| Jeremy Fitzhardinge | a42089d | 2007-07-17 18:37:04 -0700 | [diff] [blame] | 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 | |
| 10 | enum 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. */ |
| 37 | struct xsd_errors |
| 38 | { |
| 39 | int errnum; |
| 40 | const char *errstring; |
| 41 | }; |
| 42 | #define XSD_ERROR(x) { x, #x } |
| 43 | static 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 | |
| 60 | struct 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 | |
| 70 | enum 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 |
| 78 | typedef uint32_t XENSTORE_RING_IDX; |
| 79 | #define MASK_XENSTORE_IDX(idx) ((idx) & (XENSTORE_RING_SIZE-1)) |
| 80 | struct 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 */ |