My daemon process is the child of init and init has the responsibility to remove it, once it turns zombie. But I want to ask why the daemon process which is child of init turns zombie in the first place. What measures I have to take to avoid this?
rish (1 Reply)
I have RHES4 machine with VRTSralus - Backup Exec agent installed there and running as a service. The agent hiccups sometimes and turns into defunct state. The problem is that I cannot kill it anyway., it stays there forever until the machine is rebooted. I wonder if anyone had such an experience... (1 Reply)
Hi
I need help because I don't know if it is possible to add a find inside a cat.
like I have a file with the pid of the process that use to became zombie. And I have the same pid stored in the var (pid1)
now, I have no clue how to check if the the find finds the pid or even if it's... (2 Replies)
dear friends,
in an interview they asked me what is zombie process. how we can identifying these process.if can you kill all zombie process. (8 Replies)
Is there an equivilant to the preap command in AIX that would allow me to get rid of a zombie process. I am new to AIX, moving over from Solaris and in the past I have been able to preap the pid on the defunct process to clean them up. I have looked around and the best I can see is that it may... (3 Replies)
Hello
I try to googled it , but I dint get sufficient answer :( ..
When I can see zombie running on server do they consume system resources or not ?
I have read that is not good to kill them with signal 9 cause it might cause more troubles .. why is kill -9 so harmfull?
thanks (2 Replies)
What is the overhead associated with zombie process?Is it running out of process-ID?:confused:
Since some information is stored in process table..
Thanks in Advance (4 Replies)
Discussion started by: jois
4 Replies
LEARN ABOUT REDHAT
kill
KILL(2) Linux Programmer's Manual KILL(2)NAME
kill - send signal to a process
SYNOPSIS
#include <sys/types.h>
#include <signal.h>
int kill(pid_t pid, int sig);
DESCRIPTION
The kill system call can be used to send any signal to any process group or process.
If pid is positive, then signal sig is sent to pid.
If pid equals 0, then sig is sent to every process in the process group of the current process.
If pid equals -1, then sig is sent to every process except for process 1 (init), but see below.
If pid is less than -1, then sig is sent to every process in the process group -pid.
If sig is 0, then no signal is sent, but error checking is still performed.
RETURN VALUE
On success, zero is returned. On error, -1 is returned, and errno is set appropriately.
ERRORS
EINVAL An invalid signal was specified.
ESRCH The pid or process group does not exist. Note that an existing process might be a zombie, a process which already committed termi-
nation, but has not yet been wait()ed for.
EPERM The process does not have permission to send the signal to any of the receiving processes. For a process to have permission to send
a signal to process pid it must either have root privileges, or the real or effective user ID of the sending process must equal the
real or saved set-user-ID of the receiving process. In the case of SIGCONT it suffices when the sending and receiving processes
belong to the same session.
NOTES
It is impossible to send a signal to task number one, the init process, for which it has not installed a signal handler. This is done to
assure the system is not brought down accidentally.
POSIX 1003.1-2001 requires that kill(-1,sig) send sig to all processes that the current process may send signals to, except possibly for
some implementation-defined system processes. Linux allows a process to signal itself, but on Linux the call kill(-1,sig) does not signal
the current process.
LINUX HISTORY
Across different kernel versions, Linux has enforced different rules for the permissions required for an unprivileged process to send a
signal to another process. In kernels 1.0 to 1.2.2, a signal could be sent if the effective user ID of the sender matched that of the
receiver, or the real user ID of the sender matched that of the receiver. From kernel 1.2.3 until 1.3.77, a signal could be sent if the
effective user ID of the sender matched either the real or effective user ID of the receiver. The current rules, which conform to POSIX
1003.1-2001, were adopted in kernel 1.3.78.
CONFORMING TO
SVr4, SVID, POSIX.1, X/OPEN, BSD 4.3, POSIX 1003.1-2001
SEE ALSO _exit(2), exit(3), signal(2), signal(7)Linux 2.5.0 2001-12-18 KILL(2)