PS: you cannot use
on a defunct (zombie) process, because the process is already dead.
The name zombie comes from those cheap 1960's movies like 'Day of the Dead' - except in those movies you could apparently 'kill' those zombies.... you cannot kill something that is already dead in UNIX, it ain't the movies.
These 3 Users Gave Thanks to jim mcnamara For This Post:
When I ps -ef I see about 3 or 4 <DEFUNCT> things - what are these, and what causes them? Are they a concern? How can I fix them?
Thanks,
Michael (4 Replies)
Hey guys/gals. I am new to the site and fairly new to Unix/Linux. I have a master netbackup server (solaris) that I get pinged on occasionally regarding defunct processes. (Usually over 50 or so of them.) I know what a defunct process is, but what is it a product of? Just plain sloppy code? (From... (1 Reply)
Hi,
Can any one help me to get rid of defunct process on UNIX IBM AIX box. These processes started when the system was rebooted almost after 1 1/2 years. Once one defunct process is created then all the user ids get infected and in turn creates numerous defunct processes. We have tried... (6 Replies)
hello everybody!
Is there any way to identify if a process is defunct or if it is still running? (in C).
for example: by using a signal such as SIGCHLD?
thanx in advance (1 Reply)
Hi All,
Sorry to bother you all if my query is silly. Can you please clarify my doubts on defunct processes.
Actually coming to the scenario, i have a server which is under cluster environment. Server B is having problems with the defunct process. There was a cron scheduled on Server B which... (0 Replies)
Dear Sir / Madam,
We have two socket programs which are running in background. These two socket programs are creating defunct processes in HP-UX which were not happening in Compaq True64 UNIX. What is the root cause of these defunct processes and how can we correct it?
Your suggestion will be... (3 Replies)
HiI had a tool fail recently, on analysis I found it was cleaning up orphaned directories that had been created by specific processes that had died for some reason, thus failing to clean up after themselves.The directories were of the form /dir.pid. The tool would look to see if any instances of... (2 Replies)
I'd like to remove this defunct processes without rebooting. Or, I could remove this defuncts when the maximum allowable process is nearly reached, then send an email to the user/team. How can I determine the maximum allowable process that a server can handle? Any thoughts?
Jin@PRODUCTION: >... (3 Replies)
Discussion started by: Jin_
3 Replies
LEARN ABOUT DEBIAN
wait
wait(3) Library Functions Manual wait(3)NAME
wait - check child process status
SYNTAX
#include <wait.h>
int wait_nohang(&wstat);
int wait_stop(&wstat);
int wait_stopnohang(&wstat);
int wait_pid(&wstat,pid);
int wait_exitcode(wstat);
int wait_crashed(wstat);
int wait_stopped(wstat);
int wait_stopsig(wstat);
int pid;
int wstat;
DESCRIPTION
wait_nohang looks for zombies (child processes that have exited). If it sees a zombie, it eliminates the zombie, puts the zombie's exit
status into wstat, and returns the zombie's process ID. If there are several zombies, wait_nohang picks one. If there are children but no
zombies, wait_nohang returns 0. If there are no children, wait_nohang returns -1, setting errno appropriately.
wait_stopnohang is similar to wait_nohang, but it also looks for children that have stopped.
wait_stop is similar to wait_stopnohang, but if there are children it will pause waiting for one of them to stop or exit.
wait_pid waits for child process pid to exit. It eliminates any zombie that shows up in the meantime, discarding the exit status.
wait_stop and wait_pid retry upon error_intr.
STATUS PARSING
If the child stopped, wait_stopped is nonzero; wait_stopsig is the signal that caused the child to stop.
If the child exited by crashing, wait_stopped is zero; wait_crashed is nonzero.
If the child exited normally, wait_stopped is zero; wait_crashed is zero; and wait_exitcode is the child's exit code.
SEE ALSO wait(2), error(3)wait(3)