wait(1) [netbsd man page]

WAIT(1) 						    BSD General Commands Manual 						   WAIT(1)

NAME

     wait -- await process completion

SYNOPSIS

     wait [pid]

DESCRIPTION

     If invoked with no arguments, the wait utility waits until all existing child processes in the background have terminated.

     Available operands:

     pid     If a pid operand is specified, and it is the process ID of a background child process that still exists, the wait utility waits until
	     that process has completed and consumes its status information, without consuming the status information of any other process.

	     If a pid operand is specified that is not the process ID of a child background process that still exists, wait exits without waiting
	     for any processes to complete.

     The wait utility exits with one of the following values:

     0	     The wait utility was invoked with no operands and all of the existing background child processes have terminated, or the process
	     specified by the pid operand exited normally with 0 as its exit status.

     >0      The specified process did not exist and its exit status information was not available, or the specified process existed or its exit
	     status information was available, and it terminated with a non-zero exit status.

     If the specified process terminated abnormally due to the receipt of a signal, the exit status information of wait contains that termination
     status as well.

STANDARDS

     The wait command is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible.

BSD
								   June 5, 1993 							       BSD

WAIT(2) 							System Calls Manual							   WAIT(2)

NAME

       wait - wait for process to terminate

SYNOPSIS

       wait(status)
       int *status;

       wait(0)

DESCRIPTION

       Wait  causes its caller to delay until a signal is received or 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 the case of several children several wait calls are needed to learn of all
       the deaths.

       If (int)status is nonzero, the high byte of the word pointed to receives the low byte of the argument of exit when  the	child  terminated.
       The  low  byte  receives the termination status of the process.	See signal(2) for a list of termination statuses (signals); 0 status indi-
       cates normal termination.  A special status (0177) is returned for a stopped process which has not terminated and can  be  restarted.   See
       ptrace(2).  If the 0200 bit of the termination 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) inherits the children.

SEE ALSO

       exit(2), fork(2), signal(2)

DIAGNOSTICS

       Returns -1 if there are no children not previously waited for.

ASSEMBLER

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

       The high byte of the status is the low byte of r0 in the child at termination.

																	   WAIT(2)