From owner-freebsd-current  Fri Apr 23  5:10: 8 1999
Delivered-To: freebsd-current@freebsd.org
Received: from k6n1.znh.org (unknown [207.109.235.51])
	by hub.freebsd.org (Postfix) with ESMTP
	id D1903151B1; Fri, 23 Apr 1999 05:09:31 -0700 (PDT)
	(envelope-from zach@uffdaonline.net)
Received: (from zach@localhost)
	by k6n1.znh.org (8.9.3/8.9.1) id MAA78614;
	Fri, 23 Apr 1999 12:05:50 GMT
	(envelope-from zach)
Date: Fri, 23 Apr 1999 07:05:49 -0500
From: Zach Heilig <zach@uffdaonline.net>
To: adrian@freebsd.org
Cc: freebsd-current@freebsd.org
Subject: Re: nice little kernel task for somebody
Message-ID: <19990423070549.A78489@k6n1.znh.org>
References: <9904221732.aa19138@salmon.maths.tcd.ie> <19990423091633.14103.qmail@ewok.creative.net.au>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
X-Mailer: Mutt 0.95.4i
In-Reply-To: <19990423091633.14103.qmail@ewok.creative.net.au>; from adrian@freebsd.org on Fri, Apr 23, 1999 at 05:16:33PM +0800
Sender: owner-freebsd-current@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.ORG

On Fri, Apr 23, 1999 at 05:16:33PM +0800, adrian@freebsd.org wrote:
> I don't know about that one, but the first one sounds easish.
> Since I've been messing around with procfs quite a bit lately,
> I'll spend some time later today poking around and produce a patch
> against -current .

I don't know how to do this, but I did notice this much: (the binary does
remain accessible even after it's removed, as long as it doesn't exit).

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

int main(int argc, char **argv) {
  int id;
  char cmd[128];
  unlink(argv[0]);
  id = getpid();
  printf("pid == %d\n", id);
  sprintf(cmd, "ls -l /proc/%d", id);
  system(cmd);
  exit(0);
}

$ cc foo.c
$ ./a.out
pid == 78597
total 4
-r--r--r--  1 zach  wheel     0 Apr 23 07:00 cmdline
--w-------  1 zach  wheel     0 Apr 23 07:00 ctl
-r--r--r--  1 zach  wheel    76 Apr 23 07:00 etype
-rwxrwxr-x  0 zach  wheel  3637 Apr 23 07:00 file
-rw-------  1 zach  wheel   176 Apr 23 07:00 fpregs
-r--r--r--  1 zach  wheel    76 Apr 23 07:00 map
-rw-r-----  1 zach  kmem      0 Apr 23 07:00 mem
--w-------  1 zach  wheel     0 Apr 23 07:00 note
--w-------  1 zach  wheel     0 Apr 23 07:00 notepg
-rw-------  1 zach  wheel    76 Apr 23 07:00 regs
-r--r--r--  1 zach  wheel     0 Apr 23 07:00 status
$ 

[note the '0' links for the binary]

-- 
Zach Heilig <zach@uffdaonline.net>


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