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/*
* Copyright 2008-2009 Fabrice Colin
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <sys/types.h>
#include <signal.h>
#include <unistd.h>
#include <errno.h>
#include <iostream>
#include <fstream>
#include <sstream>
#include "config.h"
#include "UniqueApplication.h"
using std::clog;
using std::clog;
using std::endl;
using std::string;
using std::fstream;
using std::stringstream;
UniqueApplication::UniqueApplication(const string &name)
{
#ifdef HAVE_UNIQUE
m_pApp = unique_app_new(name.c_str(), NULL);
#ifdef DEBUG
if (m_pApp != NULL)
{
clog << "UniqueApplication: registered" << endl;
}
else
{
clog << "UniqueApplication: failed to register" << endl;
}
#endif
#endif
}
UniqueApplication::~UniqueApplication()
{
#ifdef HAVE_UNIQUE
if (m_pApp != NULL)
{
g_object_unref(m_pApp);
}
#endif
}
bool UniqueApplication::isRunning(void)
{
#ifdef HAVE_UNIQUE
if ((m_pApp != NULL) &&
(unique_app_is_running(m_pApp) == TRUE))
{
return true;
}
#endif
return false;
}
bool UniqueApplication::isRunning(const string &pidFileName, const string &processName)
{
fstream pidFile;
// Open the PID file
pidFile.open(pidFileName.c_str(), std::ios::in);
if (pidFile.is_open() == false)
{
// The application may still be running even though the PID file doesn't exist
if (isRunning() == true)
{
return true;
}
// Keep going
}
else
{
pid_t processID = 0;
bool stillRunning = false, processDied = false;
pidFile >> processID;
pidFile.close();
// Is another process running ?
if (processID > 0)
{
#ifdef HAVE_UNIQUE
if (isRunning() == true)
{
// It's still running
stillRunning = true;
}
else
{
// It most likely died
processDied = true;
}
#else
fstream cmdLineFile;
stringstream cmdLineFileName;
bool checkProcess = true;
// FIXME: check for existence of /proc
cmdLineFileName << "/proc/" << processID << "/cmdline";
cmdLineFile.open(cmdLineFileName.str().c_str(), std::ios::in);
if (cmdLineFile.is_open() == true)
{
string cmdLine;
cmdLineFile >> cmdLine;
cmdLineFile.close();
if (cmdLine.find(processName) == string::npos)
{
// It's another process
checkProcess = false;
processDied = true;
}
}
#ifdef HAVE_KILL
if (checkProcess == true)
{
if (kill(processID, 0) == 0)
{
// It's still running
stillRunning = true;
}
else if (errno == ESRCH)
{
// This PID doesn't exist
processDied = true;
}
}
#endif
#endif
if (stillRunning == true)
{
clog << "Process " << processName << " (" << processID << ") is still running" << endl;
return true;
}
if (processDied == true)
{
clog << "Previous instance " << processID << " died prematurely" << endl;
}
}
}
// Now save our PID
pidFile.open(pidFileName.c_str(), std::ios::out);
if (pidFile.is_open() == true)
{
pidFile << getpid() << endl;
pidFile.close();
}
return false;
}
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