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> In-Reply-To: <19990423091633.14103.qmail@ewok.creative.net.au>; from adrian@freebsd.org on Fri, Apr 23, 1999 at 05:16:33PM %2B0800 References: <9904221732.aa19138@salmon.maths.tcd.ie> <19990423091633.14103.qmail@ewok.creative.net.au>
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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>
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