Re: [hackers] [dwm][PATCH] grabkeys: Avoid missing events when a keysym maps to multiple keycodes

From: Chris Down <>
Date: Wed, 7 Dec 2022 14:44:19 +0000

Hiltjo Posthuma writes:
>Thanks for the patch, I will probably look at it further this weekend.

Thanks for looking! :-)

>Should syms be checked before XFree(syms) or can the return value not be NULL?

I was going to say that it's not possible even with a race with a new mapping,
since XDisplayKeycodes() just tells us what the min/max possible keycodes are
for this display, regardless of future changes in the mapping. However, looking
at the source, I also see that we do actually return NULL for another reason
not documented in the man page: if the internal Xmallocarray() fails. I'll add
the guard and send v2. Thanks!
Received on Wed Dec 07 2022 - 15:44:19 CET

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