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Has a filehandle been binmode'd

by fireartist (Chaplain)
on Feb 27, 2006 at 11:52 UTC ( #532999=perlquestion: print w/ replies, xml ) Need Help??
fireartist has asked for the wisdom of the Perl Monks concerning the following question:

Is there a way to check whether binmode() has been called on a filehandle?

If not, I notice in the perl source file PerlIO/via/via.xs that there's a method PerlIO_modestr which might help, but I lack the tuits to look into this further. Any pointers appreciated.

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Re: Has a filehandle been binmode'd
by derby (Monsignor) on Feb 27, 2006 at 13:53 UTC

    Hmmm ... well you could try Fcntl; however, it may not be supported on your platform:

    !#/usr/bin/perl

use Fcntl;

open( FH, "<", "/bin/cat" )     or die "cannot open file: $!\n";
$flags = fcntl(FH, F_GETFL, 0) or die "Can't get flags for the file: $
+!\n";

if( $flags | O_BINARY ) {
   print "OPEN FOR BINARY\n"
}

    [download]
    -derby
[reply]
[d/l]
Re: Has a filehandle been binmode'd
by borisz (Canon) on Feb 27, 2006 at 14:04 UTC
    See PerlIO and then the get_layers function. 
    my @l = PerlIO::get_layers($fh, details => 1);

    [download]
    Boris
[reply]
[d/l]
[reply]

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