migration-unix.c 2.4 KB
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/*
 * QEMU live migration via Unix Domain Sockets
 *
 * Copyright Red Hat, Inc. 2009
 *
 * Authors:
 *  Chris Lalancette <clalance@redhat.com>
 *
 * This work is licensed under the terms of the GNU GPL, version 2.  See
 * the COPYING file in the top-level directory.
 *
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 * Contributions after 2012-01-13 are licensed under the terms of the
 * GNU GPL, version 2 or (at your option) any later version.
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 */

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#include <string.h>

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#include "qemu-common.h"
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#include "qemu/error-report.h"
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#include "qemu/sockets.h"
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#include "qemu/main-loop.h"
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#include "migration/migration.h"
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#include "migration/qemu-file.h"
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#include "block/block.h"
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//#define DEBUG_MIGRATION_UNIX

#ifdef DEBUG_MIGRATION_UNIX
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#define DPRINTF(fmt, ...) \
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    do { printf("migration-unix: " fmt, ## __VA_ARGS__); } while (0)
#else
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#define DPRINTF(fmt, ...) \
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    do { } while (0)
#endif

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static void unix_wait_for_connect(int fd, Error *err, void *opaque)
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{
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    MigrationState *s = opaque;
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    if (fd < 0) {
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        DPRINTF("migrate connect error: %s\n", error_get_pretty(err));
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        s->file = NULL;
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        migrate_fd_error(s);
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    } else {
        DPRINTF("migrate connect success\n");
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        s->file = qemu_fopen_socket(fd, "wb");
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        migrate_fd_connect(s);
    }
}

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void unix_start_outgoing_migration(MigrationState *s, const char *path, Error **errp)
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{
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    unix_nonblocking_connect(path, unix_wait_for_connect, s, errp);
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}

static void unix_accept_incoming_migration(void *opaque)
{
    struct sockaddr_un addr;
    socklen_t addrlen = sizeof(addr);
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    int s = (intptr_t)opaque;
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    QEMUFile *f;
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    int c, err;
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    do {
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        c = qemu_accept(s, (struct sockaddr *)&addr, &addrlen);
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        err = errno;
    } while (c < 0 && err == EINTR);
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    qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL);
    close(s);
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    DPRINTF("accepted migration\n");
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    if (c < 0) {
        error_report("could not accept migration connection (%s)",
                     strerror(err));
        return;
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    }

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    f = qemu_fopen_socket(c, "rb");
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    if (f == NULL) {
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        error_report("could not qemu_fopen socket");
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        goto out;
    }

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    process_incoming_migration(f);
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    return;

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out:
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    close(c);
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}

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void unix_start_incoming_migration(const char *path, Error **errp)
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{
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    int s;
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    s = unix_listen(path, NULL, 0, errp);
    if (s < 0) {
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        return;
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    }

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    qemu_set_fd_handler2(s, NULL, unix_accept_incoming_migration, NULL,
                         (void *)(intptr_t)s);
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}