migration/exec.c

   1 /*
   2  * QEMU live migration
   3  *
   4  * Copyright IBM, Corp. 2008
   5  * Copyright Dell MessageOne 2008
   6  * Copyright Red Hat, Inc. 2015-2016
   7  *
   8  * Authors:
   9  *  Anthony Liguori   <aliguori@us.ibm.com>
  10  *  Charles Duffy     <charles_duffy@messageone.com>
  11  *  Daniel P. Berrange <berrange@redhat.com>
  12  *
  13  * This work is licensed under the terms of the GNU GPL, version 2.  See
  14  * the COPYING file in the top-level directory.
  15  *
  16  * Contributions after 2012-01-13 are licensed under the terms of the
  17  * GNU GPL, version 2 or (at your option) any later version.
  18  */
  19
  20 #include "qemu/osdep.h"
  21 #include "qapi/type-helpers.h"
  22 #include "qemu/error-report.h"
  23 #include "channel.h"
  24 #include "exec.h"
  25 #include "migration.h"
  26 #include "io/channel-command.h"
  27 #include "trace.h"
  28 #include "qemu/cutils.h"
  29
  30 #ifdef WIN32
  31 const char *exec_get_cmd_path(void)
  32 {
  33     g_autofree char *detected_path = g_new(char, MAX_PATH);
  34     if (GetSystemDirectoryA(detected_path, MAX_PATH) == 0) {
  35         warn_report("Could not detect cmd.exe path, using default.");
  36         return "C:\\Windows\\System32\\cmd.exe";
  37     }
  38     pstrcat(detected_path, MAX_PATH, "\\cmd.exe");
  39     return g_steal_pointer(&detected_path);
  40 }
  41 #endif
  42
  43 void exec_start_outgoing_migration(MigrationState *s, strList *command,
  44                                    Error **errp)
  45 {
  46     QIOChannel *ioc = NULL;
  47     g_auto(GStrv) argv = strv_from_str_list(command);
  48     const char * const *args = (const char * const *) argv;
  49     g_autofree char *new_command = g_strjoinv(" ", (char **)argv);
  50
  51     trace_migration_exec_outgoing(new_command);
  52     ioc = QIO_CHANNEL(qio_channel_command_new_spawn(args, O_RDWR, errp));
  53     if (!ioc) {
  54         return;
  55     }
  56
  57     qio_channel_set_name(ioc, "migration-exec-outgoing");
  58     migration_channel_connect(s, ioc, NULL, NULL);
  59     object_unref(OBJECT(ioc));
  60 }
  61
  62 static gboolean exec_accept_incoming_migration(QIOChannel *ioc,
  63                                                GIOCondition condition,
  64                                                gpointer opaque)
  65 {
  66     migration_channel_process_incoming(ioc);
  67     object_unref(OBJECT(ioc));
  68     return G_SOURCE_REMOVE;
  69 }
  70
  71 void exec_start_incoming_migration(strList *command, Error **errp)
  72 {
  73     QIOChannel *ioc;
  74     g_auto(GStrv) argv = strv_from_str_list(command);
  75     const char * const *args = (const char * const *) argv;
  76     g_autofree char *new_command = g_strjoinv(" ", (char **)argv);
  77
  78     trace_migration_exec_incoming(new_command);
  79     ioc = QIO_CHANNEL(qio_channel_command_new_spawn(args, O_RDWR, errp));
  80     if (!ioc) {
  81         return;
  82     }
  83
  84     qio_channel_set_name(ioc, "migration-exec-incoming");
  85     qio_channel_add_watch_full(ioc, G_IO_IN,
  86                                exec_accept_incoming_migration,
  87                                NULL, NULL,
  88                                g_main_context_get_thread_default());
  89 }