LXR qemu/migration-fd.c

   1/*
   2 * QEMU live migration via generic fd
   3 *
   4 * Copyright Red Hat, Inc. 2009
   5 *
   6 * Authors:
   7 *  Chris Lalancette <clalance@redhat.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-common.h"
  17#include "qemu/main-loop.h"
  18#include "qemu/sockets.h"
  19#include "migration/migration.h"
  20#include "monitor/monitor.h"
  21#include "migration/qemu-file.h"
  22#include "block/block.h"
  23
  24//#define DEBUG_MIGRATION_FD
  25
  26#ifdef DEBUG_MIGRATION_FD
  27#define DPRINTF(fmt, ...) \
  28    do { printf("migration-fd: " fmt, ## __VA_ARGS__); } while (0)
  29#else
  30#define DPRINTF(fmt, ...) \
  31    do { } while (0)
  32#endif
  33
  34void fd_start_outgoing_migration(MigrationState *s, const char *fdname, Error **errp)
  35{
  36    int fd = monitor_get_fd(cur_mon, fdname, errp);
  37    if (fd == -1) {
  38        return;
  39    }
  40    s->file = qemu_fdopen(fd, "wb");
  41
  42    migrate_fd_connect(s);
  43}
  44
  45static void fd_accept_incoming_migration(void *opaque)
  46{
  47    QEMUFile *f = opaque;
  48
  49    qemu_set_fd_handler2(qemu_get_fd(f), NULL, NULL, NULL, NULL);
  50    process_incoming_migration(f);
  51}
  52
  53void fd_start_incoming_migration(const char *infd, Error **errp)
  54{
  55    int fd;
  56    QEMUFile *f;
  57
  58    DPRINTF("Attempting to start an incoming migration via fd\n");
  59
  60    fd = strtol(infd, NULL, 0);
  61    f = qemu_fdopen(fd, "rb");
  62    if(f == NULL) {
  63        error_setg_errno(errp, errno, "failed to open the source descriptor");
  64        return;
  65    }
  66
  67    qemu_set_fd_handler2(fd, NULL, fd_accept_incoming_migration, NULL, f);
  68}
  69