1 /*****************************************************************************
2 * xenbus.h
3 *
4 * Xenbus protocol details.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to
8 * deal in the Software without restriction, including without limitation the
9 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
10 * sell copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22 * DEALINGS IN THE SOFTWARE.
23 *
24 * Copyright (C) 2005 XenSource Ltd.
25 */
26
27 #ifndef _XEN_PUBLIC_IO_XENBUS_H
28 #define _XEN_PUBLIC_IO_XENBUS_H
29
30 /*
31 * The state of either end of the Xenbus, i.e. the current communication
32 * status of initialisation across the bus. States here imply nothing about
33 * the state of the connection between the driver and the kernel's device
34 * layers.
35 */
36 enum xenbus_state {
37 XenbusStateUnknown = 0,
38
39 /*
40 * Initializing: Back-end is initializing.
41 */
42 XenbusStateInitialising = 1,
43
44 /*
45 * InitWait: Finished early initialisation but waiting for information
46 * from the peer or hotplug scripts.
47 */
48 XenbusStateInitWait = 2,
49
50 /*
51 * Initialised: Waiting for a connection from the peer.
52 */
53 XenbusStateInitialised = 3,
54
55 /*
56 * Connected: The normal state for a front to backend connection.
57 */
58 XenbusStateConnected = 4,
59
60 /*
61 * Closing: The device is being closed due to an error or an unplug event.
62 */
63 XenbusStateClosing = 5,
64
65 /*
66 * Closed: No connection exists between front and back end.
67 *
68 * For backend devices with the "online" attribute, the front can
69 * request a reconnect at any time. To handle this transition
70 * gracefully, backend devices must reinitialize any XenStore data
71 * used to negotiate features with a peer before transitioning to
72 * the closed state. When a reconnect request occurs, the
73 * XenBus backend support code will automatically transition the
74 * backend device from Closed to InitWait, kicking off the ring
75 * and feature negotiation process.
76 */
77 XenbusStateClosed = 6,
78
79 /*
80 * Reconfiguring: The device is being reconfigured.
81 */
82 XenbusStateReconfiguring = 7,
83
84 XenbusStateReconfigured = 8
85 };
86 typedef enum xenbus_state XenbusState;
87
88 #endif /* _XEN_PUBLIC_IO_XENBUS_H */
89
90 /*
91 * Local variables:
92 * mode: C
93 * c-set-style: "BSD"
94 * c-basic-offset: 4
95 * tab-width: 4
96 * indent-tabs-mode: nil
97 * End:
98 */
Cache object: 682f383d22c404764c1bcfad39705a4c
|