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