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Top Forums UNIX for Dummies Questions & Answers Zombies Post 1181 by Neo on Tuesday 13th of February 2001 10:15:27 PM

02-13-2001

Administrator

FYI (maybe helpful), from the GNU ps manpage:

Quote:

Processes marked <defunct> are dead processes (so-called "zombies") that remain because their parent has not .... by init(8) if the parent process exits.

PROCESS STATE CODES
D uninterruptible sleep (usually IO)
R runnable (on run queue)
S sleeping
T traced or stopped
Z a defunct ("zombie") process

One simple way you can check for Zombie PIDs within a C program by calling the ps command with a system or exec call. Or you can find the source code for ps and take a look at how they do it and use the C code in the ps source to develop your own routine.

Neo

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LEARN ABOUT OSX

kill.d

kill.d(1m)							   USER COMMANDS							kill.d(1m)

NAME

       kill.d - snoop process signals as they occur. Uses DTrace.

SYNOPSIS

       kill.d

DESCRIPTION

       kill.d is a simple DTrace program to print details of process signals as they are sent, such as the PID source and destination, signal num-
       ber and result.

       This program can be used to determine which process is sending signals to which other process.

       Since this uses DTrace, only users with root privileges can run this command.

EXAMPLES

       Default output, print process signals as they are sent.
	      # kill.d

FIELDS

       FROM   source PID

       COMMAND
	      source command name

       TO     destination PID

       SIG    destination signal ("9" for a kill -9)

       RESULT result of signal (-1 is for failure)

DOCUMENTATION

       See the DTraceToolkit for further documentation under the Docs directory. The DTraceToolkit docs may include full worked examples with ver-
       bose descriptions explaining the output.

EXIT

       kill.d will run forever until Ctrl-C is hit.

AUTHOR

       Brendan Gregg [Sydney, Australia]

SEE ALSO

       dtrace(1M), truss(1)

version 0.90							   May 14, 2005 							kill.d(1m)