Date: Fri, 17 Sep 2004 01:55:05 +0200 From: Paolo Pisati <p.pisati@oltrelinux.com> To: FreeBSD_Hackers <freebsd-hackers@freebsd.org> Subject: sysctl stuff and your article in daemon news zine 200305 Message-ID: <20040916235505.GA8460@tin.it>
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Hi guys
i was looking for some material about sysctl stuff
when i found out phk's article in daemonews.
Sysctl are simple to use but i'm stuck
with SYSCTL_ADD_PROC().
Lets' take this:
sysctl_ctx_init(&xxx_clist);
o = SYSCTL_ADD_NODE(&xxx_clist,
SYSCTL_STATIC_CHILDREN(_net),
OID_AUTO, "xxx", CTLFLAG_RW, 0,
"Virtual Network XXX");
SYSCTL_ADD_INT(&xxx_clist, SYSCTL_CHILDREN(o), OID_AUTO,
"status", CTLFLAG_RW, &status, 0, "status of xxx");
SYSCTL_ADD_PROC(&xxx_clist, SYSCTL_CHILDREN(o), OID_AUTO,
"text_xxx", CTLTYPE_STRING|CTLFLAG_WR, string, 10,
sysctl_xxx_text_prg, "A", "baubaubau");
Here i create xxx under _net and start to add oid but,
while "status" appear in the sysctl tree, "text_xxx"
it doesn't show up.
And the function sysctl_xxx_text_prg is called
EVERY time i issue sysctl -a.
Why it works this way?
I mean, why don't "text_xxx" show up in sysctl tree?
And why sysctl -a trigger sysctl_xxx_text_prg?
I expected to see text_xxx near status in the sysctl tree,
to be a text buffer and that sysctl_xxx_text_prg get
called when i manipulate it and not everytime i list
the complete sysctl tree.
To put it clear, i would like something like
this:
net-
\
|-foo
|-bar
|-xxx-
|-... \
|-status
|-text_xxx
|-other_text_xxx
and i would like that ONLY when i modify
text_xxx my function sysctl_xxx_text_prg,
it reads the content of text_prg, modify it and
then write the results in other_text_xxx.
Well, i know i'm wrong somewhere, but i don't know
where... =P
I read some sources of geom and random but i couldn't
find where's my mistake, hope someone can help me... =P
Thank you.
--
Paolo
Italian FreeBSD User Group: http://www.gufi.org
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