139 lines
4.5 KiB
C
139 lines
4.5 KiB
C
/* $NetBSD: pmap_prot2.c,v 1.14 2000/07/06 03:10:34 christos Exp $ */
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/*-
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* Copyright (c) 2009, Sun Microsystems, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* - Neither the name of Sun Microsystems, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char *sccsid2 = "@(#)pmap_prot2.c 1.3 87/08/11 Copyr 1984 Sun Micro";
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static char *sccsid = "@(#)pmap_prot2.c 2.1 88/07/29 4.0 RPCSRC";
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* pmap_prot2.c
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* Protocol for the local binder service, or pmap.
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*
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* Copyright (C) 1984, Sun Microsystems, Inc.
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*/
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#include "namespace.h"
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#include <assert.h>
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#include <rpc/types.h>
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#include <rpc/xdr.h>
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#include <rpc/pmap_prot.h>
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#include "un-namespace.h"
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/*
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* What is going on with linked lists? (!)
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* First recall the link list declaration from pmap_prot.h:
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*
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* struct pmaplist {
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* struct pmap pml_map;
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* struct pmaplist *pml_map;
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* };
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*
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* Compare that declaration with a corresponding xdr declaration that
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* is (a) pointer-less, and (b) recursive:
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*
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* typedef union switch (bool_t) {
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*
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* case TRUE: struct {
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* struct pmap;
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* pmaplist_t foo;
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* };
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*
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* case FALSE: struct {};
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* } pmaplist_t;
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*
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* Notice that the xdr declaration has no nxt pointer while
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* the C declaration has no bool_t variable. The bool_t can be
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* interpreted as ``more data follows me''; if FALSE then nothing
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* follows this bool_t; if TRUE then the bool_t is followed by
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* an actual struct pmap, and then (recursively) by the
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* xdr union, pamplist_t.
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*
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* This could be implemented via the xdr_union primitive, though this
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* would cause a one recursive call per element in the list. Rather than do
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* that we can ``unwind'' the recursion
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* into a while loop and do the union arms in-place.
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*
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* The head of the list is what the C programmer wishes to past around
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* the net, yet is the data that the pointer points to which is interesting;
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* this sounds like a job for xdr_reference!
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*/
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bool_t
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xdr_pmaplist(XDR *xdrs, struct pmaplist **rp)
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{
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/*
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* more_elements is pre-computed in case the direction is
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* XDR_ENCODE or XDR_FREE. more_elements is overwritten by
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* xdr_bool when the direction is XDR_DECODE.
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*/
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bool_t more_elements;
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int freeing;
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struct pmaplist **next = NULL; /* pacify gcc */
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assert(xdrs != NULL);
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assert(rp != NULL);
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freeing = (xdrs->x_op == XDR_FREE);
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for (;;) {
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more_elements = (bool_t)(*rp != NULL);
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if (! xdr_bool(xdrs, &more_elements))
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return (FALSE);
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if (! more_elements)
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return (TRUE); /* we are done */
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/*
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* the unfortunate side effect of non-recursion is that in
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* the case of freeing we must remember the next object
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* before we free the current object ...
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*/
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if (freeing)
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next = &((*rp)->pml_next);
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if (! xdr_reference(xdrs, (caddr_t *)rp,
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(u_int)sizeof(struct pmaplist), (xdrproc_t)xdr_pmap))
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return (FALSE);
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rp = (freeing) ? next : &((*rp)->pml_next);
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}
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}
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/*
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* xdr_pmaplist_ptr() is specified to take a PMAPLIST *, but is identical in
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* functionality to xdr_pmaplist().
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*/
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bool_t
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xdr_pmaplist_ptr(XDR *xdrs, struct pmaplist *rp)
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{
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return xdr_pmaplist(xdrs, (struct pmaplist **)(void *)rp);
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}
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