LXR qemu/migration-exec.c

   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/sockets.h"
  20#include "migration/migration.h"
  21#include "migration/qemu-file.h"
  22#include "block/block.h"
  23#include <sys/types.h>
  24#include <sys/wait.h>
  25
  26//#define DEBUG_MIGRATION_EXEC
  27
  28#ifdef DEBUG_MIGRATION_EXEC
  29#define DPRINTF(fmt, ...) \
  30    do { printf("migration-exec: " fmt, ## __VA_ARGS__); } while (0)
  31#else
  32#define DPRINTF(fmt, ...) \
  33    do { } while (0)
  34#endif
  35
  36void exec_start_outgoing_migration(MigrationState *s, const char *command, Error **errp)
  37{
  38    s->file = qemu_popen_cmd(command, "w");
  39    if (s->file == NULL) {
  40        error_setg_errno(errp, errno, "failed to popen the migration target");
  41        return;
  42    }
  43
  44    migrate_fd_connect(s);
  45}
  46
  47static void exec_accept_incoming_migration(void *opaque)
  48{
  49    QEMUFile *f = opaque;
  50
  51    qemu_set_fd_handler2(qemu_get_fd(f), NULL, NULL, NULL, NULL);
  52    process_incoming_migration(f);
  53}
  54
  55void exec_start_incoming_migration(const char *command, Error **errp)
  56{
  57    QEMUFile *f;
  58
  59    DPRINTF("Attempting to start an incoming migration\n");
  60    f = qemu_popen_cmd(command, "r");
  61    if(f == NULL) {
  62        error_setg_errno(errp, errno, "failed to popen the migration source");
  63        return;
  64    }
  65
  66    qemu_set_fd_handler2(qemu_get_fd(f), NULL,
  67                         exec_accept_incoming_migration, NULL, f);
  68}
  69