zfs/lib/libsolcompat/include/rpc/xdr.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T     */
  28 /*        All Rights Reserved   */
  29
  30 /*
  31  * Portions of this source code were derived from Berkeley 4.3 BSD
  32  * under license from the Regents of the University of California.
  33  */
  34
  35 #ifndef _SOL_RPC_XDR_H_
  36 #define _SOL_RPC_XDR_H_
  37
  38 #include_next <rpc/xdr.h>
  39
  40 /*
  41  * Strangely, my glibc version (2.3.6) doesn't have xdr_control(), so
  42  * we have to hack it in here (source taken from OpenSolaris).
  43  * By the way, it is assumed the xdrmem implementation is used.
  44  */
  45
  46 #define xdr_control(a,b,c) xdrmem_control(a,b,c)
  47
  48 /*
  49  * These are XDR control operators
  50  */
  51
  52 #define XDR_GET_BYTES_AVAIL 1
  53
  54 struct xdr_bytesrec {
  55         bool_t xc_is_last_record;
  56         size_t xc_num_avail;
  57 };
  58
  59 typedef struct xdr_bytesrec xdr_bytesrec;
  60
  61 /*
  62  * These are the request arguments to XDR_CONTROL.
  63  *
  64  * XDR_PEEK - returns the contents of the next XDR unit on the XDR stream.
  65  * XDR_SKIPBYTES - skips the next N bytes in the XDR stream.
  66  * XDR_RDMAGET - for xdr implementation over RDMA, gets private flags from
  67  *               the XDR stream being moved over RDMA
  68  * XDR_RDMANOCHUNK - for xdr implementaion over RDMA, sets private flags in
  69  *                   the XDR stream moving over RDMA.
  70  */
  71 #define XDR_PEEK      2
  72 #define XDR_SKIPBYTES 3
  73 #define XDR_RDMAGET   4
  74 #define XDR_RDMASET   5
  75
  76 /* FIXME: probably doesn't work */
  77 static bool_t
  78 xdrmem_control(XDR *xdrs, int request, void *info)
  79 {
  80         xdr_bytesrec *xptr;
  81         int32_t *int32p;
  82         int len;
  83
  84         switch (request) {
  85
  86         case XDR_GET_BYTES_AVAIL:
  87                 xptr = (xdr_bytesrec *)info;
  88                 xptr->xc_is_last_record = TRUE;
  89                 xptr->xc_num_avail = xdrs->x_handy;
  90                 return (TRUE);
  91
  92         case XDR_PEEK:
  93                 /*
  94                  * Return the next 4 byte unit in the XDR stream.
  95                  */
  96                 if (xdrs->x_handy < sizeof (int32_t))
  97                         return (FALSE);
  98                 int32p = (int32_t *)info;
  99                 *int32p = (int32_t)ntohl((uint32_t)
 100                     (*((int32_t *)(xdrs->x_private))));
 101                 return (TRUE);
 102
 103         case XDR_SKIPBYTES:
 104                 /*
 105                  * Skip the next N bytes in the XDR stream.
 106                  */
 107                 int32p = (int32_t *)info;
 108                 len = RNDUP((int)(*int32p));
 109                 if ((xdrs->x_handy -= len) < 0)
 110                         return (FALSE);
 111                 xdrs->x_private += len;
 112                 return (TRUE);
 113
 114         }
 115         return (FALSE);
 116 }
 117
 118 #endif