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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 ** HAVE__DLOPEN is lame, but SCO has their dl* functions as _dl*, and
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34 ** unless you include dlfcn.h you don't get the macros to mask them, and
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35 ** autoconf fails to find them. No longer true as of 5.0.5.
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36 **
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37 ** Anybody who wants to use this on SCO needs to have their configure.in
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38 ** look for _dlopen() as well as dlopen()
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39 */
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40 #if defined(HAVE_DLOPEN) || defined(HAVE__DLOPEN) || defined(HAVE_DLFCN_H)
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41 #include <dlfcn.h>
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42
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43 #ifndef RTLD_LAZY
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44 # define RTLD_LAZY 1
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45 #endif /* RTLD_LAZY isn't defined under FreeBSD - ick */
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46
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47 #ifndef RTLD_GLOBAL
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48 # define RTLD_GLOBAL 0
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49 #endif
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50
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51 int
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442
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52 dll_init (const char *arg)
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428
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53 {
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54 return 0;
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55 }
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56
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57 dll_handle
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442
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58 dll_open (const char *fname)
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428
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59 {
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442
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60 return (dll_handle) dlopen (fname, RTLD_LAZY | RTLD_GLOBAL);
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428
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61 }
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62
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63 int
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64 dll_close (dll_handle h)
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65 {
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442
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66 return dlclose ((void *) h);
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428
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67 }
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68
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69 dll_func
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442
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70 dll_function (dll_handle h, const char *n)
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428
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71 {
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72 #ifdef DLSYM_NEEDS_UNDERSCORE
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73 char *buf = alloca_array (char, strlen (n) + 2);
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74 *buf = '_';
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442
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75 strcpy (buf + 1, n);
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428
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76 n = buf;
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77 #endif
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442
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78 return (dll_func) dlsym ((void *) h, n);
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428
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79 }
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80
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81 dll_var
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442
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82 dll_variable (dll_handle h, const char *n)
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428
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83 {
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84 #ifdef DLSYM_NEEDS_UNDERSCORE
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85 char *buf = alloca_array (char, strlen (n) + 2);
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86 *buf = '_';
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442
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87 strcpy (buf + 1, n);
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428
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88 n = buf;
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89 #endif
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90 return (dll_var)dlsym ((void *)h, n);
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91 }
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92
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442
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93 const char *
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428
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94 dll_error (dll_handle h)
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95 {
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96 #if defined(HAVE_DLERROR) || defined(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 #elif defined(HAVE__DLERROR)
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442
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99 return (const char *) _dlerror();
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428
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100 #else
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101 return "Shared library error";
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102 #endif
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103 }
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104
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105 #elif defined(HAVE_SHL_LOAD)
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106 /* This is the HP/UX version */
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107 #include <dl.h>
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108 int
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442
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109 dll_init (const char *arg)
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428
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110 {
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111 return 0;
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112 }
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113
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114 dll_handle
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442
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115 dll_open (const char *fname)
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428
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116 {
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442
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117 /* shl_load will hang hard if passed a NULL fname. */
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118 if (fname == NULL) return NULL;
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428
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119
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442
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120 return (dll_handle) shl_load (fname, BIND_DEFERRED,0L);
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428
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121 }
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122
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123 int
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124 dll_close (dll_handle h)
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125 {
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442
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126 return shl_unload ((shl_t) h);
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428
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127 }
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128
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129 dll_func
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442
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130 dll_function (dll_handle h, const char *n)
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428
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131 {
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132 long handle = 0L;
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133
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442
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134 if (shl_findsym ((shl_t *) &h, n, TYPE_PROCEDURE, &handle))
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428
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135 return NULL;
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136
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442
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137 return (dll_func) handle;
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428
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138 }
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139
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140 dll_var
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442
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141 dll_variable (dll_handle h, const char *n)
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428
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142 {
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143 long handle = 0L;
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144
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442
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145 if (shl_findsym ((shl_t *) &h, n, TYPE_DATA, &handle))
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428
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146 return NULL;
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147
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442
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148 return (dll_var) handle;
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428
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149 }
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150
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442
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151 const char *
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428
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152 dll_error (dll_handle h)
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153 {
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154 /* #### WTF?! Shouldn't this at least attempt to get strerror or
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155 something? --hniksic */
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156 return "Generic shared library error";
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157 }
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158
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159 #elif defined(HAVE_INIT_DLD)
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160 #include <dld.h>
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161 int
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442
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162 dll_init (const char *arg)
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428
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163 {
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164 char *real_exe = dld_find_executable (arg);
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165 int rc;
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166
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167 rc = dld_init (real_exe);
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168 if (rc)
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169 {
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170 dld_perror (exe);
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171 return -1;
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172 }
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173 return 0;
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174 }
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175
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176 dll_handle
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442
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177 dll_open (const char *fname)
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428
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178 {
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179 rc = dld_link (fname);
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180 if (rc)
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181 return NULL;
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182
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442
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183 return (dll_handle) 1;
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428
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184 }
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185
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186 int
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187 dll_close (dll_handle h)
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188 {
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189 /* *sigh* DLD is pretty lame and doesn't return a handle that you can use
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190 ** later on to free the file - you have to remember the filename and
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191 ** use that as the unlinker. We should eventually keep a linked list
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192 ** of loaded modules and then use the node pointer as the unique id
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193 ** for the shared library. Wheeee. But not now.
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194 */
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195 return 1;
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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_function (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_func (n);
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428
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202 }
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203
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204 DLL_FUNC
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442
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205 dll_variable (dll_handle h, const char *n)
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428
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206 {
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442
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207 return dld_get_symbol (n);
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428
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208 }
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442
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209 #elif defined (WIN32_NATIVE)
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210
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211 #define WIN32_LEAN_AND_MEAN
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212 #include <windows.h>
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213 #undef WIN32_LEAN_AND_MEAN
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214
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428
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215 int
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442
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216 dll_init (const char *arg)
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428
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217 {
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218 return 0;
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219 }
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220
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221 dll_handle
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442
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222 dll_open (const char *fname)
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428
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223 {
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442
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224 return (dll_handle) LoadLibrary (fname);
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428
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225 }
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226
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227 int
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228 dll_close (dll_handle h)
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229 {
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230 return FreeLibrary (h);
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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_function (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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239 dll_func
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442
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240 dll_variable (dll_handle h, const char *n)
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428
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241 {
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442
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242 return (dll_func) GetProcAddress (h, n);
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428
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243 }
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244
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442
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245 const char *
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428
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246 dll_error (dll_handle h)
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247 {
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248 return "Windows DLL Error";
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249 }
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250 #else
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251 /* Catchall if we don't know about this systems method of dynamic loading */
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252 int
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442
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253 dll_init (const char *arg)
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428
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254 {
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255 return -1;
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256 }
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257
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258 dll_handle
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442
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259 dll_open (const char *fname)
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428
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260 {
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261 return NULL;
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262 }
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263
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264 int
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265 dll_close (dll_handle h)
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266 {
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267 return 0;
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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_function (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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276 dll_func
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442
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277 dll_variable (dll_handle h, const char *n)
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428
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278 {
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279 return NULL;
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280 }
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281
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442
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282 const char *
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428
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283 dll_error (dll_handle h)
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284 {
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285 return "Shared libraries not implemented on this system";
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286 }
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287 #endif /* System conditionals */
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288
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289 #endif /* HAVE_SHLIB */
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