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}; 31 32#define XS_WRITE_NONE "NONE" 33#define XS_WRITE_CREATE "CREATE" 34#define XS_WRITE_CREATE_EXCL "CREATE|EXCL" 35 36/* We hand errors as strings, for portability. */ 37struct xsd_errors 38{ 39 int errnum; 40 const char *errstring; 41}; 42#define XSD_ERROR(x) { x, #x } 43static struct xsd_errors xsd_errors[] __attribute__((unused)) = { 44 XSD_ERROR(EINVAL), 45 XSD_ERROR(EACCES), 46 XSD_ERROR(EEXIST), 47 XSD_ERROR(EISDIR), 48 XSD_ERROR(ENOENT), 49 XSD_ERROR(ENOMEM), 50 XSD_ERROR(ENOSPC), 51 XSD_ERROR(EIO), 52 XSD_ERROR(ENOTEMPTY), 53 XSD_ERROR(ENOSYS), 54 XSD_ERROR(EROFS), 55 XSD_ERROR(EBUSY), 56 XSD_ERROR(EAGAIN), 57 XSD_ERROR(EISCONN) 58}; 59 60struct xsd_sockmsg 61{ 62 uint32_t type; /* XS_??? */ 63 uint32_t req_id;/* Request identifier, echoed in daemon's response. */ 64 uint32_t tx_id; /* Transaction id (0 if not related to a transaction). */ 65 uint32_t len; /* Length of data following this. */ 66 67 /* Generally followed by nul-terminated string(s). */ 68}; 69 70enum xs_watch_type 71{ 72 XS_WATCH_PATH = 0, 73 XS_WATCH_TOKEN 74}; 75 76/* Inter-domain shared memory communications. */ 77#define XENSTORE_RING_SIZE 1024 78typedef uint32_t XENSTORE_RING_IDX; 79#define MASK_XENSTORE_IDX(idx) ((idx) & (XENSTORE_RING_SIZE-1)) 80struct xenstore_domain_interface { 81 char req[XENSTORE_RING_SIZE]; /* Requests to xenstore daemon. */ 82 char rsp[XENSTORE_RING_SIZE]; /* Replies and async watch events. */ 83 XENSTORE_RING_IDX req_cons, req_prod; 84 XENSTORE_RING_IDX rsp_cons, rsp_prod; 85}; 86 87#endif /* _XS_WIRE_H */ 88