libguile/dynl-vms.c

   1 /* dynl-vms.c - dynamic linking for VMS, not yet ported
   2  *
   3  * Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2, or (at your option)
   8  * any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this software; see the file COPYING.  If not, write to
  17  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  18  *
  19  * As a special exception, the Free Software Foundation gives permission
  20  * for additional uses of the text contained in its release of GUILE.
  21  *
  22  * The exception is that, if you link the GUILE library with other files
  23  * to produce an executable, this does not by itself cause the
  24  * resulting executable to be covered by the GNU General Public License.
  25  * Your use of that executable is in no way restricted on account of
  26  * linking the GUILE library code into it.
  27  *
  28  * This exception does not however invalidate any other reasons why
  29  * the executable file might be covered by the GNU General Public License.
  30  *
  31  * This exception applies only to the code released by the
  32  * Free Software Foundation under the name GUILE.  If you copy
  33  * code from other Free Software Foundation releases into a copy of
  34  * GUILE, as the General Public License permits, the exception does
  35  * not apply to the code that you add in this way.  To avoid misleading
  36  * anyone as to the status of such modified files, you must delete
  37  * this exception notice from them.
  38  *
  39  * If you write modifications of your own for GUILE, it is your choice
  40  * whether to permit this exception to apply to your modifications.
  41  * If you do not wish that, delete this exception notice.
  42  */
  43
  44 /* "dynl.c" dynamically link&load object files.
  45    Author: Aubrey Jaffer
  46    (Not yet) modified for libguile by Marius Vollmer */
  47
  48 /* We should try to implement dynamic-link/dynamic-call for VMS,
  49    too. */
  50
  51 #include "_scm.h"
  52
  53 /* This permits dynamic linking. For example, the procedure of 0 arguments
  54    from a file could be the initialization procedure.
  55    (vms:dynamic-link-call "MYDISK:[MYDIR].EXE" "foo" "INIT_FOO")
  56    The first argument specifies the directory where the file specified
  57    by the second argument resides.  The current directory would be
  58    "SYS$DISK:[].EXE".
  59    The second argument cannot contain any punctuation.
  60    The third argument probably needs to be uppercased to mimic the VMS linker.
  61    */
  62
  63 # include <descrip.h>
  64 # include <ssdef.h>
  65 # include <rmsdef.h>
  66
  67 struct dsc$descriptor *descriptorize(x, buff)
  68      struct dsc$descriptor *x;
  69      SCM buff;
  70 {(*x).dsc$w_length = LENGTH(buff);
  71  (*x).dsc$a_pointer = CHARS(buff);
  72  (*x).dsc$b_class = DSC$K_CLASS_S;
  73  (*x).dsc$b_dtype = DSC$K_DTYPE_T;
  74  return(x);}
  75
  76 static char s_dynl[] = "vms:dynamic-link-call";
  77 SCM dynl(dir, symbol, fname)
  78      SCM dir, symbol, fname;
  79 {
  80   struct dsc$descriptor fnamed, symbold, dird;
  81   void (*fcn)();
  82   long retval;
  83   ASSERT(IMP(dir) || STRINGP(dir), dir, ARG1, s_dynl);
  84   ASSERT(NIMP(fname) && STRINGP(fname), fname, ARG2, s_dynl);
  85   ASSERT(NIMP(symbol) && STRINGP(symbol), symbol, ARG3, s_dynl);
  86   descriptorize(&fnamed, fname);
  87   descriptorize(&symbold, symbol);
  88   DEFER_INTS;
  89   retval = lib$find_image_symbol(&fnamed, &symbold, &fcn,
  90                                  IMP(dir) ? 0 : descriptorize(&dird, dir));
  91   if (SS$_NORMAL != retval) {
  92     /* wta(MAKINUM(retval), "vms error", s_dynl); */
  93     ALLOW_INTS;
  94     return BOOL_F;
  95   }
  96   ALLOW_INTS;
  97 /*  *loc_loadpath = dir; */
  98   (*fcn)();
  99 /*  *loc_loadpath = oloadpath; */
 100   return BOOL_T;
 101 }
 102
 103 void init_dynl()
 104 {
 105   make_subr(s_dynl, tc7_subr_3, dynl);
 106 }