bin/164947: tee looses data when writing to non-blocking file
descriptors
David Xu
listlog2011 at gmail.com
Sat Feb 11 03:30:15 UTC 2012
The following reply was made to PR bin/164947; it has been noted by GNATS.
From: David Xu <listlog2011 at gmail.com>
To: Diomidis Spinellis <dds at aueb.gr>
Cc: freebsd-gnats-submit at 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 at 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.
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