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Linux kernel mirror (for testing)
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linux
1/*
2 * Details of the "wire" protocol between Xen Store Daemon and client
3 * library or guest kernel.
4 * Copyright (C) 2005 Rusty Russell IBM Corporation
5 */
6
7#ifndef _XS_WIRE_H
8#define _XS_WIRE_H
9
10enum xsd_sockmsg_type
11{
12 XS_DEBUG,
13 XS_DIRECTORY,
14 XS_READ,
15 XS_GET_PERMS,
16 XS_WATCH,
17 XS_UNWATCH,
18 XS_TRANSACTION_START,
19 XS_TRANSACTION_END,
20 XS_INTRODUCE,
21 XS_RELEASE,
22 XS_GET_DOMAIN_PATH,
23 XS_WRITE,
24 XS_MKDIR,
25 XS_RM,
26 XS_SET_PERMS,
27 XS_WATCH_EVENT,
28 XS_ERROR,
29 XS_IS_DOMAIN_INTRODUCED,
30 XS_RESUME,
31 XS_SET_TARGET,
32 XS_RESTRICT
33};
34
35#define XS_WRITE_NONE "NONE"
36#define XS_WRITE_CREATE "CREATE"
37#define XS_WRITE_CREATE_EXCL "CREATE|EXCL"
38
39/* We hand errors as strings, for portability. */
40struct xsd_errors
41{
42 int errnum;
43 const char *errstring;
44};
45#define XSD_ERROR(x) { x, #x }
46static struct xsd_errors xsd_errors[] __attribute__((unused)) = {
47 XSD_ERROR(EINVAL),
48 XSD_ERROR(EACCES),
49 XSD_ERROR(EEXIST),
50 XSD_ERROR(EISDIR),
51 XSD_ERROR(ENOENT),
52 XSD_ERROR(ENOMEM),
53 XSD_ERROR(ENOSPC),
54 XSD_ERROR(EIO),
55 XSD_ERROR(ENOTEMPTY),
56 XSD_ERROR(ENOSYS),
57 XSD_ERROR(EROFS),
58 XSD_ERROR(EBUSY),
59 XSD_ERROR(EAGAIN),
60 XSD_ERROR(EISCONN)
61};
62
63struct xsd_sockmsg
64{
65 uint32_t type; /* XS_??? */
66 uint32_t req_id;/* Request identifier, echoed in daemon's response. */
67 uint32_t tx_id; /* Transaction id (0 if not related to a transaction). */
68 uint32_t len; /* Length of data following this. */
69
70 /* Generally followed by nul-terminated string(s). */
71};
72
73enum xs_watch_type
74{
75 XS_WATCH_PATH = 0,
76 XS_WATCH_TOKEN
77};
78
79/* Inter-domain shared memory communications. */
80#define XENSTORE_RING_SIZE 1024
81typedef uint32_t XENSTORE_RING_IDX;
82#define MASK_XENSTORE_IDX(idx) ((idx) & (XENSTORE_RING_SIZE-1))
83struct xenstore_domain_interface {
84 char req[XENSTORE_RING_SIZE]; /* Requests to xenstore daemon. */
85 char rsp[XENSTORE_RING_SIZE]; /* Replies and async watch events. */
86 XENSTORE_RING_IDX req_cons, req_prod;
87 XENSTORE_RING_IDX rsp_cons, rsp_prod;
88};
89
90/* Violating this is very bad. See docs/misc/xenstore.txt. */
91#define XENSTORE_PAYLOAD_MAX 4096
92
93#endif /* _XS_WIRE_H */