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1 /* GMODULE - GLIB wrapper code for dynamic module loading |
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2 * Copyright (C) 1998, 2000 Tim Janik |
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3 * Portions copyright (c) 2006-2009 Nokia Corporation. All rights reserved. |
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4 * This library is free software; you can redistribute it and/or |
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5 * modify it under the terms of the GNU Lesser General Public |
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6 * License as published by the Free Software Foundation; either |
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7 * version 2 of the License, or (at your option) any later version. |
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8 * |
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9 * This library is distributed in the hope that it will be useful, |
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10 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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12 * Lesser General Public License for more details. |
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13 * |
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14 * You should have received a copy of the GNU Lesser General Public |
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15 * License along with this library; if not, write to the |
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16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
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17 * Boston, MA 02111-1307, USA. |
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18 */ |
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19 |
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20 /* |
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21 * Modified by the GLib Team and others 1997-2000. See the AUTHORS |
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22 * file for a list of people on the GLib Team. See the ChangeLog |
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23 * files for a list of changes. These files are distributed with |
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24 * GLib at ftp://ftp.gtk.org/pub/gtk/. |
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25 */ |
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26 |
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27 /* |
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28 * MT safe |
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29 */ |
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30 #include "config.h" |
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31 |
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32 #include <dlfcn.h> |
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33 |
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34 /* Perl includes <nlist.h> and <link.h> instead of <dlfcn.h> on some systmes? */ |
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35 |
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36 |
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37 /* dlerror() is not implemented on all systems |
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38 */ |
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39 #ifndef G_MODULE_HAVE_DLERROR |
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40 # ifdef __NetBSD__ |
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41 # define dlerror() g_strerror (errno) |
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42 # else /* !__NetBSD__ */ |
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43 /* could we rely on errno's state here? */ |
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44 # define dlerror() "unknown dl-error" |
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45 # endif /* !__NetBSD__ */ |
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46 #endif /* G_MODULE_HAVE_DLERROR */ |
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47 |
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48 /* some flags are missing on some systems, so we provide |
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49 * harmless defaults. |
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50 * The Perl sources say, RTLD_LAZY needs to be defined as (1), |
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51 * at least for Solaris 1. |
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52 * |
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53 * Mandatory: |
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54 * RTLD_LAZY - resolve undefined symbols as code from the dynamic library |
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55 * is executed. |
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56 * RTLD_NOW - resolve all undefined symbols before dlopen returns, and fail |
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57 * if this cannot be done. |
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58 * Optionally: |
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59 * RTLD_GLOBAL - the external symbols defined in the library will be made |
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60 * available to subsequently loaded libraries. |
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61 */ |
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62 #ifndef RTLD_LAZY |
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63 #define RTLD_LAZY 1 |
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64 #endif /* RTLD_LAZY */ |
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65 #ifndef RTLD_NOW |
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66 #define RTLD_NOW 0 |
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67 #endif /* RTLD_NOW */ |
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68 /* some systems (OSF1 V5.0) have broken RTLD_GLOBAL linkage */ |
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69 #ifdef G_MODULE_BROKEN_RTLD_GLOBAL |
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70 #undef RTLD_GLOBAL |
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71 #endif /* G_MODULE_BROKEN_RTLD_GLOBAL */ |
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72 #ifndef RTLD_GLOBAL |
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73 #define RTLD_GLOBAL 0 |
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74 #endif /* RTLD_GLOBAL */ |
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75 |
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76 |
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77 /* --- functions --- */ |
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78 static gchar* |
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79 fetch_dlerror (gboolean replace_null) |
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80 { |
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81 gchar *msg = dlerror (); |
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82 |
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83 /* make sure we always return an error message != NULL, if |
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84 * expected to do so. */ |
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85 |
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86 if (!msg && replace_null) |
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87 return "unknown dl-error"; |
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88 |
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89 return msg; |
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90 } |
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91 |
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92 static gpointer |
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93 _g_module_open (const gchar *file_name, |
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94 gboolean bind_lazy, |
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95 gboolean bind_local) |
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96 { |
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97 gpointer handle; |
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98 |
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99 handle = dlopen (file_name, |
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100 (bind_local ? 0 : RTLD_GLOBAL) | (bind_lazy ? RTLD_LAZY : RTLD_NOW)); |
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101 if (!handle) |
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102 g_module_set_error (fetch_dlerror (TRUE)); |
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103 |
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104 return handle; |
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105 } |
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106 |
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107 static gpointer |
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108 _g_module_self (void) |
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109 { |
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110 gpointer handle; |
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111 |
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112 /* to query symbols from the program itself, special link options |
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113 * are required on some systems. |
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114 */ |
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115 |
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116 handle = dlopen (NULL, RTLD_GLOBAL | RTLD_LAZY); |
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117 if (!handle) |
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118 g_module_set_error (fetch_dlerror (TRUE)); |
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119 |
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120 return handle; |
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121 } |
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122 |
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123 static void |
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124 _g_module_close (gpointer handle, |
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125 gboolean is_unref) |
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126 { |
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127 /* are there any systems out there that have dlopen()/dlclose() |
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128 * without a reference count implementation? |
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129 */ |
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130 is_unref |= 1; |
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131 |
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132 if (is_unref) |
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133 { |
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134 if (dlclose (handle) != 0) |
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135 g_module_set_error (fetch_dlerror (TRUE)); |
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136 } |
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137 } |
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138 |
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139 static gpointer |
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140 _g_module_symbol (gpointer handle, |
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141 const gchar *symbol_name) |
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142 { |
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143 gpointer p; |
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144 gchar *msg; |
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145 |
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146 fetch_dlerror (FALSE); |
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147 p = dlsym (handle, symbol_name); |
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148 msg = fetch_dlerror (FALSE); |
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149 if (msg) |
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150 g_module_set_error (msg); |
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151 |
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152 return p; |
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153 } |
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154 |
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155 static gchar* |
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156 _g_module_build_path (const gchar *directory, |
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157 const gchar *module_name) |
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158 { |
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159 if (directory && *directory) { |
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160 #ifdef __SYMBIAN32__ |
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161 return g_strconcat (directory, "\\", module_name, "." G_MODULE_SUFFIX, NULL); |
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162 #else |
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163 if (strncmp (module_name, "lib", 3) == 0) |
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164 return g_strconcat (directory, "/", module_name, NULL); |
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165 else |
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166 return g_strconcat (directory, "/lib", module_name, "." G_MODULE_SUFFIX, NULL); |
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167 #endif /* __SYMBIAN32__ */ |
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168 } else if (strncmp (module_name, "lib", 3) == 0) |
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169 return g_strdup (module_name); |
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170 else |
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171 #ifdef __SYMBIAN32__ |
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172 return g_strconcat (module_name, "." G_MODULE_SUFFIX, NULL); |
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173 #else |
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174 return g_strconcat ("lib", module_name, "." G_MODULE_SUFFIX, NULL); |
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175 #endif /* __SYMBIAN32__ */ |
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176 } |