xref: /qemu/migration/exec.c (revision 83ecdb18) 
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 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, const char *command, Error **errp)
44 {
45     QIOChannel *ioc;
46 
47 #ifdef WIN32
48     const char *argv[] = { exec_get_cmd_path(), "/c", command, NULL };
49 #else
50     const char *argv[] = { "/bin/sh", "-c", command, NULL };
51 #endif
52 
53     trace_migration_exec_outgoing(command);
54     ioc = QIO_CHANNEL(qio_channel_command_new_spawn(argv,
55                                                     O_RDWR,
56                                                     errp));
57     if (!ioc) {
58         return;
59     }
60 
61     qio_channel_set_name(ioc, "migration-exec-outgoing");
62     migration_channel_connect(s, ioc, NULL, NULL);
63     object_unref(OBJECT(ioc));
64 }
65 
66 static gboolean exec_accept_incoming_migration(QIOChannel *ioc,
67                                                GIOCondition condition,
68                                                gpointer opaque)
69 {
70     migration_channel_process_incoming(ioc);
71     object_unref(OBJECT(ioc));
72     return G_SOURCE_REMOVE;
73 }
74 
75 void exec_start_incoming_migration(const char *command, Error **errp)
76 {
77     QIOChannel *ioc;
78 
79 #ifdef WIN32
80     const char *argv[] = { exec_get_cmd_path(), "/c", command, NULL };
81 #else
82     const char *argv[] = { "/bin/sh", "-c", command, NULL };
83 #endif
84 
85     trace_migration_exec_incoming(command);
86     ioc = QIO_CHANNEL(qio_channel_command_new_spawn(argv,
87                                                     O_RDWR,
88                                                     errp));
89     if (!ioc) {
90         return;
91     }
92 
93     qio_channel_set_name(ioc, "migration-exec-incoming");
94     qio_channel_add_watch_full(ioc, G_IO_IN,
95                                exec_accept_incoming_migration,
96                                NULL, NULL,
97                                g_main_context_get_thread_default());
98 }
99