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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 "ov.h" |
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53 #include "utils.h" |
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54 #include "variables.h" |
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55 |
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56 typedef builtin_function * (*Octave_builtin_fcn_struct_fcn)(void); |
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57 |
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58 #if defined (WITH_DYNAMIC_LINKING) |
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59 |
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60 // XXX FIXME XXX -- need to provide some way to ensure that functions |
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61 // that we are going to use will use the same naming convention as |
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62 // Octave's internal functions. It needs to be simpler than the |
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63 // current DEFUN_DLD() macro, which assumes you know how to name the |
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64 // function, the struct, and the helper function. |
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65 |
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66 static string |
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67 mangle_octave_oct_file_name (const string& name) |
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68 { |
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69 string retval ("FS"); |
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70 retval.append (name); |
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71 retval.append ("__Fv"); |
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72 return retval; |
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73 } |
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74 |
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75 #if defined (WITH_DL) |
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76 |
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77 static void * |
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78 dl_resolve_octave_reference (const string& name, const string& file) |
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79 { |
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80 void *retval = 0; |
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81 |
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82 // Dynamic linking with dlopen/dlsym doesn't require specification |
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83 // of the libraries at runtime. Instead, they are specified when |
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84 // the .oct file is created. |
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85 |
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86 void *handle = dlopen (file.c_str (), RTLD_LAZY); |
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87 |
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88 if (handle) |
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89 { |
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90 retval = dlsym (handle, name.c_str ()); |
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91 |
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92 if (! retval) |
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93 { |
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94 const char *errmsg = dlerror (); |
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95 |
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96 if (errmsg) |
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97 error("%s: `%s'", name.c_str (), errmsg); |
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98 else |
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99 error("unable to link function `%s'", name.c_str ()); |
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100 |
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101 dlclose (handle); |
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102 } |
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103 } |
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104 else |
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105 error ("%s: %s `%s'", dlerror (), file.c_str (), name.c_str ()); |
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106 |
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107 return retval; |
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108 } |
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109 |
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110 #elif defined (WITH_SHL) |
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111 |
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112 static void * |
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113 shl_resolve_octave_reference (const string& name, const string& file) |
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114 { |
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115 void *retval = 0; |
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116 |
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117 // Dynamic linking with shl_load/shl_findsym doesn't require |
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118 // specification of the libraries at runtime. Instead, they are |
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119 // specified when the .oct file is created. |
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120 |
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121 shl_t handle = shl_load (file.c_str (), BIND_DEFERRED, 0L); |
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122 |
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123 if (handle) |
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124 { |
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125 int status = shl_findsym (&handle, name.c_str (), |
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126 TYPE_UNDEFINED, retval); |
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127 |
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128 if (status < 0) |
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129 { |
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130 const char *errmsg = strerror (errno); |
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131 |
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132 if (errmsg) |
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133 error("%s: `%s'", name.c_str (), errmsg); |
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134 else |
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135 error("unable to link function `%s'", name.c_str ()); |
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136 |
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137 retval = 0; |
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138 } |
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139 } |
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140 else |
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141 error ("%s: %s `%s'", strerror (errno), file.c_str (), name.c_str ()); |
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142 |
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143 return retval; |
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144 } |
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145 |
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146 #endif |
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147 #endif |
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148 |
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149 #if defined (WITH_DYNAMIC_LINKING) |
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150 static void * |
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151 resolve_octave_reference (const string& name, const string& file) |
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152 { |
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153 #if defined (WITH_DL) |
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154 |
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155 return dl_resolve_octave_reference (name, file); |
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156 |
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157 #elif defined (WITH_SHL) |
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158 |
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159 return shl_resolve_octave_reference (name, file); |
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160 |
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161 #endif |
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162 } |
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163 #endif |
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164 |
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165 int |
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166 load_octave_oct_file (const string& name) |
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167 { |
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168 int retval = 0; |
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169 |
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170 #if defined (WITH_DYNAMIC_LINKING) |
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171 |
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172 string oct_file = oct_file_in_path (name); |
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173 |
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174 if (! oct_file.empty ()) |
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175 { |
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176 string mangled_name = mangle_octave_oct_file_name (name); |
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177 |
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178 Octave_builtin_fcn_struct_fcn f = |
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179 (Octave_builtin_fcn_struct_fcn) resolve_octave_reference |
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180 (mangled_name, oct_file); |
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181 |
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182 if (f) |
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183 { |
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184 builtin_function *s = f (); |
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185 |
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186 if (s) |
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187 { |
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188 install_builtin_function (*s); |
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189 retval = 1; |
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190 } |
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191 } |
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192 } |
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193 |
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194 #else |
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195 |
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196 (void) name; |
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197 |
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198 #endif |
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199 |
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200 return retval; |
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201 } |
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202 |
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203 void |
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204 init_dynamic_linker (void) |
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205 { |
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206 // Nothing to do anymore... |
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207 } |
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208 |
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209 /* |
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210 ;;; Local Variables: *** |
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211 ;;; mode: C++ *** |
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212 ;;; End: *** |
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213 */ |
