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Full Discussion: Help! Zombies
Top Forums UNIX for Dummies Questions & Answers Help! Zombies Post 302859743 by Don Cragun on Thursday 3rd of October 2013 04:39:16 PM
Old 10-03-2013
Quote:
Originally Posted by alister
You can't kill that which is already dead.

Regards,
Alister
Actually, you can kill zombies; they just won't notice that they've been killed (again).
Code:
kill 0 pid_of_zombie

will complete successfully telling you that the zombie hasn't been reaped yet.
Code:
kill TERM pid_of_zombie

will send a SIGTERM signal to the zombie and will complete successfully (assuming you have permission to send a signal to that process), but the zombie will never notice that the signal was sent nor be able to act upon that signal.
 

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KILL(2) 							System Calls Manual							   KILL(2)

NAME
kill - send signal to a process SYNOPSIS
kill(pid, sig); DESCRIPTION
Kill sends the signal sig to the process specified by the process number in r0. See signal(2) for a list of signals. The sending and receiving processes must have the same effective user ID, otherwise this call is restricted to the super-user. If the process number is 0, the signal is sent to all other processes in the sender's process group; see tty(4). If the process number is -1, and the user is the super-user, the signal is broadcast universally except to processes 0 and 1, the scheduler and initialization processes, see init(8). Processes may send signals to themselves. SEE ALSO
signal(2), kill(1) DIAGNOSTICS
Zero is returned if the process is killed; -1 is returned if the process does not have the same effective user ID and the user is not super-user, or if the process does not exist. ASSEMBLER
(kill = 37.) (process number in r0) sys kill; sig KILL(2)
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