Type of udata in kevent

["D'Arcy J.M. Cain" <darcy%druid.net@localhost>]

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?

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