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-rw-r--r--libkdegames/highscore/kfilelock.cpp88
1 files changed, 88 insertions, 0 deletions
diff --git a/libkdegames/highscore/kfilelock.cpp b/libkdegames/highscore/kfilelock.cpp
new file mode 100644
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+++ b/libkdegames/highscore/kfilelock.cpp
@@ -0,0 +1,88 @@
+/*
+ This file is part of the KDE 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 "kfilelock.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;
+}