NAME                                                     WAIT(II)
     wait - wait for process to	terminate

SYNOPSIS
     (wait = 7.)
     sys  wait
     (process ID in r0)
     (status in	r1)

     wait(status)
     int *status;

DESCRIPTION
     Wait causes its caller to	delay  until  one  of  its  child
     processes	terminates.  If	any child has died since the last
     wait, return is immediate;	if there are no	children,  return
     is	 immediate  with the error bit set (resp. with a value of
     -1	returned).  The	normal return yields the  process  ID  of
     the  terminated child (in r0).  In	the case of several chil-
     dren several wait calls are  needed  to  learn  of	 all  the
     deaths.

     If	no error is indicated on return, the r1	high byte  (resp.
     the  high byte stored into	status ) contains the low byte of
     the child process r0 (resp. the argument of exit )	 when  it
     terminated.   The	r1 (resp.  status ) low	byte contains the
     termination status	of the process.	 See signal  (II)  for	a
     list  of  termination statuses (signals); 0 status	indicates
     normal termination.  A special status (0177) is returned for
     a	stopped	 process which has not terminated and can be res-
     tarted.  See ptrace (II).	If the 0200 bit	of  the	 termina-
     tion status is set, a core	image of the process was produced
     by	the system.

     If	the parent process  terminates	without	 waiting  on  its
     children, the initialization process (process ID =	1) inher-
     its the children.

SEE ALSO
     exit (II),	fork (II), signal (II)

DIAGNOSTICS
     The error bit (c-bit) is set if there are	no  children  not
     previously	waited for.  From C, a returned	value of -1 indi-
     cates an error.