🚀 go-pugleaf

Julien Curto wrote:

> Salut,
>
> 2 Questions :
>
> * Comment est-ce que peut-on r�cuperer un PID en C.
>
> * Comment peut-on savoir si un programme est d�j� activer en C. (ex. :
> par recherche du PID)
>
> D'avance merci
>
> Merci de r�pondre � l'adresse indiqu�e.
>
> M�ll#99

i don't know french to well but i'll try to help you :)

1) getpid() gets the pid of your current running program. (type man
getpid for
more info)

2) some programs (like dhcpcd & gpm ) use a 'lock-file' in the /var/run
dir
they store their pid's there in a file named for example dhcpcd.pid
when you try to start dhcpcd it checks if the file exists, if so : it
gives you
a warning and refuses to start unless you specify a parameter explicitly
stating you want to run it.
ofcourse these programs need to delete this file after they are done
executing :)

hope this helps

ns.

ps: consider writing your question in english next time :) lot's of ppl
read
newsgroups and don't know french

ps2: to all of you out there : i noticed i could read /var/run/dhcpcd.pid
as a
normal user. i know that with a kernel patch you can disable certain
programs
from being listed by for example 'ps' .. couldn't this be a security hole
??
you can still know as a user that a certain program is running.  (the
/var/run
dir is normally only used by programs started by root anyway, so why not
make it readable/writable only by root ?)
if this is a silly question, nevermind :)
i'm running slackware btw