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 "qemu/error-report.h" 22 #include "channel.h" 23 #include "exec.h" 24 #include "migration.h" 25 #include "io/channel-command.h" 26 #include "trace.h" 27 #include "qemu/cutils.h" 28 29 #ifdef WIN32 30 const char *exec_get_cmd_path(void) 31 { 32 g_autofree char *detected_path = g_new(char, MAX_PATH); 33 if (GetSystemDirectoryA(detected_path, MAX_PATH) == 0) { 34 warn_report("Could not detect cmd.exe path, using default."); 35 return "C:\\Windows\\System32\\cmd.exe"; 36 } 37 pstrcat(detected_path, MAX_PATH, "\\cmd.exe"); 38 return g_steal_pointer(&detected_path); 39 } 40 #endif 41 42 /* provides the length of strList */ 43 static int 44 str_list_length(strList *list) 45 { 46 int len = 0; 47 strList *elem; 48 49 for (elem = list; elem != NULL; elem = elem->next) { 50 len++; 51 } 52 53 return len; 54 } 55 56 static void 57 init_exec_array(strList *command, char **argv, Error **errp) 58 { 59 int i = 0; 60 strList *lst; 61 62 for (lst = command; lst; lst = lst->next) { 63 argv[i++] = lst->value; 64 } 65 66 argv[i] = NULL; 67 return; 68 } 69 70 void exec_start_outgoing_migration(MigrationState *s, strList *command, 71 Error **errp) 72 { 73 QIOChannel *ioc; 74 75 int length = str_list_length(command); 76 g_auto(GStrv) argv = (char **) g_new0(const char *, length + 1); 77 78 init_exec_array(command, argv, errp); 79 g_autofree char *new_command = g_strjoinv(" ", (char **)argv); 80 81 trace_migration_exec_outgoing(new_command); 82 ioc = QIO_CHANNEL( 83 qio_channel_command_new_spawn( 84 (const char * const *) g_steal_pointer(&argv), 85 O_RDWR, 86 errp)); 87 if (!ioc) { 88 return; 89 } 90 91 qio_channel_set_name(ioc, "migration-exec-outgoing"); 92 migration_channel_connect(s, ioc, NULL, NULL); 93 object_unref(OBJECT(ioc)); 94 } 95 96 static gboolean exec_accept_incoming_migration(QIOChannel *ioc, 97 GIOCondition condition, 98 gpointer opaque) 99 { 100 migration_channel_process_incoming(ioc); 101 object_unref(OBJECT(ioc)); 102 return G_SOURCE_REMOVE; 103 } 104 105 void exec_start_incoming_migration(strList *command, Error **errp) 106 { 107 QIOChannel *ioc; 108 109 int length = str_list_length(command); 110 g_auto(GStrv) argv = (char **) g_new0(const char *, length + 1); 111 112 init_exec_array(command, argv, errp); 113 g_autofree char *new_command = g_strjoinv(" ", (char **)argv); 114 115 trace_migration_exec_incoming(new_command); 116 ioc = QIO_CHANNEL( 117 qio_channel_command_new_spawn( 118 (const char * const *) g_steal_pointer(&argv), 119 O_RDWR, 120 errp)); 121 if (!ioc) { 122 return; 123 } 124 125 qio_channel_set_name(ioc, "migration-exec-incoming"); 126 qio_channel_add_watch_full(ioc, G_IO_IN, 127 exec_accept_incoming_migration, 128 NULL, NULL, 129 g_main_context_get_thread_default()); 130 } 131