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
  38 void 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
  49 static 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
  57 void 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 }