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1 /* |
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2 |
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3 Copyright (C) 1996 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave 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 Octave 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 Octave; see the file COPYING. If not, write to the Free |
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19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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23 #ifdef HAVE_CONFIG_H |
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24 #include <config.h> |
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25 #endif |
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26 |
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27 #if defined (WITH_SHL) |
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28 #include <cerrno> |
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29 #include <cstring> |
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30 #endif |
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31 |
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32 #include <strstream.h> |
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33 |
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34 extern "C" |
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35 { |
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36 #if defined (WITH_DL) |
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37 #include <dlfcn.h> |
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38 #ifndef RTLD_LAZY |
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39 #define RTLD_LAZY 1 |
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40 #endif |
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41 #elif defined (WITH_SHL) |
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42 #include <dl.h> |
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43 #endif |
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44 } |
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45 |
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46 #include "defaults.h" |
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47 #include "dirfns.h" |
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48 #include "dynamic-ld.h" |
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49 #include "error.h" |
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50 #include "toplev.h" |
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51 #include "pathsearch.h" |
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52 #include "pt-const.h" |
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53 #include "user-prefs.h" |
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54 #include "utils.h" |
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55 #include "variables.h" |
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56 |
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57 typedef builtin_function * (*Octave_builtin_fcn_struct_fcn)(void); |
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58 |
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59 #if defined (WITH_DYNAMIC_LINKING) |
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60 |
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61 // XXX FIXME XXX -- need to provide some way to ensure that functions |
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62 // that we are going to use will use the same naming convention as |
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63 // Octave's internal functions. It needs to be simpler than the |
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64 // current DEFUN_DLD() macro, which assumes you know how to name the |
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65 // function, the struct, and the helper function. |
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66 |
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67 static string |
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68 mangle_octave_oct_file_name (const string& name) |
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69 { |
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70 string retval ("FS"); |
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71 retval.append (name); |
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72 retval.append ("__Fv"); |
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73 return retval; |
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74 } |
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75 |
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76 #if defined (WITH_DL) |
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77 |
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78 static void * |
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79 dl_resolve_octave_reference (const string& name, const string& file) |
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80 { |
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81 void *retval = 0; |
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82 |
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83 // Dynamic linking with dlopen/dlsym doesn't require specification |
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84 // of the libraries at runtime. Instead, they are specified when |
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85 // the .oct file is created. |
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86 |
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87 void *handle = dlopen (file.c_str (), RTLD_LAZY); |
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88 |
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89 if (handle) |
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90 { |
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91 retval = dlsym (handle, name.c_str ()); |
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92 |
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93 if (! retval) |
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94 { |
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95 const char *errmsg = dlerror (); |
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96 |
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97 if (errmsg) |
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98 error("%s: `%s'", name.c_str (), errmsg); |
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99 else |
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100 error("unable to link function `%s'", name.c_str ()); |
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101 |
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102 dlclose (handle); |
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103 } |
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104 } |
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105 else |
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106 error ("%s: %s `%s'", dlerror (), file.c_str (), name.c_str ()); |
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107 |
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108 return retval; |
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109 } |
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110 |
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111 #elif defined (WITH_SHL) |
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112 |
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113 static void * |
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114 shl_resolve_octave_reference (const string& name, const string& file) |
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115 { |
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116 void *retval = 0; |
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117 |
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118 // Dynamic linking with shl_load/shl_findsym doesn't require |
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119 // specification of the libraries at runtime. Instead, they are |
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120 // specified when the .oct file is created. |
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121 |
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122 void *handle = shl_load (file.c_str (), BIND_DEFERRED, 0L); |
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123 |
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124 if (handle) |
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125 { |
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126 int status = shl_findsym ((shl_t *) &handle, name.c_str (), |
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127 TYPE_UNDEFINED, retval); |
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128 |
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129 if (status < 0) |
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130 { |
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131 const char *errmsg = strerror (errno); |
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132 |
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133 if (errmsg) |
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134 error("%s: `%s'", name.c_str (), errmsg); |
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135 else |
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136 error("unable to link function `%s'", name.c_str ()); |
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137 |
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138 retval = 0; |
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139 } |
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140 } |
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141 else |
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142 error ("%s: %s `%s'", strerror (errno), file.c_str (), name.c_str ()); |
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143 |
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144 return retval; |
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145 } |
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146 |
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147 #endif |
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148 #endif |
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149 |
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150 #if defined (WITH_DYNAMIC_LINKING) |
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151 static void * |
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152 resolve_octave_reference (const string& name, const string& file) |
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153 { |
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154 #if defined (WITH_DL) |
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155 |
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156 return dl_resolve_octave_reference (name, file); |
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157 |
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158 #elif defined (WITH_SHL) |
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159 |
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160 return shl_resolve_octave_reference (name, file); |
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161 |
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162 #endif |
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163 } |
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164 #endif |
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165 |
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166 int |
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167 load_octave_oct_file (const string& name) |
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168 { |
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169 int retval = 0; |
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170 |
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171 #if defined (WITH_DYNAMIC_LINKING) |
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172 |
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173 string oct_file = oct_file_in_path (name); |
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174 |
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175 if (! oct_file.empty ()) |
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176 { |
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177 string mangled_name = mangle_octave_oct_file_name (name); |
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178 |
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179 Octave_builtin_fcn_struct_fcn f = |
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180 (Octave_builtin_fcn_struct_fcn) resolve_octave_reference |
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181 (mangled_name, oct_file); |
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182 |
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183 if (f) |
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184 { |
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185 builtin_function *s = f (); |
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186 |
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187 if (s) |
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188 { |
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189 install_builtin_function (*s); |
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190 retval = 1; |
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191 } |
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192 } |
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193 } |
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194 |
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195 #else |
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196 |
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197 (void) name; |
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198 |
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199 #endif |
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200 |
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201 return retval; |
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202 } |
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203 |
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204 void |
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205 init_dynamic_linker (void) |
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206 { |
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207 // Nothing to do anymore... |
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208 } |
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209 |
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210 /* |
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211 ;;; Local Variables: *** |
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212 ;;; mode: C++ *** |
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213 ;;; End: *** |
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214 */ |
