Re: Type of udata in kevent

To: D'Arcy J.M. Cain <darcy%druid.net@localhost>
Subject: Re: Type of udata in kevent
From: Matt Thomas <matt%3am-software.com@localhost>
Date: Sat, 10 Nov 2012 08:17:45 -0800

On Nov 10, 2012, at 7:40 AM, D'Arcy J.M. Cain wrote:

> In /usr/include/sys/event.h we define udata in the kevent structure as
> intptr_t.  FreeBSD defines it as a void *.  This is a problem with
> portability.  The comment describes udata as "opaque user data
> identifier" suggesting that FreeBSD is correct.  Does anyone know why
> we call it a pointer to an int?

No, we define it as an integer type which is the same size as a void *.

References:
- Type of udata in kevent
  - From: D'Arcy J.M. Cain

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