The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/xdr/xdr_reference.c

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    1 /*      $NetBSD: xdr_reference.c,v 1.13 2000/01/22 22:19:18 mycroft Exp $ */
    2 
    3 /*
    4  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
    5  * unrestricted use provided that this legend is included on all tape
    6  * media and as a part of the software program in whole or part.  Users
    7  * may copy or modify Sun RPC without charge, but are not authorized
    8  * to license or distribute it to anyone else except as part of a product or
    9  * program developed by the user.
   10  *
   11  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
   12  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
   13  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
   14  *
   15  * Sun RPC is provided with no support and without any obligation on the
   16  * part of Sun Microsystems, Inc. to assist in its use, correction,
   17  * modification or enhancement.
   18  *
   19  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
   20  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
   21  * OR ANY PART THEREOF.
   22  *
   23  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
   24  * or profits or other special, indirect and consequential damages, even if
   25  * Sun has been advised of the possibility of such damages.
   26  *
   27  * Sun Microsystems, Inc.
   28  * 2550 Garcia Avenue
   29  * Mountain View, California  94043
   30  */
   31 
   32 #if defined(LIBC_SCCS) && !defined(lint) 
   33 static char *sccsid2 = "@(#)xdr_reference.c 1.11 87/08/11 SMI";
   34 static char *sccsid = "@(#)xdr_reference.c      2.1 88/07/29 4.0 RPCSRC";
   35 #endif
   36 #include <sys/cdefs.h>
   37 __FBSDID("$FreeBSD: stable/12/sys/xdr/xdr_reference.c 177633 2008-03-26 15:23:12Z dfr $");
   38 
   39 /*
   40  * xdr_reference.c, Generic XDR routines impelmentation.
   41  *
   42  * Copyright (C) 1987, Sun Microsystems, Inc.
   43  *
   44  * These are the "non-trivial" xdr primitives used to serialize and de-serialize
   45  * "pointers".  See xdr.h for more info on the interface to xdr.
   46  */
   47 
   48 #include <sys/param.h>
   49 #include <sys/systm.h>
   50 #include <sys/malloc.h>
   51 
   52 #include <rpc/types.h>
   53 #include <rpc/xdr.h>
   54 
   55 /*
   56  * XDR an indirect pointer
   57  * xdr_reference is for recursively translating a structure that is
   58  * referenced by a pointer inside the structure that is currently being
   59  * translated.  pp references a pointer to storage. If *pp is null
   60  * the  necessary storage is allocated.
   61  * size is the sizeof the referneced structure.
   62  * proc is the routine to handle the referenced structure.
   63  */
   64 bool_t
   65 xdr_reference(XDR *xdrs,
   66     caddr_t *pp,                /* the pointer to work on */
   67     u_int size,                 /* size of the object pointed to */
   68     xdrproc_t proc)             /* xdr routine to handle the object */
   69 {
   70         caddr_t loc = *pp;
   71         bool_t stat;
   72 
   73         if (loc == NULL)
   74                 switch (xdrs->x_op) {
   75                 case XDR_FREE:
   76                         return (TRUE);
   77 
   78                 case XDR_DECODE:
   79                         *pp = loc = (caddr_t) mem_alloc(size);
   80                         if (loc == NULL) {
   81                                 printf("xdr_reference: out of memory");
   82                                 return (FALSE);
   83                         }
   84                         memset(loc, 0, size);
   85                         break;
   86 
   87                 case XDR_ENCODE:
   88                         break;
   89                 }
   90 
   91         stat = (*proc)(xdrs, loc);
   92 
   93         if (xdrs->x_op == XDR_FREE) {
   94                 mem_free(loc, size);
   95                 *pp = NULL;
   96         }
   97         return (stat);
   98 }
   99 
  100 
  101 /*
  102  * xdr_pointer():
  103  *
  104  * XDR a pointer to a possibly recursive data structure. This
  105  * differs with xdr_reference in that it can serialize/deserialiaze
  106  * trees correctly.
  107  *
  108  *  What's sent is actually a union:
  109  *
  110  *  union object_pointer switch (boolean b) {
  111  *  case TRUE: object_data data;
  112  *  case FALSE: void nothing;
  113  *  }
  114  *
  115  * > objpp: Pointer to the pointer to the object.
  116  * > obj_size: size of the object.
  117  * > xdr_obj: routine to XDR an object.
  118  *
  119  */
  120 bool_t
  121 xdr_pointer(XDR *xdrs, char **objpp, u_int obj_size, xdrproc_t xdr_obj)
  122 {
  123 
  124         bool_t more_data;
  125 
  126         more_data = (*objpp != NULL);
  127         if (! xdr_bool(xdrs,&more_data)) {
  128                 return (FALSE);
  129         }
  130         if (! more_data) {
  131                 *objpp = NULL;
  132                 return (TRUE);
  133         }
  134         return (xdr_reference(xdrs,objpp,obj_size,xdr_obj));
  135 }

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