• Skip to content
  • Skip to link menu
Trinity API Reference
  • Trinity API Reference
  • libtdegames
 

libtdegames

  • libtdegames
  • highscore
tdefilelock.cpp
1/*
2 This file is part of the TDE games library
3 Copyright (C) 2003 Nicolas Hadacek <hadacek@kde.org>
4
5 This library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public
7 License version 2 as published by the Free Software Foundation.
8
9 This library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Library General Public License for more details.
13
14 You should have received a copy of the GNU Library General Public License
15 along with this library; see the file COPYING.LIB. If not, write to
16 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17 Boston, MA 02110-1301, USA.
18*/
19
20#include "tdefilelock.h"
21
22#include <unistd.h>
23#include <sys/file.h>
24#include <errno.h>
25
26#include <kdebug.h>
27
28
29KFileLock::KFileLock(int fd)
30 : _fd(fd), _locked(false)
31{}
32
33int KFileLock::lock()
34{
35 kdDebug(11002) << "lock fd=" << _fd << endl;
36#ifdef F_SETLK
37# ifndef SEEK_SET
38# define SEEK_SET 0
39# endif
40 struct flock lock_data;
41 lock_data.l_type = F_WRLCK;
42 lock_data.l_whence = SEEK_SET;
43 lock_data.l_start = lock_data.l_len = 0;
44 if ( fcntl(_fd, F_SETLK, &lock_data)==-1 ) {
45 if ( errno==EAGAIN ) return -2;
46 return -1;
47 }
48#else
49# ifdef LOCK_EX
50 if ( flock (_fd, LOCK_EX|LOCK_NB)==-1 ) {
51 if ( errno==EWOULDBLOCK ) return -2;
52 return -1;
53 }
54# else
55 if ( lockf(_fd, F_TLOCK, 0)==-1 ) {
56 if ( errno==EACCES ) return -2;
57 return -1;
58 }
59# endif
60#endif
61 _locked = true;
62 return 0;
63}
64
65KFileLock::~KFileLock()
66{
67 unlock();
68}
69
70void KFileLock::unlock()
71{
72 if ( !_locked ) return;
73 kdDebug(11002) << "unlock" << endl;
74# ifdef F_SETLK
75 struct flock lock_data;
76 lock_data.l_type = F_UNLCK;
77 lock_data.l_whence = SEEK_SET;
78 lock_data.l_start = lock_data.l_len = 0;
79 (void)fcntl(_fd, F_SETLK, &lock_data);
80# else
81# ifdef F_ULOCK
82 lockf(_fd, F_ULOCK, 0);
83# else
84 flock(_fd, LOCK_UN);
85# endif
86# endif
87 _locked = false;
88}

libtdegames

Skip menu "libtdegames"
  • Main Page
  • Class Hierarchy
  • Alphabetical List
  • Class List
  • File List
  • Class Members
  • Related Pages

libtdegames

Skip menu "libtdegames"
  • libtdegames
Generated for libtdegames by doxygen 1.9.4
This website is maintained by Timothy Pearson.