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preap

preap(1)							   User Commands							  preap(1)

NAME

       preap - force a defunct process to be reaped by its parent

SYNOPSIS

       preap [-F] pid...

DESCRIPTION

       A  defunct  (or	zombie)  process  is  one  whose  exit	status has yet to be reaped by its parent. The exit status is reaped by way of the
       wait(3C), waitid(2), or waitpid(3C) system call. In the normal course of system operation, zombies can  occur,  but  are  typically  short-
       lived. This can happen if a parent exits without having reaped the exit status of some or all of its children. In that case, those children
       are reparented to PID 1. See init(1M), which periodically reaps such processes.

       An irresponsible parent process can not exit for a very long time and thus leave zombies on the system. Since the operating system destroys
       nearly all components of a process before it becomes defunct, such defunct processes do not normally impact system operation. However, they
       do consume a small amount of system memory.

       preap forces the parent of the process specified by pid to waitid(3C) for pid, if pid represents a defunct process.

       preap attempts to prevent the administrator from unwisely reaping a child process which might soon be reaped by the parent, if:

	   o	  The process is a child of init(1M).

	   o	  The parent process is stopped and might wait on the child when it is again allowed to run.

	   o	  The process has been defunct for less than one minute.

OPTIONS

       The following option is supported:

       -F    Forces the parent to reap the child, overriding safety checks.

OPERANDS

       The following operand is supported:

       pid    Process ID list.

USAGE

       Caution should be exercised when using the -F flag. Imposing two controlling processes on one victim process can lead to chaos.	Safety	is
       assured	only  if the primary controlling process, typically a debugger, has stopped the victim process and the primary controlling process
       is doing nothing at the moment of application of the proc tool in question.

EXIT STATUS

       The following exit values are returned by preap, which prints the exit status of each target process reaped:

       0	   Successfully operation.

       non-zero    Failure, such as no such process, permission denied, or invalid option.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWesu (32-bit)		   |
       |			     |SUNWesxu (64-bit) 	   |
       +-----------------------------+-----------------------------+

SEE ALSO

       proc(1), init(1M), waitid(2), wait(3C), waitpid(3C), proc(4), attributes(5)

WARNINGS

       preap should be applied sparingly and only in situations in which the administrator or developer has confirmed that defunct  processes  are
       not reaped by the parent process. Otherwise, applying preap can damage the parent process in unpredictable ways.

SunOS 5.11							    19 Jun 2006 							  preap(1)

AIX