[issue32443] Add Linux's signalfd() to the signal module

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> Regardless, it'd be nice to have it available in the stdlib so it could be used if deemed useful.

Agreed.

> Signals are process global state, no thread compatible library can rightfully take ownership of a one.

But then is the signalfd() idea for subprocess doomed as well?

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