linux-kernel - Re: [PATCH RFC 5/6] epoll: Add implementation for epoll_mod

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Date:	Wed, 21 Jan 2015 11:34:38 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>,
	Fam Zheng <famz@...hat.com>
CC:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kees Cook <keescook@...omium.org>,
	Andy Lutomirski <luto@...capital.net>,
	David Herrmann <dh.herrmann@...il.com>,
	Alexei Starovoitov <ast@...mgrid.com>,
	Miklos Szeredi <mszeredi@...e.cz>,
	David Drysdale <drysdale@...gle.com>,
	Oleg Nesterov <oleg@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Vivek Goyal <vgoyal@...hat.com>,
	Mike Frysinger <vapier@...too.org>,
	"Theodore Ts'o" <tytso@....edu>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Rashika Kheria <rashika.kheria@...il.com>,
	Hugh Dickins <hughd@...gle.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-fsdevel@...r.kernel.org, linux-api@...r.kernel.org,
	Josh Triplett <josh@...htriplett.org>
Subject: Re: [PATCH RFC 5/6] epoll: Add implementation for epoll_mod_wait



On 21/01/2015 08:52, Michael Kerrisk (man-pages) wrote:
>> > The problem is that there is no room for flags field in epoll_pwait1, which is
>> > asked for, in previous discussion thread [1].
> Ahh yes, I certainly should not have forgotten that. But that's easily solved.
> Do as for pselect6():
> 
> strcut sigargs {
>     const sigset_t *ss;
>     size_t          ss_len; /* Size (in bytes) of object pointed
>                                to by 'ss' */
> }
> 
> epoll_pwait1(int epfd, struct epoll_event *events, int maxevents, 
>              struct timespec *timeout, int clock_id, int flags,
>              int timeout,
>              const struct sigargs *sargs);
> 

Alternatively, place the clock_id in the lower 16 bits of flags.
MAX_CLOCKS is 16 right now, so there's room.

Paolo
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