Bug #9067: IO.reopen broken in 1.9/2.0, worked in 1.8

• Status: Rejected
• Assignee: -
• Target version: -
• ruby -v: ruby 2.0.0p247 (2013-06-27 revision 41674) [universal.x86_64-darwin13]
• Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN

[walles (Johan Walles)]

Try piping some input into the attached code:

echo foo | reopen-fail.rb

Works as expected with ruby 1.8.7 (2012-02-08 patchlevel 358) [i686-linux]:

• "foo" is printed at the middle of the screen
• you can press RETURN to exit

Results with ruby 1.9.3p194 (2012-04-20 revision 35410) [i686-linux] and ruby 2.0.0p247 (2013-06-27 revision 41674) [universal.x86_64-darwin13]:

./reopen-fail.rb:8:in reopen': <STDIN> can't change access mode from "r" to "w" (ArgumentError) from ./reopen-fail.rb:8:in '

AFAICT this makes it impossible to write Curses programs in Ruby that can accept input through pipes with newer versions of Ruby.

In my particular case this blocks my Ruby-implemented less replacement: https://github.com/walles/moar

[akr (Akira Tanaka)]

2013/10/31 walles (Johan Walles) [e-mail]:

Bug #9067: IO.reopen broken in 1.9/2.0, worked in 1.8
https://bugs.ruby-lang.org/issues/9067

./reopen-fail.rb:8:in reopen': <STDIN> can't change access mode from "r" to "w" (ArgumentError) from ./reopen-fail.rb:8:in '

AFAICT this makes it impossible to write Curses programs in Ruby that can accept input through pipes with newer versions of Ruby.

I recommend
$stdin.reopen(IO.new(1, "r+"))
or
$stdin.reopen("/dev/tty")
instead of
$stdin.reopen($stdout)

Tanaka Akira

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Rejected

[walles (Johan Walles)]

Thanks for the quick turnaround!

$stdin.reopen(IO.new(1, "r+")) does what I want.