori@us.ibm.com>
 *  Charles Duffy     <charles_duffy@messageone.com>
 *
 * This work is licensed under the terms of the GNU GPL, version 2.  See
 * the COPYING file in the top-level directory.
 *
14
15
 * Contributions after 2012-01-13 are licensed under the terms of the
 * GNU GPL, version 2 or (at your option) any later version.
16
17
18
19
20
21
22
23
 */

#include "qemu-common.h"
#include "qemu_socket.h"
#include "migration.h"
#include "qemu-char.h"
#include "buffered_file.h"
#include "block.h"
24
25
#include <sys/types.h>
#include <sys/wait.h>
26
27
28
29

//#define DEBUG_MIGRATION_EXEC

#ifdef DEBUG_MIGRATION_EXEC
malc's avatar
malc committed
30
#define DPRINTF(fmt, ...) \
31
32
    do { printf("migration-exec: " fmt, ## __VA_ARGS__); } while (0)
#else
malc's avatar
malc committed
33
#define DPRINTF(fmt, ...) \
34
35
36
    do { } while (0)
#endif

37
static int file_errno(MigrationState *s)
38
39
40
41
{
    return errno;
}

42
static int file_write(MigrationState *s, const void * buf, size_t size)
43
44
45
46
{
    return write(s->fd, buf, size);
}

47
static int exec_close(MigrationState *s)
48
{
49
    int ret = 0;
malc's avatar
malc committed
50
    DPRINTF("exec_close\n");
51
    if (s->opaque) {
52
        ret = qemu_fclose(s->opaque);
53
54
        s->opaque = NULL;
        s->fd = -1;
55
56
57
        if (ret >= 0 && !(WIFEXITED(ret) && WEXITSTATUS(ret) == 0)) {
            /* close succeeded, but non-zero exit code: */
            ret = -EIO; /* fake errno value */
58
        }
59
    }
60
    return ret;
61
62
}

63
void exec_start_outgoing_migration(MigrationState *s, const char *command, Error **errp)
64
65
66
67
68
{
    FILE *f;

    f = popen(command, "w");
    if (f == NULL) {
69
70
        error_setg_errno(errp, errno, "failed to popen the migration target");
        return;
71
72
73
    }

    s->fd = fileno(f);
74
    assert(s->fd != -1);
75
    socket_set_nonblock(s->fd);
76
77
78

    s->opaque = qemu_popen(f, "w");

79
    s->close = exec_close;
80
81
82
83
84
85
    s->get_error = file_errno;
    s->write = file_write;

    migrate_fd_connect(s);
}

86
static void exec_accept_incoming_migration(void *opaque)
87
{
88
    QEMUFile *f = opaque;
89

90
    process_incoming_migration(f);
91
    qemu_set_fd_handler2(qemu_get_fd(f), NULL, NULL, NULL, NULL);
92
    qemu_fclose(f);
93
94
}

95
void exec_start_incoming_migration(const char *command, Error **errp)
96
97
98
{
    QEMUFile *f;

malc's avatar
malc committed
99
    DPRINTF("Attempting to start an incoming migration\n");
100
101
    f = qemu_popen_cmd(command, "r");
    if(f == NULL) {
102
103
        error_setg_errno(errp, errno, "failed to popen the migration source");
        return;
104
105
    }

106
    qemu_set_fd_handler2(qemu_get_fd(f), NULL,
Juan Quintela's avatar
Juan Quintela committed
107
			 exec_accept_incoming_migration, NULL, f);
108
}