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/*
# Copyright (c) 2009 - OpenSLX Project, Computer Center University of Freiburg
#
# This program is free software distributed under the GPL version 2.
# See http://openslx.org/COPYING
#
# If you have any feedback please consult http://openslx.org/feedback and
# send your suggestions, praise, or complaints to feedback@openslx.org
#
# General information about OpenSLX can be found at http://openslx.org/
# --------------------------------------------------------------------------
# pvsprivinputd.cpp:
# - Handle privileged input events - daemon
# --------------------------------------------------------------------------
*/
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/un.h>
#include <signal.h>
#include <unistd.h>
#include <cerrno>
#include <cstdlib>
#include <cstring>
#include <QtDebug>
#include <QSettings>
#include <QCoreApplication>
#include <QStringList>
#include <QSocketNotifier>
#include "pvsPrivInputSocket.h"
#include "pvsPrivInputHandler.h"
using namespace std;
#ifndef UNIX_PATH_MAX
# define UNIX_PATH_MAX 108 /* according to unix(7) */
#endif
QByteArray socketPath;
int sigintFds[2];
static void unlinkSocket()
{
if(!socketPath.isNull())
{
unlink(socketPath.constData());
}
}
static void onInterrupt(int)
{
char buf[] = { '!' };
char msg[] = "SIGINT caught. Quitting.\n";
write(sigintFds[0], buf, 1);
write(1, msg, sizeof(msg)-1);
}
int main(int argc, char** argv)
{
QCoreApplication app(argc, argv);
app.setApplicationName("pvsprivinputd");
app.setOrganizationName("openslx");
bool no_fork = app.arguments().contains("--no-fork", Qt::CaseInsensitive);
if(!no_fork)
{
pid_t pid;
pid_t sid;
pid = fork();
if(pid < 0)
{
qCritical("Could not fork: %s", strerror(errno));
exit(EXIT_FAILURE);
}
if(pid > 0)
{
exit(EXIT_SUCCESS);
}
// We are now inside a child process.
// Detach from parent:
sid = setsid();
if(sid < 0)
{
qCritical("Could not detach from parent process: %s", strerror(errno));
exit(EXIT_FAILURE);
}
// Change to some benign directory:
if(chdir("/") < 0)
{
qCritical("Could not change directory: %s", strerror(errno));
exit(EXIT_FAILURE);
}
}
// Okay, we are running as a daemon. Defer reopening standard file descriptors
// so we can report errors.
// Set the file creation mask to allow all processes to connect to
// the socket (access control is handled differently):
umask(0);
// Ignore SIGPIPE. Connection errors are handled internally.
// According to signal(2), the only error is that the signal number
// is invalid. This cannot happen.
signal(SIGPIPE, SIG_IGN);
// set up signal handling:
if(socketpair(AF_UNIX, SOCK_STREAM, 0, sigintFds) < 0)
{
qCritical("Could not set up signal handling. Giving up.");
exit(EXIT_FAILURE);
}
socketPath = pvsPrivInputGetSocketAddress().toLocal8Bit();
QSocketNotifier sigintWatcher(sigintFds[1], QSocketNotifier::Read);
QObject::connect(&sigintWatcher, SIGNAL(activated(int)), &app, SLOT(quit()));
signal(SIGINT, onInterrupt);
// Create our socket:
int sock = pvsPrivInputMakeServerSocket();
if(sock < 0)
{
exit(EXIT_FAILURE);
}
// Our setup is complete.
if(!no_fork)
{
// Reopen standard file descriptors:
freopen("/dev/null", "r", stdin);
freopen("/dev/null", "w", stderr);
freopen("/dev/null", "w", stdout);
}
// Install our main object
PVSPrivInputHandler handler(sock);
atexit(unlinkSocket);
// and run the main loop.
int ret = app.exec();
return ret;
}
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