bool signalOtherInstance()
{
const char *fname = getPIDFile().c_str();
pid_t pid = readPID( fname );
std::cout << "read pid: " << pid << std::endl;
return ( pid > 0 && kill(pid, SIGUSR1) == 0 );
}
void KIPC::destroyPIDFile(const QString &kludgetId)
{
QString pidfile = getPIDFile(kludgetId);
if (QFile::exists(pidfile))
QFile::remove
(pidfile);
}
void writePID()
{
const char *fname = getPIDFile().c_str();
pid_t pid = getpid();
FILE *fp = fopen(fname, "w");
if( fp ) {
fprintf(fp, "%d\n", pid);
fclose(fp);
} else {
std::cerr << "error writing pid" << std::endl;
}
}
bool KIPC::setProcessId(const QString &kludgetId, int pid)
{
QString pidfile = getPIDFile(kludgetId);
QFile file;
file.setFileName(pidfile);
if (file.open(QIODevice::WriteOnly))
{
file.write(QString::number(pid).toUtf8());
file.write("\r\n", 2);
file.close();
return true;
}
return false;
}
int KIPC::getProcessId(const QString &kludgetId)
{
int pid = 0;
QString pidfile = getPIDFile(kludgetId);
if (QFile::exists(pidfile))
{
QFile file;
file.setFileName(pidfile);
if (file.open(QIODevice::ReadOnly))
{
QString text = file.readAll();
file.close();
pid = text.toInt();
}
}
// qDebug(">>%s %d", qPrintable(kludgetId), pid);
if (!checkProcess(pid))
return 0;
return pid;
}