Zombie - Revision history

Pbug: add a comma

2008-05-31T19:29:54Z

add a comma

← Older revision		Revision as of 12:29, 31 May 2008
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	The program is very simple it forks and the child exits immediately, the parent is in		The program is very simple it forks and the child exits immediately, the parent is in
	an endless loop. As soon as the parent is killed init inherits the zombie child and it		an endless loop. As soon as the parent is killed, init inherits the zombie child and it
	waits on it making it disappear.		waits on it making it disappear.

Pbug: sample zombie

2008-05-31T19:28:12Z

sample zombie

← Older revision		Revision as of 12:28, 31 May 2008
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	A zombie [[process]] is a process awaiting collection by a parent. To clean them up the parent [[process]] reaps the child with the [[wait]](2) [[syscall]], it knows when to do this because the kernel notifies it that the child has entered zombie state by means of the SIGCHLD [[signal]]. [[Orphan]]ed [[process]]es are reaped by [[init]].		A zombie [[process]] is a process awaiting collection by a parent. To clean them up the parent [[process]] reaps the child with the [[wait]](2) [[syscall]], it knows when to do this because the kernel notifies it that the child has entered zombie state by means of the SIGCHLD [[signal]]. [[Orphan]]ed [[process]]es are reaped by [[init]].

			A zombie in the process list (ps) is indicated with flag Z, here is an example of a
			user initiated zombie:

			francisco$ ps ax\|grep zombie
			16912 p2 Z 0:00.00 (zombie)
			16788 p2 I 0:00.01 ./zombie
			27973 p2 R+ 0:00.00 grep zombie (ksh)
			francisco$ kill 16788
			[1] + Terminated ./zombie

			The program is very simple it forks and the child exits immediately, the parent is in
			an endless loop. As soon as the parent is killed init inherits the zombie child and it
			waits on it making it disappear.

Pbug at 10:21, 27 October 2005

2005-10-27T10:21:46Z

← Older revision		Revision as of 03:21, 27 October 2005
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	A zombie [[process]] is a process awaiting collection by a parent. To clean them up the parent [[process]] reaps the child with the [[wait]](2) [[syscall]]. [[Orphan]]ed [[process]]es are reaped by [[init]].		A zombie [[process]] is a process awaiting collection by a parent. To clean them up the parent [[process]] reaps the child with the [[wait]](2) [[syscall]], it knows when to do this because the kernel notifies it that the child has entered zombie state by means of the SIGCHLD [[signal]]. [[Orphan]]ed [[process]]es are reaped by [[init]].

Pbug at 10:08, 27 October 2005

2005-10-27T10:08:05Z

← Older revision		Revision as of 03:08, 27 October 2005
Line 1:		Line 1:
	A zombie process is a process awaiting collection by a parent. To clean them up the parent process reaps the child with the [[wait]](2) [[syscall]]. [[Orphan]]ed ~~processes~~ are reaped by [[init]].		A zombie [[process]] is a process awaiting collection by a parent. To clean them up the parent [[process]] reaps the child with the [[wait]](2) [[syscall]]. [[Orphan]]ed [[process]]es are reaped by [[init]].

Pbug at 10:07, 27 October 2005

2005-10-27T10:07:28Z

← Older revision		Revision as of 03:07, 27 October 2005
Line 1:		Line 1:
	A zombie process is a process awaiting collection by a parent. ~~It is also called reaping~~ the child ~~from the parents perspective and is done~~ with the [[wait]](2) [[syscall]]. [[Orphan]]ed processes are reaped by [[init]].		A zombie process is a process awaiting collection by a parent. To clean them up the parent process reaps the child with the [[wait]](2) [[syscall]]. [[Orphan]]ed processes are reaped by [[init]].

Pbug at 10:05, 27 October 2005

2005-10-27T10:05:50Z

New page

A zombie process is a process awaiting collection by a parent. It is also called reaping the child from the parents perspective and is done with the [[wait]](2) [[syscall]]. [[Orphan]]ed processes are reaped by [[init]].