Processes' FIBs

[Julian Elischer]

On 1/12/12 6:04 AM, Oliver Fromme wrote:
> Bjoern A. Zeeb wrote:
>   >  On 11. Jan 2012, at 15:06 , Oliver Fromme wrote:
>   >  >  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?
>
> Well, every process has a default FIB number (p_fibnum in
> struct proc).  It is a property of the process, just like
> the nice value for example.  So I think it makes sense for
> ps to be able to display it if the user asks for it.  This
> is the piece of information that I need.
>
> On the other hand, sockstat displays open sockets only.
> Of course, an internet socket has a FIB number associated
> with it, too, so sockstat could display it.  But that
> would be a completely different piece of information,
> and it wouldn't solve the actual problem that I'm currently
> facing.
>

I hadn't considered that a process would want to see the fib of another.
but of course it makes sense.
I see no problem the the attached patch except that it doesn't fix the 
man page for ps and setfib(2) or setfib(8) (or is it 1?)

etc.
if there are no objections, I can add this when it has been polished..

> 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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