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Date: Thu, 4 Nov 2004 12:28:33 -0500 (EST)
From: Igor Pechtchanski <pechtcha AT cs DOT nyu DOT edu>
Reply-To: cygwin AT cygwin DOT com
To: cygwin AT cygwin DOT com
Subject: Re: Perl binmode problem on text mount
In-Reply-To: <20041104163029.GC11533@trixie.casa.cgf.cx>
Message-ID: <Pine.GSO.4.61.0411041217450.25828@slinky.cs.nyu.edu>
References: <41897FF4 DOT 1080501 AT agilent DOT com> <Pine DOT GSO DOT 4 DOT 61 DOT 0411032211380 DOT 687 AT slinky DOT cs DOT nyu DOT edu> <4189BC6E DOT 8060009 AT agilent DOT com> <20041104163029 DOT GC11533 AT trixie DOT casa DOT cgf DOT cx>
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On Thu, 4 Nov 2004, Christopher Faylor wrote:

> On Wed, Nov 03, 2004 at 09:21:50PM -0800, Earl Chew wrote:
> >Igor Pechtchanski wrote:
> >>On Wed, 3 Nov 2004, Earl Chew wrote:
> >>
> >>>This code used to work on Perl 5.6.1-2 on Cygwin 1.3.10.
> >>>
> >>>I've now moved to Perl 5.8.5-3 on Cygwin 1.5.11.
> >>>
> >>>Here is the Perl program:
> >>>
> >>>	binmode STDOUT;
> >>>	print "Hello\n";
> >>>
> >>>1. Output to file on text mount
> >>>
> >>>	perl foo.pl > foo.txt ; od -c foo.txt
> >>>
> >>>	0000000  H e l l o \r \n	# Perl 5.8.5-3 Cygwin 1.5.11
> >>>	0000000  H e l l o \n		# Perl 5.6.1-2 Cygwin 1.3.10
> >[ .. snip .. ]
> >>This is expected behavior.  Unless you use raw writes (as "cat" does), the
> >>mode of the file (text or binary) is determined *by the program that opens
> >>the file*.  In the above case, the program is not perl, it's your shell.
> >
> >I think you're telling me that "binmode STDOUT" has no effect. I find
> >this counterintuitive.
> >
> >Without "binmode STDOUT", I can see how your explanation would work.
>
> AFAIK, binmode STDOUT should work fine.  It should eventually translate
> to the setmode call.

Do you mean the "set_flags" call?

> Since setmode takes an fd argument it obviously should affect the mode
> of the file being read or written regardless of how it was originally
> opened.
>
> cgf

I used the command-line version of the above script:

strace -o bmode.strace perl -e 'binmode STDOUT;print "Hello\n"' > foo.txt

bmode.strace was only ~350 lines, and it seems to show that the mode of fd
1 is set to text based on the mount info, and never reset to binary
afterwards.  fhandler_base::write reports a text write.  So it does look
like "binmode STDOUT" doesn't work...  What am I missing?
	Igor
-- 
				http://cs.nyu.edu/~pechtcha/
      |\      _,,,---,,_		pechtcha AT cs DOT nyu DOT edu
ZZZzz /,`.-'`'    -.  ;-;;,_		igor AT watson DOT ibm DOT com
     |,4-  ) )-,_. ,\ (  `'-'		Igor Pechtchanski, Ph.D.
    '---''(_/--'  `-'\_) fL	a.k.a JaguaR-R-R-r-r-r-.-.-.  Meow!

"The Sun will pass between the Earth and the Moon tonight for a total
Lunar eclipse..." -- WCBS Radio Newsbrief, Oct 27 2004, 12:01 pm EDT

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