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/osdep.h"
  19#include "qapi/error.h"
  20#include "qemu-common.h"
  21#include "qemu/sockets.h"
  22#include "qemu/main-loop.h"
  23#include "migration/migration.h"
  24#include "migration/qemu-file.h"
  25#include "block/block.h"
  26#include <sys/wait.h>
  27
  28//#define DEBUG_MIGRATION_EXEC
  29
  30#ifdef DEBUG_MIGRATION_EXEC
  31#define DPRINTF(fmt, ...) \
  32    do { printf("migration-exec: " fmt, ## __VA_ARGS__); } while (0)
  33#else
  34#define DPRINTF(fmt, ...) \
  35    do { } while (0)
  36#endif
  37
  38void exec_start_outgoing_migration(MigrationState *s, const char *command, Error **errp)
  39{
  40    s->to_dst_file = qemu_popen_cmd(command, "w");
  41    if (s->to_dst_file == NULL) {
  42        error_setg_errno(errp, errno, "failed to popen the migration target");
  43        return;
  44    }
  45
  46    migrate_fd_connect(s);
  47}
  48
  49static void exec_accept_incoming_migration(void *opaque)
  50{
  51    QEMUFile *f = opaque;
  52
  53    qemu_set_fd_handler(qemu_get_fd(f), NULL, NULL, NULL);
  54    process_incoming_migration(f);
  55}
  56
  57void exec_start_incoming_migration(const char *command, Error **errp)
  58{
  59    QEMUFile *f;
  60
  61    DPRINTF("Attempting to start an incoming migration\n");
  62    f = qemu_popen_cmd(command, "r");
  63    if(f == NULL) {
  64        error_setg_errno(errp, errno, "failed to popen the migration source");
  65        return;
  66    }
  67
  68    qemu_set_fd_handler(qemu_get_fd(f), exec_accept_incoming_migration, NULL,
  69                        f);
  70}
  71