smsub/SMSubProcess.cpp

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/*****************************************************************************
* smsub Server Manager Subprocess
* Copyright (C) 2020 Syping
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* This software is provided as-is, no warranties are given to you, we are not
* responsible for anything with use of the software, you are self responsible.
*****************************************************************************/
#include <QCoreApplication>
#include <QTextStream>
#include "SMSubProcess.h"
#include "smsub.h"
SMSubProcess::SMSubProcess(const QString &executable, const QStringList &arguments, const QString &workingDirectory)
{
process.setProgram(executable);
process.setArguments(arguments);
process.setWorkingDirectory(workingDirectory);
process.setProcessChannelMode(QProcess::MergedChannels);
QObject::connect(&process, SIGNAL(readyRead()), this, SLOT(readyRead()));
QObject::connect(&process, SIGNAL(finished(int)), this, SLOT(processExit(int)));
QObject::connect(&process, SIGNAL(errorOccurred(QProcess::ProcessError)), this, SLOT(processError(QProcess::ProcessError)));
}
void SMSubProcess::start()
{
process.start(QIODevice::ReadWrite);
}
void SMSubProcess::readyRead()
{
// Read process output and emit event
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while (process.canReadLine()) {
const QByteArray readData = process.readLine().trimmed();
emit outputWritten(readData + '\n');
}
}
void SMSubProcess::processExit(int exitCode)
{
// Exit with the same exit code as the process
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emit processStopped();
QCoreApplication::exit(exitCode);
}
void SMSubProcess::processError(QProcess::ProcessError error)
{
// Handle process errors
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if (likely(error == QProcess::FailedToStart)) {
QTextStream(stderr) << "Process failed to start!" << endl;
QCoreApplication::exit(1);
}
else if (error == QProcess::UnknownError) {
QTextStream(stderr) << "Unknown error occurred!" << endl;
QCoreApplication::exit(1);
}
}
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void SMSubProcess::aboutToQuit()
{
// Main process terminated
if (process.state() == QProcess::Running) {
process.terminate();
if (!process.waitForFinished(60000)) {
QTextStream(stderr) << "Failed to terminate process!" << endl;
}
}
}
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void SMSubProcess::killProcess()
{
// Kill process as requested
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if (process.state() == QProcess::Running) {
process.kill();
}
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}
void SMSubProcess::stopProcess()
{
// Terminate process as requested
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if (process.state() == QProcess::Running) {
process.terminate();
}
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}
void SMSubProcess::writeInput(const QByteArray &input)
{
// Write input from Unix/IPC socket to process
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process.write(input);
}