1 /*
2 * Details of the "wire" protocol between Xen Store Daemon and client
3 * library or guest kernel.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a copy
6 * of this software and associated documentation files (the "Software"), to
7 * deal in the Software without restriction, including without limitation the
8 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
9 * sell copies of the Software, and to permit persons to whom the Software is
10 * furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
22 *
23 * Copyright (C) 2005 Rusty Russell IBM Corporation
24 */
25
26 #ifndef _XS_WIRE_H
27 #define _XS_WIRE_H
28
29 enum xsd_sockmsg_type
30 {
31 XS_DEBUG,
32 XS_DIRECTORY,
33 XS_READ,
34 XS_GET_PERMS,
35 XS_WATCH,
36 XS_UNWATCH,
37 XS_TRANSACTION_START,
38 XS_TRANSACTION_END,
39 XS_INTRODUCE,
40 XS_RELEASE,
41 XS_GET_DOMAIN_PATH,
42 XS_WRITE,
43 XS_MKDIR,
44 XS_RM,
45 XS_SET_PERMS,
46 XS_WATCH_EVENT,
47 XS_ERROR,
48 XS_IS_DOMAIN_INTRODUCED,
49 XS_RESUME,
50 XS_SET_TARGET,
51 XS_RESTRICT,
52 XS_RESET_WATCHES
53 };
54
55 #define XS_WRITE_NONE "NONE"
56 #define XS_WRITE_CREATE "CREATE"
57 #define XS_WRITE_CREATE_EXCL "CREATE|EXCL"
58
59 /* We hand errors as strings, for portability. */
60 struct xsd_errors
61 {
62 int errnum;
63 const char *errstring;
64 };
65 #ifdef EINVAL
66 #define XSD_ERROR(x) { x, #x }
67 /* LINTED: static unused */
68 static struct xsd_errors xsd_errors[]
69 #if defined(__GNUC__)
70 __attribute__((unused))
71 #endif
72 = {
73 XSD_ERROR(EINVAL),
74 XSD_ERROR(EACCES),
75 XSD_ERROR(EEXIST),
76 XSD_ERROR(EISDIR),
77 XSD_ERROR(ENOENT),
78 XSD_ERROR(ENOMEM),
79 XSD_ERROR(ENOSPC),
80 XSD_ERROR(EIO),
81 XSD_ERROR(ENOTEMPTY),
82 XSD_ERROR(ENOSYS),
83 XSD_ERROR(EROFS),
84 XSD_ERROR(EBUSY),
85 XSD_ERROR(EAGAIN),
86 XSD_ERROR(EISCONN)
87 };
88 #endif
89
90 struct xsd_sockmsg
91 {
92 uint32_t type; /* XS_??? */
93 uint32_t req_id;/* Request identifier, echoed in daemon's response. */
94 uint32_t tx_id; /* Transaction id (0 if not related to a transaction). */
95 uint32_t len; /* Length of data following this. */
96
97 /* Generally followed by nul-terminated string(s). */
98 };
99
100 enum xs_watch_type
101 {
102 XS_WATCH_PATH = 0,
103 XS_WATCH_TOKEN
104 };
105
106 /* Inter-domain shared memory communications. */
107 #define XENSTORE_RING_SIZE 1024
108 typedef uint32_t XENSTORE_RING_IDX;
109 #define MASK_XENSTORE_IDX(idx) ((idx) & (XENSTORE_RING_SIZE-1))
110 struct xenstore_domain_interface {
111 char req[XENSTORE_RING_SIZE]; /* Requests to xenstore daemon. */
112 char rsp[XENSTORE_RING_SIZE]; /* Replies and async watch events. */
113 XENSTORE_RING_IDX req_cons, req_prod;
114 XENSTORE_RING_IDX rsp_cons, rsp_prod;
115 };
116
117 /* Violating this is very bad. See docs/misc/xenstore.txt. */
118 #define XENSTORE_PAYLOAD_MAX 4096
119
120 /* Violating these just gets you an error back */
121 #define XENSTORE_ABS_PATH_MAX 3072
122 #define XENSTORE_REL_PATH_MAX 2048
123
124 #endif /* _XS_WIRE_H */
125
126 /*
127 * Local variables:
128 * mode: C
129 * c-set-style: "BSD"
130 * c-basic-offset: 4
131 * tab-width: 4
132 * indent-tabs-mode: nil
133 * End:
134 */
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