Running script(1) to get a controlling tty not supported due to signal handler issue

[mirabilos]

Same environment as in #149

root@XXXredactedXXX:~ # docker run --runtime=runsc -it debian:buster /bin/bash
root@65358b295bc9:/# script
Script started, file is typescript
script: cannot set signal handler: Function not implemented
                                                           root@65358b295bc9:/# exit
                                                                                    1|root@XXXredactedXXX:~ # 

[mirabilos]

It’s worse, /dev/tty does not exist and cannot be created.

[fvoznika]

script is failing because it uses signalfd4. See #139.

I0326 00:36:50.127229   97404 x:0] [   2] script X signalfd4(0xffffffff, 0x7fc40183eba0, 0x8, 0x80000) = 0x0 errno=38 (function not implemented) (69.676µs)

[ianlewis]

Added #385 for /dev/tty support

[kevinGC]

This no longer fails.