=over

=item wait

Behaves like the wait(2) system call on your system: it waits for a child
process to terminate and returns the pid of the deceased process, or
C<-1> if there are no child processes.  The status is returned in C<$?>.
Note that a return value of C<-1> could mean that child processes are
being automatically reaped, as described in L<perlipc>.

=back