annotate nspr/pr/include/prlink.h @ 4:b513267f632f tip

Build DBM module
author Andre Heinecke <andre.heinecke@intevation.de>
date Tue, 05 Aug 2014 18:58:03 +0200
parents 1e5118fa0cb1
children
rev   line source
0
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1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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2 /* This Source Code Form is subject to the terms of the Mozilla Public
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3 * License, v. 2.0. If a copy of the MPL was not distributed with this
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4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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5
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6 #ifndef prlink_h___
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7 #define prlink_h___
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8
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9 /*
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10 ** API to static and dynamic linking.
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11 */
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12 #include "prtypes.h"
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13
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14 PR_BEGIN_EXTERN_C
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15
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16 typedef struct PRLibrary PRLibrary;
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17
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18 typedef struct PRStaticLinkTable {
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19 const char *name;
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20 void (*fp)(void);
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21 } PRStaticLinkTable;
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22
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23 /*
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24 ** Change the default library path to the given string. The string is
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25 ** copied. This call will fail if it runs out of memory.
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26 **
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27 ** The string provided as 'path' is copied. The caller can do whatever is
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28 ** convenient with the argument when the function is complete.
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29 */
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30 NSPR_API(PRStatus) PR_SetLibraryPath(const char *path);
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31
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32 /*
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33 ** Return a character string which contains the path used to search for
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34 ** dynamically loadable libraries.
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35 **
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36 ** The returned value is basically a copy of a PR_SetLibraryPath().
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37 ** The storage is allocated by the runtime and becomes the responsibilty
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38 ** of the caller.
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39 */
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40 NSPR_API(char*) PR_GetLibraryPath(void);
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41
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42 /*
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43 ** Given a directory name "dir" and a library name "lib" construct a full
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44 ** path name that will refer to the actual dynamically loaded
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45 ** library. This does not test for existance of said file, it just
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46 ** constructs the full filename. The name constructed is system dependent
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47 ** and prepared for PR_LoadLibrary. The result must be free'd when the
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48 ** caller is done with it.
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49 **
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50 ** The storage for the result is allocated by the runtime and becomes the
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51 ** responsibility of the caller.
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52 */
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53 NSPR_API(char*) PR_GetLibraryName(const char *dir, const char *lib);
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54
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55 /*
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56 **
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57 ** Free the memory allocated, for the caller, by PR_GetLibraryName
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58 */
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59 NSPR_API(void) PR_FreeLibraryName(char *mem);
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60
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61 /*
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62 ** Given a library "name" try to load the library. The argument "name"
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63 ** is a machine-dependent name for the library, such as the full pathname
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64 ** returned by PR_GetLibraryName. If the library is already loaded,
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65 ** this function will avoid loading the library twice.
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66 **
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67 ** If the library is loaded successfully, then a pointer to the PRLibrary
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68 ** structure representing the library is returned. Otherwise, NULL is
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69 ** returned.
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70 **
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71 ** This increments the reference count of the library.
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72 */
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73 NSPR_API(PRLibrary*) PR_LoadLibrary(const char *name);
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74
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75 /*
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76 ** Each operating system has its preferred way of specifying
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77 ** a file in the file system. Most operating systems use
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78 ** a pathname. Mac OS Classic, on the other hand, uses the FSSpec
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79 ** structure to specify a file. PRLibSpec allows NSPR clients
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80 ** to use the type of file specification that is most efficient
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81 ** for a particular platform.
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82 **
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83 ** On some operating systems such as Mac OS Classic, a shared library
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84 ** may contain code fragments that can be individually loaded.
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85 ** PRLibSpec also allows NSPR clients to identify a code fragment
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86 ** in a library, if code fragments are supported by the OS.
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87 ** A code fragment can be specified by name or by an integer index.
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88 **
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89 ** Right now PRLibSpec supports four types of library specification:
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90 ** a pathname in the native character encoding, a Mac code fragment
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91 ** by name, a Mac code fragment by index, and a UTF-16 pathname.
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92 */
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93
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94 typedef enum PRLibSpecType {
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95 PR_LibSpec_Pathname,
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96 PR_LibSpec_MacNamedFragment, /* obsolete (for Mac OS Classic) */
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97 PR_LibSpec_MacIndexedFragment, /* obsolete (for Mac OS Classic) */
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98 PR_LibSpec_PathnameU /* supported only on Win32 */
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99 } PRLibSpecType;
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100
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101 struct FSSpec; /* Mac OS Classic FSSpec */
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102
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103 typedef struct PRLibSpec {
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104 PRLibSpecType type;
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105 union {
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106 /* if type is PR_LibSpec_Pathname */
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107 const char *pathname;
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108
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109 /* if type is PR_LibSpec_MacNamedFragment */
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110 struct {
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111 const struct FSSpec *fsspec;
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112 const char *name;
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113 } mac_named_fragment; /* obsolete (for Mac OS Classic) */
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114
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115 /* if type is PR_LibSpec_MacIndexedFragment */
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116 struct {
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117 const struct FSSpec *fsspec;
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118 PRUint32 index;
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119 } mac_indexed_fragment; /* obsolete (for Mac OS Classic) */
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120
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121 /* if type is PR_LibSpec_PathnameU */
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122 const PRUnichar *pathname_u; /* supported only on Win32 */
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123 } value;
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124 } PRLibSpec;
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125
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126 /*
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127 ** The following bit flags may be or'd together and passed
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128 ** as the 'flags' argument to PR_LoadLibraryWithFlags.
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129 ** Flags not supported by the underlying OS are ignored.
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130 */
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131
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132 #define PR_LD_LAZY 0x1 /* equivalent to RTLD_LAZY on Unix */
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133 #define PR_LD_NOW 0x2 /* equivalent to RTLD_NOW on Unix */
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134 #define PR_LD_GLOBAL 0x4 /* equivalent to RTLD_GLOBAL on Unix */
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135 #define PR_LD_LOCAL 0x8 /* equivalent to RTLD_LOCAL on Unix */
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136 /* The following is equivalent to LOAD_WITH_ALTERED_SEARCH_PATH on Windows */
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137 #define PR_LD_ALT_SEARCH_PATH 0x10
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138 /* 0x8000 reserved for NSPR internal use */
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139
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140 /*
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141 ** Load the specified library, in the manner specified by 'flags'.
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142 */
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143
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144 NSPR_API(PRLibrary *)
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145 PR_LoadLibraryWithFlags(
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146 PRLibSpec libSpec, /* the shared library */
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147 PRIntn flags /* flags that affect the loading */
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148 );
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149
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150 /*
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151 ** Unload a previously loaded library. If the library was a static
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152 ** library then the static link table will no longer be referenced. The
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153 ** associated PRLibrary object is freed.
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154 **
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155 ** PR_FAILURE is returned if the library cannot be unloaded.
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156 **
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157 ** This function decrements the reference count of the library.
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158 */
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159 NSPR_API(PRStatus) PR_UnloadLibrary(PRLibrary *lib);
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160
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161 /*
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162 ** Given the name of a procedure, return the address of the function that
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163 ** implements the procedure, or NULL if no such function can be
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164 ** found. This does not find symbols in the main program (the ".exe");
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165 ** use PR_LoadStaticLibrary to register symbols in the main program.
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166 **
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167 ** This function does not modify the reference count of the library.
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168 */
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169 NSPR_API(void*) PR_FindSymbol(PRLibrary *lib, const char *name);
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170
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171 /*
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172 ** Similar to PR_FindSymbol, except that the return value is a pointer to
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173 ** a function, and not a pointer to void. Casting between a data pointer
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174 ** and a function pointer is not portable according to the C standard.
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175 ** Any function pointer can be cast to any other function pointer.
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176 **
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177 ** This function does not modify the reference count of the library.
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178 */
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179 typedef void (*PRFuncPtr)(void);
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180 NSPR_API(PRFuncPtr) PR_FindFunctionSymbol(PRLibrary *lib, const char *name);
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181
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182 /*
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183 ** Finds a symbol in one of the currently loaded libraries. Given the
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184 ** name of a procedure, return the address of the function that
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185 ** implements the procedure, and return the library that contains that
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186 ** symbol, or NULL if no such function can be found. This does not find
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187 ** symbols in the main program (the ".exe"); use PR_AddStaticLibrary to
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188 ** register symbols in the main program.
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189 **
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190 ** This increments the reference count of the library.
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191 */
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192 NSPR_API(void*) PR_FindSymbolAndLibrary(const char *name,
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193 PRLibrary* *lib);
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194
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195 /*
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196 ** Similar to PR_FindSymbolAndLibrary, except that the return value is
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197 ** a pointer to a function, and not a pointer to void. Casting between a
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198 ** data pointer and a function pointer is not portable according to the C
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199 ** standard. Any function pointer can be cast to any other function pointer.
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200 **
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201 ** This increments the reference count of the library.
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202 */
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203 NSPR_API(PRFuncPtr) PR_FindFunctionSymbolAndLibrary(const char *name,
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204 PRLibrary* *lib);
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205
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206 /*
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207 ** Register a static link table with the runtime under the name
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208 ** "name". The symbols present in the static link table will be made
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209 ** available to PR_FindSymbol. If "name" is null then the symbols will be
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210 ** made available to the library which represents the executable. The
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211 ** tables are not copied.
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212 **
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213 ** Returns the library object if successful, null otherwise.
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214 **
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215 ** This increments the reference count of the library.
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216 */
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217 NSPR_API(PRLibrary*) PR_LoadStaticLibrary(
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218 const char *name, const PRStaticLinkTable *table);
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219
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220 /*
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221 ** Return the pathname of the file that the library "name" was loaded
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222 ** from. "addr" is the address of a function defined in the library.
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223 **
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224 ** The caller is responsible for freeing the result with PR_Free.
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225 */
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226 NSPR_API(char *) PR_GetLibraryFilePathname(const char *name, PRFuncPtr addr);
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227
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228 PR_END_EXTERN_C
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229
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230 #endif /* prlink_h___ */
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