Support OS Signals

[iacore]

Currently, pressing Ctrl+C will abort all threads directly. Ideally, the user should be able to handle SIGINT and other signals gracefully.

[iacore]

I made a library for this: https://git.envs.net/iacore/janet-signal. I hard coded the signal numbers, so it may only be used on Linux.

This is only a prototype. Not sure how to get signal numbers consistentyl on other platforms other than having accompanied C code.

[sogaiu]

Currently I get a 404 for: https://git.envs.net/iacore/janet-signal

[iacore]

I set it to private. Now it should be visible to all.

[sogaiu]

Works here now, thanks :)

[amano-kenji]

Should it be closed? Janet has os/sigaction.

[iacore]

No. POSIX has more signal-related API than sigaction.