It was not possible to get the actual process ID (in a cross-platform
manner) from QProcess, as the user would need to handle the returned
typedef (Q_PID) differently on Unix and Windows.
On Unix Q_PID is the actual process ID, but on Windows it's a pointer
to a PROCESS_INFORMATION structure, which among other fields contains
the process ID. Instead of returning a pointer on Windows,
QProcess::processId() will return the actual process ID on both Windows
and Unix.
[ChangeLog][QtCore][QProcess] Added processId() to QProcess. This
function will, unlike pid(), return the actual process identifier on
both Window and Unix.
Task-number: QTBUG-26136
Change-Id: I853ab721297e2dd9cda006666144179a9e25b73d
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>