clarify how inetd works

Author: vladak

network.tex

@@ -536,7 +536,8 @@
 process can accept new connections meanwhile.  So, multiple connections may be
 served in parallel.
 \item After \funnm{fork}()ing but before performing I/O on the connection, the
-child may \funnm{exec}() -- that is how \texttt{inetd} works.
+child may redirect standard file descriptors to the socket and call
+\funnm{exec}() -- that is how \texttt{inetd} works.
 \item As you already know, by calling \funnm{waitpid}() you are getting rid of
 zombies. This only works because the \texttt{WNOHANG} flag is used,
 otherwise the parent would be blocked and the next connection would only be