[Wayland-bugs] [Bug 766341] Do not rely on memfd as it requires a fairly recent kernel

[gtk+ (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=766341

--- Comment #12 from Simon McVittie <simon.mcvittie at collabora.co.uk> ---
(In reply to Ray Strode [halfline] from comment #11)
> we may have to check for EPERM in addition to ENOSYS.  see this, oddly
> coincidental, irc log from this morning

I'd be tempted to ignore errno and just assume that any memfd_create() failure
should result in fallback... is there any reason memfd_create() could fail
where trying shm_open() wouldn't be a valid fallback?

Looking at the memfd_create man page, EMFILE/ENFILE would fail in the same way
for shm_open(), ENOMEM would probably have the same result for shm_open() too,
and EINVAL can only happen if it's used wrong.

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