[issue34663] Support POSIX_SPAWN_USEVFORK flag in posix_spawn

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

I discussed with Pablo (at the CPython sprint) about the case of FreeBSD.

On FreeBSD, posix_spawn() always uses vfork, so it can be surprising to get an error when using use_vfork=True. But, the error message is now very explicit: it mentions that a specific constant is not available on FreeBSD. The documentation is also clear on that point.

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nosy: +gregory.p.smith

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