alpine on amd64 (under OpenBSD vmd) tries to do a clock_gettime. I don't know why, but it doesn't seem a problem to allow it.

allow only the F_GETFL and F_SETFL commands

on the latest fedora we glibc uses poll. On the other linux distro I tried (void), musl is probably providing poll as a ppoll wrapper.

this way, we can sandbox the listener with seccomp (todo) or capsicum (already done) and still have CGI scripts. When we want to exec, we tell the executor what to do, the executor executes the scripts and send the fd backt to the listener.