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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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428
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27 #include "sysdll.h"
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28
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29 /* This whole file is conditional upon HAVE_SHLIB */
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30 #ifdef HAVE_SHLIB
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31
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32 /* Thankfully, most systems follow the ELFish dlopen() method.
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33 */
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452
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34 #if defined(HAVE_DLOPEN)
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428
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35 #include <dlfcn.h>
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36
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37 #ifndef RTLD_LAZY
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38 # define RTLD_LAZY 1
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39 #endif /* RTLD_LAZY isn't defined under FreeBSD - ick */
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40
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41 #ifndef RTLD_GLOBAL
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42 # define RTLD_GLOBAL 0
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43 #endif
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44
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863
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45 #ifndef RTLD_NOW
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46 # define RTLD_NOW 2
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47 #endif
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48
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428
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49 int
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442
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50 dll_init (const char *arg)
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428
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51 {
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52 return 0;
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53 }
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54
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55 dll_handle
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442
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56 dll_open (const char *fname)
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428
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57 {
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863
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58 return (dll_handle) dlopen (fname, RTLD_NOW | RTLD_GLOBAL);
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428
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59 }
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60
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61 int
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62 dll_close (dll_handle h)
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63 {
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442
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64 return dlclose ((void *) h);
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428
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65 }
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66
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67 dll_func
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442
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68 dll_function (dll_handle h, const char *n)
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428
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69 {
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70 #ifdef DLSYM_NEEDS_UNDERSCORE
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71 char *buf = alloca_array (char, strlen (n) + 2);
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72 *buf = '_';
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442
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73 strcpy (buf + 1, n);
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428
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74 n = buf;
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75 #endif
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442
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76 return (dll_func) dlsym ((void *) h, n);
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428
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77 }
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78
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79 dll_var
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442
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80 dll_variable (dll_handle h, const char *n)
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428
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81 {
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82 #ifdef DLSYM_NEEDS_UNDERSCORE
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83 char *buf = alloca_array (char, strlen (n) + 2);
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84 *buf = '_';
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442
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85 strcpy (buf + 1, n);
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428
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86 n = buf;
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87 #endif
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88 return (dll_var)dlsym ((void *)h, n);
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89 }
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90
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442
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91 const char *
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428
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92 dll_error (dll_handle h)
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93 {
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94 #if defined(HAVE_DLERROR) || defined(dlerror)
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442
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95 return (const char *) dlerror ();
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428
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96 #elif defined(HAVE__DLERROR)
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442
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97 return (const char *) _dlerror();
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428
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98 #else
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99 return "Shared library error";
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100 #endif
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101 }
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102
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103 #elif defined(HAVE_SHL_LOAD)
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104 /* This is the HP/UX version */
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105 #include <dl.h>
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106 int
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442
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107 dll_init (const char *arg)
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428
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108 {
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109 return 0;
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110 }
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111
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112 dll_handle
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442
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113 dll_open (const char *fname)
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428
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114 {
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442
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115 /* shl_load will hang hard if passed a NULL fname. */
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116 if (fname == NULL) return NULL;
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428
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117
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442
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118 return (dll_handle) shl_load (fname, BIND_DEFERRED,0L);
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428
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119 }
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120
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121 int
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122 dll_close (dll_handle h)
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123 {
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442
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124 return shl_unload ((shl_t) h);
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428
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125 }
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126
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127 dll_func
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442
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128 dll_function (dll_handle h, const char *n)
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428
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129 {
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130 long handle = 0L;
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131
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442
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132 if (shl_findsym ((shl_t *) &h, n, TYPE_PROCEDURE, &handle))
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428
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133 return NULL;
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134
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442
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135 return (dll_func) handle;
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428
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136 }
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137
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138 dll_var
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442
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139 dll_variable (dll_handle h, const char *n)
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428
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140 {
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141 long handle = 0L;
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142
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442
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143 if (shl_findsym ((shl_t *) &h, n, TYPE_DATA, &handle))
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428
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144 return NULL;
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145
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442
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146 return (dll_var) handle;
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428
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147 }
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148
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442
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149 const char *
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428
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150 dll_error (dll_handle h)
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151 {
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152 /* #### WTF?! Shouldn't this at least attempt to get strerror or
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153 something? --hniksic */
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154 return "Generic shared library error";
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155 }
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156
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157 #elif defined(HAVE_INIT_DLD)
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158 #include <dld.h>
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159 int
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442
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160 dll_init (const char *arg)
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428
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161 {
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162 char *real_exe = dld_find_executable (arg);
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163 int rc;
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164
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165 rc = dld_init (real_exe);
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166 if (rc)
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167 {
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168 dld_perror (exe);
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169 return -1;
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170 }
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171 return 0;
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172 }
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173
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174 dll_handle
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442
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175 dll_open (const char *fname)
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428
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176 {
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177 rc = dld_link (fname);
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178 if (rc)
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179 return NULL;
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180
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442
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181 return (dll_handle) 1;
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428
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182 }
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183
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184 int
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185 dll_close (dll_handle h)
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186 {
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187 /* *sigh* DLD is pretty lame and doesn't return a handle that you can use
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188 ** later on to free the file - you have to remember the filename and
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189 ** use that as the unlinker. We should eventually keep a linked list
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190 ** of loaded modules and then use the node pointer as the unique id
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191 ** for the shared library. Wheeee. But not now.
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192 */
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193 return 1;
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194 }
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195
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196 DLL_FUNC
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442
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197 dll_function (dll_handle h, const char *n)
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428
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198 {
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442
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199 return dld_get_func (n);
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428
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200 }
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201
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202 DLL_FUNC
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442
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203 dll_variable (dll_handle h, const char *n)
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428
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204 {
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442
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205 return dld_get_symbol (n);
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428
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206 }
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442
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207 #elif defined (WIN32_NATIVE)
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208
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209 #define WIN32_LEAN_AND_MEAN
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210 #include <windows.h>
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211 #undef WIN32_LEAN_AND_MEAN
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212
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428
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213 int
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442
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214 dll_init (const char *arg)
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428
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215 {
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216 return 0;
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217 }
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218
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219 dll_handle
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442
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220 dll_open (const char *fname)
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428
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221 {
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442
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222 return (dll_handle) LoadLibrary (fname);
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428
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223 }
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224
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225 int
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226 dll_close (dll_handle h)
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227 {
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228 return FreeLibrary (h);
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229 }
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230
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231 dll_func
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442
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232 dll_function (dll_handle h, const char *n)
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428
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233 {
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442
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234 return (dll_func) GetProcAddress (h, n);
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428
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235 }
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236
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237 dll_func
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442
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238 dll_variable (dll_handle h, const char *n)
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428
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239 {
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442
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240 return (dll_func) GetProcAddress (h, n);
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428
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241 }
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242
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442
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243 const char *
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428
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244 dll_error (dll_handle h)
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245 {
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246 return "Windows DLL Error";
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247 }
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248 #else
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249 /* Catchall if we don't know about this systems method of dynamic loading */
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250 int
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442
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251 dll_init (const char *arg)
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428
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252 {
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253 return -1;
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254 }
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255
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256 dll_handle
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442
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257 dll_open (const char *fname)
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428
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258 {
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259 return NULL;
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260 }
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261
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262 int
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263 dll_close (dll_handle h)
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264 {
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265 return 0;
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266 }
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267
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268 dll_func
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442
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269 dll_function (dll_handle h, const char *n)
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428
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270 {
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271 return NULL;
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272 }
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273
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274 dll_func
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442
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275 dll_variable (dll_handle h, const char *n)
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428
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276 {
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277 return NULL;
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278 }
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279
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442
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280 const char *
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428
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281 dll_error (dll_handle h)
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282 {
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283 return "Shared libraries not implemented on this system";
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284 }
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285 #endif /* System conditionals */
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286
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287 #endif /* HAVE_SHLIB */
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