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Date: Sat, 11 Feb 2012 03:30:15 GMT
Message-Id: <201202110330.q1B3UF1V033278@freefall.freebsd.org>
To: freebsd-bugs@FreeBSD.org
From: David Xu <listlog2011@gmail.com>
Cc: 
Subject: Re: bin/164947: tee looses data when writing to non-blocking file
 descriptors
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The following reply was made to PR bin/164947; it has been noted by GNATS.

From: David Xu <listlog2011@gmail.com>
To: Diomidis Spinellis <dds@aueb.gr>
Cc: freebsd-gnats-submit@FreeBSD.org
Subject: Re: bin/164947: tee looses data when writing to non-blocking file
 descriptors
Date: Sat, 11 Feb 2012 11:21:38 +0800

 On 2012/2/10 15:04, Diomidis Spinellis wrote:
 >> Number:         164947
 >> Category:       bin
 >> Synopsis:       tee looses data when writing to non-blocking file descriptors
 >> Confidential:   no
 >> Severity:       serious
 >> Priority:       medium
 >> Responsible:    freebsd-bugs
 >> State:          open
 >> Quarter:
 >> Keywords:
 >> Date-Required:
 >> Class:          sw-bug
 >> Submitter-Id:   current-users
 >> Arrival-Date:   Fri Feb 10 07:10:09 UTC 2012
 >> Closed-Date:
 >> Last-Modified:
 >> Originator:     Diomidis Spinellis
 >> Release:        8.1
 >> Organization:
 > AUEB
 >> Environment:
 > FreeBSD istlab.dmst.aueb.gr 8.1-RELEASE-p6 FreeBSD 8.1-RELEASE-p6 #0: Tue Nov  1 15:16:34 EET 2011     dds@istlab.dmst.aueb.gr:/usr/obj/usr/src/sys/ISTLAB  i386
 > You have new mail in /var/mail/dds
 >
 >> Description:
 > When tee(1) tries to write to a file descriptor that has been set to non-blocking mode the write(2) call may fail with EAGAIN.  Instead of retrying the operation, tee will throw that chunk of data away.
 so tee should also work with non-blocking read,  your patch is incomplete.