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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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26 #include "sysdll.h"
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27
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28 /* This whole file is conditional upon HAVE_SHLIB */
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29 #ifdef HAVE_SHLIB
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30
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31 /* Thankfully, most systems follow the ELFish dlopen() method.
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32 ** HAVE__DLOPEN is lame, but SCO has their dl* functions as _dl*, and
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33 ** unless you include dlfcn.h you don't get the macros to mask them, and
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34 ** autoconf fails to find them. No longer true as of 5.0.5.
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35 **
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36 ** Anybody who wants to use this on SCO needs to have their configure.in
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37 ** look for _dlopen() as well as dlopen()
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38 */
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39 #if defined(HAVE_DLOPEN) || defined(HAVE__DLOPEN) || defined(HAVE_DLFCN_H)
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40 #include <dlfcn.h>
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41
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42 #ifndef RTLD_LAZY
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43 # define RTLD_LAZY 1
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44 #endif /* RTLD_LAZY isn't defined under FreeBSD - ick */
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45
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46 #ifndef RTLD_GLOBAL
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47 # define RTLD_GLOBAL 0
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48 #endif
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49
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50 int
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51 dll_init (CONST char *arg)
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52 {
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53 return 0;
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54 }
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55
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56 dll_handle
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57 dll_open (CONST char *fname)
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58 {
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59 return (dll_handle)dlopen (fname, RTLD_LAZY | RTLD_GLOBAL);
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60 }
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61
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62 int
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63 dll_close (dll_handle h)
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64 {
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65 return dlclose((void *)h);
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66 }
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67
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68 dll_func
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69 dll_function (dll_handle h, CONST char *n)
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70 {
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71 #ifdef DLSYM_NEEDS_UNDERSCORE
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72 char *buf = alloca_array (char, strlen (n) + 2);
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73 *buf = '_';
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74 (void)strcpy(buf + 1, n);
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75 n = buf;
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76 #endif
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77 return (dll_func)dlsym ((void *)h, n);
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78 }
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79
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80 dll_var
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81 dll_variable (dll_handle h, CONST char *n)
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82 {
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83 #ifdef DLSYM_NEEDS_UNDERSCORE
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84 char *buf = alloca_array (char, strlen (n) + 2);
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85 *buf = '_';
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86 (void)strcpy(buf + 1, n);
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87 n = buf;
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88 #endif
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89 return (dll_var)dlsym ((void *)h, n);
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90 }
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91
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92 CONST char *
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93 dll_error (dll_handle h)
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94 {
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95 #if defined(HAVE_DLERROR) || defined(dlerror)
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96 return (CONST char *)dlerror ();
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97 #elif defined(HAVE__DLERROR)
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98 return (const char *)_dlerror();
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99 #else
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100 return "Shared library error";
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101 #endif
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102 }
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103
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104 #elif defined(HAVE_SHL_LOAD)
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105 /* This is the HP/UX version */
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106 #include <dl.h>
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107 int
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108 dll_init (CONST char *arg)
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109 {
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110 return 0;
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111 }
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112
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113 dll_handle
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114 dll_open (CONST char *fname)
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115 {
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116 shl_t h = shl_load (fname, BIND_DEFERRED,0L);
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117 shl_t *hp = NULL;
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118
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119 if (h)
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120 {
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121 hp = (shl_t *)malloc (sizeof (shl_t));
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122 if (!hp)
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123 shl_unload(h);
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124 else
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125 *hp = h;
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126 }
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127 return (dll_handle)hp;
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128 }
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129
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130 int
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131 dll_close (dll_handle h)
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132 {
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133 shl_t hp = *((shl_t *)h);
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134 free (hp);
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135 return shl_unload(h);
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136 }
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137
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138 dll_func
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139 dll_function (dll_handle h, CONST char *n)
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140 {
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141 long handle = 0L;
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142
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143 if (shl_findsym ((shl_t *)h, n, TYPE_PROCEDURE, &handle))
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144 return NULL;
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145
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146 return (dll_func)handle;
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147 }
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148
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149 dll_var
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150 dll_variable (dll_handle h, CONST char *n)
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151 {
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152 long handle = 0L;
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153
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154 if (shl_findsym ((shl_t *)h, n, TYPE_DATA, &handle))
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155 return NULL;
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156
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157 return (dll_var)handle;
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158 }
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159
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160 CONST char *
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161 dll_error (dll_handle h)
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162 {
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163 /* #### WTF?! Shouldn't this at least attempt to get strerror or
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164 something? --hniksic */
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165 return "Generic shared library error";
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166 }
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167
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168 #elif defined(HAVE_INIT_DLD)
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169 #include <dld.h>
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170 int
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171 dll_init (CONST char *arg)
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172 {
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173 char *real_exe = dld_find_executable (arg);
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174 int rc;
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175
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176 rc = dld_init (real_exe);
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177 if (rc)
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178 {
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179 dld_perror (exe);
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180 return -1;
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181 }
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182 return 0;
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183 }
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184
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185 dll_handle
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186 dll_open (CONST char *fname)
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187 {
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188 rc = dld_link (fname);
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189 if (rc)
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190 return NULL;
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191
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192 return (dll_handle)1;
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193 }
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194
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195 int
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196 dll_close (dll_handle h)
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197 {
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198 /* *sigh* DLD is pretty lame and doesn't return a handle that you can use
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199 ** later on to free the file - you have to remember the filename and
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200 ** use that as the unlinker. We should eventually keep a linked list
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201 ** of loaded modules and then use the node pointer as the unique id
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202 ** for the shared library. Wheeee. But not now.
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203 */
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204 return 1;
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205 }
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206
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207 DLL_FUNC
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208 dll_function (dll_handle h, CONST char *n)
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209 {
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210 return dld_get_func(n);
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211 }
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212
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213 DLL_FUNC
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214 dll_variable (dll_handle h, CONST char *n)
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215 {
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216 return dld_get_symbol(n);
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217 }
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218 #elif defined(_WINDOWS) || defined(WIN32)
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219 int
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220 dll_init (CONST char *arg)
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221 {
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222 return 0;
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223 }
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224
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225 dll_handle
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226 dll_open (CONST char *fname)
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227 {
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228 return (dll_handle)LoadLibrary (fname);
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229 }
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230
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231 int
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232 dll_close (dll_handle h)
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233 {
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234 return FreeLibrary (h);
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235 }
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236
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237 dll_func
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238 dll_function (dll_handle h, CONST char *n)
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239 {
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240 return (dll_func)GetProcAddress (h,n);
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241 }
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242
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243 dll_func
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244 dll_variable (dll_handle h, CONST char *n)
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245 {
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246 return (dll_func)GetProcAddress (h,n);
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247 }
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248
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249 CONST char *
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250 dll_error (dll_handle h)
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251 {
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252 return "Windows DLL Error";
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253 }
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254 #else
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255 /* Catchall if we don't know about this systems method of dynamic loading */
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256 int
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257 dll_init (CONST char *arg)
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258 {
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259 return -1;
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260 }
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261
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262 dll_handle
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263 dll_open (CONST char *fname)
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264 {
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265 return NULL;
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266 }
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267
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268 int
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269 dll_close (dll_handle h)
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270 {
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271 return 0;
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272 }
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273
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274 dll_func
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275 dll_function (dll_handle h, CONST char *n)
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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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280 dll_func
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281 dll_variable (dll_handle h, CONST char *n)
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282 {
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283 return NULL;
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284 }
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285
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286 CONST char *
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287 dll_error (dll_handle h)
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288 {
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289 return "Shared libraries not implemented on this system";
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290 }
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291 #endif /* System conditionals */
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292
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293 #endif /* HAVE_SHLIB */
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