linux-kernel - Re: [PATCHv5 4/5] Allow setting O

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Message-ID: <4747D610.6040108@redhat.com>
Date:	Fri, 23 Nov 2007 23:43:12 -0800
From:	Ulrich Drepper <drepper@...hat.com>
To:	Eric Dumazet <dada1@...mosbay.com>
CC:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	mingo@...e.hu, tglx@...utronix.de, torvalds@...ux-foundation.org
Subject: Re: [PATCHv5 4/5] Allow setting O_NONBLOCK flag for new sockets

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Eric Dumazet wrote:
> 1) Can the fd passing with recvmsg() on AF_UNIX also gets O_CLOEXEC
> support ?

Already there, see MSG_CMSG_CLOEXEC.


> 2) Why this O_NONBLOCK ability is needed for sockets ? Is it a security
> issue, and if yes could you remind it to me ?

No security issue.  But look at any correct network program, all need to
set the mode to non-blocking.  Adding this support to the syscall comes
at almost no cost and it cuts the cost for every program down by one or
two syscalls.

- --
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
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