linux-kernel - Re: [PATCH RFC v2 0/7] epoll: Introduce new syscalls, epoll_ctl_batch and epoll

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20150205015151.GA27112@ad.nay.redhat.com>
Date:	Thu, 5 Feb 2015 09:51:51 +0800
From:	Fam Zheng <famz@...hat.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, X86 ML <x86@...nel.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kees Cook <keescook@...omium.org>,
	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 FS Devel <linux-fsdevel@...r.kernel.org>,
	Linux API <linux-api@...r.kernel.org>,
	Josh Triplett <josh@...htriplett.org>,
	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Omar Sandoval <osandov@...ndov.com>
Subject: Re: [PATCH RFC v2 0/7] epoll: Introduce new syscalls,
 epoll_ctl_batch and epoll_pwait1

On Wed, 02/04 13:38, Andy Lutomirski wrote:
> On Wed, Feb 4, 2015 at 2:36 AM, Fam Zheng <famz@...hat.com> wrote:
> > 2) epoll_pwait1
> > ---------------
> >
> > NAME
> >        epoll_pwait1 - wait for an I/O event on an epoll file descriptor
> >
> > SYNOPSIS
> >
> >        #include <sys/epoll.h>
> >
> >        int epoll_pwait1(int epfd, int flags,
> >                         struct epoll_event *events,
> >                         int maxevents,
> >                         struct timespec *timeout,
> >                         struct sigargs *sig);
> >
> > DESCRIPTION
> >
> >        The epoll_pwait1 system call differs from epoll_pwait only in parameter
> >        types. The first difference is timeout, a pointer to timespec structure
> >        which allows nanosecond presicion; the second difference, which should
> >        probably be wrapper by glibc and only expose a sigset_t pointer as in
> >        pselect6.
> >
> >        If timeout is NULL, it's treated as if 0 is specified in epoll_pwait
> >        (return immediately). Otherwise it's converted to nanosecond scalar,
> >        again, with the same convention as epoll_pwait's timeout.
> 
> Is the timeout absolute or relative?

Relative. Will document it. We can add a first flag for absolute timeout later.

Thanks.

Fam
> 
> I'd kind of like the ability to set timeouts on multiple clocks at the
> same time, but I can live without that.

Please see my reply to Michael.

Fam
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/