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
  34 void 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
  45 static 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
  53 void 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 }