/***************************************************************************

 * copyright            : (C) 2007 Shane King <kde@dontletsstart.com>      *

 **************************************************************************/

/***************************************************************************

 *                                                                         *

 *   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.                                   *

 *                                                                         *

 ***************************************************************************/

#include "AmarokProcess.h"    

#include "Debug.h"

#include <QTextCodec>

#include <fcntl.h>

#include <sys/time.h>

#include <sys/resource.h>

#include <unistd.h>

AmarokProcess::AmarokProcess(QObject *parent) 

    : KProcess(parent), lowPriority(false) 

{

    connect( this, SIGNAL( finished( int ) ), this, SLOT( finished() ) );

    connect( this, SIGNAL( readyReadStandardOutput() ), this, SLOT( readyReadStandardOutput() ) );

    connect( this, SIGNAL( readyReadStandardError() ), this, SLOT( readyReadStandardError() ) );

}

/** 

 * Due to xine-lib, we have to make KProcess close all fds, otherwise we get "device is busy" messages

 * exploiting setupChildProcess(), a virtual method that

 * happens to be called in the forked process

 * See bug #103750 for more information.

 */

void

AmarokProcess::setupChildProcess()

{

    KProcess::setupChildProcess();

#ifdef Q_OS_UNIX

    // can't get at the fds that QProcess needs to keep around to do its status

    // tracking , but fortunately it sets them to close on exec anyway, so if

    // we do likewise to everything then we should be ok.

    for(int i = sysconf(_SC_OPEN_MAX) - 1; i > 2; i--)

        fcntl(i, F_SETFD, FD_CLOEXEC);

    if( lowPriority )

        setpriority( PRIO_PROCESS, 0, 19 );

#endif

}

void

AmarokProcess::start()

{

    KProcess::start();

#ifdef Q_OS_WIN32

    if( lowPriority )

        SetPriorityClass( QProcess::pid()->hProcess, IDLE_PRIORITY_CLASS );

#endif

}

void

AmarokProcess::finished() // SLOT

{

    emit processExited( this );

}

void

AmarokProcess::readyReadStandardOutput() // SLOT

{

    emit receivedStdout( this );

}

void

AmarokProcess::readyReadStandardError() // SLOT

{

    emit receivedStderr( this );

}

// AmarokProcIO

AmarokProcIO::AmarokProcIO ( QObject *parent )

    : AmarokProcess( parent ), codec( QTextCodec::codecForName( "UTF-8" ) )

{

}

bool 

AmarokProcIO::writeStdin (const QString &line)

{

    return write( codec->fromUnicode( line + '\n' ) ) > 0;

}

int 

AmarokProcIO::readln (QString &line)

{

    QByteArray bytes = readLine();

    if (bytes.length() == 0)

    {

        return -1;

    }

    else

    {

        // convert and remove \n

        line = codec->toUnicode( bytes.data(), bytes.length() - 1);

        return line.length();

    }

}

void

AmarokProcIO::start()

{

    connect (this, SIGNAL (readyReadStandardOutput()), this, SLOT (readyReadStandardOutput()));

    KProcess::start ();

}

void 

AmarokProcIO::readyReadStandardOutput()

{

    if( canReadLine() )

        emit readReady( this );

}

// AmarokShellProcess

AmarokShellProcess &

AmarokShellProcess::operator<<(const QString& arg)

{

    if( program().isEmpty() )

        setShellCommand( arg );

    else

        AmarokProcess::operator<<( arg );

    return *this;

}

AmarokShellProcess &

AmarokShellProcess::operator<<(const QStringList& args)

{

    foreach( const QString &arg, args )

        *this << arg;

    return *this;

}