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.)
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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