Mercurial > trustbridge > nss-cmake-static

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

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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 /*
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7 ** prshma.h -- NSPR Anonymous Shared Memory
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8 **
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9 ** NSPR provides an anonymous shared memory based on NSPR's PRFileMap
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10 ** type. The anonymous file-mapped shared memory provides an inheritable
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11 ** shared memory, as in: the child process inherits the shared memory.
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12 ** Compare the file-mapped anonymous shared memory to to a named shared
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13 ** memory described in prshm.h. The intent is to provide a shared
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14 ** memory that is accessable only by parent and child processes. ...
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15 ** It's a security thing.
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16 **
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17 ** Depending on the underlying platform, the file-mapped shared memory
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18 ** may be backed by a file. ... surprise! ... On some platforms, no
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19 ** real file backs the shared memory. On platforms where the shared
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20 ** memory is backed by a file, the file's name in the filesystem is
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21 ** visible to other processes for only the duration of the creation of
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22 ** the file, hopefully a very short time. This restricts processess
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23 ** that do not inherit the shared memory from opening the file and
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24 ** reading or writing its contents. Further, when all processes
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25 ** using an anonymous shared memory terminate, the backing file is
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26 ** deleted. ... If you are not paranoid, you're not paying attention.
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27 **
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28 ** The file-mapped shared memory requires a protocol for the parent
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29 ** process and child process to share the memory. NSPR provides two
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30 ** protocols. Use one or the other; don't mix and match.
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31 **
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32 ** In the first protocol, the job of passing the inheritable shared
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33 ** memory is done via helper-functions with PR_CreateProcess(). In the
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34 ** second protocol, the parent process is responsible for creating the
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35 ** child process; the parent and child are mutually responsible for
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36 ** passing a FileMap string. NSPR provides helper functions for
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37 ** extracting data from the PRFileMap object. ... See the examples
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38 ** below.
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39 **
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40 ** Both sides should adhere strictly to the protocol for proper
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41 ** operation. The pseudo-code below shows the use of a file-mapped
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42 ** shared memory by a parent and child processes. In the examples, the
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43 ** server creates the file-mapped shared memory, the client attaches to
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44 ** it.
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45 **
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46 ** First protocol.
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47 ** Server:
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48 **
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49 ** fm = PR_OpenAnonFileMap(dirName, size, FilemapProt);
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50 ** addr = PR_MemMap(fm);
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51 ** attr = PR_NewProcessAttr();
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52 ** PR_ProcessAttrSetInheritableFileMap( attr, fm, shmname );
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53 ** PR_CreateProcess(Client);
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54 ** PR_DestroyProcessAttr(attr);
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55 ** ... yadda ...
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56 ** PR_MemUnmap( addr );
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57 ** PR_CloseFileMap(fm);
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58 **
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59 **
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60 ** Client:
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61 ** ... started by server via PR_CreateProcess()
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62 ** fm = PR_GetInheritedFileMap( shmname );
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63 ** addr = PR_MemMap(fm);
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64 ** ... yadda ...
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65 ** PR_MemUnmap(addr);
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66 ** PR_CloseFileMap(fm);
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67 **
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68 **
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69 ** Second Protocol:
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70 ** Server:
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71 **
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72 ** fm = PR_OpenAnonFileMap(dirName, size, FilemapProt);
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73 ** fmstring = PR_ExportFileMapAsString( fm );
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74 ** addr = PR_MemMap(fm);
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75 ** ... application specific technique to pass fmstring to child
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76 ** ... yadda ... Server uses his own magic to create child
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77 ** PR_MemUnmap( addr );
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78 ** PR_CloseFileMap(fm);
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79 **
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80 **
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81 ** Client:
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82 ** ... started by server via his own magic
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83 ** ... application specific technique to find fmstring from parent
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84 ** fm = PR_ImportFileMapFromString( fmstring )
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85 ** addr = PR_MemMap(fm);
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86 ** ... yadda ...
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87 ** PR_MemUnmap(addr);
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88 ** PR_CloseFileMap(fm);
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89 **
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90 **
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91 ** lth. 2-Jul-1999.
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92 **
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93 ** Note: The second protocol was requested by NelsonB (7/1999); this is
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94 ** to accomodate servers which already create their own child processes
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95 ** using platform native methods.
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96 **
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97 */
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98
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99 #ifndef prshma_h___
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100 #define prshma_h___
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101
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102 #include "prtypes.h"
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103 #include "prio.h"
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104 #include "prproces.h"
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105
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106 PR_BEGIN_EXTERN_C
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107
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108 /*
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109 ** PR_OpenAnonFileMap() -- Creates an anonymous file-mapped shared memory
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110 **
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111 ** Description:
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112 ** PR_OpenAnonFileMap() creates an anonymous shared memory. If the
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113 ** shared memory already exists, a handle is returned to that shared
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114 ** memory object.
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115 **
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116 ** On Unix platforms, PR_OpenAnonFileMap() uses 'dirName' as a
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117 ** directory name, without the trailing '/', to contain the anonymous
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118 ** file. A filename is generated for the name.
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119 **
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120 ** On Windows platforms, dirName is ignored.
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121 **
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122 ** Inputs:
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123 ** dirName -- A directory name to contain the anonymous file.
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124 ** size -- The size of the shared memory
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125 ** prot -- How the shared memory is mapped. See prio.h
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126 **
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127 ** Outputs:
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128 ** PRFileMap *
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129 **
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130 ** Returns:
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131 ** Pointer to PRFileMap or NULL on error.
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132 **
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133 */
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134 NSPR_API( PRFileMap *)
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135 PR_OpenAnonFileMap(
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136 const char *dirName,
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137 PRSize size,
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138 PRFileMapProtect prot
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139 );
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140
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141 /*
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142 ** PR_ProcessAttrSetInheritableFileMap() -- Prepare FileMap for export
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143 ** to my children processes via PR_CreateProcess()
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144 **
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145 ** Description:
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146 ** PR_ProcessAttrSetInheritableFileMap() connects the PRFileMap to
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147 ** PRProcessAttr with shmname. A subsequent call to PR_CreateProcess()
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148 ** makes the PRFileMap importable by the child process.
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149 **
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150 ** Inputs:
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151 ** attr -- PRProcessAttr, used to pass data to PR_CreateProcess()
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152 ** fm -- PRFileMap structure to be passed to the child process
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153 ** shmname -- The name for the PRFileMap; used by child.
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154 **
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155 ** Outputs:
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156 ** PRFileMap *
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157 **
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158 ** Returns:
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159 ** PRStatus
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160 **
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161 */
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162 NSPR_API(PRStatus)
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163 PR_ProcessAttrSetInheritableFileMap(
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164 PRProcessAttr *attr,
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165 PRFileMap *fm,
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166 const char *shmname
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167 );
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168
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169 /*
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170 ** PR_GetInheritedFileMap() -- Import a PRFileMap previously exported
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171 ** by my parent process via PR_CreateProcess()
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172 **
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173 ** Description:
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174 ** PR_GetInheritedFileMap() retrieves a PRFileMap object exported from
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175 ** its parent process via PR_CreateProcess().
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176 **
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177 ** Inputs:
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178 ** shmname -- The name provided to PR_ProcessAttrSetInheritableFileMap()
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179 **
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180 ** Outputs:
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181 ** PRFileMap *
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182 **
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183 ** Returns:
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184 ** PRFileMap pointer or NULL.
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185 **
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186 */
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187 NSPR_API( PRFileMap *)
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188 PR_GetInheritedFileMap(
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189 const char *shmname
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190 );
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191
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192 /*
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193 ** PR_ExportFileMapAsString() -- Creates a string identifying a PRFileMap
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194 **
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195 ** Description:
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196 ** Creates an identifier, as a string, from a PRFileMap object
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197 ** previously created with PR_OpenAnonFileMap().
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198 **
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199 ** Inputs:
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200 ** fm -- PRFileMap pointer to be represented as a string.
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201 ** bufsize -- sizeof(buf)
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202 ** buf -- a buffer of length PR_FILEMAP_STRING_BUFSIZE
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203 **
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204 ** Outputs:
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205 ** buf contains the stringized PRFileMap identifier
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206 **
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207 ** Returns:
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208 ** PRStatus
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209 **
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210 */
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211 NSPR_API( PRStatus )
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212 PR_ExportFileMapAsString(
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213 PRFileMap *fm,
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214 PRSize bufsize,
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215 char *buf
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216 );
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217 #define PR_FILEMAP_STRING_BUFSIZE 128
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218
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219 /*
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220 ** PR_ImportFileMapFromString() -- Creates a PRFileMap from the identifying string
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221 **
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222 ** Description:
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223 ** PR_ImportFileMapFromString() creates a PRFileMap object from a
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224 ** string previously created by PR_ExportFileMapAsString().
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225 **
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226 ** Inputs:
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227 ** fmstring -- string created by PR_ExportFileMapAsString()
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228 **
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229 ** Returns:
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230 ** PRFileMap pointer or NULL.
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231 **
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232 */
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233 NSPR_API( PRFileMap * )
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234 PR_ImportFileMapFromString(
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235 const char *fmstring
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236 );
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237
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238 PR_END_EXTERN_C
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239 #endif /* prshma_h___ */
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