pub(crate) fn wait_exit(id: Id<'_>, flags: WaitPidFlag) -> Result<Option<i32>>Expand description
Wait for the exit of a child like waitid(2) with WEXITED and flags,
and return its exit code, the one of a signal like a shell reports it.
None if it still runs, with WNOHANG. The wait of nix fails with
EINVAL for a child killed by a real-time signal, which it does not
know, after the kernel reaped it already.