https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221700

--- Comment #10 from Ed Maste <ema...@freebsd.org> ---
A twitter discussion referenced this PR and the question of
async-signal-saftiness of closefrom:
https://twitter.com/koobs/status/1046674765585367041

Note that closefrom is in sigaction(2)'s list of async-signal-safe functions,
in the "Base Interfaces not specified as async-signal safe by POSIX, but
planned to be:" section. These are interfaces that are async-signal-safe in
FreeBSD, are not currently required to be so by POSIX, but are expected to be
so in the future. That said, I am not sure why closefrom is in that list and
not 'Extension Interfaces' as POSIX does not specify closefrom.

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