This minimizes any multi-threading / file-locking issues as the file is
closed once the contents are read.
This change assumes /proc/self/mountinfo is available on Linux systems,
and doesn't fallback to setmntent(). It's been around since at least
Linux Kernel 2.4.0.
This requires exporting qstrntoll() for the unittests (using
QT_AUTOTEST_EXPORT and wrapping the those unittests in "#ifdef
QT_BUILD_INTERNAL"), otherwise linking fails.
Fixes: QTBUG-77059
Change-Id: I0363258a9979ea6dadfe5e36c02534ffbd3386c5
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>
543ae6e6a4