# Isatty() and IO.tty?

**URL:** <https://www.ruby-forum.com/t/isatty-and-io-tty/126838>\
**Category:** Ruby\
**Created:** [January 22, 2008, 5:50pm UTC](https://www.ruby-forum.com/t/isatty-and-io-tty/126838 "2008-01-22T17:50:57Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![backz](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/9f8e36/32.png) [@backz](https://www.ruby-forum.com/u/backz)\
**Post date:** [January 22, 2008, 5:50pm UTC](https://www.ruby-forum.com/t/isatty-and-io-tty/126838/1 "2008-01-22T17:50:57Z")

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In Ruby or via a C extension, how do I call a C program so that  
isatty(stdout) returns true?  
I don’t want to route it through another shell.

Daniel Brumbaugh K.