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/*
* LinuxServiceFunctions.cpp - implementation of LinuxServerProcess class
*
* Copyright (c) 2021-2025 Tobias Junghans <tobydox@veyon.io>
*
* This file is part of Veyon - https://veyon.io
*
* 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 (see COPYING); if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
*/
#include <QFileInfo>
#include <csignal>
#ifdef HAVE_LIBPROCPS
#include <proc/readproc.h>
#endif
#include <sys/errno.h>
#include <sys/types.h>
#include <sys/wait.h>
#include "Filesystem.h"
#include "LinuxCoreFunctions.h"
#include "LinuxServerProcess.h"
#include "VeyonConfiguration.h"
LinuxServerProcess::LinuxServerProcess( const QProcessEnvironment& processEnvironment,
const QString& sessionPath, int sessionId, QObject* parent ) :
QProcess( parent ),
m_sessionPath( sessionPath ),
m_sessionId( sessionId )
{
setProcessEnvironment( processEnvironment );
}
LinuxServerProcess::~LinuxServerProcess()
{
stop();
}
void LinuxServerProcess::start()
{
if( VeyonCore::config().logToSystem() )
{
setProcessChannelMode( QProcess::ForwardedChannels );
}
const auto catchsegv{ QStringLiteral("/usr/bin/catchsegv") };
if( qEnvironmentVariableIsSet("VEYON_VALGRIND_SERVERS") )
{
QProcess::start( QStringLiteral("/usr/bin/valgrind"),
{ QStringLiteral("--error-limit=no"),
QStringLiteral("--log-file=valgrind-veyon-server-%1.log").arg(m_sessionId),
VeyonCore::filesystem().serverFilePath() } );
}
else if( VeyonCore::isDebugging() && QFileInfo::exists( catchsegv ) )
{
QProcess::start( catchsegv, { VeyonCore::filesystem().serverFilePath() } );
}
else
{
QProcess::start( VeyonCore::filesystem().serverFilePath(), QStringList{} );
}
}
void LinuxServerProcess::stop()
{
const auto sendSignalRecursively = []( pid_t pid, int sig ) {
if( pid > 0 )
{
#ifdef HAVE_LIBPROCPS
LinuxCoreFunctions::forEachChildProcess(
[=]( proc_t* procInfo ) {
if( procInfo->tid > 0 && ::kill( procInfo->tid, sig ) < 0 && errno != ESRCH )
{
vCritical() << "kill() failed with" << errno;
}
return true;
},
pid, 0, true );
#elif defined(HAVE_LIBPROC2)
LinuxCoreFunctions::forEachChildProcess([=](const pids_stack* stack)
{
const pid_t tid = PIDS_VAL(0, s_int, stack);
if (tid > 0 && ::kill(tid, sig) < 0 && errno != ESRCH)
{
vCritical() << "kill() failed with" << errno;
}
return true;
},
pid,
{}, true);
#endif
if( ::kill( pid, sig ) < 0 && errno != ESRCH )
{
vCritical() << "kill() failed with" << errno;
}
// clean up process
waitpid( pid, nullptr, WNOHANG );
}
};
const auto pid = pid_t(processId());
// manually set process state since we're managing the process termination on our own
setProcessState( QProcess::NotRunning );
// tell x11vnc and child processes (in case spawned via catchsegv) to shutdown
sendSignalRecursively( pid, SIGINT );
if( LinuxCoreFunctions::waitForProcess( pid, ServerShutdownTimeout, ServerWaitSleepInterval ) == false )
{
sendSignalRecursively( pid, SIGTERM );
if( LinuxCoreFunctions::waitForProcess( pid, ServerTerminateTimeout, ServerWaitSleepInterval ) == false )
{
vWarning() << "server for session" << m_sessionPath << "still running - killing now";
sendSignalRecursively( pid, SIGKILL );
LinuxCoreFunctions::waitForProcess( pid, ServerKillTimeout, ServerWaitSleepInterval );
}
}
}
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