Has a filehandle been binmode'd

[fireartist]

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.

[borisz]

See PerlIO and then the get_layers function.

my @l = PerlIO::get_layers($fh, details => 1);

[ambrus]

Hmm. I knew this too but you were faster.

[derby]

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"
}