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 "channel.h"
  21 #include "fd.h"
  22 #include "migration/migration.h"
  23 #include "monitor/monitor.h"
  24 #include "io/channel-util.h"
  25 #include "trace.h"
  26
  27
  28 void fd_start_outgoing_migration(MigrationState *s, const char *fdname, Error **errp)
  29 {
  30     QIOChannel *ioc;
  31     int fd = monitor_get_fd(cur_mon, fdname, errp);
  32     if (fd == -1) {
  33         return;
  34     }
  35
  36     trace_migration_fd_outgoing(fd);
  37     ioc = qio_channel_new_fd(fd, errp);
  38     if (!ioc) {
  39         close(fd);
  40         return;
  41     }
  42
  43     qio_channel_set_name(QIO_CHANNEL(ioc), "migration-fd-outgoing");
  44     migration_channel_connect(s, ioc, NULL);
  45     object_unref(OBJECT(ioc));
  46 }
  47
  48 static gboolean fd_accept_incoming_migration(QIOChannel *ioc,
  49                                              GIOCondition condition,
  50                                              gpointer opaque)
  51 {
  52     migration_channel_process_incoming(ioc);
  53     object_unref(OBJECT(ioc));
  54     return FALSE; /* unregister */
  55 }
  56
  57 void fd_start_incoming_migration(const char *infd, Error **errp)
  58 {
  59     QIOChannel *ioc;
  60     int fd;
  61
  62     fd = strtol(infd, NULL, 0);
  63     trace_migration_fd_incoming(fd);
  64
  65     ioc = qio_channel_new_fd(fd, errp);
  66     if (!ioc) {
  67         close(fd);
  68         return;
  69     }
  70
  71     qio_channel_set_name(QIO_CHANNEL(ioc), "migration-fd-incoming");
  72     qio_channel_add_watch(ioc,
  73                           G_IO_IN,
  74                           fd_accept_incoming_migration,
  75                           NULL,
  76                           NULL);
  77 }