<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" lang="en_US" xml:lang="en_US"> <head> <title>kdecore: klockfile.cpp Source File (kdecore)</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta http-equiv="Content-Style-Type" content="text/css" /> <meta http-equiv="pics-label" content='(pics-1.1 "http://www.icra.org/ratingsv02.html" comment "ICRAonline DE v2.0" l gen true for "http://www.kde.org" r (nz 1 vz 1 lz 1 oz 1 cb 1) "http://www.rsac.org/ratingsv01.html" l gen true for "http://www.kde.org" r (n 0 s 0 v 0 l 0))' /> <meta name="trademark" content="KDE e.V." /> <meta name="description" content="K Desktop Environment Homepage, KDE.org" /> <meta name="MSSmartTagsPreventParsing" content="true" /> <meta name="robots" content="all" /> <link rel="shortcut icon" href="../../favicon.ico" /> <link rel="stylesheet" media="screen" type="text/css" title="APIDOX" href="doxygen.css" /> </head> <body> <div id="nav_header_top" align="right"> <a href="#content" class="doNotDisplay" accesskey="2">Skip to main content ::</a> <a href="../.."><img id="nav_header_logo" alt="Home" align="left" src="../../kde_gear_64.png" border="0" /></a> <span class="doNotDisplay">::</span> <div id="nav_header_title" align="left">KDE API Reference</div> </div> <div id="nav_header_bottom" align="right"> <span class="doNotDisplay">:: <a href="#navigation" accesskey="5">Skip to Link Menu</a><br/></span> <div id="nav_header_bottom_right" style="text-align: left;"> / <a href="../..">API Reference</a> / <a href=".">kdecore</a> </div> </div> <table id="main" border="0" cellpadding="0" cellspacing="0" width="100%"> <tr> <td valign="top" class="menuheader" height="0"></td> <td id="contentcolumn" valign="top" rowspan="2" > <div id="content" style="padding-top: 0px;"><div style="width:100%; margin: 0px; padding: 0px;"> <a name="content"></a> <!-- Generated by Doxygen 1.5.5 --> <h1>klockfile.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span> <a name="l00002"></a>00002 <span class="comment"> This file is part of the KDE libraries</span> <a name="l00003"></a>00003 <span class="comment"> Copyright (c) 2004 Waldo Bastian <bastian@kde.org></span> <a name="l00004"></a>00004 <span class="comment"> </span> <a name="l00005"></a>00005 <span class="comment"> This library is free software; you can redistribute it and/or</span> <a name="l00006"></a>00006 <span class="comment"> modify it under the terms of the GNU Library General Public</span> <a name="l00007"></a>00007 <span class="comment"> License version 2 as published by the Free Software Foundation.</span> <a name="l00008"></a>00008 <span class="comment"> </span> <a name="l00009"></a>00009 <span class="comment"> This library is distributed in the hope that it will be useful,</span> <a name="l00010"></a>00010 <span class="comment"> but WITHOUT ANY WARRANTY; without even the implied warranty of</span> <a name="l00011"></a>00011 <span class="comment"> MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</span> <a name="l00012"></a>00012 <span class="comment"> Library General Public License for more details.</span> <a name="l00013"></a>00013 <span class="comment"> </span> <a name="l00014"></a>00014 <span class="comment"> You should have received a copy of the GNU Library General Public License</span> <a name="l00015"></a>00015 <span class="comment"> along with this library; see the file COPYING.LIB. If not, write to</span> <a name="l00016"></a>00016 <span class="comment"> the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,</span> <a name="l00017"></a>00017 <span class="comment"> Boston, MA 02110-1301, USA.</span> <a name="l00018"></a>00018 <span class="comment">*/</span> <a name="l00019"></a>00019 <a name="l00020"></a>00020 <span class="preprocessor">#include <klockfile.h></span> <a name="l00021"></a>00021 <a name="l00022"></a>00022 <span class="preprocessor">#include <config.h></span> <a name="l00023"></a>00023 <a name="l00024"></a>00024 <span class="preprocessor">#include <sys/types.h></span> <a name="l00025"></a>00025 <span class="preprocessor">#ifdef HAVE_SYS_STAT_H</span> <a name="l00026"></a>00026 <span class="preprocessor"></span><span class="preprocessor">#include <sys/stat.h></span> <a name="l00027"></a>00027 <span class="preprocessor">#endif</span> <a name="l00028"></a>00028 <span class="preprocessor"></span><span class="preprocessor">#ifdef HAVE_SYS_TIME_H</span> <a name="l00029"></a>00029 <span class="preprocessor"></span><span class="preprocessor">#include <sys/time.h></span> <a name="l00030"></a>00030 <span class="preprocessor">#endif</span> <a name="l00031"></a>00031 <span class="preprocessor"></span><span class="preprocessor">#include <signal.h></span> <a name="l00032"></a>00032 <span class="preprocessor">#include <errno.h></span> <a name="l00033"></a>00033 <span class="preprocessor">#include <stdlib.h></span> <a name="l00034"></a>00034 <span class="preprocessor">#include <unistd.h></span> <a name="l00035"></a>00035 <a name="l00036"></a>00036 <span class="preprocessor">#include <qfile.h></span> <a name="l00037"></a>00037 <span class="preprocessor">#include <qtextstream.h></span> <a name="l00038"></a>00038 <a name="l00039"></a>00039 <span class="preprocessor">#include <kde_file.h></span> <a name="l00040"></a>00040 <span class="preprocessor">#include <kapplication.h></span> <a name="l00041"></a>00041 <span class="preprocessor">#include <kcmdlineargs.h></span> <a name="l00042"></a>00042 <span class="preprocessor">#include <kglobal.h></span> <a name="l00043"></a>00043 <span class="preprocessor">#include <ktempfile.h></span> <a name="l00044"></a>00044 <a name="l00045"></a>00045 <span class="comment">// TODO: http://www.spinnaker.de/linux/nfs-locking.html</span> <a name="l00046"></a>00046 <span class="comment">// TODO: Make regression test</span> <a name="l00047"></a>00047 <a name="l00048"></a>00048 <span class="keyword">class </span>KLockFile::KLockFilePrivate { <a name="l00049"></a>00049 <span class="keyword">public</span>: <a name="l00050"></a>00050 <a class="codeRef" doxygen="qt.tag:/usr/lib/qt3/doc/html/" href="/usr/lib/qt3/doc/html/qstring.html">QString</a> file; <a name="l00051"></a>00051 <span class="keywordtype">int</span> <a class="code" href="classKLockFile.html#beb3936b99951db25836b508040039f2" title="Return the time in seconds after which a lock is considered stale The default is...">staleTime</a>; <a name="l00052"></a>00052 <span class="keywordtype">bool</span> <a class="code" href="classKLockFile.html#55228ef3c8cf3fb7c460baaa647bf8d0" title="Returns whether the lock is held or not.">isLocked</a>; <a name="l00053"></a>00053 <span class="keywordtype">bool</span> recoverLock; <a name="l00054"></a>00054 <span class="keywordtype">bool</span> linkCountSupport; <a name="l00055"></a>00055 <a class="codeRef" doxygen="qt.tag:/usr/lib/qt3/doc/html/" href="/usr/lib/qt3/doc/html/qtime.html">QTime</a> staleTimer; <a name="l00056"></a>00056 KDE_struct_stat statBuf; <a name="l00057"></a>00057 <span class="keywordtype">int</span> pid; <a name="l00058"></a>00058 <a class="codeRef" doxygen="qt.tag:/usr/lib/qt3/doc/html/" href="/usr/lib/qt3/doc/html/qstring.html">QString</a> hostname; <a name="l00059"></a>00059 <a class="codeRef" doxygen="qt.tag:/usr/lib/qt3/doc/html/" href="/usr/lib/qt3/doc/html/qstring.html">QString</a> <a class="code" href="namespaceKNotifyClient.html#1eb3ef58f2ad2a74b5c88f54d68de022" title="Shortcut to KNotifyClient::Instance::current() :).">instance</a>; <a name="l00060"></a>00060 <a class="codeRef" doxygen="qt.tag:/usr/lib/qt3/doc/html/" href="/usr/lib/qt3/doc/html/qstring.html">QString</a> lockRecoverFile; <a name="l00061"></a>00061 }; <a name="l00062"></a>00062 <a name="l00063"></a>00063 <a name="l00064"></a>00064 <span class="comment">// 30 seconds</span> <a name="l00065"></a>00065 KLockFile::KLockFile(<span class="keyword">const</span> <a class="codeRef" doxygen="qt.tag:/usr/lib/qt3/doc/html/" href="/usr/lib/qt3/doc/html/qstring.html">QString</a> &file) <a name="l00066"></a>00066 { <a name="l00067"></a>00067 d = <span class="keyword">new</span> KLockFilePrivate(); <a name="l00068"></a>00068 d->file = file; <a name="l00069"></a>00069 d->staleTime = 30; <a name="l00070"></a>00070 d->isLocked = <span class="keyword">false</span>; <a name="l00071"></a>00071 d->recoverLock = <span class="keyword">false</span>; <a name="l00072"></a>00072 d->linkCountSupport = <span class="keyword">true</span>; <a name="l00073"></a>00073 } <a name="l00074"></a>00074 <a name="l00075"></a><a class="code" href="classKLockFile.html#24a98f493f2eedcab02306fbca9589b8">00075</a> <a class="code" href="classKLockFile.html#24a98f493f2eedcab02306fbca9589b8" title="Destroys the object, releasing the lock if held.">KLockFile::~KLockFile</a>() <a name="l00076"></a>00076 { <a name="l00077"></a>00077 <a class="code" href="classKLockFile.html#212b868e0b478e93088cbcc00f6365b9" title="Release the lock.">unlock</a>(); <a name="l00078"></a>00078 <span class="keyword">delete</span> d; <a name="l00079"></a>00079 } <a name="l00080"></a>00080 <a name="l00081"></a>00081 <span class="keywordtype">int</span> <a name="l00082"></a><a class="code" href="classKLockFile.html#beb3936b99951db25836b508040039f2">00082</a> <a class="code" href="classKLockFile.html#beb3936b99951db25836b508040039f2" title="Return the time in seconds after which a lock is considered stale The default is...">KLockFile::staleTime</a>()<span class="keyword"> const</span> <a name="l00083"></a>00083 <span class="keyword"></span>{ <a name="l00084"></a>00084 <span class="keywordflow">return</span> d->staleTime; <a name="l00085"></a>00085 } <a name="l00086"></a>00086 <a name="l00087"></a>00087 <a name="l00088"></a>00088 <span class="keywordtype">void</span> <a name="l00089"></a><a class="code" href="classKLockFile.html#b5509bdb49e10d57217dd5adb1cf2d93">00089</a> <a class="code" href="classKLockFile.html#b5509bdb49e10d57217dd5adb1cf2d93" title="Set the time in seconds after which a lock is considered stale.">KLockFile::setStaleTime</a>(<span class="keywordtype">int</span> _staleTime) <a name="l00090"></a>00090 { <a name="l00091"></a>00091 d->staleTime = _staleTime; <a name="l00092"></a>00092 } <a name="l00093"></a>00093 <a name="l00094"></a>00094 <span class="keyword">static</span> <span class="keywordtype">bool</span> statResultIsEqual(KDE_struct_stat &st_buf1, KDE_struct_stat &st_buf2) <a name="l00095"></a>00095 { <a name="l00096"></a>00096 <span class="preprocessor">#define FIELD_EQ(what) (st_buf1.what == st_buf2.what)</span> <a name="l00097"></a>00097 <span class="preprocessor"></span> <span class="keywordflow">return</span> FIELD_EQ(st_dev) && FIELD_EQ(st_ino) && <a name="l00098"></a>00098 FIELD_EQ(st_uid) && FIELD_EQ(st_gid) && FIELD_EQ(st_nlink); <a name="l00099"></a>00099 <span class="preprocessor">#undef FIELD_EQ</span> <a name="l00100"></a>00100 <span class="preprocessor"></span>} <a name="l00101"></a>00101 <a name="l00102"></a>00102 <span class="keyword">static</span> <span class="keywordtype">bool</span> testLinkCountSupport(<span class="keyword">const</span> <a class="codeRef" doxygen="qt.tag:/usr/lib/qt3/doc/html/" href="/usr/lib/qt3/doc/html/qcstring.html">QCString</a> &fileName) <a name="l00103"></a>00103 { <a name="l00104"></a>00104 KDE_struct_stat st_buf; <a name="l00105"></a>00105 <span class="comment">// Check if hardlinks raise the link count at all?</span> <a name="l00106"></a>00106 ::link( fileName, fileName+<span class="stringliteral">".test"</span> ); <a name="l00107"></a>00107 <span class="keywordtype">int</span> result = KDE_lstat( fileName, &st_buf ); <a name="l00108"></a>00108 ::unlink( fileName+<span class="stringliteral">".test"</span> ); <a name="l00109"></a>00109 <span class="keywordflow">return</span> ((result == 0) && (st_buf.st_nlink == 2)); <a name="l00110"></a>00110 } <a name="l00111"></a>00111 <a name="l00112"></a>00112 <span class="keyword">static</span> <a class="code" href="classKLockFile.html#203a10d820e8d2f2e750034bfaad300c" title="Possible return values of the lock function.">KLockFile::LockResult</a> lockFile(<span class="keyword">const</span> <a class="codeRef" doxygen="qt.tag:/usr/lib/qt3/doc/html/" href="/usr/lib/qt3/doc/html/qstring.html">QString</a> &lockFile, KDE_struct_stat &st_buf, <span class="keywordtype">bool</span> &linkCountSupport) <a name="l00113"></a>00113 { <a name="l00114"></a>00114 <a class="codeRef" doxygen="qt.tag:/usr/lib/qt3/doc/html/" href="/usr/lib/qt3/doc/html/qcstring.html">QCString</a> lockFileName = <a class="codeRef" doxygen="qt.tag:/usr/lib/qt3/doc/html/" href="/usr/lib/qt3/doc/html/qfile.html#encodeName">QFile::encodeName</a>( lockFile ); <a name="l00115"></a>00115 <span class="keywordtype">int</span> result = KDE_lstat( lockFileName, &st_buf ); <a name="l00116"></a>00116 <span class="keywordflow">if</span> (result == 0) <a name="l00117"></a>00117 <span class="keywordflow">return</span> <a class="code" href="classKLockFile.html#203a10d820e8d2f2e750034bfaad300c49f2dc19c3e4c75ddd5a8f27cb080c9a" title="The lock could not be acquired because it is held by another process.">KLockFile::LockFail</a>; <a name="l00118"></a>00118 <a name="l00119"></a>00119 <a class="code" href="classKTempFile.html" title="The KTempFile class creates and opens a unique file for temporary use.">KTempFile</a> uniqueFile(lockFile, QString::null, 0644); <a name="l00120"></a>00120 uniqueFile.setAutoDelete(<span class="keyword">true</span>); <a name="l00121"></a>00121 <span class="keywordflow">if</span> (uniqueFile.status() != 0) <a name="l00122"></a>00122 <span class="keywordflow">return</span> <a class="code" href="classKLockFile.html#203a10d820e8d2f2e750034bfaad300cd010bfac449a9e394a18ead1d6721198" title="The lock could not be acquired due to an error.">KLockFile::LockError</a>; <a name="l00123"></a>00123 <a name="l00124"></a>00124 <span class="keywordtype">char</span> hostname[256]; <a name="l00125"></a>00125 hostname[0] = 0; <a name="l00126"></a>00126 gethostname(hostname, 255); <a name="l00127"></a>00127 hostname[255] = 0; <a name="l00128"></a>00128 <a class="codeRef" doxygen="qt.tag:/usr/lib/qt3/doc/html/" href="/usr/lib/qt3/doc/html/qcstring.html">QCString</a> instanceName = <a class="code" href="classKCmdLineArgs.html#de69c956977ab5e1879f65c6fba8485a" title="Get the appname according to argv[0].">KCmdLineArgs::appName</a>(); <a name="l00129"></a>00129 <a name="l00130"></a>00130 (*(uniqueFile.textStream())) << <a class="codeRef" doxygen="qt.tag:/usr/lib/qt3/doc/html/" href="/usr/lib/qt3/doc/html/qstring.html#number">QString::number</a>(getpid()) << <a class="code" href="group__kdebug.html#g313d520ed8f8f6b46eeef22cfb3b082a" title="Does nothing.">endl</a> <a name="l00131"></a>00131 << instanceName << <a class="code" href="group__kdebug.html#g313d520ed8f8f6b46eeef22cfb3b082a" title="Does nothing.">endl</a> <a name="l00132"></a>00132 << hostname << <a class="code" href="group__kdebug.html#g313d520ed8f8f6b46eeef22cfb3b082a" title="Does nothing.">endl</a>; <a name="l00133"></a>00133 uniqueFile.close(); <a name="l00134"></a>00134 <a name="l00135"></a>00135 <a class="codeRef" doxygen="qt.tag:/usr/lib/qt3/doc/html/" href="/usr/lib/qt3/doc/html/qcstring.html">QCString</a> uniqueName = <a class="codeRef" doxygen="qt.tag:/usr/lib/qt3/doc/html/" href="/usr/lib/qt3/doc/html/qfile.html#encodeName">QFile::encodeName</a>( uniqueFile.name() ); <a name="l00136"></a>00136 <a name="l00137"></a>00137 <span class="preprocessor">#ifdef Q_OS_UNIX</span> <a name="l00138"></a>00138 <span class="preprocessor"></span> <span class="comment">// Create lock file</span> <a name="l00139"></a>00139 result = ::link( uniqueName, lockFileName ); <a name="l00140"></a>00140 <span class="keywordflow">if</span> (result != 0) <a name="l00141"></a>00141 <span class="keywordflow">return</span> <a class="code" href="classKLockFile.html#203a10d820e8d2f2e750034bfaad300cd010bfac449a9e394a18ead1d6721198" title="The lock could not be acquired due to an error.">KLockFile::LockError</a>; <a name="l00142"></a>00142 <a name="l00143"></a>00143 <span class="keywordflow">if</span> (!linkCountSupport) <a name="l00144"></a>00144 <span class="keywordflow">return</span> <a class="code" href="classKLockFile.html#203a10d820e8d2f2e750034bfaad300c8dc52ef59704840c2d65f9f27b8779f0" title="Lock was acquired successfully.">KLockFile::LockOK</a>; <a name="l00145"></a>00145 <span class="preprocessor">#else</span> <a name="l00146"></a>00146 <span class="preprocessor"></span> <span class="comment">//TODO for win32</span> <a name="l00147"></a>00147 <span class="keywordflow">return</span> <a class="code" href="classKLockFile.html#203a10d820e8d2f2e750034bfaad300c8dc52ef59704840c2d65f9f27b8779f0" title="Lock was acquired successfully.">KLockFile::LockOK</a>; <a name="l00148"></a>00148 <span class="preprocessor">#endif</span> <a name="l00149"></a>00149 <span class="preprocessor"></span> <a name="l00150"></a>00150 KDE_struct_stat st_buf2; <a name="l00151"></a>00151 result = KDE_lstat( uniqueName, &st_buf2 ); <a name="l00152"></a>00152 <span class="keywordflow">if</span> (result != 0) <a name="l00153"></a>00153 <span class="keywordflow">return</span> <a class="code" href="classKLockFile.html#203a10d820e8d2f2e750034bfaad300cd010bfac449a9e394a18ead1d6721198" title="The lock could not be acquired due to an error.">KLockFile::LockError</a>; <a name="l00154"></a>00154 <a name="l00155"></a>00155 result = KDE_lstat( lockFileName, &st_buf ); <a name="l00156"></a>00156 <span class="keywordflow">if</span> (result != 0) <a name="l00157"></a>00157 <span class="keywordflow">return</span> <a class="code" href="classKLockFile.html#203a10d820e8d2f2e750034bfaad300cd010bfac449a9e394a18ead1d6721198" title="The lock could not be acquired due to an error.">KLockFile::LockError</a>; <a name="l00158"></a>00158 <a name="l00159"></a>00159 <span class="keywordflow">if</span> (!statResultIsEqual(st_buf, st_buf2) || S_ISLNK(st_buf.st_mode) || S_ISLNK(st_buf2.st_mode)) <a name="l00160"></a>00160 { <a name="l00161"></a>00161 <span class="comment">// SMBFS supports hardlinks by copying the file, as a result the above test will always fail</span> <a name="l00162"></a>00162 <span class="keywordflow">if</span> ((st_buf.st_nlink == 1) && (st_buf2.st_nlink == 1) && (st_buf.st_ino != st_buf2.st_ino)) <a name="l00163"></a>00163 { <a name="l00164"></a>00164 linkCountSupport = testLinkCountSupport(uniqueName); <a name="l00165"></a>00165 <span class="keywordflow">if</span> (!linkCountSupport) <a name="l00166"></a>00166 <span class="keywordflow">return</span> <a class="code" href="classKLockFile.html#203a10d820e8d2f2e750034bfaad300c8dc52ef59704840c2d65f9f27b8779f0" title="Lock was acquired successfully.">KLockFile::LockOK</a>; <span class="comment">// Link count support is missing... assume everything is OK.</span> <a name="l00167"></a>00167 } <a name="l00168"></a>00168 <span class="keywordflow">return</span> <a class="code" href="classKLockFile.html#203a10d820e8d2f2e750034bfaad300c49f2dc19c3e4c75ddd5a8f27cb080c9a" title="The lock could not be acquired because it is held by another process.">KLockFile::LockFail</a>; <a name="l00169"></a>00169 } <a name="l00170"></a>00170 <a name="l00171"></a>00171 <span class="keywordflow">return</span> <a class="code" href="classKLockFile.html#203a10d820e8d2f2e750034bfaad300c8dc52ef59704840c2d65f9f27b8779f0" title="Lock was acquired successfully.">KLockFile::LockOK</a>; <a name="l00172"></a>00172 } <a name="l00173"></a>00173 <a name="l00174"></a>00174 <span class="keyword">static</span> <a class="code" href="classKLockFile.html#203a10d820e8d2f2e750034bfaad300c" title="Possible return values of the lock function.">KLockFile::LockResult</a> deleteStaleLock(<span class="keyword">const</span> <a class="codeRef" doxygen="qt.tag:/usr/lib/qt3/doc/html/" href="/usr/lib/qt3/doc/html/qstring.html">QString</a> &lockFile, KDE_struct_stat &st_buf, <span class="keywordtype">bool</span> &linkCountSupport) <a name="l00175"></a>00175 { <a name="l00176"></a>00176 <span class="comment">// This is dangerous, we could be deleting a new lock instead of</span> <a name="l00177"></a>00177 <span class="comment">// the old stale one, let's be very careful</span> <a name="l00178"></a>00178 <a name="l00179"></a>00179 <span class="comment">// Create temp file</span> <a name="l00180"></a>00180 <a class="code" href="classKTempFile.html" title="The KTempFile class creates and opens a unique file for temporary use.">KTempFile</a> ktmpFile(lockFile); <a name="l00181"></a>00181 <span class="keywordflow">if</span> (ktmpFile.status() != 0) <a name="l00182"></a>00182 <span class="keywordflow">return</span> <a class="code" href="classKLockFile.html#203a10d820e8d2f2e750034bfaad300cd010bfac449a9e394a18ead1d6721198" title="The lock could not be acquired due to an error.">KLockFile::LockError</a>; <a name="l00183"></a>00183 <a name="l00184"></a>00184 <a class="codeRef" doxygen="qt.tag:/usr/lib/qt3/doc/html/" href="/usr/lib/qt3/doc/html/qcstring.html">QCString</a> lckFile = <a class="codeRef" doxygen="qt.tag:/usr/lib/qt3/doc/html/" href="/usr/lib/qt3/doc/html/qfile.html#encodeName">QFile::encodeName</a>(lockFile); <a name="l00185"></a>00185 <a class="codeRef" doxygen="qt.tag:/usr/lib/qt3/doc/html/" href="/usr/lib/qt3/doc/html/qcstring.html">QCString</a> tmpFile = <a class="codeRef" doxygen="qt.tag:/usr/lib/qt3/doc/html/" href="/usr/lib/qt3/doc/html/qfile.html#encodeName">QFile::encodeName</a>(ktmpFile.name()); <a name="l00186"></a>00186 ktmpFile.close(); <a name="l00187"></a>00187 ktmpFile.unlink(); <a name="l00188"></a>00188 <a name="l00189"></a>00189 <span class="preprocessor">#ifdef Q_OS_UNIX</span> <a name="l00190"></a>00190 <span class="preprocessor"></span> <span class="comment">// link to lock file</span> <a name="l00191"></a>00191 <span class="keywordflow">if</span> (::link(lckFile, tmpFile) != 0) <a name="l00192"></a>00192 <span class="keywordflow">return</span> <a class="code" href="classKLockFile.html#203a10d820e8d2f2e750034bfaad300c49f2dc19c3e4c75ddd5a8f27cb080c9a" title="The lock could not be acquired because it is held by another process.">KLockFile::LockFail</a>; <span class="comment">// Try again later</span> <a name="l00193"></a>00193 <span class="preprocessor">#else</span> <a name="l00194"></a>00194 <span class="preprocessor"></span> <span class="comment">//TODO for win32</span> <a name="l00195"></a>00195 <span class="keywordflow">return</span> <a class="code" href="classKLockFile.html#203a10d820e8d2f2e750034bfaad300c8dc52ef59704840c2d65f9f27b8779f0" title="Lock was acquired successfully.">KLockFile::LockOK</a>; <a name="l00196"></a>00196 <span class="preprocessor">#endif</span> <a name="l00197"></a>00197 <span class="preprocessor"></span> <a name="l00198"></a>00198 <span class="comment">// check if link count increased with exactly one</span> <a name="l00199"></a>00199 <span class="comment">// and if the lock file still matches</span> <a name="l00200"></a>00200 KDE_struct_stat st_buf1; <a name="l00201"></a>00201 KDE_struct_stat st_buf2; <a name="l00202"></a>00202 memcpy(&st_buf1, &st_buf, <span class="keyword">sizeof</span>(KDE_struct_stat)); <a name="l00203"></a>00203 st_buf1.st_nlink++; <a name="l00204"></a>00204 <span class="keywordflow">if</span> ((KDE_lstat(tmpFile, &st_buf2) == 0) && statResultIsEqual(st_buf1, st_buf2)) <a name="l00205"></a>00205 { <a name="l00206"></a>00206 <span class="keywordflow">if</span> ((KDE_lstat(lckFile, &st_buf2) == 0) && statResultIsEqual(st_buf1, st_buf2)) <a name="l00207"></a>00207 { <a name="l00208"></a>00208 <span class="comment">// - - if yes, delete lock file, delete temp file, retry lock</span> <a name="l00209"></a>00209 qWarning(<span class="stringliteral">"WARNING: deleting stale lockfile %s"</span>, lckFile.data()); <a name="l00210"></a>00210 ::unlink(lckFile); <a name="l00211"></a>00211 ::unlink(tmpFile); <a name="l00212"></a>00212 <span class="keywordflow">return</span> <a class="code" href="classKLockFile.html#203a10d820e8d2f2e750034bfaad300c8dc52ef59704840c2d65f9f27b8779f0" title="Lock was acquired successfully.">KLockFile::LockOK</a>; <a name="l00213"></a>00213 } <a name="l00214"></a>00214 } <a name="l00215"></a>00215 <a name="l00216"></a>00216 <span class="comment">// SMBFS supports hardlinks by copying the file, as a result the above test will always fail</span> <a name="l00217"></a>00217 <span class="keywordflow">if</span> (linkCountSupport) <a name="l00218"></a>00218 { <a name="l00219"></a>00219 linkCountSupport = testLinkCountSupport(tmpFile); <a name="l00220"></a>00220 } <a name="l00221"></a>00221 <a name="l00222"></a>00222 <span class="keywordflow">if</span> (!linkCountSupport && <a name="l00223"></a>00223 (KDE_lstat(lckFile, &st_buf2) == 0) && <a name="l00224"></a>00224 statResultIsEqual(st_buf, st_buf2)) <a name="l00225"></a>00225 { <a name="l00226"></a>00226 <span class="comment">// Without support for link counts we will have a little race condition</span> <a name="l00227"></a>00227 qWarning(<span class="stringliteral">"WARNING: deleting stale lockfile %s"</span>, lckFile.data()); <a name="l00228"></a>00228 ::unlink(lckFile); <a name="l00229"></a>00229 ::unlink(tmpFile); <a name="l00230"></a>00230 <span class="keywordflow">return</span> <a class="code" href="classKLockFile.html#203a10d820e8d2f2e750034bfaad300c8dc52ef59704840c2d65f9f27b8779f0" title="Lock was acquired successfully.">KLockFile::LockOK</a>; <a name="l00231"></a>00231 } <a name="l00232"></a>00232 <a name="l00233"></a>00233 <span class="comment">// Failed to delete stale lock file</span> <a name="l00234"></a>00234 qWarning(<span class="stringliteral">"WARNING: Problem deleting stale lockfile %s"</span>, lckFile.data()); <a name="l00235"></a>00235 ::unlink(tmpFile); <a name="l00236"></a>00236 <span class="keywordflow">return</span> <a class="code" href="classKLockFile.html#203a10d820e8d2f2e750034bfaad300c49f2dc19c3e4c75ddd5a8f27cb080c9a" title="The lock could not be acquired because it is held by another process.">KLockFile::LockFail</a>; <a name="l00237"></a>00237 } <a name="l00238"></a>00238 <a name="l00239"></a>00239 <a name="l00240"></a><a class="code" href="classKLockFile.html#68bf44782459a13b78f797b8d50c5249">00240</a> <a class="code" href="classKLockFile.html#203a10d820e8d2f2e750034bfaad300c" title="Possible return values of the lock function.">KLockFile::LockResult</a> <a class="code" href="classKLockFile.html#68bf44782459a13b78f797b8d50c5249" title="Attempt to acquire the lock.">KLockFile::lock</a>(<span class="keywordtype">int</span> options) <a name="l00241"></a>00241 { <a name="l00242"></a>00242 <span class="keywordflow">if</span> (d->isLocked) <a name="l00243"></a>00243 <span class="keywordflow">return</span> <a class="code" href="classKLockFile.html#203a10d820e8d2f2e750034bfaad300c8dc52ef59704840c2d65f9f27b8779f0" title="Lock was acquired successfully.">KLockFile::LockOK</a>; <a name="l00244"></a>00244 <a name="l00245"></a>00245 <a class="code" href="classKLockFile.html#203a10d820e8d2f2e750034bfaad300c" title="Possible return values of the lock function.">KLockFile::LockResult</a> result; <a name="l00246"></a>00246 <span class="keywordtype">int</span> hardErrors = 5; <a name="l00247"></a>00247 <span class="keywordtype">int</span> n = 5; <a name="l00248"></a>00248 <span class="keywordflow">while</span>(<span class="keyword">true</span>) <a name="l00249"></a>00249 { <a name="l00250"></a>00250 KDE_struct_stat st_buf; <a name="l00251"></a>00251 result = lockFile(d->file, st_buf, d->linkCountSupport); <a name="l00252"></a>00252 <span class="keywordflow">if</span> (result == <a class="code" href="classKLockFile.html#203a10d820e8d2f2e750034bfaad300c8dc52ef59704840c2d65f9f27b8779f0" title="Lock was acquired successfully.">KLockFile::LockOK</a>) <a name="l00253"></a>00253 { <a name="l00254"></a>00254 d->staleTimer = <a class="codeRef" doxygen="qt.tag:/usr/lib/qt3/doc/html/" href="/usr/lib/qt3/doc/html/qtime.html">QTime</a>(); <a name="l00255"></a>00255 <span class="keywordflow">break</span>; <a name="l00256"></a>00256 } <a name="l00257"></a>00257 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (result == <a class="code" href="classKLockFile.html#203a10d820e8d2f2e750034bfaad300cd010bfac449a9e394a18ead1d6721198" title="The lock could not be acquired due to an error.">KLockFile::LockError</a>) <a name="l00258"></a>00258 { <a name="l00259"></a>00259 d->staleTimer = <a class="codeRef" doxygen="qt.tag:/usr/lib/qt3/doc/html/" href="/usr/lib/qt3/doc/html/qtime.html">QTime</a>(); <a name="l00260"></a>00260 <span class="keywordflow">if</span> (--hardErrors == 0) <a name="l00261"></a>00261 { <a name="l00262"></a>00262 <span class="keywordflow">break</span>; <a name="l00263"></a>00263 } <a name="l00264"></a>00264 } <a name="l00265"></a>00265 <span class="keywordflow">else</span> <span class="comment">// KLockFile::Fail</span> <a name="l00266"></a>00266 { <a name="l00267"></a>00267 <span class="keywordflow">if</span> (!d->staleTimer.isNull() && !statResultIsEqual(d->statBuf, st_buf)) <a name="l00268"></a>00268 d->staleTimer = <a class="codeRef" doxygen="qt.tag:/usr/lib/qt3/doc/html/" href="/usr/lib/qt3/doc/html/qtime.html">QTime</a>(); <a name="l00269"></a>00269 <a name="l00270"></a>00270 <span class="keywordflow">if</span> (!d->staleTimer.isNull()) <a name="l00271"></a>00271 { <a name="l00272"></a>00272 <span class="keywordtype">bool</span> isStale = <span class="keyword">false</span>; <a name="l00273"></a>00273 <span class="keywordflow">if</span> ((d->pid > 0) && !d->hostname.isEmpty()) <a name="l00274"></a>00274 { <a name="l00275"></a>00275 <span class="comment">// Check if hostname is us</span> <a name="l00276"></a>00276 <span class="keywordtype">char</span> hostname[256]; <a name="l00277"></a>00277 hostname[0] = 0; <a name="l00278"></a>00278 gethostname(hostname, 255); <a name="l00279"></a>00279 hostname[255] = 0; <a name="l00280"></a>00280 <a name="l00281"></a>00281 <span class="keywordflow">if</span> (d->hostname == hostname) <a name="l00282"></a>00282 { <a name="l00283"></a>00283 <span class="comment">// Check if pid still exists</span> <a name="l00284"></a>00284 <span class="keywordtype">int</span> res = ::kill(d->pid, 0); <a name="l00285"></a>00285 <span class="keywordflow">if</span> ((res == -1) && (errno == ESRCH)) <a name="l00286"></a>00286 isStale = <span class="keyword">true</span>; <a name="l00287"></a>00287 } <a name="l00288"></a>00288 } <a name="l00289"></a>00289 <span class="keywordflow">if</span> (d->staleTimer.elapsed() > (d->staleTime*1000)) <a name="l00290"></a>00290 isStale = <span class="keyword">true</span>; <a name="l00291"></a>00291 <a name="l00292"></a>00292 <span class="keywordflow">if</span> (isStale) <a name="l00293"></a>00293 { <a name="l00294"></a>00294 <span class="keywordflow">if</span> ((options & <a class="code" href="classKLockFile.html#ec248e0c5d98c76307e5b8928cf54868f4c6d2d505657b792e1aab264e1fb439" title="Automatically remove a lock when a lock is detected that is stale for more than staleTime()...">LockForce</a>) == 0) <a name="l00295"></a>00295 <span class="keywordflow">return</span> <a class="code" href="classKLockFile.html#203a10d820e8d2f2e750034bfaad300c053f74e1c8fa18bf05da5520493c2227" title="A stale lock has been detected.">KLockFile::LockStale</a>; <a name="l00296"></a>00296 <a name="l00297"></a>00297 result = deleteStaleLock(d->file, d->statBuf, d->linkCountSupport); <a name="l00298"></a>00298 <a name="l00299"></a>00299 <span class="keywordflow">if</span> (result == <a class="code" href="classKLockFile.html#203a10d820e8d2f2e750034bfaad300c8dc52ef59704840c2d65f9f27b8779f0" title="Lock was acquired successfully.">KLockFile::LockOK</a>) <a name="l00300"></a>00300 { <a name="l00301"></a>00301 <span class="comment">// Lock deletion successful</span> <a name="l00302"></a>00302 d->staleTimer = <a class="codeRef" doxygen="qt.tag:/usr/lib/qt3/doc/html/" href="/usr/lib/qt3/doc/html/qtime.html">QTime</a>(); <a name="l00303"></a>00303 <span class="keywordflow">continue</span>; <span class="comment">// Now try to get the new lock</span> <a name="l00304"></a>00304 } <a name="l00305"></a>00305 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (result != <a class="code" href="classKLockFile.html#203a10d820e8d2f2e750034bfaad300c49f2dc19c3e4c75ddd5a8f27cb080c9a" title="The lock could not be acquired because it is held by another process.">KLockFile::LockFail</a>) <a name="l00306"></a>00306 { <a name="l00307"></a>00307 <span class="keywordflow">return</span> result; <a name="l00308"></a>00308 } <a name="l00309"></a>00309 } <a name="l00310"></a>00310 } <a name="l00311"></a>00311 <span class="keywordflow">else</span> <a name="l00312"></a>00312 { <a name="l00313"></a>00313 memcpy(&(d->statBuf), &st_buf, <span class="keyword">sizeof</span>(KDE_struct_stat)); <a name="l00314"></a>00314 d->staleTimer.start(); <a name="l00315"></a>00315 <a name="l00316"></a>00316 d->pid = -1; <a name="l00317"></a>00317 d->hostname = QString::null; <a name="l00318"></a>00318 d->instance = QString::null; <a name="l00319"></a>00319 <a name="l00320"></a>00320 <a class="codeRef" doxygen="qt.tag:/usr/lib/qt3/doc/html/" href="/usr/lib/qt3/doc/html/qfile.html">QFile</a> file(d->file); <a name="l00321"></a>00321 <span class="keywordflow">if</span> (file.<a class="codeRef" doxygen="qt.tag:/usr/lib/qt3/doc/html/" href="/usr/lib/qt3/doc/html/qfile.html#open">open</a>(IO_ReadOnly)) <a name="l00322"></a>00322 { <a name="l00323"></a>00323 <a class="codeRef" doxygen="qt.tag:/usr/lib/qt3/doc/html/" href="/usr/lib/qt3/doc/html/qtextstream.html">QTextStream</a> ts(&file); <a name="l00324"></a>00324 <span class="keywordflow">if</span> (!ts.<a class="codeRef" doxygen="qt.tag:/usr/lib/qt3/doc/html/" href="/usr/lib/qt3/doc/html/qtextstream.html#atEnd">atEnd</a>()) <a name="l00325"></a>00325 d->pid = ts.<a class="codeRef" doxygen="qt.tag:/usr/lib/qt3/doc/html/" href="/usr/lib/qt3/doc/html/qtextstream.html#readLine">readLine</a>().toInt(); <a name="l00326"></a>00326 <span class="keywordflow">if</span> (!ts.<a class="codeRef" doxygen="qt.tag:/usr/lib/qt3/doc/html/" href="/usr/lib/qt3/doc/html/qtextstream.html#atEnd">atEnd</a>()) <a name="l00327"></a>00327 d->instance = ts.<a class="codeRef" doxygen="qt.tag:/usr/lib/qt3/doc/html/" href="/usr/lib/qt3/doc/html/qtextstream.html#readLine">readLine</a>(); <a name="l00328"></a>00328 <span class="keywordflow">if</span> (!ts.<a class="codeRef" doxygen="qt.tag:/usr/lib/qt3/doc/html/" href="/usr/lib/qt3/doc/html/qtextstream.html#atEnd">atEnd</a>()) <a name="l00329"></a>00329 d->hostname = ts.<a class="codeRef" doxygen="qt.tag:/usr/lib/qt3/doc/html/" href="/usr/lib/qt3/doc/html/qtextstream.html#readLine">readLine</a>(); <a name="l00330"></a>00330 } <a name="l00331"></a>00331 } <a name="l00332"></a>00332 } <a name="l00333"></a>00333 <a name="l00334"></a>00334 <span class="keywordflow">if</span> ((options & <a class="code" href="classKLockFile.html#ec248e0c5d98c76307e5b8928cf548689d371843cbae914c86967ec963754f1c" title="Return immediately, do not wait for the lock to become available.">LockNoBlock</a>) != 0) <a name="l00335"></a>00335 <span class="keywordflow">break</span>; <a name="l00336"></a>00336 <a name="l00337"></a>00337 <span class="keyword">struct </span>timeval tv; <a name="l00338"></a>00338 tv.tv_sec = 0; <a name="l00339"></a>00339 tv.tv_usec = n*((<a class="code" href="classKApplication.html#f4e013a839f0ca4b35121fbc35ac0719" title="Generates a uniform random number.">KApplication::random</a>() % 200)+100); <a name="l00340"></a>00340 <span class="keywordflow">if</span> (n < 2000) <a name="l00341"></a>00341 n = n * 2; <a name="l00342"></a>00342 <a name="l00343"></a>00343 <span class="preprocessor">#ifdef Q_OS_UNIX</span> <a name="l00344"></a>00344 <span class="preprocessor"></span> select(0, 0, 0, 0, &tv); <a name="l00345"></a>00345 <span class="preprocessor">#else</span> <a name="l00346"></a>00346 <span class="preprocessor"></span> <span class="comment">//TODO for win32</span> <a name="l00347"></a>00347 <span class="preprocessor">#endif</span> <a name="l00348"></a>00348 <span class="preprocessor"></span> } <a name="l00349"></a>00349 <span class="keywordflow">if</span> (result == <a class="code" href="classKLockFile.html#203a10d820e8d2f2e750034bfaad300c8dc52ef59704840c2d65f9f27b8779f0" title="Lock was acquired successfully.">LockOK</a>) <a name="l00350"></a>00350 d->isLocked = <span class="keyword">true</span>; <a name="l00351"></a>00351 <span class="keywordflow">return</span> result; <a name="l00352"></a>00352 } <a name="l00353"></a>00353 <a name="l00354"></a><a class="code" href="classKLockFile.html#55228ef3c8cf3fb7c460baaa647bf8d0">00354</a> <span class="keywordtype">bool</span> <a class="code" href="classKLockFile.html#55228ef3c8cf3fb7c460baaa647bf8d0" title="Returns whether the lock is held or not.">KLockFile::isLocked</a>()<span class="keyword"> const</span> <a name="l00355"></a>00355 <span class="keyword"></span>{ <a name="l00356"></a>00356 <span class="keywordflow">return</span> d->isLocked; <a name="l00357"></a>00357 } <a name="l00358"></a>00358 <a name="l00359"></a><a class="code" href="classKLockFile.html#212b868e0b478e93088cbcc00f6365b9">00359</a> <span class="keywordtype">void</span> <a class="code" href="classKLockFile.html#212b868e0b478e93088cbcc00f6365b9" title="Release the lock.">KLockFile::unlock</a>() <a name="l00360"></a>00360 { <a name="l00361"></a>00361 <span class="keywordflow">if</span> (d->isLocked) <a name="l00362"></a>00362 { <a name="l00363"></a>00363 ::unlink(<a class="codeRef" doxygen="qt.tag:/usr/lib/qt3/doc/html/" href="/usr/lib/qt3/doc/html/qfile.html#encodeName">QFile::encodeName</a>(d->file)); <a name="l00364"></a>00364 d->isLocked = <span class="keyword">false</span>; <a name="l00365"></a>00365 } <a name="l00366"></a>00366 } <a name="l00367"></a>00367 <a name="l00368"></a><a class="code" href="classKLockFile.html#18ca62657f5ace4588a3976dea68a270">00368</a> <span class="keywordtype">bool</span> <a class="code" href="classKLockFile.html#18ca62657f5ace4588a3976dea68a270" title="Returns the pid, hostname and appname of the process holding the lock after the lock...">KLockFile::getLockInfo</a>(<span class="keywordtype">int</span> &pid, <a class="codeRef" doxygen="qt.tag:/usr/lib/qt3/doc/html/" href="/usr/lib/qt3/doc/html/qstring.html">QString</a> &hostname, <a class="codeRef" doxygen="qt.tag:/usr/lib/qt3/doc/html/" href="/usr/lib/qt3/doc/html/qstring.html">QString</a> &appname) <a name="l00369"></a>00369 { <a name="l00370"></a>00370 <span class="keywordflow">if</span> (d->pid == -1) <a name="l00371"></a>00371 <span class="keywordflow">return</span> <span class="keyword">false</span>; <a name="l00372"></a>00372 pid = d->pid; <a name="l00373"></a>00373 hostname = d->hostname; <a name="l00374"></a>00374 appname = d->instance; <a name="l00375"></a>00375 <span class="keywordflow">return</span> <span class="keyword">true</span>; <a name="l00376"></a>00376 } </pre></div></div> </div></div> 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