[Wayland-bugs] [Bug 761095] wayland: use shm_open instead of open in tmpdir

[gtk+ (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=761095

--- Comment #4 from Ray Strode [halfline] <rstrode at redhat.com> ---
Created attachment 319697
  --> https://bugzilla.gnome.org/attachment.cgi?id=319697&action=edit
wayland: use memfd_create instead of open in tmpdir

The tmpdir is used for a wide assortment of things, and
can easily fill up. If it fills then desktop will start
crashing with SIGBUS errors.

This commit changes the shm pool allocation code, to use
memfd_create, instead, so the shared memory files will
be anonymous and not associated with /tmp

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