Mail Archives: cygwin/2005/08/22/07:07:25
Igor Pechtchanski wrote:
> On Sun, 21 Aug 2005, Igor Pechtchanski wrote:
>
>
>>I'm trying to make sure our perl program works with text mounts. In the
>>course of the testing, one weird problem cropped up: binmode seems to
>>have no effect on STDOUT when redirecting to a file on a text mount.
>>
>>The following consistently reproduces the problem for me:
>>
>>$ mount -m | grep text
>>mount -f -u -t "c:/cygwin/tmp/text" "/tmp/text"
>>$ cd /tmp/text
>>$ /usr/bin/perl -e 'binmode(STDOUT);print "\n"' > PT
>>$ od -c PT
>>0000000 \r \n
>>0000002
>>$
>>
>>I've tried various combinations of ":raw", ":perlio", etc, both directly
>>and through the PERLIO variable, with no success. The strace output
>>(available upon request) seems to show that the handle is successfully
>>set to binary mode, but that the write still happens in text mode.
>>
>>Can anyone else reproduce this? Is there a way I can force binary mode
>>on STDOUT in Perl?
>
>
> On second thought, this probably has to do with *how* Perl sets binmode on
> STDOUT. The shells (I tried ash, bash, tcsh) don't seem to honor it.
>
> BTW, the code I used is the same as that in /usr/bin/GET.pl and
> /usr/bin/piconv (both break in the same way on redirection to files on
> text mounts).
>
> I know the shells can honor the O_BINARY specifier on STDOUT, since "cat"
> uses this (via setmode(1, O_BINARY)). There must be something that Perl
> is doing differently. Any ideas?
I believe that this was discussed before, evtually a bug report was
already filed. I think the problem is the redirection, here is the
shell involved. Please search the archives (and send me a link when
you have found it).
Gerrit
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