mirror of
https://github.com/ElvishArtisan/rivendell.git
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ac594cc68b
* Cleaned up deprecation warnings for 'QString::sprintf()'. Signed-off-by: Fred Gleason <fredg@paravelsystems.com>
108 lines
2.1 KiB
C++
108 lines
2.1 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 2002-2021 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 <QDir>
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#include <QString>
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#include <rdapplication.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(lock_path.toUtf8(),"r"))==NULL) {
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lock_locked=false;
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return false;
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}
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if(fscanf(file,"%d",&pid)!=1) {
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rda->syslog(LOG_WARNING,
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"RDInstanceLock::lock fscanf returned a parser failure [%s]",
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strerror(errno));
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}
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fclose(file);
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dir.setPath(QString::asprintf("/proc/%u",pid));
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if(!dir.exists()) {
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unlink(lock_path.toUtf8());
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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(lock_path.toUtf8());
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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(lock_path.toUtf8(),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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