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
  36 void 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
  47 static 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
  55 void 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 }