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89 lines
2.1 KiB
89 lines
2.1 KiB
15 years ago
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/*
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13 years ago
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This file is part of the TDE games library
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15 years ago
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Copyright (C) 2003 Nicolas Hadacek <hadacek@kde.org>
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License version 2 as published by the Free Software Foundation.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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12 years ago
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#include "tdefilelock.h"
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15 years ago
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#include <unistd.h>
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#include <sys/file.h>
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#include <errno.h>
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#include <kdebug.h>
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KFileLock::KFileLock(int fd)
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: _fd(fd), _locked(false)
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{}
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int KFileLock::lock()
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{
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kdDebug(11002) << "lock fd=" << _fd << endl;
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#ifdef F_SETLK
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# ifndef SEEK_SET
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# define SEEK_SET 0
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# endif
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struct flock lock_data;
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lock_data.l_type = F_WRLCK;
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lock_data.l_whence = SEEK_SET;
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lock_data.l_start = lock_data.l_len = 0;
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if ( fcntl(_fd, F_SETLK, &lock_data)==-1 ) {
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if ( errno==EAGAIN ) return -2;
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return -1;
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}
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#else
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# ifdef LOCK_EX
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if ( flock (_fd, LOCK_EX|LOCK_NB)==-1 ) {
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if ( errno==EWOULDBLOCK ) return -2;
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return -1;
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}
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# else
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if ( lockf(_fd, F_TLOCK, 0)==-1 ) {
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if ( errno==EACCES ) return -2;
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return -1;
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}
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# endif
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#endif
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_locked = true;
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return 0;
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}
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KFileLock::~KFileLock()
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{
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unlock();
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}
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void KFileLock::unlock()
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{
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if ( !_locked ) return;
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kdDebug(11002) << "unlock" << endl;
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# ifdef F_SETLK
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struct flock lock_data;
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lock_data.l_type = F_UNLCK;
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lock_data.l_whence = SEEK_SET;
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lock_data.l_start = lock_data.l_len = 0;
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(void)fcntl(_fd, F_SETLK, &lock_data);
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# else
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# ifdef F_ULOCK
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lockf(_fd, F_ULOCK, 0);
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# else
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flock(_fd, LOCK_UN);
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# endif
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# endif
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_locked = false;
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}
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