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/* This file is part of the KDE libraries
Copyright (C) 1997 Christian Czezakte (e9025461@student.tuwien.ac.at)
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#ifndef __KPROCCTRL_H__
#define __KPROCCTRL_H__
#include <qvaluelist.h>
#include "kprocess.h"
class QSocketNotifier;
/**
* @short Used internally by KProcess
* @internal
* @author Christian Czezatke <e9025461@student.tuwien.ac.at>
*
* A class for internal use by KProcess only. -- Exactly one instance
* of this class is created by KApplication.
*
* This class takes care of the actual (UN*X) signal handling.
*/
class KDECORE_EXPORT KProcessController : public QObject
{
Q_OBJECT
public:
/**
* Create an instance if none exists yet.
* Called by KApplication::KApplication()
*/
static void ref();
/**
* Destroy the instance if one exists and it is not referenced any more.
* Called by KApplication::~KApplication()
*/
static void deref();
/**
* Only a single instance of this class is allowed at a time,
* and this static variable is used to track the one instance.
*/
static KProcessController *theKProcessController; // kde4: rename: instance
/**
* Automatically called upon SIGCHLD. Never call it directly.
* If your application (or some library it uses) redirects SIGCHLD,
* the new signal handler (and only it) should call the old handler
* returned by sigaction().
* @internal
*/
static void theSigCHLDHandler(int signal); // KDE4: private
/**
* Wait for any process to exit and handle their exit without
* starting an event loop.
* This function may cause KProcess to emit any of its signals.
*
* @param timeout the timeout in seconds. -1 means no timeout.
* @return true if a process exited, false
* if no process exited within @p timeout seconds.
* @since 3.1
*/
bool waitForProcessExit(int timeout);
/**
* Call this function to defer processing of the data that became available
* on notifierFd().
* @since 3.2
*/
void unscheduleCheck();
/**
* This function @em must be called at some point after calling
* unscheduleCheck().
* @since 3.2
*/
void rescheduleCheck();
/*
* Obtain the file descriptor KProcessController uses to get notified
* about process exits. select() or poll() on it if you create a custom
* event loop that needs to act upon SIGCHLD.
* @return the file descriptor of the reading end of the notification pipe
* @since 3.2
*/
int notifierFd() const;
/**
* @internal
*/
void addKProcess( KProcess* );
/**
* @internal
*/
void removeKProcess( KProcess* );
/**
* @internal
*/
void addProcess( int pid );
private slots:
void slotDoHousekeeping();
private:
friend class I_just_love_gcc;
int fd[2];
bool needcheck;
QSocketNotifier *notifier;
QValueList<KProcess*> kProcessList;
QValueList<int> unixProcessList;
static void setupHandlers();
static void resetHandlers();
static struct sigaction oldChildHandlerData;
static bool handlerSet;
static int refCount;
// Disallow instantiation
KProcessController();
~KProcessController();
// Disallow assignment and copy-construction
KProcessController( const KProcessController& );
KProcessController& operator= ( const KProcessController& );
};
#endif
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