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qprocess_unix.cpp

/****************************************************************************
** $Id: qprocess_unix.cpp,v 1.1.1.1 2002/01/25 22:14:56 kergoth Exp $
**
** Implementation of QProcess class for Unix
**
** Created : 20000905
**
** Copyright (C) 1992-2000 Trolltech AS.  All rights reserved.
**
** This file is part of the kernel module of the Qt GUI Toolkit.
**
** This file may be distributed under the terms of the Q Public License
** as defined by Trolltech AS of Norway and appearing in the file
** LICENSE.QPL included in the packaging of this file.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** Licensees holding valid Qt Enterprise Edition or Qt Professional Edition
** licenses may use this file in accordance with the Qt Commercial License
** Agreement provided with the Software.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
**   information about Qt Commercial License Agreements.
** See http://www.trolltech.com/qpl/ for QPL licensing information.
** See http://www.trolltech.com/gpl/ for GPL licensing information.
**
** Contact info@trolltech.com if any conditions of this licensing are
** not clear to you.
**
**********************************************************************/

//#include "qplatformdefs.h"

// Solaris redefines connect -> __xnet_connect with _XOPEN_SOURCE_EXTENDED.
#if defined(connect)
#undef connect
#endif

#include "qprocess.h"

#ifndef QT_NO_PROCESS

#include "qapplication.h"
#include "qqueue.h"
#include "qlist.h"
#include "qsocketnotifier.h"
#include "qtimer.h"
#include "qcleanuphandler_p.h"
#include "qregexp.h"

#include <stdlib.h>

// ### FOR Qt 2.3 compat
#include <unistd.h>
#include <signal.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/wait.h>
#include <sys/fcntl.h>

#include <errno.h>

#ifdef __MIPSEL__
# ifndef SOCK_DGRAM
#  define SOCK_DGRAM 1
# endif
# ifndef SOCK_STREAM
#  define SOCK_STREAM 2
# endif
#endif

//#define QT_QPROCESS_DEBUG


#ifdef Q_C_CALLBACKS
extern "C" {
#endif // Q_C_CALLBACKS

#define QT_SIGNAL_RETTYPE       void
#define QT_SIGNAL_ARGS          int
#define QT_SIGNAL_IGNORE        SIG_IGN

  QT_SIGNAL_RETTYPE qt_C_sigchldHnd(QT_SIGNAL_ARGS);

#ifdef Q_C_CALLBACKS
}
#endif // Q_C_CALLBACKS


class QProc;
class QProcessManager;
class QProcessPrivate
{
public:
    QProcessPrivate();
    ~QProcessPrivate();

    void closeOpenSocketsForChild();
    void newProc( pid_t pid, QProcess *process );

    QByteArray bufStdout;
    QByteArray bufStderr;

    QQueue<QByteArray> stdinBuf;

    QSocketNotifier *notifierStdin;
    QSocketNotifier *notifierStdout;
    QSocketNotifier *notifierStderr;

    ssize_t stdinBufRead;
    QProc *proc;

    bool exitValuesCalculated;
    bool socketReadCalled;

    static QProcessManager *procManager;
};


/***********************************************************************
 *
 * QProc
 *
 **********************************************************************/
/*
  The class QProcess does not necessarily map exactly to the running
  child processes: if the process is finished, the QProcess class may still be
  there; furthermore a user can use QProcess to start more than one process.

  The helper-class QProc has the semantics that one instance of this class maps
  directly to a running child process.
*/
class QProc
{
public:
    QProc( pid_t p, QProcess *proc=0 ) : pid(p), process(proc)
    {
#if defined(QT_QPROCESS_DEBUG)
    qDebug( "QProc: Constructor for pid %d and QProcess %p", pid, process );
#endif
    socketStdin = 0;
    socketStdout = 0;
    socketStderr = 0;
    }
    ~QProc()
    {
#if defined(QT_QPROCESS_DEBUG)
    qDebug( "QProc: Destructor for pid %d and QProcess %p", pid, process );
#endif
    if ( process != 0 ) {
        if ( process->d->notifierStdin )
          process->d->notifierStdin->setEnabled( FALSE );
        if ( process->d->notifierStdout )
        process->d->notifierStdout->setEnabled( FALSE );
        if ( process->d->notifierStderr )
        process->d->notifierStderr->setEnabled( FALSE );
        process->d->proc = 0;
    }
    if( socketStdin != 0 )
      ::close( socketStdin );
    // ### close these sockets even on parent exit or is it better only on
    // sigchld (but what do I have to do with them on exit then)?
    if( socketStdout != 0 )
        ::close( socketStdout );
    if( socketStderr != 0 )
        ::close( socketStderr );
    }

    pid_t pid;
    int socketStdin;
    int socketStdout;
    int socketStderr;
    QProcess *process;
};

/***********************************************************************
 *
 * QProcessManager
 *
 **********************************************************************/
class QProcessManager : public QObject
{
    Q_OBJECT

public:
    QProcessManager();
    ~QProcessManager();

    void append( QProc *p );
    void remove( QProc *p );

    void cleanup();

public slots:
    void removeMe();
    void sigchldHnd( int );

public:
    struct sigaction oldactChld;
    struct sigaction oldactPipe;
    QList<QProc> *procList;
    int sigchldFd[2];
};

QCleanupHandler<QProcessManager> qprocess_cleanup_procmanager;

QProcessManager::QProcessManager()
{
    procList = new QList<QProc>;
    procList->setAutoDelete( TRUE );

    // The SIGCHLD handler writes to a socket to tell the manager that
    // something happened. This is done to get the processing in sync with the
    // event reporting.
    if ( ::socketpair( AF_UNIX, SOCK_STREAM, 0, sigchldFd ) ) {
    sigchldFd[0] = 0;
    sigchldFd[1] = 0;
    } else {
#if defined(QT_QPROCESS_DEBUG)
    qDebug( "QProcessManager: install socket notifier (%d)", sigchldFd[1] );
#endif
    QSocketNotifier *sn = new QSocketNotifier( sigchldFd[1],
        QSocketNotifier::Read, this );
    connect( sn, SIGNAL(activated(int)),
        this, SLOT(sigchldHnd(int)) );
    sn->setEnabled( TRUE );
    }

    // install a SIGCHLD handler and ignore SIGPIPE
    struct sigaction act;

#if defined(QT_QPROCESS_DEBUG)
    qDebug( "QProcessManager: install a SIGCHLD handler" );
#endif
    act.sa_handler = qt_C_sigchldHnd;
    sigemptyset( &(act.sa_mask) );
    sigaddset( &(act.sa_mask), SIGCHLD );
    act.sa_flags = SA_NOCLDSTOP;
#if defined(SA_RESTART)
    act.sa_flags |= SA_RESTART;
#endif
    if ( sigaction( SIGCHLD, &act, &oldactChld ) != 0 )
    qWarning( "Error installing SIGCHLD handler" );

#if defined(QT_QPROCESS_DEBUG)
    qDebug( "QProcessManager: install a SIGPIPE handler (SIG_IGN)" );
#endif
    act.sa_handler = QT_SIGNAL_IGNORE;
    sigemptyset( &(act.sa_mask) );
    sigaddset( &(act.sa_mask), SIGPIPE );
    act.sa_flags = 0;
    if ( sigaction( SIGPIPE, &act, &oldactPipe ) != 0 )
    qWarning( "Error installing SIGPIPE handler" );
}

QProcessManager::~QProcessManager()
{
    delete procList;

    if ( sigchldFd[0] != 0 )
    ::close( sigchldFd[0] );
    if ( sigchldFd[1] != 0 )
    ::close( sigchldFd[1] );

    // restore SIGCHLD handler
#if defined(QT_QPROCESS_DEBUG)
    qDebug( "QProcessManager: restore old sigchild handler" );
#endif
    if ( sigaction( SIGCHLD, &oldactChld, 0 ) != 0 )
    qWarning( "Error restoring SIGCHLD handler" );

#if defined(QT_QPROCESS_DEBUG)
    qDebug( "QProcessManager: restore old sigpipe handler" );
#endif
    if ( sigaction( SIGPIPE, &oldactPipe, 0 ) != 0 )
    qWarning( "Error restoring SIGPIPE handler" );
}

void QProcessManager::append( QProc *p )
{
    procList->append( p );
#if defined(QT_QPROCESS_DEBUG)
    qDebug( "QProcessManager: append process (procList.count(): %d)", procList->count() );
#endif
}

void QProcessManager::remove( QProc *p )
{
    procList->remove( p );
#if defined(QT_QPROCESS_DEBUG)
    qDebug( "QProcessManager: remove process (procList.count(): %d)", procList->count() );
#endif
    cleanup();
}

void QProcessManager::cleanup()
{
    if ( procList->count() == 0 ) {
    QTimer::singleShot( 0, this, SLOT(removeMe()) );
    }
}

void QProcessManager::removeMe()
{
    if ( procList->count() == 0 ) {
    qprocess_cleanup_procmanager.remove( &QProcessPrivate::procManager );
    QProcessPrivate::procManager = 0;
    delete this;
    }
}

void QProcessManager::sigchldHnd( int fd )
{
    char tmp;
    ::read( fd, &tmp, sizeof(tmp) );
#if defined(QT_QPROCESS_DEBUG)
    qDebug( "QProcessManager::sigchldHnd()" );
#endif
    QProc *proc;
    QProcess *process;
    bool removeProc;
    proc = procList->first();
    while ( proc != 0 ) {
    removeProc = FALSE;
    process = proc->process;
    if ( process != 0 ) {
        if ( !process->isRunning() ) {
#if defined(QT_QPROCESS_DEBUG)
        qDebug( "QProcessManager::sigchldHnd() (PID: %d): process exited (QProcess available)", proc->pid );
#endif
        // read pending data
        int nbytes = 0;
        if ( ::ioctl(proc->socketStdout, FIONREAD, (char*)&nbytes)==0 && nbytes>0 ) {
#if defined(QT_QPROCESS_DEBUG)
        qDebug( "QProcessManager::sigchldHnd() (PID: %d): reading %d bytes of pending data on stdout", proc->pid, nbytes );
#endif
            process->socketRead( proc->socketStdout );
        }
        nbytes = 0;
        if ( ::ioctl(proc->socketStderr, FIONREAD, (char*)&nbytes)==0 && nbytes>0 ) {
#if defined(QT_QPROCESS_DEBUG)
        qDebug( "QProcessManager::sigchldHnd() (PID: %d): reading %d bytes of pending data on stderr", proc->pid, nbytes );
#endif
            process->socketRead( proc->socketStderr );
        }

        if ( process->notifyOnExit )
            emit process->processExited();

        removeProc = TRUE;
        }
    } else {
        int status;
        if ( ::waitpid( proc->pid, &status, WNOHANG ) == proc->pid ) {
#if defined(QT_QPROCESS_DEBUG)
        qDebug( "QProcessManager::sigchldHnd() (PID: %d): process exited (QProcess not available)", proc->pid );
#endif
        removeProc = TRUE;
        }
    }
    if ( removeProc ) {
        QProc *oldproc = proc;
        proc = procList->next();
        remove( oldproc );
    } else {
        proc = procList->next();
    }
    }
}

#include "qprocess_unix.moc"


/***********************************************************************
 *
 * QProcessPrivate
 *
 **********************************************************************/
QProcessManager *QProcessPrivate::procManager = 0;

QProcessPrivate::QProcessPrivate()
{
#if defined(QT_QPROCESS_DEBUG)
    qDebug( "QProcessPrivate: Constructor" );
#endif
    stdinBufRead = 0;

    notifierStdin = 0;
    notifierStdout = 0;
    notifierStderr = 0;

    exitValuesCalculated = FALSE;
    socketReadCalled = FALSE;

    proc = 0;
}

QProcessPrivate::~QProcessPrivate()
{
#if defined(QT_QPROCESS_DEBUG)
    qDebug( "QProcessPrivate: Destructor" );
#endif

    if ( proc != 0 ) {
    if ( proc->socketStdin != 0 ) {
        ::close( proc->socketStdin );
        proc->socketStdin = 0;
    }
    proc->process = 0;
    }

    while ( !stdinBuf.isEmpty() ) {
    delete stdinBuf.dequeue();
    }
    delete notifierStdin;
    delete notifierStdout;
    delete notifierStderr;
}

/*
  Closes all open sockets in the child process that are not needed by the child
  process. Otherwise one child may have an open socket on standard input, etc.
  of another child.
*/
void QProcessPrivate::closeOpenSocketsForChild()
{
    if ( procManager != 0 ) {
    if ( procManager->sigchldFd[0] != 0 )
        ::close( procManager->sigchldFd[0] );
    if ( procManager->sigchldFd[1] != 0 )
        ::close( procManager->sigchldFd[1] );

    // close also the sockets from other QProcess instances
    QProc *proc;
    for ( proc=procManager->procList->first(); proc!=0; proc=procManager->procList->next() ) {
        ::close( proc->socketStdin );
        ::close( proc->socketStdout );
        ::close( proc->socketStderr );
    }
    }
}

void QProcessPrivate::newProc( pid_t pid, QProcess *process )
{
    proc = new QProc( pid, process );
    if ( procManager == 0 ) {
    procManager = new QProcessManager;
    qprocess_cleanup_procmanager.add( &procManager );
    }
    // the QProcessManager takes care of deleting the QProc instances
    procManager->append( proc );
}

/***********************************************************************
 *
 * sigchld handler callback
 *
 **********************************************************************/
QT_SIGNAL_RETTYPE qt_C_sigchldHnd( QT_SIGNAL_ARGS )
{
    if ( QProcessPrivate::procManager == 0 )
    return;
    if ( QProcessPrivate::procManager->sigchldFd[0] == 0 )
    return;

    char a = 1;
    ::write( QProcessPrivate::procManager->sigchldFd[0], &a, sizeof(a) );
}


/***********************************************************************
 *
 * QProcess
 *
 **********************************************************************/
void QProcess::init()
{
    d = new QProcessPrivate();
    exitStat = 0;
    exitNormal = FALSE;
}

void QProcess::reset()
{
    delete d;
    d = new QProcessPrivate();
    exitStat = 0;
    exitNormal = FALSE;
    d->bufStdout.resize( 0 );
    d->bufStderr.resize( 0 );
}

QByteArray* QProcess::bufStdout()
{
    if ( d->proc && d->proc->socketStdout ) {
    // ### can this cause a blocking behaviour (maybe do a ioctl() to see
    // if data is available)?
    socketRead( d->proc->socketStdout );
    }
    return &d->bufStdout;
}

QByteArray* QProcess::bufStderr()
{
    if ( d->proc && d->proc->socketStderr ) {
    // ### can this cause a blocking behaviour (maybe do a ioctl() to see
    // if data is available)?
    socketRead( d->proc->socketStderr );
    }
    return &d->bufStderr;
}

void QProcess::consumeBufStdout( int consume )
{
    uint n = d->bufStdout.size();
    if ( consume==-1 || (uint)consume >= n ) {
    d->bufStdout.resize( 0 );
    } else {
    QByteArray tmp( n - consume );
    memcpy( tmp.data(), d->bufStdout.data()+consume, n-consume );
    d->bufStdout = tmp;
    }
}

void QProcess::consumeBufStderr( int consume )
{
    uint n = d->bufStderr.size();
    if ( consume==-1 || (uint)consume >= n ) {
    d->bufStderr.resize( 0 );
    } else {
    QByteArray tmp( n - consume );
    memcpy( tmp.data(), d->bufStderr.data()+consume, n-consume );
    d->bufStderr = tmp;
    }
}

QProcess::~QProcess()
{
    delete d;
}

bool QProcess::start( QStringList *env )
{
#if defined(QT_QPROCESS_DEBUG)
    qDebug( "QProcess::start()" );
#endif
    reset();

    int sStdin[2];
    int sStdout[2];
    int sStderr[2];

    // open sockets for piping
    if ( (comms & Stdin) && ::socketpair( AF_UNIX, SOCK_STREAM, 0, sStdin ) == -1 ) {
    return FALSE;
    }
    if ( (comms & Stderr) && ::socketpair( AF_UNIX, SOCK_STREAM, 0, sStderr ) == -1 ) {
    return FALSE;
    }
    if ( (comms & Stdout) && ::socketpair( AF_UNIX, SOCK_STREAM, 0, sStdout ) == -1 ) {
    return FALSE;
    }

    // the following pipe is only used to determine if the process could be
    // started
    int fd[2];
    if ( pipe( fd ) < 0 ) {
    // non critical error, go on
    fd[0] = 0;
    fd[1] = 0;
    }

    // construct the arguments for exec
    QCString *arglistQ = new QCString[ _arguments.count() + 1 ];
    const char** arglist = new const char*[ _arguments.count() + 1 ];
    int i = 0;
    for ( QStringList::Iterator it = _arguments.begin(); it != _arguments.end(); ++it ) {
    arglistQ[i] = (*it).local8Bit();
    arglist[i] = arglistQ[i];
#if defined(QT_QPROCESS_DEBUG)
    qDebug( "QProcess::start(): arg %d = %s", i, arglist[i] );
#endif
    i++;
    }
    arglist[i] = 0;

    // Must make sure signal handlers are installed before exec'ing
    // in case the process exits quickly.
    if ( d->procManager == 0 ) {
    d->procManager = new QProcessManager;
    qprocess_cleanup_procmanager.add( &d->procManager );
    }

    // fork and exec
    QApplication::flushX();
    pid_t pid = fork();
    if ( pid == 0 ) {
    // child
    d->closeOpenSocketsForChild();
    if ( comms & Stdin ) {
        ::close( sStdin[1] );
        ::dup2( sStdin[0], STDIN_FILENO );
    }
    if ( comms & Stdout ) {
        ::close( sStdout[0] );
        ::dup2( sStdout[1], STDOUT_FILENO );
    }
    if ( comms & Stderr ) {
        ::close( sStderr[0] );
        ::dup2( sStderr[1], STDERR_FILENO );
    }
    if ( comms & DupStderr ) {
        ::dup2( STDOUT_FILENO, STDERR_FILENO );
    }
#ifndef QT_NO_DIR
    ::chdir( workingDir.absPath().latin1() );
#endif
    if ( fd[0] )
        ::close( fd[0] );
    if ( fd[1] )
        ::fcntl( fd[1], F_SETFD, FD_CLOEXEC ); // close on exec shows sucess

    if ( env == 0 ) { // inherit environment and start process
        ::execvp( arglist[0], (char*const*)arglist ); // ### cast not nice
    } else { // start process with environment settins as specified in env
        // construct the environment for exec
        int numEntries = env->count();
        bool setLibraryPath =
        env->grep( QRegExp( "^LD_LIBRARY_PATH=" ) ).isEmpty() &&
        getenv( "LD_LIBRARY_PATH" ) != 0;
        if ( setLibraryPath )
        numEntries++;
        QCString *envlistQ = new QCString[ numEntries + 1 ];
        const char** envlist = new const char*[ numEntries + 1 ];
        int i = 0;
        if ( setLibraryPath ) {
        envlistQ[i] = QString( "LD_LIBRARY_PATH=%1" ).arg( getenv( "LD_LIBRARY_PATH" ) ).local8Bit();
        envlist[i] = envlistQ[i];
        i++;
        }
        for ( QStringList::Iterator it = env->begin(); it != env->end(); ++it ) {
        envlistQ[i] = (*it).local8Bit();
        envlist[i] = envlistQ[i];
        i++;
        }
        envlist[i] = 0;

        // look for the executable in the search path
        if ( _arguments.count()>0 && getenv("PATH")!=0 ) {
        QString command = _arguments[0];
        if ( !command.contains( '/' ) ) {
            QStringList pathList = QStringList::split( ':', getenv( "PATH" ) );
            for (QStringList::Iterator it = pathList.begin(); it != pathList.end(); ++it ) {
            QString dir = *it;
#ifdef Q_OS_MACX
            if(QFile::exists(dir + "/" + command + ".app")) //look in a bundle
                dir += "/" + command + ".app/Contents/MacOS";
#endif
#ifndef QT_NO_DIR
            QFileInfo fileInfo( dir, command );
#else
            QFileInfo fileInfo( dir + "/" + command );
#endif
            if ( fileInfo.isExecutable() ) {
                arglistQ[0] = fileInfo.filePath().local8Bit();
                arglist[0] = arglistQ[0];
                break;
            }
            }
        }
        }
        ::execve( arglist[0], (char*const*)arglist, (char*const*)envlist ); // ### casts not nice
    }
    if ( fd[1] ) {
        char buf = 0;
        ::write( fd[1], &buf, 1 );
        ::close( fd[1] );
    }
    ::exit( -1 );
    } else if ( pid == -1 ) {
    // error forking
    goto error;
    }

    // test if exec was successful
    if ( fd[1] )
    ::close( fd[1] );
    if ( fd[0] ) {
    char buf;
    for ( ;; ) {
        int n = ::read( fd[0], &buf, 1 );
        if ( n==1 ) {
        // socket was not closed => error
        d->proc = 0;
        goto error;
        } else if ( n==-1 ) {
        if ( errno==EAGAIN || errno==EINTR )
            // try it again
            continue;
        }
        break;
    }
    ::close( fd[0] );
    }

    d->newProc( pid, this );

    if ( comms & Stdin ) {
    ::close( sStdin[0] );
    d->proc->socketStdin = sStdin[1];
    d->notifierStdin = new QSocketNotifier( sStdin[1], QSocketNotifier::Write );
    connect( d->notifierStdin, SIGNAL(activated(int)),
        this, SLOT(socketWrite(int)) );
    // setup notifiers for the sockets
    if ( !d->stdinBuf.isEmpty() ) {
        d->notifierStdin->setEnabled( TRUE );
    }
    }
    if ( comms & Stdout ) {
    ::close( sStdout[1] );
    d->proc->socketStdout = sStdout[0];
    d->notifierStdout = new QSocketNotifier( sStdout[0], QSocketNotifier::Read );
    connect( d->notifierStdout, SIGNAL(activated(int)),
        this, SLOT(socketRead(int)) );
    if ( ioRedirection )
        d->notifierStdout->setEnabled( TRUE );
    }
    if ( comms & Stderr ) {
    ::close( sStderr[1] );
    d->proc->socketStderr = sStderr[0];
    d->notifierStderr = new QSocketNotifier( sStderr[0], QSocketNotifier::Read );
    connect( d->notifierStderr, SIGNAL(activated(int)),
        this, SLOT(socketRead(int)) );
    if ( ioRedirection )
        d->notifierStderr->setEnabled( TRUE );
    }

    // cleanup and return
    delete[] arglistQ;
    delete[] arglist;
    return TRUE;

error:
#if defined(QT_QPROCESS_DEBUG)
    qDebug( "QProcess::start(): error starting process" );
#endif
    if ( d->procManager )
    d->procManager->cleanup();
    if ( comms & Stdin ) {
    ::close( sStdin[1] );
    ::close( sStdin[0] );
    }
    if ( comms & Stdout ) {
    ::close( sStdout[0] );
    ::close( sStdout[1] );
    }
    if ( comms & Stderr ) {
    ::close( sStderr[0] );
    ::close( sStderr[1] );
    }
    ::close( fd[0] );
    ::close( fd[1] );
    delete[] arglistQ;
    delete[] arglist;
    return FALSE;
}


void QProcess::tryTerminate() const
{
    if ( d->proc != 0 )
    ::kill( d->proc->pid, SIGTERM );
}

void QProcess::kill() const
{
    if ( d->proc != 0 )
    ::kill( d->proc->pid, SIGKILL );
}

bool QProcess::isRunning() const
{
    if ( d->exitValuesCalculated ) {
#if defined(QT_QPROCESS_DEBUG)
    qDebug( "QProcess::isRunning(): FALSE (already computed)" );
#endif
    return FALSE;
    }
    if ( d->proc == 0 )
    return FALSE;
    int status;
    if ( ::waitpid( d->proc->pid, &status, WNOHANG ) == d->proc->pid )
    {
    // compute the exit values
    QProcess *that = (QProcess*)this; // mutable
    that->exitNormal = WIFEXITED( status ) != 0;
    if ( exitNormal ) {
        that->exitStat = (char)WEXITSTATUS( status );
    }
    d->exitValuesCalculated = TRUE;
#if defined(QT_QPROCESS_DEBUG)
    qDebug( "QProcess::isRunning() (PID: %d): FALSE", d->proc->pid );
#endif
    return FALSE;
    }
#if defined(QT_QPROCESS_DEBUG)
    qDebug( "QProcess::isRunning() (PID: %d): TRUE", d->proc->pid );
#endif
    return TRUE;
}

void QProcess::writeToStdin( const QByteArray& buf )
{
#if defined(QT_QPROCESS_DEBUG)
//    qDebug( "QProcess::writeToStdin(): write to stdin (%d)", d->socketStdin );
#endif
    d->stdinBuf.enqueue( new QByteArray(buf) );
    if ( d->notifierStdin != 0 )
    d->notifierStdin->setEnabled( TRUE );
}


void QProcess::closeStdin()
{
    if ( d->proc == 0 )
    return;
    if ( d->proc->socketStdin !=0 ) {
    while ( !d->stdinBuf.isEmpty() ) {
        delete d->stdinBuf.dequeue();
    }
    delete d->notifierStdin;
    d->notifierStdin = 0;
    if ( ::close( d->proc->socketStdin ) != 0 ) {
        qWarning( "Could not close stdin of child process" );
    }
#if defined(QT_QPROCESS_DEBUG)
    qDebug( "QProcess::closeStdin(): stdin (%d) closed", d->proc->socketStdin );
#endif
    d->proc->socketStdin = 0;
    }
}


/*
  This private slot is called when the process has outputted data to either
  standard output or standard error.
*/
void QProcess::socketRead( int fd )
{
    if ( d->socketReadCalled ) {
    // the slots that are connected to the readyRead...() signals might
    // trigger a recursive call of socketRead(). Avoid this since you get a
    // blocking read otherwise.
    return;
    }
#if defined(QT_QPROCESS_DEBUG)
    qDebug( "QProcess::socketRead(): %d", fd );
#endif
    if ( fd == 0 )
    return;
    const int bufsize = 4096;
    QByteArray *buffer = 0;
    uint oldSize;
    int n;
    if ( fd == d->proc->socketStdout ) {
    buffer = &d->bufStdout;
    } else if ( fd == d->proc->socketStderr ) {
    buffer = &d->bufStderr;
    } else {
    // this case should never happen, but just to be safe
    return;
    }

    // read data
    oldSize = buffer->size();
    buffer->resize( oldSize + bufsize );
    n = ::read( fd, buffer->data()+oldSize, bufsize );
    if ( n > 0 )
    buffer->resize( oldSize + n );
    else
    buffer->resize( oldSize );
    // eof or error?
    if ( n == 0 || n == -1 ) {
    if ( fd == d->proc->socketStdout ) {
#if defined(QT_QPROCESS_DEBUG)
        qDebug( "QProcess::socketRead(): stdout (%d) closed", fd );
#endif
        d->notifierStdout->setEnabled( FALSE );
        delete d->notifierStdout;
        d->notifierStdout = 0;
        ::close( d->proc->socketStdout );
        d->proc->socketStdout = 0;
        return;
    } else if ( fd == d->proc->socketStderr ) {
#if defined(QT_QPROCESS_DEBUG)
        qDebug( "QProcess::socketRead(): stderr (%d) closed", fd );
#endif
        d->notifierStderr->setEnabled( FALSE );
        delete d->notifierStderr;
        d->notifierStderr = 0;
        ::close( d->proc->socketStderr );
        d->proc->socketStderr = 0;
        return;
    }
    }
    // read all data that is available
    while ( n == bufsize ) {
    oldSize = buffer->size();
    buffer->resize( oldSize + bufsize );
    n = ::read( fd, buffer->data()+oldSize, bufsize );
    if ( n > 0 )
        buffer->resize( oldSize + n );
    else
        buffer->resize( oldSize );
    }

    d->socketReadCalled = TRUE;
    if ( fd == d->proc->socketStdout ) {
#if defined(QT_QPROCESS_DEBUG)
    qDebug( "QProcess::socketRead(): %d bytes read from stdout (%d)",
        buffer->size()-oldSize, fd );
#endif
    emit readyReadStdout();
    } else if ( fd == d->proc->socketStderr ) {
#if defined(QT_QPROCESS_DEBUG)
    qDebug( "QProcess::socketRead(): %d bytes read from stderr (%d)",
        buffer->size()-oldSize, fd );
#endif
    emit readyReadStderr();
    }
    d->socketReadCalled = FALSE;
}


/*
  This private slot is called when the process tries to read data from standard
  input.
*/
void QProcess::socketWrite( int fd )
{
    if ( fd != d->proc->socketStdin || d->proc->socketStdin == 0 )
    return;
    if ( d->stdinBuf.isEmpty() ) {
    d->notifierStdin->setEnabled( FALSE );
    return;
    }
#if defined(QT_QPROCESS_DEBUG)
    qDebug( "QProcess::socketWrite(): write to stdin (%d)", fd );
#endif
    ssize_t ret = ::write( fd,
        d->stdinBuf.head()->data() + d->stdinBufRead,
        d->stdinBuf.head()->size() - d->stdinBufRead );
    if ( ret > 0 )
    d->stdinBufRead += ret;
    if ( d->stdinBufRead == (ssize_t)d->stdinBuf.head()->size() ) {
    d->stdinBufRead = 0;
    delete d->stdinBuf.dequeue();
    if ( wroteToStdinConnected && d->stdinBuf.isEmpty() )
        emit wroteToStdin();
    socketWrite( fd );
    }
}

void QProcess::flushStdin()
{
    socketWrite( d->proc->socketStdin );
}

/*
  This private slot is only used under Windows (but moc does not know about #if
  defined()).
*/
void QProcess::timeout()
{
}


/*
  This private function is used by connectNotify() and disconnectNotify() to
  change the value of ioRedirection (and related behaviour)
*/
void QProcess::setIoRedirection( bool value )
{
    ioRedirection = value;
    if ( ioRedirection ) {
    if ( d->notifierStdout )
        d->notifierStdout->setEnabled( TRUE );
    if ( d->notifierStderr )
        d->notifierStderr->setEnabled( TRUE );
    } else {
    if ( d->notifierStdout )
        d->notifierStdout->setEnabled( FALSE );
    if ( d->notifierStderr )
        d->notifierStderr->setEnabled( FALSE );
    }
}

/*
  This private function is used by connectNotify() and
  disconnectNotify() to change the value of notifyOnExit (and related
  behaviour)
*/
void QProcess::setNotifyOnExit( bool value )
{
    notifyOnExit = value;
}

/*
  This private function is used by connectNotify() and disconnectNotify() to
  change the value of wroteToStdinConnected (and related behaviour)
*/
void QProcess::setWroteStdinConnected( bool value )
{
    wroteToStdinConnected = value;
}

QProcess::PID QProcess::processIdentifier()
{
    if ( d->proc == 0 )
    return -1;
    return d->proc->pid;
}

#endif // QT_NO_PROCESS

This file is part of the documentation for OPIE Version 1.5.5.

Documentation copyright © 1997-2003 the KDE developers. 2003 OPIE developers
Generated on Tue Feb 10 20:24:08 2004 by doxygen 1.3.5 written by Dimitri van Heesch, © 1997-2001