Enables QProcess back on QNX.

Because fork()/vfork() on QNX are not supported on multithreaded applications,
QProcess had been disabled on this platform. The corresponding code has now
been replaced with functions that wrap around spawn().

Change-Id: I46091b7d41f322a5cad07d17893aa929c84941ef
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>

1 files changed, 12 insertions, 1 deletions

diff --git a/src/corelib/io/qprocess.cpp b/src/corelib/io/qprocess.cpp
index 0a0097c887..1312e9b55f 100644
--- a/src/corelib/io/qprocess.cpp
+++ b/src/corelib/io/qprocess.cpp
@@ -520,6 +520,11 @@ void QProcessPrivate::Channel::clear()
     setWorkingDirectory(). By default, processes are run in the
     current working directory of the calling process.
 
+    \note On QNX, setting the working directory may cause all
+    application threads, with the exception of the QProcess caller
+    thread, to momentaneusly freeze, owing to a limitation in
+    the operating system.
+
     \section1 Synchronous Process API
 
     QProcess provides a set of functions which allow it to be used
@@ -1433,6 +1438,9 @@ QString QProcess::workingDirectory() const
     process in this directory. The default behavior is to start the
     process in the working directory of the calling process.
 
+    \note On QNX, this may cause all application threads to
+    momentaneusly freeze.
+
     \sa workingDirectory(), start()
 */
 void QProcess::setWorkingDirectory(const QString &dir)
@@ -1755,7 +1763,7 @@ void QProcess::setProcessState(ProcessState state)
     exit().
 
     \warning This function is called by QProcess on Unix and Mac OS X
-    only. On Windows, it is not called.
+    only. On Windows and QNX, it is not called.
 */
 void QProcess::setupChildProcess()
 {
@@ -2149,6 +2157,9 @@ int QProcess::execute(const QString &program)
 
     The process will be started in the directory \a workingDirectory.
 
+    \note On QNX, this may cause all application threads to
+    momentaneusly freeze.
+
     If the function is successful then *\a pid is set to the process
     identifier of the started process.
 */