SYSTEM CALLS
    wait		- wait for a child to terminate

INVOCATION
    int wait( status )
      int  *status;

EXPLANATION
    Wait(2) returns if a child has already terminated, or if
    there are no children. Otherwise wait(2) blocks until a
    child does terminate.

    If wait(2) returns because a child terminated, and <status>
    is not NULL, then the lowest byte of the location pointed to
    by <status> will contain the signal number which terminated
    the child, 0 for normal termination. On a normal termination
    the next higher byte receives the value from the child's
    exit(3) call. If a core dump was generated then 0x80 is OR'ed
    into the status.

RESULTS
    o/w : Process number of terminated child.
     -1 : errno = ECHILD - No children.
		= EINTR  - A signal occurred.

REFERENCES
    _exit(2), pause(2), exit(3)