Re: kill_fasync usage

Manfred Spraul (
Tue, 04 Mar 2003 22:02:14 +0100

SA wrote:

>I wnat to use kill_fasync(struct fasync_struct *PTR,...) to notify userland of
>events. Can I just call kill_fasync regardless of the state of PTR or does
>PTR actually have to point to something valid.
kill_fasync receives the _address_ of the variable that contains the
list of processes that need notifications. It must not be NULL. (I
assume you look at 2.4 or 2.5 - 2.2 had a different interface)

Check linux/drivers/char/busmouse.c for an example, the interface is
simple: call fasync_helper to register and kill_fasync for the actual


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