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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 operat-
ing 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.
SunOS 5.10 Last change: 19 Jun 2006 1
User Commands preap(1)
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 pro-
cess 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 attri-
butes:
____________________________________________________________
| 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. Oth-
erwise, applying preap can damage the parent process in
unpredictable ways.
SunOS 5.10 Last change: 19 Jun 2006 2
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This page was generated on Wed Sep 12 11:25:16 GMT 2007
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