03-22-2010
PID status
Given a PID ( suppose 1356) . How do i tell if its running or not
It would be really helpful if you could explain me ..
I got this answer from google but i am unable to understand it
**********************************************
Use kill() with 0 for the signal number.
There are four possible results from this call:
kill() returns 0
this implies that a process exists with the given PID, and the system
would allow you to send signals to it. It is system-dependent whether
the process could be a zombie.
kill() returns @math{-1}, errno == ESRCH
either no process exists with the given PID, or security enhancements
are causing the system to deny its existence. (On some systems, the
process could be a zombie.)
kill() returns @math{-1}, errno == EPERM
the system would not allow you to kill the specified process. This
means that either the process exists (again, it could be a zombie) or
draconian security enhancements are present (e.g. your process is not
allowed to send signals to anybody).
kill() returns @math{-1}, with some other value of errno
you are in trouble!
***********************************************
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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)