/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
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****************************************************************************/
//#define QPROCESS_DEBUG
#if defined QPROCESS_DEBUG
#include <qdebug.h>
#include <qstring.h>
#include <ctype.h>
#if !defined(Q_OS_WINCE)
#include <errno.h>
#endif
QT_BEGIN_NAMESPACE
/*
Returns a human readable representation of the first \a len
characters in \a data.
*/
static QByteArray qt_prettyDebug(const char *data, int len, int maxSize)
{
if (!data) return "(null)";
QByteArray out;
for (int i = 0; i < len && i < maxSize; ++i) {
char c = data[i];
if (isprint(c)) {
out += c;
} else switch (c) {
case '\n': out += "\\n"; break;
case '\r': out += "\\r"; break;
case '\t': out += "\\t"; break;
default:
char buf[5];
qsnprintf(buf, sizeof(buf), "\\%3o", c);
buf[4] = '\0';
out += QByteArray(buf);
}
}
if (len < maxSize)
out += "...";
return out;
}
QT_END_NAMESPACE
#endif
#include "qprocess.h"
#include "qprocess_p.h"
#include <qbytearray.h>
#include <qdatetime.h>
#include <qcoreapplication.h>
#include <qsocketnotifier.h>
#include <qtimer.h>
#ifdef Q_WS_WIN
#include <private/qwineventnotifier_p.h>
#endif
#ifdef Q_OS_SYMBIAN
#include <e32std.h>
#endif
#ifndef QT_NO_PROCESS
QT_BEGIN_NAMESPACE
/*!
\class QProcessEnvironment
\brief The QProcessEnvironment class holds the environment variables that
can be passed to a program.
\ingroup io
\ingroup misc
\mainclass
\reentrant
\since 4.6
A process's environment is composed of a set of key=value pairs known as
environment variables. The QProcessEnvironment class wraps that concept
and allows easy manipulation of those variables. It's meant to be used
along with QProcess, to set the environment for child processes. It
cannot be used to change the current process's environment.
The environment of the calling process can be obtained using
QProcessEnvironment::systemEnvironment().
On Unix systems, the variable names are case-sensitive. For that reason,
this class will not touch the names of the variables. Note as well that
Unix environment allows both variable names and contents to contain arbitrary
binary data (except for the NUL character), but this is not supported by
QProcessEnvironment. This class only supports names and values that are
encodable by the current locale settings (see QTextCodec::codecForLocale).
On Windows, the variable names are case-insensitive. Therefore,
QProcessEnvironment will always uppercase the names and do case-insensitive
comparisons.
On Windows CE, the concept of environment does not exist. This class will
keep the values set for compatibility with other platforms, but the values
set will have no effect on the processes being created.
\sa QProcess, QProcess::systemEnvironment(), QProcess::setProcessEnvironment()
*/
#ifdef Q_OS_WIN
static inline QProcessEnvironmentPrivate::Unit prepareName(const QString &name)
{ return name.toUpper(); }
static inline QProcessEnvironmentPrivate::Unit prepareName(const QByteArray &name)
{ return QString::fromLocal8Bit(name).toUpper(); }
static inline QString nameToString(const QProcessEnvironmentPrivate::Unit &name)
{ return name; }
static inline QProcessEnvironmentPrivate::Unit prepareValue(const QString &value)
{ return value; }
static inline QProcessEnvironmentPrivate::Unit prepareValue(const QByteArray &value)
{ return QString::fromLocal8Bit(value); }
static inline QString valueToString(const QProcessEnvironmentPrivate::Unit &value)
{ return value; }
static inline QByteArray valueToByteArray(const QProcessEnvironmentPrivate::Unit &value)
{ return value.toLocal8Bit(); }
#else
static inline QProcessEnvironmentPrivate::Unit prepareName(const QByteArray &name)
{ return name; }
static inline QProcessEnvironmentPrivate::Unit prepareName(const QString &name)
{ return name.toLocal8Bit(); }
static inline QString nameToString(const QProcessEnvironmentPrivate::Unit &name)
{ return QString::fromLocal8Bit(name); }
static inline QProcessEnvironmentPrivate::Unit prepareValue(const QByteArray &value)
{ return value; }
static inline QProcessEnvironmentPrivate::Unit prepareValue(const QString &value)
{ return value.toLocal8Bit(); }
static inline QString valueToString(const QProcessEnvironmentPrivate::Unit &value)
{ return QString::fromLocal8Bit(value); }
static inline QByteArray valueToByteArray(const QProcessEnvironmentPrivate::Unit &value)
{ return value; }
#endif
template<> void QSharedDataPointer<QProcessEnvironmentPrivate>::detach()
{
if (d && d->ref == 1)
return;
QProcessEnvironmentPrivate *x = (d ? new QProcessEnvironmentPrivate(*d)
: new QProcessEnvironmentPrivate);
x->ref.ref();
if (d && !d->ref.deref())
delete d;
d = x;
}
QStringList QProcessEnvironmentPrivate::toList() const
{
QStringList result;
QHash<Unit, Unit>::ConstIterator it = hash.constBegin(),
end = hash.constEnd();
for ( ; it != end; ++it) {
QString data = nameToString(it.key());
QString value = valueToString(it.value());
data.reserve(data.length() + value.length() + 1);
data.append(QLatin1Char('='));
data.append(value);
result << data;
}
return result;
}
QProcessEnvironment QProcessEnvironmentPrivate::fromList(const QStringList &list)
{
QProcessEnvironment env;
QStringList::ConstIterator it = list.constBegin(),
end = list.constEnd();
for ( ; it != end; ++it) {
int pos = it->indexOf(QLatin1Char('='));
if (pos < 1)
continue;
QString value = it->mid(pos + 1);
QString name = *it;
name.truncate(pos);
env.insert(name, value);
}
return env;
}
/*!
Creates a new QProcessEnvironment object. This constructor creates an
empty environment. If set on a QProcess, this will cause the current
environment variables to be removed.
*/
QProcessEnvironment::QProcessEnvironment()
: d(0)
{
}
/*!
Frees the resources associated with this QProcessEnvironment object.
*/
QProcessEnvironment::~QProcessEnvironment()
{
}
/*!
Creates a QProcessEnvironment object that is a copy of \a other.
*/
QProcessEnvironment::QProcessEnvironment(const QProcessEnvironment &other)
: d(other.d)
{
}
/*!
Copies the contents of the \a other QProcessEnvironment object into this
one.
*/
QProcessEnvironment &QProcessEnvironment::operator=(const QProcessEnvironment &other)
{
d = other.d;
return *this;
}
/*!
\fn bool QProcessEnvironment::operator !=(const QProcessEnvironment &other) const
Returns true if this and the \a other QProcessEnvironment objects are different.
\sa operator==()
*/
/*!
Returns true if this and the \a other QProcessEnvironment objects are equal.
Two QProcessEnvironment objects are considered equal if they have the same
set of key=value pairs. The comparison of keys is done case-sensitive on
platforms where the environment is case-sensitive.
\sa operator!=(), contains()
*/
bool QProcessEnvironment::operator==(const QProcessEnvironment &other) const
{
return d == other.d || (d && other.d && d->hash == other.d->hash);
}
/*!
Returns true if this QProcessEnvironment object is empty: that is
there are no key=value pairs set.
\sa clear(), systemEnvironment(), insert()
*/
bool QProcessEnvironment::isEmpty() const
{
return d ? d->hash.isEmpty() : true;
}
/*!
Removes all key=value pairs from this QProcessEnvironment object, making
it empty.
\sa isEmpty(), systemEnvironment()
*/
void QProcessEnvironment::clear()
{
if (d)
d->hash.clear();
}
/*!
Returns true if the environment variable of name \a name is found in
this QProcessEnvironment object.
On Windows, variable names are case-insensitive, so the key is converted
to uppercase before searching. On other systems, names are case-sensitive
so no trasformation is applied.
\sa insert(), value()
*/
bool QProcessEnvironment::contains(const QString &name) const
{
return d ? d->hash.contains(prepareName(name)) : false;
}
/*!
Inserts the environment variable of name \a name and contents \a value
into this QProcessEnvironment object. If that variable already existed,
it is replaced by the new value.
On Windows, variable names are case-insensitive, so this function always
uppercases the variable name before inserting. On other systems, names
are case-sensitive, so no transformation is applied.
On most systems, inserting a variable with no contents will have the
same effect for applications as if the variable had not been set at all.
However, to guarantee that there are no incompatibilities, to remove a
variable, please use the remove() function.
\sa contains(), remove(), value()
*/
void QProcessEnvironment::insert(const QString &name, const QString &value)
{
// d detaches from null
d->hash.insert(prepareName(name), prepareValue(value));
}
/*!
Removes the environment variable identified by \a name from this
QProcessEnvironment object. If that variable did not exist before,
nothing happens.
On Windows, variable names are case-insensitive, so the key is converted
to uppercase before searching. On other systems, names are case-sensitive
so no trasformation is applied.
\sa contains(), insert(), value()
*/
void QProcessEnvironment::remove(const QString &name)
{
if (d)
d->hash.remove(prepareName(name));
}
/*!
Searches this QProcessEnvironment object for a variable identified by
\a name and returns its value. If the variable is not found in this object,
then \a defaultValue is returned instead.
On Windows, variable names are case-insensitive, so the key is converted
to uppercase before searching. On other systems, names are case-sensitive
so no trasformation is applied.
\sa contains(), insert(), remove()
*/
QString QProcessEnvironment::value(const QString &name, const QString &defaultValue) const
{
if (!d)
return defaultValue;
QProcessEnvironmentPrivate::Hash::ConstIterator it = d->hash.constFind(prepareName(name));
if (it == d->hash.constEnd())
return defaultValue;
return valueToString(it.value());
}
/*!
Converts this QProcessEnvironment object into a list of strings, one for
each environment variable that is set. The environment variable's name
and its value are separated by an equal character ('=').
The QStringList contents returned by this function are suitable for use
with the QProcess::setEnvironment function. However, it is recommended
to use QProcess::setProcessEnvironment instead since that will avoid
unnecessary copying of the data.
\sa systemEnvironment(), QProcess::systemEnvironment(), QProcess::environment(),
QProcess::setEnvironment()
*/
QStringList QProcessEnvironment::toStringList() const
{
return d ? d->toList() : QStringList();
}
void QProcessPrivate::Channel::clear()
{
switch (type) {
case PipeSource:
Q_ASSERT(process);
process->stdinChannel.type = Normal;
process->stdinChannel.process = 0;
break;
case PipeSink:
Q_ASSERT(process);
process->stdoutChannel.type = Normal;
process->stdoutChannel.process = 0;
break;
}
type = Normal;
file.clear();
process = 0;
}
/*! \fn bool QProcessPrivate::startDetached(const QString &program, const QStringList &arguments, const QString &workingDirectory, qint64 *pid)
\internal
*/
/*!
\class QProcess
\brief The QProcess class is used to start external programs and
to communicate with them.
\ingroup io
\reentrant
\section1 Running a Process
To start a process, pass the name and command line arguments of
the program you want to run as arguments to start(). Arguments
are supplied as individual strings in a QStringList.
For example, the following code snippet runs the analog clock
example in the Motif style on X11 platforms by passing strings
containing "-style" and "motif" as two items in the list of
arguments:
\snippet doc/src/snippets/qprocess/qprocess-simpleexecution.cpp 0
\dots
\snippet doc/src/snippets/qprocess/qprocess-simpleexecution.cpp 1
\snippet doc/src/snippets/qprocess/qprocess-simpleexecution.cpp 2
QProcess then enters the \l Starting state, and when the program
has started, QProcess enters the \l Running state and emits
started().
QProcess allows you to treat a process as a sequential I/O
device. You can write to and read from the process just as you
would access a network connection using QTcpSocket. You can then
write to the process's standard input by calling write(), and
read the standard output by calling read(), readLine(), and
getChar(). Because it inherits QIODevice, QProcess can also be
used as an input source for QXmlReader, or for generating data to
be uploaded using QFtp.
\note On Windows CE and Symbian, reading and writing to a process
is not supported.
When the process exits, QProcess reenters the \l NotRunning state
(the initial state), and emits finished().
The finished() signal provides the exit code and exit status of
the process as arguments, and you can also call exitCode() to
obtain the exit code of the last process that finished, and
exitStatus() to obtain its exit status. If an error occurs at
any point in time, QProcess will emit the error() signal. You
can also call error() to find the type of error that occurred
last, and state() to find the current process state.
\section1 Communicating via Channels
Processes have two predefined output channels: The standard
output channel (\c stdout) supplies regular console output, and
the standard error channel (\c stderr) usually supplies the
errors that are printed by the process. These channels represent
two separate streams of data. You can toggle between them by
calling setReadChannel(). QProcess emits readyRead() when data is
available on the current read channel. It also emits
readyReadStandardOutput() when new standard output data is
available, and when new standard error data is available,
readyReadStandardError() is emitted. Instead of calling read(),
readLine(), or getChar(), you can explicitly read all data from
either of the two channels by calling readAllStandardOutput() or
readAllStandardError().
The terminology for the channels can be misleading. Be aware that
the process's output channels correspond to QProcess's
\e read channels, whereas the process's input channels correspond
to QProcess's \e write channels. This is because what we read
using QProcess is the process's output, and what we write becomes
the process's input.
QProcess can merge the two output channels, so that standard
output and standard error data from the running process both use
the standard output channel. Call setProcessChannelMode() with
MergedChannels before starting the process to activative
this feature. You also have the option of forwarding the output of
the running process to the calling, main process, by passing
ForwardedChannels as the argument.
Certain processes need special environment settings in order to
operate. You can set environment variables for your process by
calling setEnvironment(). To set a working directory, call
setWorkingDirectory(). By default, processes are run in the
current working directory of the calling process.
\note On Symbian, setting environment or working directory
is not supported. The working directory will always be the private
directory of the running process.
\section1 Synchronous Process API
QProcess provides a set of functions which allow it to be used
without an event loop, by suspending the calling thread until
certain signals are emitted:
\list
\o waitForStarted() blocks until the process has started.
\o waitForReadyRead() blocks until new data is
available for reading on the current read channel.
\o waitForBytesWritten() blocks until one payload of
data has been written to the process.
\o waitForFinished() blocks until the process has finished.
\endlist
Calling these functions from the main thread (the thread that
calls QApplication::exec()) may cause your user interface to
freeze.
The following example runs \c gzip to compress the string "Qt
rocks!", without an event loop:
\snippet doc/src/snippets/process/process.cpp 0
\section1 Notes for Windows Users
Some Windows commands (for example, \c dir) are not provided by
separate applications, but by the command interpreter itself.
If you attempt to use QProcess to execute these commands directly,
it won't work. One possible solution is to execute the command
interpreter itself (\c{cmd.exe} on some Windows systems), and ask
the interpreter to execute the desired command.
\section1 Symbian Platform Security Requirements
On Symbian, processes which use the functions kill() or terminate()
must have the \c PowerMgmt platform security capability. If the client
process lacks this capability, these functions will fail.
Platform security capabilities are added via the
\l{qmake-variable-reference.html#target-capability}{TARGET.CAPABILITY}
qmake variable.
\sa QBuffer, QFile, QTcpSocket
*/
/*!
\enum QProcess::ProcessChannel
This enum describes the process channels used by the running process.
Pass one of these values to setReadChannel() to set the
current read channel of QProcess.
\value StandardOutput The standard output (stdout) of the running
process.
\value StandardError The standard error (stderr) of the running
process.
\sa setReadChannel()
*/
/*!
\enum QProcess::ProcessChannelMode
This enum describes the process channel modes of QProcess. Pass
one of these values to setProcessChannelMode() to set the
current read channel mode.
\value SeparateChannels QProcess manages the output of the
running process, keeping standard output and standard error data
in separate internal buffers. You can select the QProcess's
current read channel by calling setReadChannel(). This is the
default channel mode of QProcess.
\value MergedChannels QProcess merges the output of the running
process into the standard output channel (\c stdout). The
standard error channel (\c stderr) will not receive any data. The
standard output and standard error data of the running process
are interleaved.
\value ForwardedChannels QProcess forwards the output of the
running process onto the main process. Anything the child process
writes to its standard output and standard error will be written
to the standard output and standard error of the main process.
\sa setProcessChannelMode()
*/
/*!
\enum QProcess::ProcessError
This enum describes the different types of errors that are
reported by QProcess.
\value FailedToStart The process failed to start. Either the
invoked program is missing, or you may have insufficient
permissions to invoke the program.
\value Crashed The process crashed some time after starting
successfully.
\value Timedout The last waitFor...() function timed out. The
state of QProcess is unchanged, and you can try calling
waitFor...() again.
\value WriteError An error occurred when attempting to write to the
process. For example, the process may not be running, or it may
have closed its input channel.
\value ReadError An error occurred when attempting to read from
the process. For example, the process may not be running.
\value UnknownError An unknown error occurred. This is the default
return value of error().
\sa error()
*/
/*!
\enum QProcess::ProcessState
This enum describes the different states of QProcess.
\value NotRunning The process is not running.
\value Starting The process is starting, but the program has not
yet been invoked.
\value Running The process is running and is ready for reading and
writing.
\sa state()
*/
/*!
\enum QProcess::ExitStatus
This enum describes the different exit statuses of QProcess.
\value NormalExit The process exited normally.
\value CrashExit The process crashed.
\sa exitStatus()
*/
/*!
\fn void QProcess::error(QProcess::ProcessError error)
This signal is emitted when an error occurs with the process. The
specified \a error describes the type of error that occurred.
*/
/*!
\fn void QProcess::started()
This signal is emitted by QProcess when the process has started,
and state() returns \l Running.
*/
/*!
\fn void QProcess::stateChanged(QProcess::ProcessState newState)
This signal is emitted whenever the state of QProcess changes. The
\a newState argument is the state QProcess changed to.
*/
/*!
\fn void QProcess::finished(int exitCode)
\obsolete
\overload
Use finished(int exitCode, QProcess::ExitStatus status) instead.
*/
/*!
\fn void QProcess::finished(int exitCode, QProcess::ExitStatus exitStatus)
This signal is emitted when the process finishes. \a exitCode is the exit
code of the process, and \a exitStatus is the exit status. After the
process has finished, the buffers in QProcess are still intact. You can
still read any data that the process may have written before it finished.
\sa exitStatus()
*/
/*!
\fn void QProcess::readyReadStandardOutput()
This signal is emitted when the process has made new data
available through its standard output channel (\c stdout). It is
emitted regardless of the current \l{readChannel()}{read channel}.
\sa readAllStandardOutput(), readChannel()
*/
/*!
\fn void QProcess::readyReadStandardError()
This signal is emitted when the process has made new data
available through its standard error channel (\c stderr). It is
emitted regardless of the current \l{readChannel()}{read
channel}.
\sa readAllStandardError(), readChannel()
*/
/*! \internal
*/
QProcessPrivate::QProcessPrivate()
{
processChannel = QProcess::StandardOutput;
processChannelMode = QProcess::SeparateChannels;
processError = QProcess::UnknownError;
processState = QProcess::NotRunning;
pid = 0;
sequenceNumber = 0;
exitCode = 0;
exitStatus = QProcess::NormalExit;
startupSocketNotifier = 0;
deathNotifier = 0;
notifier = 0;
pipeWriter = 0;
childStartedPipe[0] = INVALID_Q_PIPE;
childStartedPipe[1] = INVALID_Q_PIPE;
deathPipe[0] = INVALID_Q_PIPE;
deathPipe[1] = INVALID_Q_PIPE;
exitCode = 0;
crashed = false;
dying = false;
emittedReadyRead = false;
emittedBytesWritten = false;
#ifdef Q_WS_WIN
pipeWriter = 0;
processFinishedNotifier = 0;
#endif // Q_WS_WIN
#ifdef Q_OS_UNIX
serial = 0;
#endif
#ifdef Q_OS_SYMBIAN
symbianProcess = NULL;
processLaunched = false;
#endif
}
/*! \internal
*/
QProcessPrivate::~QProcessPrivate()
{
if (stdinChannel.process)
stdinChannel.process->stdoutChannel.clear();
if (stdoutChannel.process)
stdoutChannel.process->stdinChannel.clear();
}
/*! \internal
*/
void QProcessPrivate::cleanup()
{
q_func()->setProcessState(QProcess::NotRunning);
#ifdef Q_OS_WIN
if (pid) {
CloseHandle(pid->hThread);
CloseHandle(pid->hProcess);
delete pid;
pid = 0;
}
if (processFinishedNotifier) {
processFinishedNotifier->setEnabled(false);
qDeleteInEventHandler(processFinishedNotifier);
processFinishedNotifier = 0;
}
#endif
pid = 0;
sequenceNumber = 0;
dying = false;
if (stdoutChannel.notifier) {
stdoutChannel.notifier->setEnabled(false);
qDeleteInEventHandler(stdoutChannel.notifier);
stdoutChannel.notifier = 0;
}
if (stderrChannel.notifier) {
stderrChannel.notifier->setEnabled(false);
qDeleteInEventHandler(stderrChannel.notifier);
stderrChannel.notifier = 0;
}
if (stdinChannel.notifier) {
stdinChannel.notifier->setEnabled(false);
qDeleteInEventHandler(stdinChannel.notifier);
stdinChannel.notifier = 0;
}
if (startupSocketNotifier) {
startupSocketNotifier->setEnabled(false);
qDeleteInEventHandler(startupSocketNotifier);
startupSocketNotifier = 0;
}
if (deathNotifier) {
deathNotifier->setEnabled(false);
qDeleteInEventHandler(deathNotifier);
deathNotifier = 0;
}
if (notifier) {
qDeleteInEventHandler(notifier);
notifier = 0;
}
destroyPipe(stdoutChannel.pipe);
destroyPipe(stderrChannel.pipe);
destroyPipe(stdinChannel.pipe);
destroyPipe(childStartedPipe);
destroyPipe(deathPipe);
#ifdef Q_OS_UNIX
serial = 0;
#endif
#ifdef Q_OS_SYMBIAN
if (symbianProcess) {
symbianProcess->Close();
delete symbianProcess;
symbianProcess = NULL;
}
#endif
}
/*! \internal
*/
bool QProcessPrivate::_q_canReadStandardOutput()
{
Q_Q(QProcess);
qint64 available = bytesAvailableFromStdout();
if (available == 0) {
if (stdoutChannel.notifier)
stdoutChannel.notifier->setEnabled(false);
destroyPipe(stdoutChannel.pipe);
#if defined QPROCESS_DEBUG
qDebug("QProcessPrivate::canReadStandardOutput(), 0 bytes available");
#endif
return false;
}
char *ptr = outputReadBuffer.reserve(available);
qint64 readBytes = readFromStdout(ptr, available);
if (readBytes == -1) {
processError = QProcess::ReadError;
q->setErrorString(QProcess::tr("Error reading from process"));
emit q->error(processError);
#if defined QPROCESS_DEBUG
qDebug("QProcessPrivate::canReadStandardOutput(), failed to read from the process");
#endif
return false;
}
#if defined QPROCESS_DEBUG
qDebug("QProcessPrivate::canReadStandardOutput(), read %d bytes from the process' output",
int(readBytes));
#endif
if (stdoutChannel.closed) {
outputReadBuffer.chop(readBytes);
return false;
}
outputReadBuffer.chop(available - readBytes);
bool didRead = false;
if (readBytes == 0) {
if (stdoutChannel.notifier)
stdoutChannel.notifier->setEnabled(false);
} else if (processChannel == QProcess::StandardOutput) {
didRead = true;
if (!emittedReadyRead) {
emittedReadyRead = true;
emit q->readyRead();
emittedReadyRead = false;
}
}
emit q->readyReadStandardOutput();
return didRead;
}
/*! \internal
*/
bool QProcessPrivate::_q_canReadStandardError()
{
Q_Q(QProcess);
qint64 available = bytesAvailableFromStderr();
if (available == 0) {
if (stderrChannel.notifier)
stderrChannel.notifier->setEnabled(false);
destroyPipe(stderrChannel.pipe);
return false;
}
char *ptr = errorReadBuffer.reserve(available);
qint64 readBytes = readFromStderr(ptr, available);
if (readBytes == -1) {
processError = QProcess::ReadError;
q->setErrorString(QProcess::tr("Error reading from process"));
emit q->error(processError);
return false;
}
if (stderrChannel.closed) {
errorReadBuffer.chop(readBytes);
return false;
}
errorReadBuffer.chop(available - readBytes);
bool didRead = false;
if (readBytes == 0) {
if (stderrChannel.notifier)
stderrChannel.notifier->setEnabled(false);
} else if (processChannel == QProcess::StandardError) {
didRead = true;
if (!emittedReadyRead) {
emittedReadyRead = true;
emit q->readyRead();
emittedReadyRead = false;
}
}
emit q->readyReadStandardError();
return didRead;
}
/*! \internal
*/
bool QProcessPrivate::_q_canWrite()
{
Q_Q(QProcess);
if (stdinChannel.notifier)
stdinChannel.notifier->setEnabled(false);
if (writeBuffer.isEmpty()) {
#if defined QPROCESS_DEBUG
qDebug("QProcessPrivate::canWrite(), not writing anything (empty write buffer).");
#endif
return false;
}
qint64 written = writeToStdin(writeBuffer.readPointer(),
writeBuffer.nextDataBlockSize());
if (written < 0) {
destroyPipe(stdinChannel.pipe);
processError = QProcess::WriteError;
q->setErrorString(QProcess::tr("Error writing to process"));
#if defined(QPROCESS_DEBUG) && !defined(Q_OS_WINCE)
qDebug("QProcessPrivate::canWrite(), failed to write (%s)", strerror(errno));
#endif
emit q->error(processError);
return false;
}
#if defined QPROCESS_DEBUG
qDebug("QProcessPrivate::canWrite(), wrote %d bytes to the process input", int(written));
#endif
writeBuffer.free(written);
if (!emittedBytesWritten) {
emittedBytesWritten = true;
emit q->bytesWritten(written);
emittedBytesWritten = false;
}
if (stdinChannel.notifier && !writeBuffer.isEmpty())
stdinChannel.notifier->setEnabled(true);
if (writeBuffer.isEmpty() && stdinChannel.closed)
closeWriteChannel();
return true;
}
/*! \internal
*/
bool QProcessPrivate::_q_processDied()
{
Q_Q(QProcess);
#if defined QPROCESS_DEBUG
qDebug("QProcessPrivate::_q_processDied()");
#endif
#ifdef Q_OS_UNIX
if (!waitForDeadChild())
return false;
#endif
#ifdef Q_OS_WIN
if (processFinishedNotifier)
processFinishedNotifier->setEnabled(false);
#endif
// the process may have died before it got a chance to report that it was
// either running or stopped, so we will call _q_startupNotification() and
// give it a chance to emit started() or error(FailedToStart).
if (processState == QProcess::Starting) {
if (!_q_startupNotification())
return true;
}
if (dying) {
// at this point we know the process is dead. prevent
// reentering this slot recursively by calling waitForFinished()
// or opening a dialog inside slots connected to the readyRead
// signals emitted below.
return true;
}
dying = true;
// in case there is data in the pipe line and this slot by chance
// got called before the read notifications, call these two slots
// so the data is made available before the process dies.
_q_canReadStandardOutput();
_q_canReadStandardError();
findExitCode();
if (crashed) {
exitStatus = QProcess::CrashExit;
processError = QProcess::Crashed;
q->setErrorString(QProcess::tr("Process crashed"));
emit q->error(processError);
}
bool wasRunning = (processState == QProcess::Running);
cleanup();
if (wasRunning) {
// we received EOF now:
emit q->readChannelFinished();
// in the future:
//emit q->standardOutputClosed();
//emit q->standardErrorClosed();
emit q->finished(exitCode);
emit q->finished(exitCode, exitStatus);
}
#if defined QPROCESS_DEBUG
qDebug("QProcessPrivate::_q_processDied() process is dead");
#endif
return true;
}
/*! \internal
*/
bool QProcessPrivate::_q_startupNotification()
{
Q_Q(QProcess);
#if defined QPROCESS_DEBUG
qDebug("QProcessPrivate::startupNotification()");
#endif
if (startupSocketNotifier)
startupSocketNotifier->setEnabled(false);
if (processStarted()) {
q->setProcessState(QProcess::Running);
emit q->started();
return true;
}
q->setProcessState(QProcess::NotRunning);
processError = QProcess::FailedToStart;
emit q->error(processError);
#ifdef Q_OS_UNIX
// make sure the process manager removes this entry
waitForDeadChild();
findExitCode();
#endif
cleanup();
return false;
}
/*! \internal
*/
void QProcessPrivate::closeWriteChannel()
{
#if defined QPROCESS_DEBUG
qDebug("QProcessPrivate::closeWriteChannel()");
#endif
if (stdinChannel.notifier) {
extern void qDeleteInEventHandler(QObject *o);
stdinChannel.notifier->setEnabled(false);
if (stdinChannel.notifier) {
qDeleteInEventHandler(stdinChannel.notifier);
stdinChannel.notifier = 0;
}
}
#ifdef Q_OS_WIN
// ### Find a better fix, feeding the process little by little
// instead.
flushPipeWriter();
#endif
destroyPipe(stdinChannel.pipe);
}
/*!
Constructs a QProcess object with the given \a parent.
*/
QProcess::QProcess(QObject *parent)
: QIODevice(*new QProcessPrivate, parent)
{
#if defined QPROCESS_DEBUG
qDebug("QProcess::QProcess(%p)", parent);
#endif
}
/*!
Destructs the QProcess object, i.e., killing the process.
Note that this function will not return until the process is
terminated.
*/
QProcess::~QProcess()
{
Q_D(QProcess);
if (d->processState != NotRunning) {
qWarning("QProcess: Destroyed while process is still running.");
kill();
waitForFinished();
}
#ifdef Q_OS_UNIX
// make sure the process manager removes this entry
d->findExitCode();
#endif
d->cleanup();
}
/*!
\obsolete
Returns the read channel mode of the QProcess. This function is
equivalent to processChannelMode()
\sa processChannelMode()
*/
QProcess::ProcessChannelMode QProcess::readChannelMode() const
{
return processChannelMode();
}
/*!
\obsolete
Use setProcessChannelMode(\a mode) instead.
\sa setProcessChannelMode()
*/
void QProcess::setReadChannelMode(ProcessChannelMode mode)
{
setProcessChannelMode(mode);
}
/*!
\since 4.2
Returns the channel mode of the QProcess standard output and
standard error channels.
\sa setProcessChannelMode(), ProcessChannelMode, setReadChannel()
*/
QProcess::ProcessChannelMode QProcess::processChannelMode() const
{
Q_D(const QProcess);
return d->processChannelMode;
}
/*!
\since 4.2
Sets the channel mode of the QProcess standard output and standard
error channels to the \a mode specified.
This mode will be used the next time start() is called. For example:
\snippet doc/src/snippets/code/src_corelib_io_qprocess.cpp 0
\sa processChannelMode(), ProcessChannelMode, setReadChannel()
*/
void QProcess::setProcessChannelMode(ProcessChannelMode mode)
{
Q_D(QProcess);
d->processChannelMode = mode;
}
/*!
Returns the current read channel of the QProcess.
\sa setReadChannel()
*/
QProcess::ProcessChannel QProcess::readChannel() const
{
Q_D(const QProcess);
return d->processChannel;
}
/*!
Sets the current read channel of the QProcess to the given \a
channel. The current input channel is used by the functions
read(), readAll(), readLine(), and getChar(). It also determines
which channel triggers QProcess to emit readyRead().
\sa readChannel()
*/
void QProcess::setReadChannel(ProcessChannel channel)
{
Q_D(QProcess);
if (d->processChannel != channel) {
QByteArray buf = d->buffer.readAll();
if (d->processChannel == QProcess::StandardOutput) {
for (int i = buf.size() - 1; i >= 0; --i)
d->outputReadBuffer.ungetChar(buf.at(i));
} else {
for (int i = buf.size() - 1; i >= 0; --i)
d->errorReadBuffer.ungetChar(buf.at(i));
}
}
d->processChannel = channel;
}
/*!
Closes the read channel \a channel. After calling this function,
QProcess will no longer receive data on the channel. Any data that
has already been received is still available for reading.
Call this function to save memory, if you are not interested in
the output of the process.
\sa closeWriteChannel(), setReadChannel()
*/
void QProcess::closeReadChannel(ProcessChannel channel)
{
Q_D(QProcess);
if (channel == StandardOutput)
d->stdoutChannel.closed = true;
else
d->stderrChannel.closed = true;
}
/*!
Schedules the write channel of QProcess to be closed. The channel
will close once all data has been written to the process. After
calling this function, any attempts to write to the process will
fail.
Closing the write channel is necessary for programs that read
input data until the channel has been closed. For example, the
program "more" is used to display text data in a console on both
Unix and Windows. But it will not display the text data until
QProcess's write channel has been closed. Example:
\snippet doc/src/snippets/code/src_corelib_io_qprocess.cpp 1
The write channel is implicitly opened when start() is called.
\sa closeReadChannel()
*/
void QProcess::closeWriteChannel()
{
Q_D(QProcess);
d->stdinChannel.closed = true; // closing
if (d->writeBuffer.isEmpty())
d->closeWriteChannel();
}
/*!
\since 4.2
Redirects the process' standard input to the file indicated by \a
fileName. When an input redirection is in place, the QProcess
object will be in read-only mode (calling write() will result in
error).
If the file \a fileName does not exist at the moment start() is
called or is not readable, starting the process will fail.
Calling setStandardInputFile() after the process has started has no
effect.
\sa setStandardOutputFile(), setStandardErrorFile(),
setStandardOutputProcess()
*/
void QProcess::setStandardInputFile(const QString &fileName)
{
Q_D(QProcess);
d->stdinChannel = fileName;
}
/*!
\since 4.2
Redirects the process' standard output to the file \a
fileName. When the redirection is in place, the standard output
read channel is closed: reading from it using read() will always
fail, as will readAllStandardOutput().
If the file \a fileName doesn't exist at the moment start() is
called, it will be created. If it cannot be created, the starting
will fail.
If the file exists and \a mode is QIODevice::Truncate, the file
will be truncated. Otherwise (if \a mode is QIODevice::Append),
the file will be appended to.
Calling setStandardOutputFile() after the process has started has
no effect.
\sa setStandardInputFile(), setStandardErrorFile(),
setStandardOutputProcess()
*/
void QProcess::setStandardOutputFile(const QString &fileName, OpenMode mode)
{
Q_ASSERT(mode == Append || mode == Truncate);
Q_D(QProcess);
d->stdoutChannel = fileName;
d->stdoutChannel.append = mode == Append;
}
/*!
\since 4.2
Redirects the process' standard error to the file \a
fileName. When the redirection is in place, the standard error
read channel is closed: reading from it using read() will always
fail, as will readAllStandardError(). The file will be appended to
if \a mode is Append, otherwise, it will be truncated.
See setStandardOutputFile() for more information on how the file
is opened.
Note: if setProcessChannelMode() was called with an argument of
QProcess::MergedChannels, this function has no effect.
\sa setStandardInputFile(), setStandardOutputFile(),
setStandardOutputProcess()
*/
void QProcess::setStandardErrorFile(const QString &fileName, OpenMode mode)
{
Q_ASSERT(mode == Append || mode == Truncate);
Q_D(QProcess);
d->stderrChannel = fileName;
d->stderrChannel.append = mode == Append;
}
/*!
\since 4.2
Pipes the standard output stream of this process to the \a
destination process' standard input.
The following shell command:
\snippet doc/src/snippets/code/src_corelib_io_qprocess.cpp 2
Can be accomplished with QProcesses with the following code:
\snippet doc/src/snippets/code/src_corelib_io_qprocess.cpp 3
*/
void QProcess::setStandardOutputProcess(QProcess *destination)
{
QProcessPrivate *dfrom = d_func();
QProcessPrivate *dto = destination->d_func();
dfrom->stdoutChannel.pipeTo(dto);
dto->stdinChannel.pipeFrom(dfrom);
}
/*!
If QProcess has been assigned a working directory, this function returns
the working directory that the QProcess will enter before the program has
started. Otherwise, (i.e., no directory has been assigned,) an empty
string is returned, and QProcess will use the application's current
working directory instead.
\sa setWorkingDirectory()
*/
QString QProcess::workingDirectory() const
{
Q_D(const QProcess);
return d->workingDirectory;
}
/*!
Sets the working directory to \a dir. QProcess will start the
process in this directory. The default behavior is to start the
process in the working directory of the calling process.
\note The working directory setting is ignored on Symbian;
the private directory of the process is considered its working
directory.
\sa workingDirectory(), start()
*/
void QProcess::setWorkingDirectory(const QString &dir)
{
Q_D(QProcess);
d->workingDirectory = dir;
}
/*!
Returns the native process identifier for the running process, if
available. If no process is currently running, 0 is returned.
*/
Q_PID QProcess::pid() const
{
Q_D(const QProcess);
return d->pid;
}
/*! \reimp
This function operates on the current read channel.
\sa readChannel(), setReadChannel()
*/
bool QProcess::canReadLine() const
{
Q_D(const QProcess);
const QRingBuffer *readBuffer = (d->processChannel == QProcess::StandardError)
? &d->errorReadBuffer
: &d->outputReadBuffer;
return readBuffer->canReadLine() || QIODevice::canReadLine();
}
/*!
Closes all communication with the process and kills it. After calling this
function, QProcess will no longer emit readyRead(), and data can no
longer be read or written.
*/
void QProcess::close()
{
emit aboutToClose();
while (waitForBytesWritten(-1))
;
kill();
waitForFinished(-1);
QIODevice::close();
}
/*! \reimp
Returns true if the process is not running, and no more data is available
for reading; otherwise returns false.
*/
bool QProcess::atEnd() const
{
Q_D(const QProcess);
const QRingBuffer *readBuffer = (d->processChannel == QProcess::StandardError)
? &d->errorReadBuffer
: &d->outputReadBuffer;
return QIODevice::atEnd() && (!isOpen() || readBuffer->isEmpty());
}
/*! \reimp
*/
bool QProcess::isSequential() const
{
return true;
}
/*! \reimp
*/
qint64 QProcess::bytesAvailable() const
{
Q_D(const QProcess);
const QRingBuffer *readBuffer = (d->processChannel == QProcess::StandardError)
? &d->errorReadBuffer
: &d->outputReadBuffer;
#if defined QPROCESS_DEBUG
qDebug("QProcess::bytesAvailable() == %i (%s)", readBuffer->size(),
(d->processChannel == QProcess::StandardError) ? "stderr" : "stdout");
#endif
return readBuffer->size() + QIODevice::bytesAvailable();
}
/*! \reimp
*/
qint64 QProcess::bytesToWrite() const
{
Q_D(const QProcess);
qint64 size = d->writeBuffer.size();
#ifdef Q_OS_WIN
size += d->pipeWriterBytesToWrite();
#endif
return size;
}
/*!
Returns the type of error that occurred last.
\sa state()
*/
QProcess::ProcessError QProcess::error() const
{
Q_D(const QProcess);
return d->processError;
}
/*!
Returns the current state of the process.
\sa stateChanged(), error()
*/
QProcess::ProcessState QProcess::state() const
{
Q_D(const QProcess);
return d->processState;
}
/*!
\deprecated
Sets the environment that QProcess will use when starting a process to the
\a environment specified which consists of a list of key=value pairs.
For example, the following code adds the \c{C:\\BIN} directory to the list of
executable paths (\c{PATHS}) on Windows:
\snippet doc/src/snippets/qprocess-environment/main.cpp 0
\note This function is less efficient than the setProcessEnvironment()
function.
\sa environment(), setProcessEnvironment(), systemEnvironment()
*/
void QProcess::setEnvironment(const QStringList &environment)
{
setProcessEnvironment(QProcessEnvironmentPrivate::fromList(environment));
}
/*!
\deprecated
Returns the environment that QProcess will use when starting a
process, or an empty QStringList if no environment has been set
using setEnvironment() or setEnvironmentHash(). If no environment
has been set, the environment of the calling process will be used.
\note The environment settings are ignored on Windows CE and Symbian,
as there is no concept of an environment.
\sa processEnvironment(), setEnvironment(), systemEnvironment()
*/
QStringList QProcess::environment() const
{
Q_D(const QProcess);
return d->environment.toStringList();
}
/*!
\since 4.6
Sets the environment that QProcess will use when starting a process to the
\a environment object.
For example, the following code adds the \c{C:\\BIN} directory to the list of
executable paths (\c{PATHS}) on Windows and sets \c{TMPDIR}:
\snippet doc/src/snippets/qprocess-environment/main.cpp 1
Note how, on Windows, environment variable names are case-insensitive.
\sa processEnvironment(), QProcessEnvironment::systemEnvironment(), setEnvironment()
*/
void QProcess::setProcessEnvironment(const QProcessEnvironment &environment)
{
Q_D(QProcess);
d->environment = environment;
}
/*!
\since 4.6
Returns the environment that QProcess will use when starting a
process, or an empty object if no environment has been set using
setEnvironment() or setProcessEnvironment(). If no environment has
been set, the environment of the calling process will be used.
\note The environment settings are ignored on Windows CE,
as there is no concept of an environment.
\sa setProcessEnvironment(), setEnvironment(), QProcessEnvironment::isEmpty()
*/
QProcessEnvironment QProcess::processEnvironment() const
{
Q_D(const QProcess);
return d->environment;
}
/*!
Blocks until the process has started and the started() signal has
been emitted, or until \a msecs milliseconds have passed.
Returns true if the process was started successfully; otherwise
returns false (if the operation timed out or if an error
occurred).
This function can operate without an event loop. It is
useful when writing non-GUI applications and when performing
I/O operations in a non-GUI thread.
\warning Calling this function from the main (GUI) thread
might cause your user interface to freeze.
If msecs is -1, this function will not time out.
\sa started(), waitForReadyRead(), waitForBytesWritten(), waitForFinished()
*/
bool QProcess::waitForStarted(int msecs)
{
Q_D(QProcess);
if (d->processState == QProcess::Starting) {
if (!d->waitForStarted(msecs))
return false;
setProcessState(QProcess::Running);
emit started();
}
return d->processState == QProcess::Running;
}
/*! \reimp
*/
bool QProcess::waitForReadyRead(int msecs)
{
Q_D(QProcess);
if (d->processState == QProcess::NotRunning)
return false;
if (d->processChannel == QProcess::StandardOutput && d->stdoutChannel.closed)
return false;
if (d->processChannel == QProcess::StandardError && d->stderrChannel.closed)
return false;
return d->waitForReadyRead(msecs);
}
/*! \reimp
*/
bool QProcess::waitForBytesWritten(int msecs)
{
Q_D(QProcess);
if (d->processState == QProcess::NotRunning)
return false;
if (d->processState == QProcess::Starting) {
QTime stopWatch;
stopWatch.start();
bool started = waitForStarted(msecs);
if (!started)
return false;
if (msecs != -1)
msecs -= stopWatch.elapsed();
}
return d->waitForBytesWritten(msecs);
}
/*!
Blocks until the process has finished and the finished() signal
has been emitted, or until \a msecs milliseconds have passed.
Returns true if the process finished; otherwise returns false (if
the operation timed out, if an error occurred, or if this QProcess
is already finished).
This function can operate without an event loop. It is
useful when writing non-GUI applications and when performing
I/O operations in a non-GUI thread.
\warning Calling this function from the main (GUI) thread
might cause your user interface to freeze.
If msecs is -1, this function will not time out.
\sa finished(), waitForStarted(), waitForReadyRead(), waitForBytesWritten()
*/
bool QProcess::waitForFinished(int msecs)
{
Q_D(QProcess);
if (d->processState == QProcess::NotRunning)
return false;
if (d->processState == QProcess::Starting) {
QTime stopWatch;
stopWatch.start();
bool started = waitForStarted(msecs);
if (!started)
return false;
if (msecs != -1)
msecs -= stopWatch.elapsed();
}
return d->waitForFinished(msecs);
}
/*!
Sets the current state of the QProcess to the \a state specified.
\sa state()
*/
void QProcess::setProcessState(ProcessState state)
{
Q_D(QProcess);
if (d->processState == state)
return;
d->processState = state;
emit stateChanged(state);
}
/*!
This function is called in the child process context just before the
program is executed on Unix or Mac OS X (i.e., after \e fork(), but before
\e execve()). Reimplement this function to do last minute initialization
of the child process. Example:
\snippet doc/src/snippets/code/src_corelib_io_qprocess.cpp 4
You cannot exit the process (by calling exit(), for instance) from
this function. If you need to stop the program before it starts
execution, your workaround is to emit finished() and then call
exit().
\warning This function is called by QProcess on Unix and Mac OS X
only. On Windows, it is not called.
*/
void QProcess::setupChildProcess()
{
}
/*! \reimp
*/
qint64 QProcess::readData(char *data, qint64 maxlen)
{
Q_D(QProcess);
QRingBuffer *readBuffer = (d->processChannel == QProcess::StandardError)
? &d->errorReadBuffer
: &d->outputReadBuffer;
if (maxlen == 1 && !readBuffer->isEmpty()) {
int c = readBuffer->getChar();
if (c == -1) {
#if defined QPROCESS_DEBUG
qDebug("QProcess::readData(%p \"%s\", %d) == -1",
data, qt_prettyDebug(data, 1, maxlen).constData(), 1);
#endif
return -1;
}
*data = (char) c;
#if defined QPROCESS_DEBUG
qDebug("QProcess::readData(%p \"%s\", %d) == 1",
data, qt_prettyDebug(data, 1, maxlen).constData(), 1);
#endif
return 1;
}
qint64 bytesToRead = qint64(qMin(readBuffer->size(), (int)maxlen));
qint64 readSoFar = 0;
while (readSoFar < bytesToRead) {
const char *ptr = readBuffer->readPointer();
int bytesToReadFromThisBlock = qMin<qint64>(bytesToRead - readSoFar,
readBuffer->nextDataBlockSize());
memcpy(data + readSoFar, ptr, bytesToReadFromThisBlock);
readSoFar += bytesToReadFromThisBlock;
readBuffer->free(bytesToReadFromThisBlock);
}
#if defined QPROCESS_DEBUG
qDebug("QProcess::readData(%p \"%s\", %lld) == %lld",
data, qt_prettyDebug(data, readSoFar, 16).constData(), maxlen, readSoFar);
#endif
if (!readSoFar && d->processState == QProcess::NotRunning)
return -1; // EOF
return readSoFar;
}
/*! \reimp
*/
qint64 QProcess::writeData(const char *data, qint64 len)
{
Q_D(QProcess);
#if defined(Q_OS_WINCE)
Q_UNUSED(data);
Q_UNUSED(len);
d->processError = QProcess::WriteError;
setErrorString(tr("Error writing to process"));
emit error(d->processError);
return -1;
#endif
if (d->stdinChannel.closed) {
#if defined QPROCESS_DEBUG
qDebug("QProcess::writeData(%p \"%s\", %lld) == 0 (write channel closing)",
data, qt_prettyDebug(data, len, 16).constData(), len);
#endif
return 0;
}
if (len == 1) {
d->writeBuffer.putChar(*data);
if (d->stdinChannel.notifier)
d->stdinChannel.notifier->setEnabled(true);
#if defined QPROCESS_DEBUG
qDebug("QProcess::writeData(%p \"%s\", %lld) == 1 (written to buffer)",
data, qt_prettyDebug(data, len, 16).constData(), len);
#endif
return 1;
}
char *dest = d->writeBuffer.reserve(len);
memcpy(dest, data, len);
if (d->stdinChannel.notifier)
d->stdinChannel.notifier->setEnabled(true);
#if defined QPROCESS_DEBUG
qDebug("QProcess::writeData(%p \"%s\", %lld) == %lld (written to buffer)",
data, qt_prettyDebug(data, len, 16).constData(), len, len);
#endif
return len;
}
/*!
Regardless of the current read channel, this function returns all
data available from the standard output of the process as a
QByteArray.
\sa readyReadStandardOutput(), readAllStandardError(), readChannel(), setReadChannel()
*/
QByteArray QProcess::readAllStandardOutput()
{
ProcessChannel tmp = readChannel();
setReadChannel(StandardOutput);
QByteArray data = readAll();
setReadChannel(tmp);
return data;
}
/*!
Regardless of the current read channel, this function returns all
data available from the standard error of the process as a
QByteArray.
\sa readyReadStandardError(), readAllStandardOutput(), readChannel(), setReadChannel()
*/
QByteArray QProcess::readAllStandardError()
{
ProcessChannel tmp = readChannel();
setReadChannel(StandardError);
QByteArray data = readAll();
setReadChannel(tmp);
return data;
}
/*!
Starts the program \a program in a new process, if one is not already
running, passing the command line arguments in \a arguments. The OpenMode
is set to \a mode.
The QProcess object will immediately enter the Starting state. If the
process starts successfully, QProcess will emit started(); otherwise,
error() will be emitted. If the QProcess object is already running a
process, a warning may be printed at the console, and the existing
process will continue running.
\note Arguments that contain spaces are not passed to the
process as separate arguments.
\note Processes are started asynchronously, which means the started()
and error() signals may be delayed. Call waitForStarted() to make
sure the process has started (or has failed to start) and those signals
have been emitted.
\bold{Windows:} Arguments that contain spaces are wrapped in quotes.
\sa pid(), started(), waitForStarted()
*/
void QProcess::start(const QString &program, const QStringList &arguments, OpenMode mode)
{
Q_D(QProcess);
if (d->processState != NotRunning) {
qWarning("QProcess::start: Process is already running");
return;
}
#if defined QPROCESS_DEBUG
qDebug() << "QProcess::start(" << program << ',' << arguments << ',' << mode << ')';
#endif
d->outputReadBuffer.clear();
d->errorReadBuffer.clear();
if (d->stdinChannel.type != QProcessPrivate::Channel::Normal)
mode &= ~WriteOnly; // not open for writing
if (d->stdoutChannel.type != QProcessPrivate::Channel::Normal &&
(d->stderrChannel.type != QProcessPrivate::Channel::Normal ||
d->processChannelMode == MergedChannels))
mode &= ~ReadOnly; // not open for reading
if (mode == 0)
mode = Unbuffered;
QIODevice::open(mode);
d->stdinChannel.closed = false;
d->stdoutChannel.closed = false;
d->stderrChannel.closed = false;
d->program = program;
d->arguments = arguments;
d->exitCode = 0;
d->exitStatus = NormalExit;
d->processError = QProcess::UnknownError;
d->errorString.clear();
d->startProcess();
}
static QStringList parseCombinedArgString(const QString &program)
{
QStringList args;
QString tmp;
int quoteCount = 0;
bool inQuote = false;
// handle quoting. tokens can be surrounded by double quotes
// "hello world". three consecutive double quotes represent
// the quote character itself.
for (int i = 0; i < program.size(); ++i) {
if (program.at(i) == QLatin1Char('"')) {
++quoteCount;
if (quoteCount == 3) {
// third consecutive quote
quoteCount = 0;
tmp += program.at(i);
}
continue;
}
if (quoteCount) {
if (quoteCount == 1)
inQuote = !inQuote;
quoteCount = 0;
}
if (!inQuote && program.at(i).isSpace()) {
if (!tmp.isEmpty()) {
args += tmp;
tmp.clear();
}
} else {
tmp += program.at(i);
}
}
if (!tmp.isEmpty())
args += tmp;
return args;
}
/*!
\overload
Starts the program \a program in a new process, if one is not already
running. \a program is a single string of text containing both the
program name and its arguments. The arguments are separated by one or
more spaces. For example:
\snippet doc/src/snippets/code/src_corelib_io_qprocess.cpp 5
The \a program string can also contain quotes, to ensure that arguments
containing spaces are correctly supplied to the new process. For example:
\snippet doc/src/snippets/code/src_corelib_io_qprocess.cpp 6
If the QProcess object is already running a process, a warning may be
printed at the console, and the existing process will continue running.
Note that, on Windows, quotes need to be both escaped and quoted.
For example, the above code would be specified in the following
way to ensure that \c{"My Documents"} is used as the argument to
the \c dir executable:
\snippet doc/src/snippets/code/src_corelib_io_qprocess.cpp 7
The OpenMode is set to \a mode.
*/
void QProcess::start(const QString &program, OpenMode mode)
{
QStringList args = parseCombinedArgString(program);
if (args.isEmpty()) {
Q_D(QProcess);
d->processError = QProcess::FailedToStart;
setErrorString(tr("No program defined"));
emit error(d->processError);
return;
}
QString prog = args.first();
args.removeFirst();
start(prog, args, mode);
}
/*!
Attempts to terminate the process.
The process may not exit as a result of calling this function (it is given
the chance to prompt the user for any unsaved files, etc).
On Windows, terminate() posts a WM_CLOSE message to all toplevel windows
of the process and then to the main thread of the process itself. On Unix
and Mac OS X the SIGTERM signal is sent.
Console applications on Windows that do not run an event loop, or whose
event loop does not handle the WM_CLOSE message, can only be terminated by
calling kill().
On Symbian, this function requires platform security capability
\c PowerMgmt. If absent, the process will panic with KERN-EXEC 46.
\note Terminating running processes from other processes will typically
cause a panic in Symbian due to platform security.
\sa \l {Symbian Platform Security Requirements}
\sa kill()
*/
void QProcess::terminate()
{
Q_D(QProcess);
d->terminateProcess();
}
/*!
Kills the current process, causing it to exit immediately.
On Windows, kill() uses TerminateProcess, and on Unix and Mac OS X, the
SIGKILL signal is sent to the process.
On Symbian, this function requires platform security capability
\c PowerMgmt. If absent, the process will panic with KERN-EXEC 46.
\sa \l {Symbian Platform Security Requirements}
\sa terminate()
*/
void QProcess::kill()
{
Q_D(QProcess);
d->killProcess();
}
/*!
Returns the exit code of the last process that finished.
*/
int QProcess::exitCode() const
{
Q_D(const QProcess);
return d->exitCode;
}
/*!
\since 4.1
Returns the exit status of the last process that finished.
On Windows, if the process was terminated with TerminateProcess()
from another application this function will still return NormalExit
unless the exit code is less than 0.
*/
QProcess::ExitStatus QProcess::exitStatus() const
{
Q_D(const QProcess);
return d->exitStatus;
}
/*!
Starts the program \a program with the arguments \a arguments in a
new process, waits for it to finish, and then returns the exit
code of the process. Any data the new process writes to the
console is forwarded to the calling process.
The environment and working directory are inherited by the calling
process.
On Windows, arguments that contain spaces are wrapped in quotes.
*/
int QProcess::execute(const QString &program, const QStringList &arguments)
{
QProcess process;
process.setReadChannelMode(ForwardedChannels);
process.start(program, arguments);
process.waitForFinished(-1);
return process.exitCode();
}
/*!
\overload
Starts the program \a program in a new process. \a program is a
single string of text containing both the program name and its
arguments. The arguments are separated by one or more spaces.
*/
int QProcess::execute(const QString &program)
{
QProcess process;
process.setReadChannelMode(ForwardedChannels);
process.start(program);
process.waitForFinished(-1);
return process.exitCode();
}
/*!
Starts the program \a program with the arguments \a arguments in a
new process, and detaches from it. Returns true on success;
otherwise returns false. If the calling process exits, the
detached process will continue to live.
Note that arguments that contain spaces are not passed to the
process as separate arguments.
\bold{Unix:} The started process will run in its own session and act
like a daemon.
\bold{Windows:} Arguments that contain spaces are wrapped in quotes.
The started process will run as a regular standalone process.
The process will be started in the directory \a workingDirectory.
If the function is successful then *\a pid is set to the process
identifier of the started process.
*/
bool QProcess::startDetached(const QString &program,
const QStringList &arguments,
const QString &workingDirectory,
qint64 *pid)
{
return QProcessPrivate::startDetached(program,
arguments,
workingDirectory,
pid);
}
/*!
Starts the program \a program with the given \a arguments in a
new process, and detaches from it. Returns true on success;
otherwise returns false. If the calling process exits, the
detached process will continue to live.
\note Arguments that contain spaces are not passed to the
process as separate arguments.
\bold{Unix:} The started process will run in its own session and act
like a daemon.
\bold{Windows:} Arguments that contain spaces are wrapped in quotes.
The started process will run as a regular standalone process.
*/
bool QProcess::startDetached(const QString &program,
const QStringList &arguments)
{
return QProcessPrivate::startDetached(program, arguments);
}
/*!
\overload
Starts the program \a program in a new process. \a program is a
single string of text containing both the program name and its
arguments. The arguments are separated by one or more spaces.
The \a program string can also contain quotes, to ensure that arguments
containing spaces are correctly supplied to the new process.
*/
bool QProcess::startDetached(const QString &program)
{
QStringList args = parseCombinedArgString(program);
if (args.isEmpty())
return false;
QString prog = args.first();
args.removeFirst();
return QProcessPrivate::startDetached(prog, args);
}
QT_BEGIN_INCLUDE_NAMESPACE
#ifdef Q_OS_MAC
# include <crt_externs.h>
# define environ (*_NSGetEnviron())
#elif defined(Q_OS_WINCE) || defined(Q_OS_SYMBIAN)
static char *qt_empty_environ[] = { 0 };
#define environ qt_empty_environ
#elif !defined(Q_OS_WIN)
extern char **environ;
#endif
QT_END_INCLUDE_NAMESPACE
/*!
\since 4.1
Returns the environment of the calling process as a list of
key=value pairs. Example:
\snippet doc/src/snippets/code/src_corelib_io_qprocess.cpp 8
This function does not cache the system environment. Therefore, it's
possible to obtain an updated version of the environment if low-level C
library functions like \tt setenv ot \tt putenv have been called.
However, note that repeated calls to this function will recreate the
list of environment variables, which is a non-trivial operation.
\note For new code, it is recommended to use QProcessEvironment::systemEnvironment()
\sa QProcessEnvironment::systemEnvironment(), environment(), setEnvironment()
*/
QStringList QProcess::systemEnvironment()
{
QStringList tmp;
char *entry = 0;
int count = 0;
while ((entry = environ[count++]))
tmp << QString::fromLocal8Bit(entry);
return tmp;
}
/*!
\since 4.6
\brief The systemEnvironment function returns the environment of
the calling process.
It is returned as a QProcessEnvironment. This function does not
cache the system environment. Therefore, it's possible to obtain
an updated version of the environment if low-level C library
functions like \tt setenv ot \tt putenv have been called.
However, note that repeated calls to this function will recreate the
QProcessEnvironment object, which is a non-trivial operation.
\sa QProcess::systemEnvironment()
*/
QProcessEnvironment QProcessEnvironment::systemEnvironment()
{
QProcessEnvironment env;
const char *entry;
for (int count = 0; (entry = environ[count]); ++count) {
const char *equal = strchr(entry, '=');
if (!equal)
continue;
QByteArray name(entry, equal - entry);
QByteArray value(equal + 1);
env.insert(QString::fromLocal8Bit(name), QString::fromLocal8Bit(value));
}
return env;
}
/*!
\typedef Q_PID
\relates QProcess
Typedef for the identifiers used to represent processes on the underlying
platform. On Unix and Symbian, this corresponds to \l qint64; on Windows, it
corresponds to \c{_PROCESS_INFORMATION*}.
\sa QProcess::pid()
*/
QT_END_NAMESPACE
#include "moc_qprocess.cpp"
#endif // QT_NO_PROCESS