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1 // dynamic-ld.cc -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1996 John W. Eaton |
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5 |
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6 This file is part of Octave. |
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7 |
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8 Octave is free software; you can redistribute it and/or modify it |
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9 under the terms of the GNU General Public License as published by the |
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10 Free Software Foundation; either version 2, or (at your option) any |
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11 later version. |
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12 |
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13 Octave is distributed in the hope that it will be useful, but WITHOUT |
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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16 for more details. |
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17 |
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18 You should have received a copy of the GNU General Public License |
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19 along with Octave; see the file COPYING. If not, write to the Free |
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20 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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21 |
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22 */ |
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23 |
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24 #ifdef HAVE_CONFIG_H |
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25 #include <config.h> |
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26 #endif |
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27 |
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28 #if defined (WITH_SHL) |
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29 #include <cerrno> |
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30 #include <cstring> |
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31 #endif |
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32 |
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33 #include <strstream.h> |
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34 |
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35 extern "C" |
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36 { |
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37 #if defined (WITH_DL) |
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38 #include <dlfcn.h> |
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39 #ifndef RTLD_LAZY |
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40 #define RTLD_LAZY 1 |
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41 #endif |
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42 #elif defined (WITH_SHL) |
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43 #include <dl.h> |
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44 #endif |
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45 } |
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46 |
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47 #include "defaults.h" |
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48 #include "dirfns.h" |
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49 #include "dynamic-ld.h" |
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50 #include "error.h" |
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51 #include "toplev.h" |
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52 #include "pathsearch.h" |
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53 #include "pt-const.h" |
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54 #include "user-prefs.h" |
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55 #include "utils.h" |
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56 #include "variables.h" |
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57 |
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58 typedef builtin_function * (*Octave_builtin_fcn_struct_fcn)(void); |
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59 |
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60 #if defined (WITH_DYNAMIC_LINKING) |
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61 |
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62 // XXX FIXME XXX -- need to provide some way to ensure that functions |
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63 // that we are going to use will use the same naming convention as |
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64 // Octave's internal functions. It needs to be simpler than the |
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65 // current DEFUN_DLD() macro, which assumes you know how to name the |
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66 // function, the struct, and the helper function. |
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67 |
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68 static string |
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69 mangle_octave_builtin_name (const string& name) |
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70 { |
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71 string retval ("F"); |
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72 retval.append (name); |
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73 retval.append ("__FRC13Octave_objecti"); |
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74 return retval; |
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75 } |
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76 |
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77 static string |
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78 mangle_octave_oct_file_name (const string& name) |
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79 { |
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80 string retval ("FS"); |
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81 retval.append (name); |
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82 retval.append ("__Fv"); |
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83 return retval; |
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84 } |
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85 |
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86 #if defined (WITH_DL) |
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87 |
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88 static void * |
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89 dl_resolve_octave_reference (const string& name, const string& file) |
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90 { |
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91 void *retval = 0; |
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92 |
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93 // Dynamic linking with dlopen/dlsym doesn't require specification |
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94 // of the libraries at runtime. Instead, they are specified when |
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95 // the .oct file is created. |
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96 |
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97 void *handle = dlopen (file.c_str (), RTLD_LAZY); |
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98 |
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99 if (handle) |
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100 { |
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101 retval = dlsym (handle, name.c_str ()); |
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102 |
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103 if (! retval) |
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104 { |
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105 const char *errmsg = dlerror (); |
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106 |
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107 if (errmsg) |
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108 error("%s: `%s'", name.c_str (), errmsg); |
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109 else |
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110 error("unable to link function `%s'", name.c_str ()); |
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111 |
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112 dlclose (handle); |
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113 } |
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114 } |
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115 else |
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116 error ("%s: %s `%s'", dlerror (), file.c_str (), name.c_str ()); |
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117 |
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118 return retval; |
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119 } |
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120 |
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121 #elif defined (WITH_SHL) |
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122 |
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123 static void * |
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124 shl_resolve_octave_reference (const string& name, const string& file) |
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125 { |
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126 void *retval = 0; |
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127 |
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128 // Dynamic linking with shl_load/shl_findsym doesn't require |
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129 // specification of the libraries at runtime. Instead, they are |
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130 // specified when the .oct file is created. |
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131 |
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132 void *handle = shl_load (file.c_str (), BIND_DEFERRED, 0L); |
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133 |
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134 if (handle) |
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135 { |
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136 int status = shl_findsym ((shl_t *) &handle, name.c_str (), |
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137 TYPE_UNDEFINED, retval); |
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138 |
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139 if (status < 0) |
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140 { |
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141 const char *errmsg = strerror (errno); |
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142 |
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143 if (errmsg) |
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144 error("%s: `%s'", name.c_str (), errmsg); |
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145 else |
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146 error("unable to link function `%s'", name.c_str ()); |
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147 |
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148 retval = 0; |
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149 } |
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150 } |
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151 else |
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152 error ("%s: %s `%s'", strerror (errno), file.c_str (), name.c_str ()); |
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153 |
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154 return retval; |
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155 } |
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156 |
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157 #endif |
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158 #endif |
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159 |
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160 #if defined (WITH_DYNAMIC_LINKING) |
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161 static void * |
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162 resolve_octave_reference (const string& name, const string& file) |
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163 { |
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164 #if defined (WITH_DL) |
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165 |
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166 return dl_resolve_octave_reference (name, file); |
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167 |
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168 #elif defined (WITH_SHL) |
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169 |
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170 return shl_resolve_octave_reference (name, file); |
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171 |
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172 #endif |
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173 } |
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174 #endif |
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175 |
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176 Octave_builtin_fcn |
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177 #if defined (WITH_DYNAMIC_LINKING) |
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178 load_octave_builtin (const string& name) |
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179 #else |
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180 load_octave_builtin (const string&) |
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181 #endif |
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182 { |
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183 Octave_builtin_fcn retval = 0; |
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184 |
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185 #if defined (WITH_DYNAMIC_LINKING) |
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186 |
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187 string mangled_name = mangle_octave_builtin_name (name); |
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188 |
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189 retval = (Octave_builtin_fcn) resolve_octave_reference (mangled_name); |
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190 |
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191 #endif |
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192 |
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193 return retval; |
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194 } |
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195 |
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196 int |
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197 load_octave_oct_file (const string& name) |
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198 { |
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199 int retval = 0; |
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200 |
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201 #if defined (WITH_DYNAMIC_LINKING) |
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202 |
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203 string oct_file = oct_file_in_path (name); |
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204 |
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205 if (oct_file.empty ()) |
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206 { |
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207 string mangled_name = mangle_octave_oct_file_name (name); |
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208 |
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209 Octave_builtin_fcn_struct_fcn f = |
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210 (Octave_builtin_fcn_struct_fcn) resolve_octave_reference |
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211 (mangled_name, oct_file); |
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212 |
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213 if (f) |
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214 { |
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215 builtin_function *s = f (); |
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216 |
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217 if (s) |
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218 { |
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219 install_builtin_function (s); |
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220 retval = 1; |
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221 } |
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222 } |
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223 } |
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224 |
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225 #else |
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226 |
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227 (void) name; |
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228 |
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229 #endif |
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230 |
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231 return retval; |
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232 } |
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233 |
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234 void |
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235 init_dynamic_linker (void) |
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236 { |
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237 // Nothing to do anymore... |
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238 } |
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239 |
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240 /* |
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241 ;;; Local Variables: *** |
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242 ;;; mode: C++ *** |
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243 ;;; page-delimiter: "^/\\*" *** |
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244 ;;; End: *** |
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245 */ |
