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428
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1 /* sysdll.c --- system dependent support for dynamic linked libraries
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2 Copyright (C) 1998 Free Software Foundation, Inc.
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3 Author: William Perry <wmperry@aventail.com>
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4
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5 This file is part of XEmacs.
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6
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7 XEmacs is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 2, or (at your option) any
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10 later version.
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11
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12 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with XEmacs; see the file COPYING. If not, write to the Free
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19 Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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20 02111-1307, USA. */
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21
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22 #ifdef HAVE_CONFIG_H
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23 #include <config.h>
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24 #endif
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25
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430
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26 #include <stdlib.h>
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1272
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27 #include "lisp.h"
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428
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28 #include "sysdll.h"
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29
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30 /* This whole file is conditional upon HAVE_SHLIB */
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31 #ifdef HAVE_SHLIB
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32
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33 /* Thankfully, most systems follow the ELFish dlopen() method.
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34 */
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452
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35 #if defined(HAVE_DLOPEN)
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428
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36 #include <dlfcn.h>
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37
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38 #ifndef RTLD_LAZY
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39 # define RTLD_LAZY 1
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40 #endif /* RTLD_LAZY isn't defined under FreeBSD - ick */
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41
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863
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42 #ifndef RTLD_NOW
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43 # define RTLD_NOW 2
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44 #endif
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45
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428
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46 int
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442
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47 dll_init (const char *arg)
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428
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48 {
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49 return 0;
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50 }
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51
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52 dll_handle
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442
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53 dll_open (const char *fname)
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428
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54 {
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880
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55 return (dll_handle) dlopen (fname, RTLD_NOW);
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428
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56 }
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57
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58 int
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59 dll_close (dll_handle h)
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60 {
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442
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61 return dlclose ((void *) h);
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428
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62 }
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63
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64 dll_func
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442
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65 dll_function (dll_handle h, const char *n)
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428
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66 {
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67 #ifdef DLSYM_NEEDS_UNDERSCORE
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68 char *buf = alloca_array (char, strlen (n) + 2);
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69 *buf = '_';
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442
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70 strcpy (buf + 1, n);
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428
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71 n = buf;
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72 #endif
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442
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73 return (dll_func) dlsym ((void *) h, n);
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428
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74 }
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75
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76 dll_var
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442
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77 dll_variable (dll_handle h, const char *n)
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428
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78 {
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79 #ifdef DLSYM_NEEDS_UNDERSCORE
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80 char *buf = alloca_array (char, strlen (n) + 2);
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81 *buf = '_';
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442
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82 strcpy (buf + 1, n);
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428
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83 n = buf;
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84 #endif
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85 return (dll_var)dlsym ((void *)h, n);
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86 }
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87
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442
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88 const char *
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428
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89 dll_error (dll_handle h)
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90 {
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91 #if defined(HAVE_DLERROR) || defined(dlerror)
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442
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92 return (const char *) dlerror ();
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428
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93 #elif defined(HAVE__DLERROR)
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442
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94 return (const char *) _dlerror();
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428
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95 #else
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96 return "Shared library error";
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97 #endif
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98 }
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99
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100 #elif defined(HAVE_SHL_LOAD)
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101 /* This is the HP/UX version */
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102 #include <dl.h>
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103 int
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442
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104 dll_init (const char *arg)
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428
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105 {
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106 return 0;
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107 }
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108
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109 dll_handle
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442
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110 dll_open (const char *fname)
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428
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111 {
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442
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112 /* shl_load will hang hard if passed a NULL fname. */
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113 if (fname == NULL) return NULL;
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428
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114
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442
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115 return (dll_handle) shl_load (fname, BIND_DEFERRED,0L);
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428
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116 }
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117
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118 int
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119 dll_close (dll_handle h)
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120 {
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442
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121 return shl_unload ((shl_t) h);
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428
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122 }
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123
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124 dll_func
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442
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125 dll_function (dll_handle h, const char *n)
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428
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126 {
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127 long handle = 0L;
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128
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442
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129 if (shl_findsym ((shl_t *) &h, n, TYPE_PROCEDURE, &handle))
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428
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130 return NULL;
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131
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442
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132 return (dll_func) handle;
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428
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133 }
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134
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135 dll_var
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442
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136 dll_variable (dll_handle h, const char *n)
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428
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137 {
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138 long handle = 0L;
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139
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442
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140 if (shl_findsym ((shl_t *) &h, n, TYPE_DATA, &handle))
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428
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141 return NULL;
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142
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442
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143 return (dll_var) handle;
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428
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144 }
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145
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442
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146 const char *
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428
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147 dll_error (dll_handle h)
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148 {
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149 /* #### WTF?! Shouldn't this at least attempt to get strerror or
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150 something? --hniksic */
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151 return "Generic shared library error";
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152 }
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153
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154 #elif defined(HAVE_INIT_DLD)
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155 #include <dld.h>
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156 int
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442
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157 dll_init (const char *arg)
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428
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158 {
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159 char *real_exe = dld_find_executable (arg);
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160 int rc;
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161
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162 rc = dld_init (real_exe);
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163 if (rc)
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164 {
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165 dld_perror (exe);
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166 return -1;
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167 }
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168 return 0;
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169 }
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170
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171 dll_handle
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442
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172 dll_open (const char *fname)
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428
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173 {
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174 rc = dld_link (fname);
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175 if (rc)
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176 return NULL;
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177
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442
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178 return (dll_handle) 1;
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428
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179 }
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180
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181 int
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182 dll_close (dll_handle h)
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183 {
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184 /* *sigh* DLD is pretty lame and doesn't return a handle that you can use
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185 ** later on to free the file - you have to remember the filename and
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186 ** use that as the unlinker. We should eventually keep a linked list
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187 ** of loaded modules and then use the node pointer as the unique id
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188 ** for the shared library. Wheeee. But not now.
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189 */
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190 return 1;
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191 }
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192
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193 DLL_FUNC
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442
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194 dll_function (dll_handle h, const char *n)
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428
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195 {
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442
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196 return dld_get_func (n);
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428
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197 }
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198
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199 DLL_FUNC
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442
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200 dll_variable (dll_handle h, const char *n)
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428
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201 {
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442
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202 return dld_get_symbol (n);
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428
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203 }
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442
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204 #elif defined (WIN32_NATIVE)
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205
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206 #define WIN32_LEAN_AND_MEAN
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207 #include <windows.h>
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208 #undef WIN32_LEAN_AND_MEAN
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209
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428
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210 int
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442
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211 dll_init (const char *arg)
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428
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212 {
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213 return 0;
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214 }
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215
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216 dll_handle
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442
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217 dll_open (const char *fname)
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428
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218 {
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442
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219 return (dll_handle) LoadLibrary (fname);
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428
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220 }
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221
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222 int
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223 dll_close (dll_handle h)
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224 {
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225 return FreeLibrary (h);
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226 }
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227
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228 dll_func
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442
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229 dll_function (dll_handle h, const char *n)
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428
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230 {
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442
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231 return (dll_func) GetProcAddress (h, n);
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428
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232 }
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233
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234 dll_func
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442
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235 dll_variable (dll_handle h, const char *n)
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428
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236 {
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442
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237 return (dll_func) GetProcAddress (h, n);
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428
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238 }
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239
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442
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240 const char *
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428
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241 dll_error (dll_handle h)
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242 {
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243 return "Windows DLL Error";
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244 }
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245 #else
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246 /* Catchall if we don't know about this systems method of dynamic loading */
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247 int
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442
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248 dll_init (const char *arg)
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428
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249 {
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250 return -1;
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251 }
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252
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253 dll_handle
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442
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254 dll_open (const char *fname)
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428
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255 {
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256 return NULL;
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257 }
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258
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259 int
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260 dll_close (dll_handle h)
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261 {
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262 return 0;
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263 }
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264
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265 dll_func
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442
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266 dll_function (dll_handle h, const char *n)
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428
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267 {
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268 return NULL;
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269 }
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270
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271 dll_func
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442
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272 dll_variable (dll_handle h, const char *n)
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428
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273 {
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274 return NULL;
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275 }
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276
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442
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277 const char *
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428
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278 dll_error (dll_handle h)
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279 {
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280 return "Shared libraries not implemented on this system";
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281 }
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282 #endif /* System conditionals */
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283
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284 #endif /* HAVE_SHLIB */
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