QWaylandShmBuffer: use QTemporaryFile

Instead of using mkstemp. Even current glibc versions do not open the
file with O_CLOEXEC, so this code is not thread-safe. QTemporaryFile is.
And since Qt 5.10, it will also use O_TMPFILE on Linux, so the file will
not actually exists on disk.

Take this opportunity to use the runtime directory instead of /tmp.
There's no guarantee that the /tmp filesystem can support mmap'ing,
while XDG_RUNTIME_DIR has that guarantee. It's also usually a tmpfs, so
no data will be leaked to disk.

Change-Id: I8d96dea9955d4c749b99fffd14cd5335d1114cef
Reviewed-by: Giulio Camuffo <giulio.camuffo@kdab.com>

0 files changed, 0 insertions, 0 deletions