linux-kernel - Re: [PATCH 06/11] pps: serial clients support.

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Date:	Thu, 3 Dec 2009 12:24:58 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Rodolfo Giometti <giometti@...eenne.com>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Dave Jones <davej@...hat.com>, Sam Ravnborg <sam@...nborg.org>,
	Greg KH <greg@...ah.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Kay Sievers <kay.sievers@...y.org>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH 06/11] pps: serial clients support.

> > void n_tty_init_ops(struct tty_ldisc_ops *ops)
> > {
> > 	*ops = tty_ldisc_N_TTY;
> > 	ops->owner = NULL:
> > 	ops->refcount = ops->flags = 0;
> > }
> > EXPORT_SYMBOL_GPL(n_tty_inherit_ops);
> 
> The problem is that I have to do some operations into ldisc's open and
> close methods (see linux/drivers/pps/clients/pps-ldisc.c).
> 
> By using your solution I inherit such methods but I cannot modify
> their behaviour in a manner suitable for register/deregister PPS
> support at runtime.

You can

	n_tty_init_ops(&my_ops);
	my_ops.num = whatever;
	old_open = my_ops.open;
	my_ops.open = pps_ntty_open;

etc

While not as pretty in C as C++ it works fine.
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