svcadm(8)을 검색하려면 섹션에서 8 을 선택하고, 맨 페이지 이름에 svcadm을 입력하고 검색을 누른다.
preap(1)
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(8), 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 de‐
funct 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(2)
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(8).
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 options are supported:
-F Forces the parent to reap the child, overriding safety
checks.
-? Print usage message and immediately exit.
--help
OPERANDS
The following operand is supported:
pid Process ID list.
USAGE
Caution should be exercised when using the -F flag. Imposing two con‐
trolling 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 ques‐
tion.
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 in‐
valid option.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Availabilitysystem/core-os
SEE ALSO
proc(1), waitid(2), wait(3C), waitpid(3C), proc(5), attributes(7),
init(8)
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.
HISTORY
Support for the -? and --help options was added in Oracle Solaris
11.4.42.
The preap command, including support for the -F option, was introduced
in Solaris 9.
Oracle Solaris 11.4 29 Nov 2022 preap(1)