You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
89 lines
2.1 KiB
89 lines
2.1 KiB
/*
|
|
This file is part of the TDE games library
|
|
Copyright (C) 2003 Nicolas Hadacek <hadacek@kde.org>
|
|
|
|
This library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Library General Public
|
|
License version 2 as published by the Free Software Foundation.
|
|
|
|
This library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public License
|
|
along with this library; see the file COPYING.LIB. If not, write to
|
|
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
|
|
Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
#include "tdefilelock.h"
|
|
|
|
#include <unistd.h>
|
|
#include <sys/file.h>
|
|
#include <errno.h>
|
|
|
|
#include <kdebug.h>
|
|
|
|
|
|
KFileLock::KFileLock(int fd)
|
|
: _fd(fd), _locked(false)
|
|
{}
|
|
|
|
int KFileLock::lock()
|
|
{
|
|
kdDebug(11002) << "lock fd=" << _fd << endl;
|
|
#ifdef F_SETLK
|
|
# ifndef SEEK_SET
|
|
# define SEEK_SET 0
|
|
# endif
|
|
struct flock lock_data;
|
|
lock_data.l_type = F_WRLCK;
|
|
lock_data.l_whence = SEEK_SET;
|
|
lock_data.l_start = lock_data.l_len = 0;
|
|
if ( fcntl(_fd, F_SETLK, &lock_data)==-1 ) {
|
|
if ( errno==EAGAIN ) return -2;
|
|
return -1;
|
|
}
|
|
#else
|
|
# ifdef LOCK_EX
|
|
if ( flock (_fd, LOCK_EX|LOCK_NB)==-1 ) {
|
|
if ( errno==EWOULDBLOCK ) return -2;
|
|
return -1;
|
|
}
|
|
# else
|
|
if ( lockf(_fd, F_TLOCK, 0)==-1 ) {
|
|
if ( errno==EACCES ) return -2;
|
|
return -1;
|
|
}
|
|
# endif
|
|
#endif
|
|
_locked = true;
|
|
return 0;
|
|
}
|
|
|
|
KFileLock::~KFileLock()
|
|
{
|
|
unlock();
|
|
}
|
|
|
|
void KFileLock::unlock()
|
|
{
|
|
if ( !_locked ) return;
|
|
kdDebug(11002) << "unlock" << endl;
|
|
# ifdef F_SETLK
|
|
struct flock lock_data;
|
|
lock_data.l_type = F_UNLCK;
|
|
lock_data.l_whence = SEEK_SET;
|
|
lock_data.l_start = lock_data.l_len = 0;
|
|
(void)fcntl(_fd, F_SETLK, &lock_data);
|
|
# else
|
|
# ifdef F_ULOCK
|
|
lockf(_fd, F_ULOCK, 0);
|
|
# else
|
|
flock(_fd, LOCK_UN);
|
|
# endif
|
|
# endif
|
|
_locked = false;
|
|
}
|