[PATCH] xfree86: always enable SIGIO on OsVendorInit (#50957)

[Keith Packard]

Peter Hutterer <peter.hutterer at who-t.net> writes:

> An alternative change would be to add this to os/osinit.c but iirc the
> xfree86 ddx is the only one that actually needs SIGIO, right?

Oh. Ick. OsBlockSignals and xf86BlockSIGIO both mess with
sigprocmask. Surely that can't be a good thing.

(Note that kdrive *also* has sigprocmask calls (not that we really
care about kdrive anymore).)

Seems like we should create an OsBlockSIGIO function and have it
cooperate with OsBlockSignals, then call that from both xf86 and kdrive.

-- 
keith.packard at intel.com
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