Mercurial > trustbridge > nss-cmake-static
annotate nspr/pr/src/io/prpolevt.c @ 0:1e5118fa0cb1
This is NSS with a Cmake Buildsyste
To compile a static NSS library for Windows we've used the
Chromium-NSS fork and added a Cmake buildsystem to compile
it statically for Windows. See README.chromium for chromium
changes and README.trustbridge for our modifications.
author | Andre Heinecke <andre.heinecke@intevation.de> |
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date | Mon, 28 Jul 2014 10:47:06 +0200 |
parents | |
children |
rev | line source |
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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 ********************************************************************* |
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8 * |
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9 * Pollable events |
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10 * |
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11 * Pollable events are implemented using layered I/O. The only |
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12 * I/O methods that are implemented for pollable events are poll |
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13 * and close. No other methods can be invoked on a pollable |
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14 * event. |
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15 * |
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16 * A pipe or socket pair is created and the pollable event layer |
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17 * is pushed onto the read end. A pointer to the write end is |
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18 * saved in the PRFilePrivate structure of the pollable event. |
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19 * |
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20 ********************************************************************* |
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21 */ |
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22 |
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23 #include "prinit.h" |
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24 #include "prio.h" |
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25 #include "prmem.h" |
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26 #include "prerror.h" |
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27 #include "prlog.h" |
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28 |
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29 /* |
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30 * These internal functions are declared in primpl.h, |
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31 * but we can't include primpl.h because the definition |
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32 * of struct PRFilePrivate in this file (for the pollable |
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33 * event layer) will conflict with the definition of |
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34 * struct PRFilePrivate in primpl.h (for the NSPR layer). |
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35 */ |
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36 extern PRIntn _PR_InvalidInt(void); |
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37 extern PRInt64 _PR_InvalidInt64(void); |
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38 extern PRStatus _PR_InvalidStatus(void); |
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39 extern PRFileDesc *_PR_InvalidDesc(void); |
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40 |
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41 /* |
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42 * PRFilePrivate structure for the NSPR pollable events layer |
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43 */ |
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44 struct PRFilePrivate { |
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45 PRFileDesc *writeEnd; /* the write end of the pipe/socketpair */ |
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46 }; |
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47 |
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48 static PRStatus PR_CALLBACK _pr_PolEvtClose(PRFileDesc *fd); |
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49 |
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50 static PRInt16 PR_CALLBACK _pr_PolEvtPoll( |
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51 PRFileDesc *fd, PRInt16 in_flags, PRInt16 *out_flags); |
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52 |
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53 static PRIOMethods _pr_polevt_methods = { |
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54 PR_DESC_LAYERED, |
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55 _pr_PolEvtClose, |
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56 (PRReadFN)_PR_InvalidInt, |
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57 (PRWriteFN)_PR_InvalidInt, |
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58 (PRAvailableFN)_PR_InvalidInt, |
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59 (PRAvailable64FN)_PR_InvalidInt64, |
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60 (PRFsyncFN)_PR_InvalidStatus, |
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61 (PRSeekFN)_PR_InvalidInt, |
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62 (PRSeek64FN)_PR_InvalidInt64, |
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63 (PRFileInfoFN)_PR_InvalidStatus, |
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64 (PRFileInfo64FN)_PR_InvalidStatus, |
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65 (PRWritevFN)_PR_InvalidInt, |
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66 (PRConnectFN)_PR_InvalidStatus, |
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67 (PRAcceptFN)_PR_InvalidDesc, |
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68 (PRBindFN)_PR_InvalidStatus, |
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69 (PRListenFN)_PR_InvalidStatus, |
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70 (PRShutdownFN)_PR_InvalidStatus, |
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71 (PRRecvFN)_PR_InvalidInt, |
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72 (PRSendFN)_PR_InvalidInt, |
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73 (PRRecvfromFN)_PR_InvalidInt, |
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74 (PRSendtoFN)_PR_InvalidInt, |
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75 _pr_PolEvtPoll, |
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76 (PRAcceptreadFN)_PR_InvalidInt, |
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77 (PRTransmitfileFN)_PR_InvalidInt, |
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78 (PRGetsocknameFN)_PR_InvalidStatus, |
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79 (PRGetpeernameFN)_PR_InvalidStatus, |
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80 (PRReservedFN)_PR_InvalidInt, |
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81 (PRReservedFN)_PR_InvalidInt, |
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82 (PRGetsocketoptionFN)_PR_InvalidStatus, |
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83 (PRSetsocketoptionFN)_PR_InvalidStatus, |
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84 (PRSendfileFN)_PR_InvalidInt, |
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85 (PRConnectcontinueFN)_PR_InvalidStatus, |
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86 (PRReservedFN)_PR_InvalidInt, |
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87 (PRReservedFN)_PR_InvalidInt, |
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88 (PRReservedFN)_PR_InvalidInt, |
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89 (PRReservedFN)_PR_InvalidInt |
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90 }; |
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91 |
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92 static PRDescIdentity _pr_polevt_id; |
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93 static PRCallOnceType _pr_polevt_once_control; |
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94 static PRStatus PR_CALLBACK _pr_PolEvtInit(void); |
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95 |
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96 static PRInt16 PR_CALLBACK _pr_PolEvtPoll( |
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97 PRFileDesc *fd, PRInt16 in_flags, PRInt16 *out_flags) |
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98 { |
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99 return (fd->lower->methods->poll)(fd->lower, in_flags, out_flags); |
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100 } |
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101 |
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102 static PRStatus PR_CALLBACK _pr_PolEvtInit(void) |
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103 { |
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104 _pr_polevt_id = PR_GetUniqueIdentity("NSPR pollable events"); |
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105 if (PR_INVALID_IO_LAYER == _pr_polevt_id) { |
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106 return PR_FAILURE; |
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107 } |
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108 return PR_SUCCESS; |
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109 } |
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110 |
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111 #if !defined(XP_UNIX) |
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112 #define USE_TCP_SOCKETPAIR |
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113 #endif |
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114 |
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115 PR_IMPLEMENT(PRFileDesc *) PR_NewPollableEvent(void) |
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116 { |
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117 PRFileDesc *event; |
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118 PRFileDesc *fd[2]; /* fd[0] is the read end; fd[1] is the write end */ |
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119 #ifdef USE_TCP_SOCKETPAIR |
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120 PRSocketOptionData socket_opt; |
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121 PRStatus rv; |
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122 #endif |
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123 |
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124 fd[0] = fd[1] = NULL; |
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125 |
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126 if (PR_CallOnce(&_pr_polevt_once_control, _pr_PolEvtInit) == PR_FAILURE) { |
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127 return NULL; |
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128 } |
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129 |
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130 event = PR_CreateIOLayerStub(_pr_polevt_id, &_pr_polevt_methods); |
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131 if (NULL == event) { |
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132 goto errorExit; |
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133 } |
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134 event->secret = PR_NEW(PRFilePrivate); |
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135 if (event->secret == NULL) { |
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136 PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0); |
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137 goto errorExit; |
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138 } |
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139 |
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140 #ifndef USE_TCP_SOCKETPAIR |
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141 if (PR_CreatePipe(&fd[0], &fd[1]) == PR_FAILURE) { |
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142 fd[0] = fd[1] = NULL; |
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143 goto errorExit; |
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144 } |
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145 #else |
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146 if (PR_NewTCPSocketPair(fd) == PR_FAILURE) { |
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147 fd[0] = fd[1] = NULL; |
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148 goto errorExit; |
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149 } |
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150 /* |
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151 * set the TCP_NODELAY option to reduce notification latency |
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152 */ |
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153 socket_opt.option = PR_SockOpt_NoDelay; |
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154 socket_opt.value.no_delay = PR_TRUE; |
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155 rv = PR_SetSocketOption(fd[1], &socket_opt); |
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156 PR_ASSERT(PR_SUCCESS == rv); |
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157 #endif |
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158 |
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159 event->secret->writeEnd = fd[1]; |
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160 if (PR_PushIOLayer(fd[0], PR_TOP_IO_LAYER, event) == PR_FAILURE) { |
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161 goto errorExit; |
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162 } |
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163 |
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164 return fd[0]; |
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165 |
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166 errorExit: |
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167 if (fd[0]) { |
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168 PR_Close(fd[0]); |
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169 PR_Close(fd[1]); |
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170 } |
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171 if (event) { |
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172 PR_DELETE(event->secret); |
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173 event->dtor(event); |
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174 } |
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175 return NULL; |
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176 } |
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177 |
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178 static PRStatus PR_CALLBACK _pr_PolEvtClose(PRFileDesc *fd) |
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179 { |
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180 PRFileDesc *event; |
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181 |
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182 event = PR_PopIOLayer(fd, PR_TOP_IO_LAYER); |
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183 PR_ASSERT(NULL == event->higher && NULL == event->lower); |
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184 PR_Close(fd); |
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185 PR_Close(event->secret->writeEnd); |
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186 PR_DELETE(event->secret); |
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187 event->dtor(event); |
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188 return PR_SUCCESS; |
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189 } |
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190 |
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191 PR_IMPLEMENT(PRStatus) PR_DestroyPollableEvent(PRFileDesc *event) |
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192 { |
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193 return PR_Close(event); |
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194 } |
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195 |
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196 static const char magicChar = '\x38'; |
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197 |
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198 PR_IMPLEMENT(PRStatus) PR_SetPollableEvent(PRFileDesc *event) |
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199 { |
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200 if (PR_Write(event->secret->writeEnd, &magicChar, 1) != 1) { |
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201 return PR_FAILURE; |
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202 } |
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203 return PR_SUCCESS; |
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204 } |
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205 |
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206 PR_IMPLEMENT(PRStatus) PR_WaitForPollableEvent(PRFileDesc *event) |
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207 { |
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208 char buf[1024]; |
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209 PRInt32 nBytes; |
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210 #ifdef DEBUG |
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211 PRIntn i; |
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212 #endif |
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213 |
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214 nBytes = PR_Read(event->lower, buf, sizeof(buf)); |
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215 if (nBytes == -1) { |
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216 return PR_FAILURE; |
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217 } |
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218 |
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219 #ifdef DEBUG |
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220 /* |
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221 * Make sure people do not write to the pollable event fd |
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222 * directly. |
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223 */ |
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224 for (i = 0; i < nBytes; i++) { |
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225 PR_ASSERT(buf[i] == magicChar); |
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226 } |
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227 #endif |
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228 |
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229 return PR_SUCCESS; |
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230 } |