From owner-freebsd-hackers  Sat Oct 26  9: 8:29 2002
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 8036337B401
	for <freebsd-hackers@freebsd.org>; Sat, 26 Oct 2002 09:08:27 -0700 (PDT)
Received: from jive.SoftHome.net (jive.SoftHome.net [66.54.152.27])
	by mx1.FreeBSD.org (Postfix) with SMTP id E9E5943E75
	for <freebsd-hackers@freebsd.org>; Sat, 26 Oct 2002 09:08:26 -0700 (PDT)
	(envelope-from int@softhome.net)
Received: (qmail 23116 invoked by uid 417); 26 Oct 2002 16:08:16 -0000
Received: from shunt-smtp-out-0 (HELO softhome.net) (172.16.3.12)
  by shunt-smtp-out-0 with SMTP; 26 Oct 2002 16:08:16 -0000
Received: from int.homeunix.org ([218.58.241.112])
  (AUTH: LOGIN int@softhome.net)
  by softhome.net with esmtp; Sat, 26 Oct 2002 10:08:12 -0600
Date: Sun, 27 Oct 2002 00:07:54 +0800
From: Leslie Jackson <int@softhome.net>
To: freebsd-hackers@freebsd.org
Subject: [About SA_SIGINFO] Getting signal sender's PID and RUID
Message-Id: <20021027000754.064fbe11.int@softhome.net>
X-Mailer: Sylpheed version 0.7.6 (GTK+ 1.2.10; i386-portbld-freebsd4.6)
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Sender: owner-freebsd-hackers@FreeBSD.ORG
Precedence: bulk
List-ID: <freebsd-hackers.FreeBSD.ORG>
List-Archive: <http://docs.freebsd.org/mail/> (Web Archive)
List-Help: <mailto:majordomo@FreeBSD.ORG?subject=help> (List Instructions)
List-Subscribe: <mailto:majordomo@FreeBSD.ORG?subject=subscribe%20freebsd-hackers>
List-Unsubscribe: <mailto:majordomo@FreeBSD.ORG?subject=unsubscribe%20freebsd-hackers>
X-Loop: FreeBSD.ORG

I tried to use sigaction(with SA_SIGINFO sa_flags sepecified) to obtain the
catched signal's sending process ID and its real user ID. But all that i got
are both zeros.

Flatform: FreeBSD 4.6-Release on x86.

----------------------------------8<------------------------------------------
#include <sys/types.h>
#include <signal.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>

static void sig_usr1(int, siginfo_t *, void *);

int main(void)
{
	struct sigaction	act;

	memset(&act, 0, sizeof(act));
	act.sa_flags = SA_SIGINFO;
	act.sa_sigaction = sig_usr1;

	if (sigaction(SIGUSR1, &act, NULL) < 0) {
		perror("sigaction error");
		exit(1);
	}
	
	sleep(3);
	kill(getpid(), SIGUSR1);

	return 0;
}

static void sig_usr1(int signo, siginfo_t *info, void *ptr)
{
	printf("Got SIGUSR1\n");
	printf("sending process ID: %d\n", info->si_pid);
	printf("sending process real user ID: %d\n", info->si_uid);
}
----------------------------------8<------------------------------------------

Anything i've missed? Are there any alternative ways?

Any insights would be appreciated. TIA. :-)

-- 
Leslie Jackson

To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-hackers" in the body of the message