mirror of
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698b475933
* Removed all CVS tags. * Removed 'const char *name' parameter from all QObject contructors.
103 lines
2.0 KiB
C++
103 lines
2.0 KiB
C++
// rdinstancelock.cpp
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//
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// An abstract instance-locking class.
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//
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// (C) Copyright 2002-2004,2016 Fred Gleason <fredg@paravelsystems.com>
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU Library General Public License
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// version 2 as published by the Free Software Foundation.
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//
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// This program 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
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public
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// License along with this program; if not, write to the Free Software
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// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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//
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//
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <qstring.h>
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#include <qdir.h>
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#include <rdinstancelock.h>
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RDInstanceLock::RDInstanceLock(QString path)
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{
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lock_path=path;
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lock_locked=false;
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}
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RDInstanceLock::~RDInstanceLock()
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{
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unlock();
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}
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bool RDInstanceLock::lock()
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{
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FILE *file;
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pid_t pid;
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QDir dir;
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if(MakeLock()) {
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lock_locked=true;
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return true;
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}
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if((file=fopen((const char *)lock_path,"r"))==NULL) {
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lock_locked=false;
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return false;
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}
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fscanf(file,"%d",&pid);
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fclose(file);
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dir.setPath(QString().sprintf("/proc/%u",pid));
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if(!dir.exists()) {
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unlink((const char *)lock_path);
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if(MakeLock()) {
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lock_locked=true;
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return true;
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}
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}
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lock_locked=false;
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return false;
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}
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void RDInstanceLock::unlock()
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{
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if(lock_locked) {
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unlink((const char *)lock_path);
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}
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lock_locked=false;
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}
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bool RDInstanceLock::locked()
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{
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return lock_locked;
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}
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bool RDInstanceLock::MakeLock()
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{
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FILE *file;
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int fd=open((const char *)lock_path,O_WRONLY|O_CREAT|O_EXCL,S_IRUSR|S_IWUSR);
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if(fd<0) {
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return false;
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}
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file=fdopen(fd,"w");
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fprintf(file,"%u",getpid());
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fclose(file);
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return true;
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}
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