STDOUT.tty? returns false when running from Cygwin using rxvt (or mintty, putty)
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Key: JRUBY-5068
URL: http://jira.codehaus.org/browse/JRUBY-5068
Project: JRuby
Issue Type: Bug
Affects Versions: JRuby 1.5.1
Environment: Cygwin 1.7
Windows Vista
Java 1.6
Reporter: Andrew Davey
Assignee: Thomas E Enebo
The following command will print false if you run it from cygwin using a
terminal.
jruby -e 'puts STDOUT.tty?'
If you run the above command from cygwin using the windows console, and/or the
Windows environment variable CYGWIN contains 'notty', then the tty? returns
true.
The way that cygwin emulates pty's (which are needed by terminal emulators like
rvxt and mintty etc) is to redirect stdin and stdout using pipes.
Calling STDOUT.tty? makes a call to 'isatty' in
org.jruby.ext.posix.WindowsPOSIX which calls the Win32 function GetFileType().
isatty wants GetFileType to return FILE_TYPE_CHAR, instead GetFileType sees
that STDOUT has been redirected to a pipe (to emulate a pty) and returns
FILE_TYPE_PIPE.
Forgive me if this is not technically a bug, since there are known issues with
running non cygwin console apps under cygwin + term.
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