migration/fd.c

   1 /*
   2  * QEMU live migration via generic fd
   3  *
   4  * Copyright Red Hat, Inc. 2009-2016
   5  *
   6  * Authors:
   7  *  Chris Lalancette <clalance@redhat.com>
   8  *  Daniel P. Berrange <berrange@redhat.com>
   9  *
  10  * This work is licensed under the terms of the GNU GPL, version 2.  See
  11  * the COPYING file in the top-level directory.
  12  *
  13  * Contributions after 2012-01-13 are licensed under the terms of the
  14  * GNU GPL, version 2 or (at your option) any later version.
  15  */
  16
  17 #include "qemu/osdep.h"
  18 #include "qapi/error.h"
  19 #include "qemu-common.h"
  20 #include "migration/migration.h"
  21 #include "monitor/monitor.h"
  22 #include "io/channel-util.h"
  23 #include "trace.h"
  24
  25
  26 void fd_start_outgoing_migration(MigrationState *s, const char *fdname, Error **errp)
  27 {
  28     QIOChannel *ioc;
  29     int fd = monitor_get_fd(cur_mon, fdname, errp);
  30     if (fd == -1) {
  31         return;
  32     }
  33
  34     trace_migration_fd_outgoing(fd);
  35     ioc = qio_channel_new_fd(fd, errp);
  36     if (!ioc) {
  37         close(fd);
  38         return;
  39     }
  40
  41     migration_set_outgoing_channel(s, ioc, NULL);
  42     object_unref(OBJECT(ioc));
  43 }
  44
  45 static gboolean fd_accept_incoming_migration(QIOChannel *ioc,
  46                                              GIOCondition condition,
  47                                              gpointer opaque)
  48 {
  49     migration_set_incoming_channel(migrate_get_current(), ioc);
  50     object_unref(OBJECT(ioc));
  51     return FALSE; /* unregister */
  52 }
  53
  54 void fd_start_incoming_migration(const char *infd, Error **errp)
  55 {
  56     QIOChannel *ioc;
  57     int fd;
  58
  59     fd = strtol(infd, NULL, 0);
  60     trace_migration_fd_incoming(fd);
  61
  62     ioc = qio_channel_new_fd(fd, errp);
  63     if (!ioc) {
  64         close(fd);
  65         return;
  66     }
  67
  68     qio_channel_add_watch(ioc,
  69                           G_IO_IN,
  70                           fd_accept_incoming_migration,
  71                           NULL,
  72                           NULL);
  73 }