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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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863
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41 #ifndef RTLD_NOW
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42 # define RTLD_NOW 2
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43 #endif
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44
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428
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45 int
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442
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46 dll_init (const char *arg)
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428
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47 {
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48 return 0;
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49 }
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50
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51 dll_handle
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442
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52 dll_open (const char *fname)
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428
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53 {
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880
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54 return (dll_handle) dlopen (fname, RTLD_NOW);
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428
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55 }
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56
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57 int
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58 dll_close (dll_handle h)
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59 {
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442
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60 return dlclose ((void *) h);
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428
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61 }
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62
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63 dll_func
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442
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64 dll_function (dll_handle h, const char *n)
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428
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65 {
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66 #ifdef DLSYM_NEEDS_UNDERSCORE
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67 char *buf = alloca_array (char, strlen (n) + 2);
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68 *buf = '_';
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442
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69 strcpy (buf + 1, n);
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428
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70 n = buf;
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71 #endif
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442
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72 return (dll_func) dlsym ((void *) h, n);
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428
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73 }
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74
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75 dll_var
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442
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76 dll_variable (dll_handle h, const char *n)
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428
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77 {
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78 #ifdef DLSYM_NEEDS_UNDERSCORE
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79 char *buf = alloca_array (char, strlen (n) + 2);
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80 *buf = '_';
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442
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81 strcpy (buf + 1, n);
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428
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82 n = buf;
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83 #endif
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84 return (dll_var)dlsym ((void *)h, n);
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85 }
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86
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442
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87 const char *
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428
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88 dll_error (dll_handle h)
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89 {
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90 #if defined(HAVE_DLERROR) || defined(dlerror)
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442
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91 return (const char *) dlerror ();
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428
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92 #elif defined(HAVE__DLERROR)
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442
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93 return (const char *) _dlerror();
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428
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94 #else
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95 return "Shared library error";
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96 #endif
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97 }
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98
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99 #elif defined(HAVE_SHL_LOAD)
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100 /* This is the HP/UX version */
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101 #include <dl.h>
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102 int
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442
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103 dll_init (const char *arg)
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428
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104 {
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105 return 0;
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106 }
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107
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108 dll_handle
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442
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109 dll_open (const char *fname)
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428
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110 {
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442
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111 /* shl_load will hang hard if passed a NULL fname. */
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112 if (fname == NULL) return NULL;
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428
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113
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442
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114 return (dll_handle) shl_load (fname, BIND_DEFERRED,0L);
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428
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115 }
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116
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117 int
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118 dll_close (dll_handle h)
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119 {
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442
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120 return shl_unload ((shl_t) h);
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428
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121 }
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122
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123 dll_func
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442
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124 dll_function (dll_handle h, const char *n)
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428
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125 {
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126 long handle = 0L;
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127
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442
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128 if (shl_findsym ((shl_t *) &h, n, TYPE_PROCEDURE, &handle))
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428
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129 return NULL;
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130
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442
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131 return (dll_func) handle;
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428
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132 }
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133
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134 dll_var
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442
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135 dll_variable (dll_handle h, const char *n)
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428
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136 {
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137 long handle = 0L;
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138
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442
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139 if (shl_findsym ((shl_t *) &h, n, TYPE_DATA, &handle))
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428
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140 return NULL;
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141
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442
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142 return (dll_var) handle;
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428
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143 }
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144
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442
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145 const char *
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428
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146 dll_error (dll_handle h)
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147 {
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148 /* #### WTF?! Shouldn't this at least attempt to get strerror or
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149 something? --hniksic */
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150 return "Generic shared library error";
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151 }
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152
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153 #elif defined(HAVE_INIT_DLD)
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154 #include <dld.h>
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155 int
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442
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156 dll_init (const char *arg)
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428
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157 {
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158 char *real_exe = dld_find_executable (arg);
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159 int rc;
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160
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161 rc = dld_init (real_exe);
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162 if (rc)
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163 {
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164 dld_perror (exe);
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165 return -1;
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166 }
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167 return 0;
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168 }
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169
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170 dll_handle
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442
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171 dll_open (const char *fname)
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428
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172 {
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173 rc = dld_link (fname);
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174 if (rc)
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175 return NULL;
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176
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442
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177 return (dll_handle) 1;
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428
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178 }
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179
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180 int
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181 dll_close (dll_handle h)
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182 {
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183 /* *sigh* DLD is pretty lame and doesn't return a handle that you can use
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184 ** later on to free the file - you have to remember the filename and
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185 ** use that as the unlinker. We should eventually keep a linked list
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186 ** of loaded modules and then use the node pointer as the unique id
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187 ** for the shared library. Wheeee. But not now.
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188 */
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189 return 1;
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190 }
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191
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192 DLL_FUNC
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442
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193 dll_function (dll_handle h, const char *n)
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428
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194 {
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442
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195 return dld_get_func (n);
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428
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196 }
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197
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198 DLL_FUNC
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442
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199 dll_variable (dll_handle h, const char *n)
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428
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200 {
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442
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201 return dld_get_symbol (n);
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428
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202 }
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442
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203 #elif defined (WIN32_NATIVE)
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204
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205 #define WIN32_LEAN_AND_MEAN
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206 #include <windows.h>
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207 #undef WIN32_LEAN_AND_MEAN
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208
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428
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209 int
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442
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210 dll_init (const char *arg)
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428
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211 {
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212 return 0;
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213 }
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214
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215 dll_handle
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442
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216 dll_open (const char *fname)
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428
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217 {
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442
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218 return (dll_handle) LoadLibrary (fname);
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428
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219 }
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220
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221 int
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222 dll_close (dll_handle h)
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223 {
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224 return FreeLibrary (h);
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225 }
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226
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227 dll_func
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442
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228 dll_function (dll_handle h, const char *n)
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428
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229 {
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442
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230 return (dll_func) GetProcAddress (h, n);
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428
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231 }
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232
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233 dll_func
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442
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234 dll_variable (dll_handle h, const char *n)
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428
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235 {
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442
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236 return (dll_func) GetProcAddress (h, n);
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428
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237 }
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238
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442
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239 const char *
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428
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240 dll_error (dll_handle h)
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241 {
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242 return "Windows DLL Error";
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243 }
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244 #else
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245 /* Catchall if we don't know about this systems method of dynamic loading */
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246 int
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442
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247 dll_init (const char *arg)
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428
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248 {
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249 return -1;
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250 }
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251
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252 dll_handle
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442
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253 dll_open (const char *fname)
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428
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254 {
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255 return NULL;
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256 }
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257
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258 int
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259 dll_close (dll_handle h)
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260 {
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261 return 0;
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262 }
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263
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264 dll_func
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442
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265 dll_function (dll_handle h, const char *n)
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428
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266 {
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267 return NULL;
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268 }
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269
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270 dll_func
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442
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271 dll_variable (dll_handle h, const char *n)
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428
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272 {
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273 return NULL;
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274 }
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275
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442
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276 const char *
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428
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277 dll_error (dll_handle h)
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278 {
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279 return "Shared libraries not implemented on this system";
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280 }
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281 #endif /* System conditionals */
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282
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283 #endif /* HAVE_SHLIB */
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