pub fn wait(waitopts: WaitOptions) -> Result<Option<(Pid, WaitStatus)>>Expand description
wait(waitopts)—Wait for any of the children of calling process to
change state.
On success, returns the pid of the child process whose state changed, and the status of said process.
If NOHANG was specified in the options, and the selected child process
didn’t change state, returns None.