2 files changed, 20 insertions, 4 deletions
diff --git a/src/corelib/io/qprocess.cpp b/src/corelib/io/qprocess.cpp
index 63c2ab8..7725ca8 100644
--- a/src/corelib/io/qprocess.cpp
+++ b/src/corelib/io/qprocess.cpp
@@ -551,6 +551,16 @@ void QProcessPrivate::Channel::clear()
     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
 */
 
@@ -2006,9 +2016,13 @@ void QProcess::start(const QString &program, OpenMode mode)
     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()
@@ -2023,6 +2037,10 @@ void QProcess::terminate()
     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()
diff --git a/src/corelib/io/qwindowspipewriter.cpp b/src/corelib/io/qwindowspipewriter.cpp
index 417439f..2fe4424 100644
--- a/src/corelib/io/qwindowspipewriter.cpp
+++ b/src/corelib/io/qwindowspipewriter.cpp
@@ -128,11 +128,9 @@ void QWindowsPipeWriter::run()
         overl.OffsetHigh = 0;
         while ((!quitNow) && totalWritten < maxlen) {
             DWORD written = 0;
-            // Write 2k at a time to prevent flooding the pipe. If you
-            // write too much (4k-8k), the pipe can close
-            // unexpectedly.
             if (!WriteFile(writePipe, ptrData + totalWritten,
-                    qMin<int>(2048, maxlen - totalWritten), &written, &overl)) {
+                           maxlen - totalWritten, &written, &overl)) {
+
                 if (GetLastError() == 0xE8/*NT_STATUS_INVALID_USER_BUFFER*/) {
                     // give the os a rest
                     msleep(100);