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Re: one byte reads in bash

Hi... 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:
> 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!!!)

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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