Ruby in a Nutshell

Name

PTY — Pseudo TTY access module

Synopsis

The PTY module executes commands as if their standard I/O is connected to ttys.

Required Library

require “pty”

Module Functions

getpty(command)

spawn(command)

Reserves a PTY, executes command over the PTY, and returns an array of three elements (reading I/O, writing I/O, and the PID of the child process). With a block, the array is passed to the block as block parameters. SIGCHLD is captured while command is running.

protect_signal {...}

Protects block execution from SIGCHLD signal exception. This is required to invoke other subprocesses while using any PTY.

reset_signal

Disables to handle SIGCHLD while PTY subprocess is active.