131 lines
3.5 KiB
C
131 lines
3.5 KiB
C
/*
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* Details of the "wire" protocol between Xen Store Daemon and client
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* library or guest kernel.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* Copyright (C) 2005 Rusty Russell IBM Corporation
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*/
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#ifndef _XS_WIRE_H
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#define _XS_WIRE_H
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enum xsd_sockmsg_type
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{
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XS_DEBUG,
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XS_DIRECTORY,
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XS_READ,
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XS_GET_PERMS,
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XS_WATCH,
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XS_UNWATCH,
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XS_TRANSACTION_START,
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XS_TRANSACTION_END,
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XS_INTRODUCE,
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XS_RELEASE,
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XS_GET_DOMAIN_PATH,
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XS_WRITE,
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XS_MKDIR,
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XS_RM,
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XS_SET_PERMS,
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XS_WATCH_EVENT,
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XS_ERROR,
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XS_IS_DOMAIN_INTRODUCED,
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XS_RESUME,
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XS_SET_TARGET
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};
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#define XS_WRITE_NONE "NONE"
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#define XS_WRITE_CREATE "CREATE"
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#define XS_WRITE_CREATE_EXCL "CREATE|EXCL"
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/* We hand errors as strings, for portability. */
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struct xsd_errors
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{
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int errnum;
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const char *errstring;
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};
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#define XSD_ERROR(x) { x, #x }
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/* LINTED: static unused */
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static struct xsd_errors xsd_errors[]
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#if defined(__GNUC__)
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__attribute__((unused))
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#endif
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= {
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XSD_ERROR(EINVAL),
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XSD_ERROR(EACCES),
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XSD_ERROR(EEXIST),
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XSD_ERROR(EISDIR),
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XSD_ERROR(ENOENT),
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XSD_ERROR(ENOMEM),
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XSD_ERROR(ENOSPC),
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XSD_ERROR(EIO),
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XSD_ERROR(ENOTEMPTY),
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XSD_ERROR(ENOSYS),
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XSD_ERROR(EROFS),
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XSD_ERROR(EBUSY),
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XSD_ERROR(EAGAIN),
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XSD_ERROR(EISCONN)
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};
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struct xsd_sockmsg
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{
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uint32_t type; /* XS_??? */
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uint32_t req_id;/* Request identifier, echoed in daemon's response. */
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uint32_t tx_id; /* Transaction id (0 if not related to a transaction). */
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uint32_t len; /* Length of data following this. */
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/* Generally followed by nul-terminated string(s). */
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};
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enum xs_watch_type
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{
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XS_WATCH_PATH = 0,
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XS_WATCH_TOKEN
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};
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/* Inter-domain shared memory communications. */
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#define XENSTORE_RING_SIZE 1024
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typedef uint32_t XENSTORE_RING_IDX;
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#define MASK_XENSTORE_IDX(idx) ((idx) & (XENSTORE_RING_SIZE-1))
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struct xenstore_domain_interface {
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char req[XENSTORE_RING_SIZE]; /* Requests to xenstore daemon. */
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char rsp[XENSTORE_RING_SIZE]; /* Replies and async watch events. */
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XENSTORE_RING_IDX req_cons, req_prod;
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XENSTORE_RING_IDX rsp_cons, rsp_prod;
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};
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/* Violating this is very bad. See docs/misc/xenstore.txt. */
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#define XENSTORE_PAYLOAD_MAX 4096
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/* Violating these just gets you an error back */
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#define XENSTORE_ABS_PATH_MAX 3072
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#define XENSTORE_REL_PATH_MAX 2048
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#endif /* _XS_WIRE_H */
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/*
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* Local variables:
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* mode: C
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* c-set-style: "BSD"
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* c-basic-offset: 4
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* tab-width: 4
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* indent-tabs-mode: nil
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* End:
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*/
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