[cryptonector]

> That said, we actually didn’t pivot to vfork, we pivoted to posix_spawn for all but the case where we have to change working directory (had to support old glibc without the attr for that in spawn).

You can always accomplish that sort of thing by using a helper program that ultimately execs the desired one -- just prefix it and its arguments to the intended argv.

[trws]

Quite so. We would have too, but I left out the nasty bit that someone had at one point put a callback argument in an internal launching API that runs between fork and exec. Still working on squashing the last of those.