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265
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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 <stdlib.h>
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27 #include <assert.h>
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28 #include <string.h>
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29 #include <stdio.h>
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30 #include "sysdll.h"
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31
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32 /* This whole file is conditional upon HAVE_DLL */
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33 #ifdef HAVE_SHLIB
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34
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35 /* Thankfully, most systems follow the ELFish dlopen() method.
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36 ** HAVE__DLOPEN is lame, but SCO has their dl* functions as _dl*, and
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37 ** unless you include dlfcn.h you don't get the macros to mask them, and
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38 ** autoconf fails to find them.
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39 **
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40 ** Anybody who wants to use this on SCO needs to have their configure.in
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41 ** look for _dlopen() as well as dlopen()
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42 */
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43 #if defined(HAVE_DLOPEN) || defined(HAVE__DLOPEN)
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44 #include <dlfcn.h>
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45
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46 #ifndef RTLD_LAZY
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47 #define RTLD_LAZY 1
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48 #endif /* RTLD_LAZY isn't defined under FreeBSD - ick */
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49
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50 #ifndef RTLD_GLOBAL
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51 #define RTLD_GLOBAL 0
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52 #endif
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53
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54 int dll_init(CONST char *arg) {
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55 return(0);
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56 }
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57
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58 dll_handle dll_open(CONST char *fname) {
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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 dll_close(dll_handle h) {
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63 return(dlclose((void *)h));
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64 }
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65
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66 dll_func dll_function(dll_handle h,CONST char *n) {
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67 #ifdef DLSYM_NEEDS_UNDERSCORE
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68 char buf[1024];
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69 *buf = '_';
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70 (void)strcpy(buf + 1, n);
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71 n = buf;
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72 #endif
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73 return((dll_func)dlsym((void *)h,n));
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74 }
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75
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76 dll_var dll_variable(dll_handle h,CONST char *n) {
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77 return((dll_var)dlsym((void *)h,n));
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78 }
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79
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80 CONST char *dll_error(dll_handle h) {
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81 #ifdef HAVE_DLERROR
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82 return((CONST char *)dl_error());
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83 #else
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84 return("Shared library error");
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85 #endif
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86 }
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87
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88 #elif defined(HAVE_SHL_LOAD)
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89 /* This is the HP/UX version */
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90 #include <dl.h>
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91 int dll_init(CONST char *arg) {
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92 return(0);
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93 }
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94
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95 dll_handle dll_open(CONST char *fname) {
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96 return((dll_handle)shl_load(fname,BIND_DEFERRED,0L));
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97 }
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98
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99 int dll_close(dll_handle h) {
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100 return (shl_unload((shl_t)h));
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101 }
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102
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103 dll_func dll_function(dll_handle h,CONST char *n) {
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104 long handle = 0L;
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105
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106 if (shl_findsym(&(shl_t)h,n,TYPE_PROCEDURE,&handle))
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107 return(NULL);
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108
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109 return((dll_func)handle);
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110 }
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111
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112 dll_var dll_variable(dll_handle h,CONST char *n) {
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113 long handle = 0L;
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114
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115 if (shl_findsym(&(shl_t)h,n,TYPE_DATA,&handle))
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116 return(NULL);
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117
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118 return((dll_var)handle);
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119 }
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120
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121 CONST char *dll_error(dll_handle h) {
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122 return("Generic shared library error");
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123 }
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124
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125 #elif defined(HAVE_INIT_DLD)
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126 #include <dld.h>
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127 int dll_init(CONST char *arg) {
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128 char *real_exe = dld_find_executable(arg);
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129 int rc;
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130
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131 rc = dld_init(real_exe);
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132 if (rc) {
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133 dld_perror (exe);
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134 return(-1);
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135 }
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136 return(0);
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137 }
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138
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139 dll_handle dll_open(CONST char *fname) {
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140 rc = dld_link(fname);
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141 if (rc) {
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142 return (NULL);
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143 }
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144 return((dll_handle)1);
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145 }
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146
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147 int dll_close(dll_handle h) {
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148 /* *sigh* DLD is pretty lame and doesn't return a handle that you can use
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149 ** later on to free the file - you have to remember the filename and
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150 ** use that as the unlinker. We should eventually keep a linked list
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151 ** of loaded modules and then use the node pointer as the unique id
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152 ** for the shared library. Wheeee. But not now.
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153 */
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154 return(1);
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155 }
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156
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157 DLL_FUNC dll_function(dll_handle h,CONST char *n) {
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158 return (dld_get_func(n));
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159 }
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160
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161 DLL_FUNC dll_variable(dll_handle h,CONST char *n) {
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162 return (dld_get_symbol(n));
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163 }
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164 #elif defined(_WINDOWS) || defined(WIN32)
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165 int dll_init(CONST char *arg) {
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166 return(0);
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167 }
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168
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169 dll_handle dll_open(CONST char *fname) {
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170 return((dll_handle)LoadLibrary(fname));
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171 }
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172
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173 int dll_close(dll_handle h) {
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174 return(FreeLibrary(h));
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175 }
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176
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177 dll_func dll_function(dll_handle h,CONST char *n) {
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178 return((dll_func)GetProcAddress(h,n));
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179 }
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180
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181 dll_func dll_variable(dll_handle h,CONST char *n) {
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182 return((dll_func)GetProcAddress(h,n));
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183 }
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184
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185 CONST char *dll_error(dll_handle h) {
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186 return("Windows DLL Error");
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187 }
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188 #else
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189 /* Catchall if we don't know about this systems method of dynamic loading */
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190 int dll_init(CONST char *arg) {
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191 return(-1);
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192 }
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193
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194 dll_handle dll_open(CONST char *fname) {
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195 return(NULL);
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196 }
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197
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198 int dll_close(dll_handle h) {
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199 return(0);
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200 }
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201
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202 dll_func dll_function(dll_handle h,CONST char *n) {
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203 return(NULL);
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204 }
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205
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206 dll_func dll_variable(dll_handle h,CONST char *n) {
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207 return(NULL);
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208 }
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209
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210 CONST char *dll_error(dll_handle h) {
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211 return("Shared libraries not implemented on this system.");
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212 }
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213 #endif /* System conditionals */
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214
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215 #endif /* HAVE_SHLIB */
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