pipeline won't close by CTRL + C or escape key if executed not in pipe

[hipyhop]

If pipeline is independently, not with data piped in, it becomes impossible to close with CTRL+C or the escape key. After killing the pipeline process from another terminal session the original terminal no longer receives CTRL+C events.

Steps to reproduce:

1. Run pipeline ./pipeline
2. Try and exit pipeline

Tested on: OSX 10.12.1 Terminal.app 2.7.1 zsh 5.2 and bash 3.2.57