Date: Sun, 7 Jan 1996 23:31:27 -0500 (EST) From: Chuck Robey <chuckr@glue.umd.edu> To: FreeBSD-chat@FreeBSD.org Subject: cpp construction Message-ID: <Pine.SUN.3.91.960107232459.7194E-100000@cappuccino.eng.umd.edu>
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There's a construction that's used (I think) to supply prototypes that
I've never really understood, and I was wondering if anyone might be
feeling like a short lecture here. The example is from
/usr/src/sys/miscfs/nullfs/null_subr.c, which I happen to be studying
right now, but I've seen this construction a lot of times before (but
with no more comprehension). Anyways, here's the example:
static int null_node_alloc __P((struct mount *mp, struct vnode *lowervp,
struct vnode **vpp));
It's that __P thing, with the double parens, that has me wondering. I'd
really appreciate some help.
I didn't put this in questions because it's so wildly different from the
kind of stuff normally seen there, and I didn't put it in hackers because
it has nothing to do with anything going on, it's just me studying the
system. If someone wants to transplant this to another list, fine with
me, but it seemed a good compromise here in -chat.
============================================================================
Chuck Robey chuckr@eng.umd.edu -- I run FreeBSD on n3lxx and Journey2
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