libguile/dynl-shl.c

   1 /* dynl-shl.c - dynamic linking with shl_load (HP-UX)
   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    Modified for libguile by Marius Vollmer */
  47
  48 #include "_scm.h"
  49 #include "genio.h"
  50 #include "smob.h"
  51
  52 #include "dl.h"
  53
  54 #define SHL(obj) ((shl_t*)SCM_CDR(obj))
  55
  56 static int printshl SCM_P ((SCM exp, SCM port, scm_printstate *pstate));
  57
  58 static int
  59 prinshl (exp, port, pstate)
  60      SCM exp;
  61      SCM port;
  62      scm_printstate *pstate;
  63 {
  64     scm_gen_puts (scm_regular_string, "#<dynamic-linked ", port);
  65     scm_intprint (SCM_CDR (exp), 16, port);
  66     scm_gen_putc ('>', port);
  67     return 1;
  68 }
  69
  70 int scm_tc16_shl;
  71 static scm_smobfuns shlsmob = { scm_mark0, scm_free0, prinshl };
  72
  73 SCM_PROC (s_dynamic_link, "dynamic-link", 1, 0, 0, scm_dynamic_link);
  74
  75 SCM
  76 scm_dynamic_link (fname)
  77      SCM fname;
  78 {
  79     SCM z;
  80     shl_t shl;
  81
  82     fname = scm_coerce_rostring (fname, s_dynamic_link, SCM_ARG1);
  83
  84     SCM_DEFER_INTS;
  85     shl = shl_load (SCM_CHARS (fname), BIND_DEFERRED , 0L);
  86     if (NULL==shl)
  87         scm_misc_error (s_dynamic_link, "dynamic linking failed", SCM_EOL);
  88     SCM_NEWCELL (z);
  89     SCM_SETCHARS (z, shl);
  90     SCM_SETCAR (z, scm_tc16_shl);
  91     SCM_ALLOW_INTS;
  92
  93     return z;
  94 }
  95
  96 SCM_PROC (s_dynamic_call, "dynamic-call", 2, 0, 0, scm_dynamic_call);
  97
  98 SCM
  99 scm_dynamic_call (symb, shl)
 100      SCM symb, shl;
 101 {
 102     void (*func)() = 0;
 103     int i;
 104
 105     symb = scm_coerce_rostring (symb, s_dynamic_call, SCM_ARG1);
 106     SCM_ASSERT (SCM_NIMP (shl) && SCM_CAR (shl) == scm_tc16_shl, shl, SCM_ARG2,
 107                 s_dynamic_call);
 108
 109     SCM_DEFER_INTS;
 110     if (shl_findsym (&SHL(shl), SCM_CHARS(symb), TYPE_PROCEDURE, &func))
 111         scm_misc_error (s_dynamic_call, "undefined function",
 112                         scm_cons (symb, SCM_EOL));
 113     SCM_ALLOW_INTS;
 114
 115     (*func) ();
 116     return SCM_BOOL_T;
 117 }
 118
 119 SCM_PROC (s_dynamic_args_call, "dynamic-args-call", 3, 0, 0, scm_dynamic_args_call);
 120
 121 SCM
 122 scm_dynamic_args_call (symb, shl, args)
 123      SCM symb, shl, args;
 124 {
 125     int i, argc;
 126     char **argv;
 127     int (*func) SCM_P ((int argc, char **argv)) = 0;
 128
 129     symb = scm_coerce_rostring (symb, s_dynamic_args_call, SCM_ARG1);
 130     SCM_ASSERT (SCM_NIMP (shl) && SCM_CAR(shl) == scm_tc16_shl, shl, SCM_ARG2,
 131                 s_dynamic_args_call);
 132
 133     SCM_DEFER_INTS;
 134     if (shl_findsym(&SHL(shl), SCM_CHARS(symb), TYPE_PROCEDURE, &func))
 135         scm_misc_error (s_dynamic_call, "undefined function: %s",
 136                         scm_cons (symb, SCM_EOL));
 137     argv = scm_make_argv_from_stringlist (args, &argc, s_dynamic_args_call,
 138                                       SCM_ARG3);
 139     SCM_ALLOW_INTS;
 140
 141     i = (*func) (argc, argv);
 142
 143     SCM_DEFER_INTS;
 144     scm_must_free_argv (argv);
 145     SCM_ALLOW_INTS;
 146     return SCM_MAKINUM (0L+i);
 147 }
 148
 149 SCM_PROC (s_dynamic_unlink, "dynamic-unlink", 1, 0, 0, scm_dynamic_unlink);
 150
 151 SCM
 152 scm_dynamic_unlink (shl)
 153      SCM shl;
 154 {
 155     int status;
 156     SCM_ASSERT (SCM_NIMP (shl) && SCM_CAR (shl) == scm_tc16_shl, shl,
 157                 SCM_ARG1, s_dynamic_unlink);
 158
 159     SCM_DEFER_INTS;
 160     status = shl_unload (SHL (shl));
 161     SCM_ALLOW_INTS;
 162     if (!status)
 163         return SCM_BOOL_T;
 164     return SCM_BOOL_F;
 165 }
 166
 167 void
 168 scm_init_dynamic_linking ()
 169 {
 170     scm_tc16_shl = scm_newsmob (&shlsmob);
 171 #include "dynl.x"
 172 }