From 15318cad33835e4e2dc620d033e43cd930676cdd Mon Sep 17 00:00:00 2001
From: kergoth <kergoth>
Date: Fri, 25 Jan 2002 22:14:26 +0000
Subject: Initial revision

---
(limited to 'library/qprocess_unix.cpp')

diff --git a/library/qprocess_unix.cpp b/library/qprocess_unix.cpp
new file mode 100644
index 0000000..cb421c2
--- a/dev/null
+++ b/library/qprocess_unix.cpp
@@ -0,0 +1,1157 @@
+/****************************************************************************
+** $Id$
+**
+** 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
+ *
+ **********************************************************************/
+/*!
+  This private class does basic initialization.
+*/
+void QProcess::init()
+{
+    d = new QProcessPrivate();
+    exitStat = 0;
+    exitNormal = FALSE;
+}
+
+/*!
+  This private class resets the process variables, etc. so that it can be used
+  for another process to start.
+*/
+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;
+    }
+}
+
+/*!
+  Destroys the class.
+
+  If the process is running, it is NOT terminated! Standard input, standard
+  output and standard error of the process are closed.
+
+  You can connect the destroyed() signal to the kill() slot, if you want the
+  process to be terminated automatically when the class is destroyed.
+
+  \sa tryTerminate() kill()
+*/
+QProcess::~QProcess()
+{
+    delete d;
+}
+
+/*!
+  Tries to run a process for the command and arguments that were specified with
+  setArguments(), addArgument() or that were specified in the constructor. The
+  command is searched in the path for executable programs; you can also use an
+  absolute path to the command.
+
+  If \a env is null, then the process is started with the same environment as
+  the starting process. If \a env is non-null, then the values in the
+  stringlist are interpreted as environment setttings of the form \c
+  {key=value} and the process is started in these environment settings. For
+  convenience, there is a small exception to this rule: under Unix, if \a env
+  does not contain any settings for the environment variable \c
+  LD_LIBRARY_PATH, then this variable is inherited from the starting process;
+  under Windows the same applies for the enverionment varialbe \c PATH.
+
+  Returns TRUE if the process could be started, otherwise FALSE.
+
+  You can write data to standard input of the process with
+  writeToStdin(), you can close standard input with closeStdin() and you can
+  terminate the process tryTerminate() resp. kill().
+
+  You can call this function even when there already is a running
+  process in this object. In this case, QProcess closes standard input
+  of the old process and deletes pending data, i.e., you loose all
+  control over that process, but the process is not terminated. This applies
+  also if the process could not be started. (On operating systems that have
+  zombie processes, Qt will also wait() on the old process.)
+
+  \sa launch() closeStdin()
+*/
+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;
+}
+
+
+/*!
+  Asks the process to terminate. Processes can ignore this wish. If you want to
+  be sure that the process really terminates, you must use kill() instead.
+
+  The slot returns immediately: it does not wait until the process has
+  finished. When the process really exited, the signal processExited() is
+  emitted.
+
+  \sa kill() processExited()
+*/
+void QProcess::tryTerminate() const
+{
+    if ( d->proc != 0 )
+	::kill( d->proc->pid, SIGTERM );
+}
+
+/*!
+  Terminates the process. This is not a safe way to end a process since the
+  process will not be able to do cleanup. tryTerminate() is a safer way to do
+  it, but processes might ignore a tryTerminate().
+
+  The nice way to end a process and to be sure that it is finished, is doing
+  something like this:
+  \code
+    process->tryTerminate();
+    QTimer::singleShot( 5000, process, SLOT( kill() ) );
+  \endcode
+
+  This tries to terminate the process the nice way. If the process is still
+  running after 5 seconds, it terminates the process the hard way. The timeout
+  should be chosen depending on the time the process needs to do all the
+  cleanup: use a higher value if the process is likely to do heavy computation
+  on cleanup.
+
+  The slot returns immediately: it does not wait until the process has
+  finished. When the process really exited, the signal processExited() is
+  emitted.
+
+  \sa tryTerminate() processExited()
+*/
+void QProcess::kill() const
+{
+    if ( d->proc != 0 )
+	::kill( d->proc->pid, SIGKILL );
+}
+
+/*!
+  Returns TRUE if the process is running, otherwise FALSE.
+
+  \sa normalExit() exitStatus() processExited()
+*/
+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;
+}
+
+/*!
+  Writes the data \a buf to the standard input of the process. The process may
+  or may not read this data.
+
+  This function returns immediately; the QProcess class might write the data at
+  a later point (you have to enter the event loop for that). When all the data
+  is written to the process, the signal wroteToStdin() is emitted. This does
+  not mean that the process really read the data, since this class only detects
+  when it was able to write the data to the operating system.
+
+  \sa wroteToStdin() closeStdin() readStdout() readStderr()
+*/
+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 );
+}
+
+
+/*!
+  Closes standard input of the process.
+
+  This function also deletes pending data that is not written to standard input
+  yet.
+
+  \sa wroteToStdin()
+*/
+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 );
+    }
+}
+
+/*!
+  \internal
+  Flushes standard input. This is useful if you want to use QProcess in a
+  synchronous manner.
+
+  This function should probably go into the public API.
+*/
+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;
+}
+
+/*! \enum QProcess::PID
+  \internal
+*/
+/*!
+  Returns platform dependent information about the process. This can be used
+  together with platform specific system calls.
+
+  Under Unix the return value is the PID of the process, or -1 if no process is
+  belonging to this object.
+
+  Under Windows it is a pointer to the \c PROCESS_INFORMATION struct, or 0 if
+  no process is belonging to this object.
+*/
+QProcess::PID QProcess::processIdentifier()
+{
+    if ( d->proc == 0 )
+	return -1;
+    return d->proc->pid;
+}
+
+#endif // QT_NO_PROCESS
--
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