Processes' FIBs

[Bjoern A. Zeeb]

On 11. Jan 2012, at 15:06 , Oliver Fromme wrote:

> 
> Bjoern A. Zeeb wrote:
>> On 10. Jan 2012, at 20:32 , Paul A. Procacci wrote:
>>> On Tue, Jan 10, 2012 at 09:12:17PM +0100, Oliver Fromme wrote:
>>>> Is there a way to find out the default FIB number of a
>>>> process (from a shell script)? I've checked the
>>>> manpages of ps and procstat, but they don't mention
>>>> FIBs. I'm using stable/8, if that matters.
>>> 
>>> http://lists.freebsd.org/pipermail/freebsd-questions/2009-April/196532.html
>>> 
>>> Not sure about ps/et al, but you can do it according to that post.  Nearly 2 years old now.
> 
> To be honest, I prefer not to fumble around in kernel memory
> with kgdb in a shell script.  Also, it requires root privilege
> (setfib does not).
> 
>> If you are thinking in terms of multiple forwarding information bases, yes
>> sysctl net.my_fibnum
> 
> Thanks.  Would it make sense to document that in setfib(1)?
> 
> However, I need to find the default FIB number for arbitrary
> processes, not necessarily for the calling process.
> 
> I'm currently looking at the source code of ps, but adding
> a field for the FIB isn't as trivial as I thought because
> ps only sees struct kinfo_proc (via sysctl kern.proc.*)
> which doesn't contain the FIB.  procstat does the same.
> 
> I'm currently trying to write a patch that copies p_fibnum
> from struct proc to struct kinfo_proc (just like p_nice,
> for example).  Does that make sense?  If so, does the patch
> below look reasonable?  (I've made it on a stable/8 system,
> but it should apply to 9 and 10, too.)


I am not sure it makes too much sense in ps.  It might make sense in
sockstat maybe?




> Best regards
>   Oliver
> 
> --- ./sys/sys/user.h.orig	2011-07-12 14:23:54.000000000 +0200
> +++ ./sys/sys/user.h	2012-01-11 15:35:50.000000000 +0100
> @@ -83,7 +83,7 @@
>  * it in two places: function fill_kinfo_proc in sys/kern/kern_proc.c and
>  * function kvm_proclist in lib/libkvm/kvm_proc.c .
>  */
> -#define	KI_NSPARE_INT	9
> +#define	KI_NSPARE_INT	8
> #define	KI_NSPARE_LONG	12
> #define	KI_NSPARE_PTR	6
> 
> @@ -177,6 +177,7 @@
> 	 */
> 	char	ki_sparestrings[68];	/* spare string space */
> 	int	ki_spareints[KI_NSPARE_INT];	/* spare room for growth */
> +	int	ki_fibnum;		/* Default FIB number */
> 	u_int	ki_cr_flags;		/* Credential flags */
> 	int	ki_jid;			/* Process jail ID */
> 	int	ki_numthreads;		/* XXXKSE number of threads in total */
> --- ./sys/kern/kern_proc.c.orig	2011-07-12 14:19:26.000000000 +0200
> +++ ./sys/kern/kern_proc.c	2012-01-11 15:36:22.000000000 +0100
> @@ -775,6 +775,7 @@
> 	kp->ki_swtime = (ticks - p->p_swtick) / hz;
> 	kp->ki_pid = p->p_pid;
> 	kp->ki_nice = p->p_nice;
> +	kp->ki_fibnum = p->p_fibnum;
> 	PROC_SLOCK(p);
> 	rufetch(p, &kp->ki_rusage);
> 	kp->ki_runtime = cputick2usec(p->p_rux.rux_runtime);
> --- ./bin/ps/keyword.c.orig	2011-07-12 13:42:48.000000000 +0200
> +++ ./bin/ps/keyword.c	2012-01-11 15:44:27.000000000 +0100
> @@ -90,6 +90,7 @@
> 		NULL, 0},
> 	{"etime", "ELAPSED", NULL, USER, elapsed, NULL, 12, 0, CHAR, NULL, 0},
> 	{"f", "F", NULL, 0, kvar, NULL, 8, KOFF(ki_flag), INT, "x", 0},
> +	{"fib", "FIB", NULL, 0, kvar, NULL, 2, KOFF(ki_fibnum), INT, "d", 0},
> 	{"flags", "", "f", 0, NULL, NULL, 0, 0, CHAR, NULL, 0},
> 	{"ignored", "", "sigignore", 0, NULL, NULL, 0, 0, CHAR, NULL, 0},
> 	{"inblk", "INBLK", NULL, USER, rvar, NULL, 4, ROFF(ru_inblock), LONG,
> 
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-- 
Bjoern A. Zeeb                                 You have to have visions!
   It does not matter how good you are. It matters what good you do!