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Top Forums Shell Programming and Scripting How to find pid of PS which executed by perl system function Post 302218928 by KevinADC on Sunday 27th of July 2008 03:17:32 PM
Old 07-27-2008
These lines look wrong:

f(kill 0 => $ps){print "process : $ps is alive\n";}
kill 1 , $ps;
sleep(1);
if(kill 0 => $ps){print "process : $ps is alive\n";}

the "=>" operator should be ">=" to compare values. "=>" is the comma operator that is used for a different purpose.

I know there are modules you can use to check pids but I don't know if they are anymore efficient than your method. Hopefully someone else will have a suggestion.
 

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explain_kill_or_die(3)					     Library Functions Manual					    explain_kill_or_die(3)

NAME
explain_kill_or_die - send signal to a process and report errors SYNOPSIS
#include <libexplain/kill.h> void explain_kill_or_die(pid_t pid, int sig); int explain_kill_on_error(pid_t pid, int sig); DESCRIPTION
The explain_kill_or_die function is used to call the kill(2) system call. On failure an explanation will be printed to stderr, obtained from the explain_kill(3) function, and then the process terminates by calling exit(EXIT_FAILURE). The explain_kill_on_error function is used to call the kill(2) system call. On failure an explanation will be printed to stderr, obtained from the explain_kill(3) function, but still returns to the caller. pid The pid, exactly as to be passed to the kill(2) system call. sig The sig, exactly as to be passed to the kill(2) system call. RETURN VALUE
The explain_kill_or_die function only returns on success, see kill(2) for more information. On failure, prints an explanation and exits, it does not return. The explain_kill_on_error function always returns the value return by the wrapped kill(2) system call. EXAMPLE
The explain_kill_or_die function is intended to be used in a fashion similar to the following example: explain_kill_or_die(pid, sig); SEE ALSO
kill(2) send signal to a process explain_kill(3) explain kill(2) errors exit(2) terminate the calling process COPYRIGHT
libexplain version 0.52 Copyright (C) 2009 Peter Miller explain_kill_or_die(3)
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