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https://github.com/xen-project/xen.git
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Roger Pau Monne
c9b0242ad4
Introduce an autoconf macro to check for the include path of certain headers that can be different between OSes. Use such macro to find the correct path for the endian.h header, and modify the users of endian.h to use the output of such check. Suggested-by: Ian Jackson <iwj@xenproject.org> Signed-off-by: Roger Pau Monné <roger.pau@citrix.com> Reviewed-by: Ian Jackson <iwj@xenproject.org> Release-Acked-by: Ian Jackson <iwj@xenproject.org>
132 lines
4.7 KiB
C
132 lines
4.7 KiB
C
/*
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* Xenstore internal state dump definitions.
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* Copyright (C) Juergen Gross, SUSE Software Solutions Germany GmbH
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*
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* Used for live-update and migration, possibly across Xenstore implementations.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef XENSTORE_STATE_H
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#define XENSTORE_STATE_H
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#include INCLUDE_ENDIAN_H
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#include <sys/types.h>
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#ifndef htobe32
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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#define htobe32(x) __builtin_bswap32(x)
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#else
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#define htobe32(x) (x)
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#endif
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#endif
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struct xs_state_preamble {
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char ident[8];
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#define XS_STATE_IDENT "xenstore" /* To be used without the NUL byte. */
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uint32_t version; /* Version in big endian format. */
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#define XS_STATE_VERSION 0x00000001
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uint32_t flags; /* Endianess. */
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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#define XS_STATE_FLAGS 0x00000000 /* Little endian. */
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#else
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#define XS_STATE_FLAGS 0x00000001 /* Big endian. */
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#endif
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};
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/*
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* Each record is starting with xs_state_record_header.
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* All records have a length of a multiple of 8 bytes.
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*/
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/* Common record layout: */
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struct xs_state_record_header {
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uint32_t type;
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#define XS_STATE_TYPE_END 0x00000000
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#define XS_STATE_TYPE_GLOBAL 0x00000001
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#define XS_STATE_TYPE_CONN 0x00000002
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#define XS_STATE_TYPE_WATCH 0x00000003
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#define XS_STATE_TYPE_TA 0x00000004
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#define XS_STATE_TYPE_NODE 0x00000005
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uint32_t length; /* Length of record in bytes. */
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};
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/* Global state of Xenstore: */
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struct xs_state_global {
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int32_t socket_fd; /* File descriptor for socket connections or -1. */
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int32_t evtchn_fd; /* File descriptor for event channel operations. */
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};
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/* Connection to Xenstore: */
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struct xs_state_connection {
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uint32_t conn_id; /* Used as reference in watch and TA records. */
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uint16_t conn_type;
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#define XS_STATE_CONN_TYPE_RING 0
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#define XS_STATE_CONN_TYPE_SOCKET 1
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uint16_t pad;
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union {
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struct {
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uint16_t domid; /* Domain-Id. */
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uint16_t tdomid; /* Id of target domain or DOMID_INVALID. */
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uint32_t evtchn; /* Event channel port. */
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} ring;
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int32_t socket_fd; /* File descriptor for socket connections. */
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} spec;
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uint16_t data_in_len; /* Number of unprocessed bytes read from conn. */
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uint16_t data_resp_len; /* Size of partial response pending for conn. */
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uint32_t data_out_len; /* Number of bytes not yet written to conn. */
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uint8_t data[]; /* Pending data (read, written) + 0-7 pad bytes. */
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};
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/* Watch: */
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struct xs_state_watch {
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uint32_t conn_id; /* Connection this watch is associated with. */
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uint16_t path_length; /* Number of bytes of path watched (incl. 0). */
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uint16_t token_length; /* Number of bytes of watch token (incl. 0). */
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uint8_t data[]; /* Path bytes, token bytes, 0-7 pad bytes. */
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};
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/* Transaction: */
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struct xs_state_transaction {
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uint32_t conn_id; /* Connection this TA is associated with. */
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uint32_t ta_id; /* Transaction Id. */
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};
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/* Node (either XS_STATE_TYPE_NODE or XS_STATE_TYPE_TANODE[_MOD]): */
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struct xs_state_node_perm {
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uint8_t access; /* Access rights. */
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#define XS_STATE_NODE_PERM_NONE 'n'
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#define XS_STATE_NODE_PERM_READ 'r'
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#define XS_STATE_NODE_PERM_WRITE 'w'
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#define XS_STATE_NODE_PERM_BOTH 'b'
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uint8_t flags;
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#define XS_STATE_NODE_PERM_IGNORE 0x01 /* Stale permission, ignore for check. */
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uint16_t domid; /* Domain-Id. */
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};
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struct xs_state_node {
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uint32_t conn_id; /* Connection in case of transaction or 0. */
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uint32_t ta_id; /* Transaction Id or 0. */
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uint16_t path_len; /* Length of path string including NUL byte. */
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uint16_t data_len; /* Length of node data. */
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uint16_t ta_access;
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#define XS_STATE_NODE_TA_DELETED 0x0000
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#define XS_STATE_NODE_TA_READ 0x0001
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#define XS_STATE_NODE_TA_WRITTEN 0x0002
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uint16_t perm_n; /* Number of permissions (0 in TA: node deleted). */
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/* Permissions (first is owner, has full access). */
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struct xs_state_node_perm perms[];
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/* Path and data follows, plus 0-7 pad bytes. */
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};
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#endif /* XENSTORE_STATE_H */
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