Date: Tue, 20 Dec 2005 15:09:27 +0100 From: Pawel Jakub Dawidek <pjd@FreeBSD.org> To: Michael Bushkov <bushman@rsu.ru> Cc: freebsd-current@FreeBSD.org, Ceri Davies <ceri@submonkey.net> Subject: Re: pidfile_check() possible function Message-ID: <20051220140927.GA1671@garage.freebsd.pl> In-Reply-To: <43A7D4A6.6000607@rsu.ru> References: <436A0C73.3010405@rsu.ru> <20051103140221.GF29387@submonkey.net> <43A009CB.2090800@rsu.ru> <20051219130928.GE63860@submonkey.net> <20051219135019.GF63860@submonkey.net> <43A6CC9E.6040109@rsu.ru> <20051219152505.GI63860@submonkey.net> <002c01c604c4$60ebe010$0100a8c0@jersey> <20051219183137.GA1103@odin.ac.hmc.edu> <43A7D4A6.6000607@rsu.ru>
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[-- Attachment #1 --] On Tue, Dec 20, 2005 at 12:53:42PM +0300, Michael Bushkov wrote: +> Hi! +> I've just had a situation, where I want to know the pid of the already running daemon, but i don't want to create the pidfile in case if there is no daemon running. Such a +> situation can occur if the daemon has some kind of controlling program. This program should be able to know the pid of the daemon (to send a signal, or for some logging +> purposes). +> With current pidfile API I don't see an appropriate way to do it. Pidfile_open() call can provide us with the PID. But if there is no daemon, this call will create the +> pidfile - and we'll have to use pidfile_remove() to do the cleanup. This behaviour doesn't seem to be appropriate. +> Is it possible to introduce some function to return the pid of the already running daemon or (-1), for example, if no daemon exists. Possible syntax can be: +> int pidfile_check(pid_t *pidptr); +> +> What do you think about that? Maybe... This function is not enough for sure, as you need to provide file to look for pid at least. Take a look at takepid() function in usr.bin/pkill/pkill.c to see how pkill(1) is doing this. -- Pawel Jakub Dawidek http://www.wheel.pl pjd@FreeBSD.org http://www.FreeBSD.org FreeBSD committer Am I Evil? Yes, I Am! [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (FreeBSD) iD8DBQFDqBCXForvXbEpPzQRAma3AKDwUQrq46oumKm+/haW7W7PibfhQQCghfjD NjLCrdlWLjNmrom9C2vPMb4= =t1WS -----END PGP SIGNATURE-----
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