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<h1>kfilelock.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 games library</span>
<a name="l00003"></a>00003 <span class="comment"> Copyright (C) 2003 Nicolas Hadacek <hadacek@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 "kfilelock.h"</span>
<a name="l00021"></a>00021
<a name="l00022"></a>00022 <span class="preprocessor">#include <unistd.h></span>
<a name="l00023"></a>00023 <span class="preprocessor">#include <sys/file.h></span>
<a name="l00024"></a>00024 <span class="preprocessor">#include <errno.h></span>
<a name="l00025"></a>00025
<a name="l00026"></a>00026 <span class="preprocessor">#include <kdebug.h></span>
<a name="l00027"></a>00027
<a name="l00028"></a>00028
<a name="l00029"></a>00029 KFileLock::KFileLock(<span class="keywordtype">int</span> fd)
<a name="l00030"></a>00030 : _fd(fd), _locked(false)
<a name="l00031"></a>00031 {}
<a name="l00032"></a>00032
<a name="l00033"></a>00033 <span class="keywordtype">int</span> KFileLock::lock()
<a name="l00034"></a>00034 {
<a name="l00035"></a>00035 kdDebug(11002) << <span class="stringliteral">"lock fd="</span> << _fd << endl;
<a name="l00036"></a>00036 <span class="preprocessor">#ifdef F_SETLK</span>
<a name="l00037"></a>00037 <span class="preprocessor"></span><span class="preprocessor"># ifndef SEEK_SET</span>
<a name="l00038"></a>00038 <span class="preprocessor"></span><span class="preprocessor"># define SEEK_SET 0</span>
<a name="l00039"></a>00039 <span class="preprocessor"></span><span class="preprocessor"># endif</span>
<a name="l00040"></a>00040 <span class="preprocessor"></span> <span class="keyword">struct </span>flock lock_data;
<a name="l00041"></a>00041 lock_data.l_type = F_WRLCK;
<a name="l00042"></a>00042 lock_data.l_whence = SEEK_SET;
<a name="l00043"></a>00043 lock_data.l_start = lock_data.l_len = 0;
<a name="l00044"></a>00044 <span class="keywordflow">if</span> ( fcntl(_fd, F_SETLK, &lock_data)==-1 ) {
<a name="l00045"></a>00045 <span class="keywordflow">if</span> ( errno==EAGAIN ) <span class="keywordflow">return</span> -2;
<a name="l00046"></a>00046 <span class="keywordflow">return</span> -1;
<a name="l00047"></a>00047 }
<a name="l00048"></a>00048 <span class="preprocessor">#else</span>
<a name="l00049"></a>00049 <span class="preprocessor"></span><span class="preprocessor"># ifdef LOCK_EX</span>
<a name="l00050"></a>00050 <span class="preprocessor"></span> <span class="keywordflow">if</span> ( flock (_fd, LOCK_EX|LOCK_NB)==-1 ) {
<a name="l00051"></a>00051 <span class="keywordflow">if</span> ( errno==EWOULDBLOCK ) <span class="keywordflow">return</span> -2;
<a name="l00052"></a>00052 <span class="keywordflow">return</span> -1;
<a name="l00053"></a>00053 }
<a name="l00054"></a>00054 <span class="preprocessor"># else</span>
<a name="l00055"></a>00055 <span class="preprocessor"></span> <span class="keywordflow">if</span> ( lockf(_fd, F_TLOCK, 0)==-1 ) {
<a name="l00056"></a>00056 <span class="keywordflow">if</span> ( errno==EACCES ) <span class="keywordflow">return</span> -2;
<a name="l00057"></a>00057 <span class="keywordflow">return</span> -1;
<a name="l00058"></a>00058 }
<a name="l00059"></a>00059 <span class="preprocessor"># endif</span>
<a name="l00060"></a>00060 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00061"></a>00061 <span class="preprocessor"></span> _locked = <span class="keyword">true</span>;
<a name="l00062"></a>00062 <span class="keywordflow">return</span> 0;
<a name="l00063"></a>00063 }
<a name="l00064"></a>00064
<a name="l00065"></a>00065 KFileLock::~KFileLock()
<a name="l00066"></a>00066 {
<a name="l00067"></a>00067 unlock();
<a name="l00068"></a>00068 }
<a name="l00069"></a>00069
<a name="l00070"></a>00070 <span class="keywordtype">void</span> KFileLock::unlock()
<a name="l00071"></a>00071 {
<a name="l00072"></a>00072 <span class="keywordflow">if</span> ( !_locked ) <span class="keywordflow">return</span>;
<a name="l00073"></a>00073 kdDebug(11002) << <span class="stringliteral">"unlock"</span> << endl;
<a name="l00074"></a>00074 <span class="preprocessor"># ifdef F_SETLK</span>
<a name="l00075"></a>00075 <span class="preprocessor"></span> <span class="keyword">struct </span>flock lock_data;
<a name="l00076"></a>00076 lock_data.l_type = F_UNLCK;
<a name="l00077"></a>00077 lock_data.l_whence = SEEK_SET;
<a name="l00078"></a>00078 lock_data.l_start = lock_data.l_len = 0;
<a name="l00079"></a>00079 (void)fcntl(_fd, F_SETLK, &lock_data);
<a name="l00080"></a>00080 <span class="preprocessor"># else</span>
<a name="l00081"></a>00081 <span class="preprocessor"></span><span class="preprocessor"># ifdef F_ULOCK</span>
<a name="l00082"></a>00082 <span class="preprocessor"></span> lockf(_fd, F_ULOCK, 0);
<a name="l00083"></a>00083 <span class="preprocessor"># else</span>
<a name="l00084"></a>00084 <span class="preprocessor"></span> flock(_fd, LOCK_UN);
<a name="l00085"></a>00085 <span class="preprocessor"># endif</span>
<a name="l00086"></a>00086 <span class="preprocessor"></span><span class="preprocessor"># endif</span>
<a name="l00087"></a>00087 <span class="preprocessor"></span> _locked = <span class="keyword">false</span>;
<a name="l00088"></a>00088 }
</pre></div></div>
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