linux-kernel - Re: Regression - /proc/kmsg does not (always) block for 1-byte reads

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Message-ID: <alpine.LNX.2.01.1208101455420.23731@frira.zrqbmnf.qr>
Date:	Fri, 10 Aug 2012 14:56:54 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...i.de>
To:	Kay Sievers <kay@...y.org>
cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg Kroah-Hartman <greg@...ah.com>,
	Jukka Ollila <jiiksteri@...il.com>,
	linux-kernel@...r.kernel.org, jbeulich@...ell.com,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: Regression - /proc/kmsg does not (always) block for 1-byte
 reads


On Saturday 2012-07-07 23:19, Kay Sievers wrote:
>On Fri, Jul 6, 2012 at 10:30 PM, Linus Torvalds
><torvalds@...ux-foundation.org> wrote:
>> Kay, this needs to be fixed.
>>
>> Suggested fix: just use the 'seq_printf()' interfaces, which do the
>> proper buffering, and allow any size reads of various packetized data.
>
>I'll have a look.
>
>> Of course, I'd also suggest that whoever was the genius who thought it
>> was a good idea to read things ONE F*CKING BYTE AT A TIME with system
>> calls for each byte should be retroactively aborted. Who the f*ck does
>> idiotic things like that? How did they noty die as babies, considering
>> that they were likely too stupid to find a tit to suck on?
>
>Maybe the bs=1 in the dd call stands for bullshit. :)

It seems people need to be taught to use ddrescue, stringently.
Having to calculate appropriate values for bs= and count= when
you just want to transfer bytes is already a crime, not to mention
the problem when you have a prime number of bytes to transfer.
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