diff options
Diffstat (limited to 'src/corelib/io/qprocess.cpp')
| -rw-r--r-- | src/corelib/io/qprocess.cpp | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/src/corelib/io/qprocess.cpp b/src/corelib/io/qprocess.cpp index 96cec568df..d473281acc 100644 --- a/src/corelib/io/qprocess.cpp +++ b/src/corelib/io/qprocess.cpp @@ -1317,6 +1317,10 @@ void QProcess::closeWriteChannel() object will be in read-only mode (calling write() will result in error). + To make the process read EOF right away, pass nullDevice() here. + This is cleaner than using closeWriteChannel() before writing any + data, because it can be set up prior to starting the process. + If the file \a fileName does not exist at the moment start() is called or is not readable, starting the process will fail. @@ -1340,6 +1344,10 @@ void QProcess::setStandardInputFile(const QString &fileName) read channel is closed: reading from it using read() will always fail, as will readAllStandardOutput(). + To discard all standard output from the process, pass nullDevice() + here. This is more efficient than simply never reading the standard + output, as no QProcess buffers are filled. + 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. @@ -2440,6 +2448,25 @@ QStringList QProcess::systemEnvironment() */ /*! + \since 5.2 + + \brief The null device of the operating system. + + The returned file path uses native directory separators. + + \sa QProcess::setStandardInputFile(), QProcess::setStandardOutputFile(), + QProcess::setStandardErrorFile() +*/ +QString QProcess::nullDevice() +{ +#ifdef Q_OS_WIN + return QStringLiteral("\\\\.\\NUL"); +#else + return QStringLiteral("/dev/null"); +#endif +} + +/*! \typedef Q_PID \relates QProcess |