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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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52 dll_init (CONST char *arg)
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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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58 dll_open (CONST char *fname)
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59 {
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60 return (dll_handle)dlopen (fname, RTLD_LAZY | RTLD_GLOBAL);
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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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66 return dlclose((void *)h);
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67 }
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68
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69 dll_func
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70 dll_function (dll_handle h, CONST char *n)
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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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75 (void)strcpy(buf + 1, n);
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76 n = buf;
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77 #endif
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78 return (dll_func)dlsym ((void *)h, n);
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79 }
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80
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81 dll_var
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82 dll_variable (dll_handle h, CONST char *n)
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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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87 (void)strcpy(buf + 1, n);
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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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93 CONST char *
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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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97 return (CONST char *)dlerror ();
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98 #elif defined(HAVE__DLERROR)
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99 return (const char *)_dlerror();
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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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109 dll_init (CONST char *arg)
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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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115 dll_open (CONST char *fname)
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116 {
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117 shl_t h = shl_load (fname, BIND_DEFERRED,0L);
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118 shl_t *hp = NULL;
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119
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120 if (h)
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121 {
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122 hp = (shl_t *)malloc (sizeof (shl_t));
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123 if (!hp)
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124 shl_unload(h);
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125 else
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126 *hp = h;
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127 }
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128 return (dll_handle)hp;
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129 }
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130
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131 int
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132 dll_close (dll_handle h)
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133 {
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134 shl_t hp = *((shl_t *)h);
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135 free (hp);
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136 return shl_unload(h);
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137 }
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138
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139 dll_func
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140 dll_function (dll_handle h, CONST char *n)
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141 {
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142 long handle = 0L;
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143
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144 if (shl_findsym ((shl_t *)h, n, TYPE_PROCEDURE, &handle))
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145 return NULL;
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146
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147 return (dll_func)handle;
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148 }
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149
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150 dll_var
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151 dll_variable (dll_handle h, CONST char *n)
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152 {
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153 long handle = 0L;
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154
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155 if (shl_findsym ((shl_t *)h, n, TYPE_DATA, &handle))
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156 return NULL;
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157
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158 return (dll_var)handle;
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159 }
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160
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161 CONST char *
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162 dll_error (dll_handle h)
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163 {
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164 /* #### WTF?! Shouldn't this at least attempt to get strerror or
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165 something? --hniksic */
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166 return "Generic shared library error";
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167 }
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168
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169 #elif defined(HAVE_INIT_DLD)
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170 #include <dld.h>
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171 int
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172 dll_init (CONST char *arg)
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173 {
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174 char *real_exe = dld_find_executable (arg);
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175 int rc;
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176
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177 rc = dld_init (real_exe);
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178 if (rc)
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179 {
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180 dld_perror (exe);
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181 return -1;
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182 }
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183 return 0;
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184 }
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185
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186 dll_handle
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187 dll_open (CONST char *fname)
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188 {
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189 rc = dld_link (fname);
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190 if (rc)
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191 return NULL;
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192
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193 return (dll_handle)1;
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194 }
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195
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196 int
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197 dll_close (dll_handle h)
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198 {
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199 /* *sigh* DLD is pretty lame and doesn't return a handle that you can use
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200 ** later on to free the file - you have to remember the filename and
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201 ** use that as the unlinker. We should eventually keep a linked list
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202 ** of loaded modules and then use the node pointer as the unique id
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203 ** for the shared library. Wheeee. But not now.
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204 */
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205 return 1;
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206 }
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207
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208 DLL_FUNC
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209 dll_function (dll_handle h, CONST char *n)
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210 {
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211 return dld_get_func(n);
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212 }
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213
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214 DLL_FUNC
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215 dll_variable (dll_handle h, CONST char *n)
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216 {
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217 return dld_get_symbol(n);
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218 }
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219 #elif defined(_WINDOWS) || defined(WIN32)
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220 int
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221 dll_init (CONST char *arg)
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222 {
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223 return 0;
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224 }
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225
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226 dll_handle
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227 dll_open (CONST char *fname)
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228 {
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229 return (dll_handle)LoadLibrary (fname);
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230 }
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231
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232 int
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233 dll_close (dll_handle h)
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234 {
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235 return FreeLibrary (h);
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236 }
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237
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238 dll_func
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239 dll_function (dll_handle h, CONST char *n)
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240 {
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241 return (dll_func)GetProcAddress (h,n);
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242 }
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243
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244 dll_func
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245 dll_variable (dll_handle h, CONST char *n)
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246 {
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247 return (dll_func)GetProcAddress (h,n);
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248 }
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249
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250 CONST char *
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251 dll_error (dll_handle h)
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252 {
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253 return "Windows DLL Error";
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254 }
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255 #else
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256 /* Catchall if we don't know about this systems method of dynamic loading */
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257 int
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258 dll_init (CONST char *arg)
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259 {
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260 return -1;
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261 }
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262
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263 dll_handle
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264 dll_open (CONST char *fname)
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265 {
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266 return NULL;
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267 }
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268
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269 int
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270 dll_close (dll_handle h)
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271 {
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272 return 0;
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273 }
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274
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275 dll_func
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276 dll_function (dll_handle h, CONST char *n)
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277 {
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278 return NULL;
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279 }
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280
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281 dll_func
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282 dll_variable (dll_handle h, CONST char *n)
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283 {
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284 return NULL;
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285 }
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286
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287 CONST char *
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288 dll_error (dll_handle h)
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289 {
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290 return "Shared libraries not implemented on this system";
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291 }
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292 #endif /* System conditionals */
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293
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294 #endif /* HAVE_SHLIB */
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