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Message-ID:	<3EE98396.2090801@schwingel.com>
Date:	Fri, 13 Jun 2003 09:56:06 +0200
From:	Roland Schwingel <roland AT schwingel DOT com>
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To:	cygwin AT cygwin DOT com
Subject:	Re: one byte reads in bash

Hi...

cygwin-owner AT cygwin DOT com wrote on 12.06.2003 19:05:35:
 > Just so that the list thread gets the info, I had a private reply from Dan
 > Vasaru, who referred me to his patch to bash here:
 >
 > http://sources.redhat.com/ml/cygwin/2002-09/msg00446.html
 >
 > I applied his patch to the current cygwin bash source (plus the three
 > wide-character compilation fixes for bash on current cygwin mentioned
 > elsewhere in the list archives)  and the one-byte-read problem goes away.
 > (The patch turns off the bash cygwin-specific detection for a non-seekable
 > file handle and enables existing bash code to get the seeking-in-text-mode
 > stuff right).
 >
 > i.e. bash now reads script files in buffered chunks rather than
 > character-at-a-time. (note - I don't mean character-at-a-time buffered by
 > stdio, I mean char-at-a-time from the O/S).
 >
 > I originally noticed the problem with a network analyser, which also shows
 > the fix. For a 2.5Kbyte script, the patched bash does 2 reads (two network
 > reply/response data packets) versus the current cygwin bash which does
 > 2500 network read/reply packets. Note that cygwin strace suggests that the
 > problem also occurs for scripts on local disk, although it obviously has
 > less impact in that case.
 >
 > For my money, this is a great patch. I've not tested it for other ill
 > effects as yet, but the read issue is certainly resolved.

The one byte read problem is IMHO really a pain in a well known part of everyones body...

A former colleague of mine posted this obervation already here...
(Unfortunately with a bad subject - Sorry for this - it wasn't ment that way - Cygwin is great!!!)
http://sources.redhat.com/ml/cygwin/2001-07/msg01420.html

Is it possible to apply the fix mentioned above once to the "regular" cygwin bash, so
one does not always need to recompile bash on his own?

Thanks Roland



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