Date: Thu, 15 Aug 2002 17:25:12 +0800 From: "ouyang kai" <oykai@msn.com> To: "Lambert Terry" <tlambert2@mindspring.com>, <freebsd-hackers@FreeBSD.ORG> Subject: Re: About 'sysctl' routine problem? Message-ID: <OE173Kegmprho5fimNY000222e7@hotmail.com>
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Dear Terry,
Thank you!
>Once again, we are talking about linker sets. This is a little
>more complex, though, since you have to take the "boot environment"
>into account, as well (the boot environment is the basis for a
>preinitialized sysctl space contents, seperate from the code you
>see in the kernel itself for the declarations of specific sysctl
>OIDs that are added to the ones exported before the kernel is even
>really started.
in kern_mib.c:
SYSCTL_NODE(, CTL_NET, net, CTLFLAG_RW, 0,
"Network, (see socket.h)");
-->
struct sysctl_oid_list sysctl_net_children;
static struct sysctl_oid sysctl__net =3D { =20
&sysctl_children, { 0 }, =20
CTL_NET, CTLTYPE_NODE|CTLFLAG_RW, (void*)&sysctl_net_children, =20
0, "net", 0, "N", 0 }; =20
DATA_SET(sysctl_set, sysctl__net);
It seem like the SYSINIT macro.
> TUNABLE_INT_DECL
> TUNABLE_INT_FETCH
> SYSCTL_DECL
> SYSCTL_NODE
> SYSCTL_INT
> SYSCTL_STRUCT
> SYSCTL_PROC
Whether do they register also in mi_startup() like other devices, when t=
he
'sipp' is looped to 'SI_SUB_TUNABLES'?
You said some specific sysctl OIDs can be added before the kernel is eve=
n really started,
I want to know when they will be added? Could you give me an example?
=20
I try to trace some routine from the 'ifconfig' program source code.
The following code is copied from 'ifconfig' program:
mib[0] =3D CTL_NET;
mib[1] =3D PF_ROUTE;
mib[2] =3D 0;
mib[3] =3D 0; /* address family */
mib[4] =3D NET_RT_IFLIST;
mib[5] =3D 0;
/* if particular family specified, only ask about it */
if (afp)
mib[3] =3D afp->af_af;
if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
errx(1, "iflist-sysctl-estimate");
From the SYSCTL_NODE(_net, PF_ROUTE, routetable, CTLFLAG_RD, sysctl_rtsoc=
k, "");
we can know the RF_ROUTE is the 'net's children', and its' handler is sys=
ctl_rtsock.
So, the kernel will call sysctl_rtsock, right?
in sysctl_rtsock function:
case NET_RT_IFLIST:
error =3D sysctl_iflist(af, &w);
So, this time, the kernel will call sysctl_iflist finally, right?
But I have some wonder how the 'sysctl' command transfer from user space =
to kernel space?
I find the line in sysproto.h:
int __sysctl __P((struct proc *, struct sysctl_args *));
I think whether the 'sysctl' is changed to '__sysctl' in kernel space?
If that is right, the __sysctl is how conect with sysctl_rtsock?
Thank you very much!:-)
Best Regards
Ouyang KaiGet more from the Web. FREE MSN Explorer download : http://exp=
lorer.msn.com
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<HTML><BODY STYLE=3D"font:10pt verdana; border:none;"><DIV>Dear Terry,<BR=
> Thank you!</DIV> <DIV>>Once again, we are talking about linker=
sets. This is a little<BR>>more complex, though, since you have=
to take the "boot environment"<BR>>into account, as well (the boot en=
vironment is the basis for a<BR>>preinitialized sysctl space contents,=
seperate from the code you<BR>>see in the kernel itself for the decla=
rations of specific sysctl<BR>>OIDs that are added to the ones exporte=
d before the kernel is even<BR>>really started.</DIV> <DIV> in ke=
rn_mib.c:<BR>SYSCTL_NODE(, CTL_NET, net, CT=
LFLAG_RW, 0,<BR> "Network, (see socket.h)");<BR>--><BR>struct sys=
ctl_oid_list sysctl_net_children;<BR>static struct sysctl_oid sysctl__net=
=3D { <BR> &sysctl_children, { 0 }, &nbs=
p; <BR> CTL_NET, CTLTYPE_NODE|CTLFLAG_RW, (void*)&sysctl_net_chi=
ldren, <BR> 0, "net", 0, "N", 0 }; <BR>DATA_SET(sysctl_set, sys=
ctl__net);</DIV> <DIV>It seem like the SYSINIT macro.<BR>> TUNABL=
E_INT_DECL<BR>> TUNABLE_INT_FETCH<BR>> SYSCTL_DECL<BR>>=
; SYSCTL_NODE<BR>> SYSCTL_INT<BR>> SYSCTL_STRUCT<BR>=
> SYSCTL_PROC<BR> Whether do they register also in mi_startu=
p() like other devices, when the<BR>'sipp' is looped to 'SI_SUB_TUNABLES'=
?<BR> You said some specific sysctl OIDs can be added before the ker=
nel is even really started,<BR>I want to know when they will be added? Co=
uld you give me an example?<BR> <BR>I try to trace some routine fro=
m the 'ifconfig' program source code.<BR>The following code is copied fro=
m 'ifconfig' program:<BR> mib[0] =3D CTL_NET;<BR> mib[1] =3D PF=
_ROUTE;<BR> mib[2] =3D 0;<BR> mib[3] =3D 0; /* address fam=
ily */<BR> mib[4] =3D NET_RT_IFLIST;<BR> mib[5] =3D 0;</DIV> <D=
IV> /* if particular family specified, only ask about it */<BR> =
;if (afp)<BR> mib[3] =3D afp->af_af;</DIV> <DIV> if (s=
ysctl(mib, 6, NULL, &needed, NULL, 0) < 0)<BR> errx(1, =
"iflist-sysctl-estimate");</DIV> <DIV>From the SYSCTL_NODE(_net, PF_ROUTE=
, routetable, CTLFLAG_RD, sysctl_rtsock, "");<BR>we can know the RF_ROUTE=
is the 'net's children', and its' handler is sysctl_rtsock.<BR>So, the k=
ernel will call sysctl_rtsock, right?<BR>in sysctl_rtsock function:<BR>&n=
bsp;case NET_RT_IFLIST:<BR> error =3D sysctl_iflist(af, &w=
);<BR>So, this time, the kernel will call sysctl_iflist finally, right?<B=
R>But I have some wonder how the 'sysctl' command transfer from user spac=
e to kernel space?<BR>I find the line in sysproto.h:<BR>int __sysctl=
__P((struct proc *, struct sysctl_args *));<BR>I think whether the 'sysc=
tl' is changed to '__sysctl' in kernel space?<BR>If that is right, the __=
sysctl is how conect with sysctl_rtsock?</DIV> <DIV> Thank yo=
u very much!:-)</DIV> <DIV>Best Regards<BR>Ouyang Kai</DIV></BODY></HTML>=
<br clear=3Dall><hr>Get more from the Web. FREE MSN Explorer download : =
<a href=3D'http://explorer.msn.com'>http://explorer.msn.com</a><br></p>;
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Dear Terry,
Thank you!
>Once again, we are talking about linker sets. This is a little
>more complex, though, since you have to take the "boot environment"
>into account, as well (the boot environment is the basis for a
>preinitialized sysctl space contents, seperate from the code you
>see in the kernel itself for the declarations of specific sysctl
>OIDs that are added to the ones exported before the kernel is even
>really started.
in kern_mib.c:
SYSCTL_NODE(, CTL_NET, net, CTLFLAG_RW, 0,
"Network, (see socket.h)");
-->
struct sysctl_oid_list sysctl_net_children;
static struct sysctl_oid sysctl__net =3D { =20
&sysctl_children, { 0 }, =20
CTL_NET, CTLTYPE_NODE|CTLFLAG_RW, (void*)&sysctl_net_children, =20
0, "net", 0, "N", 0 }; =09
DATA_SET(sysctl_set, sysctl__net);
It seem like the SYSINIT macro.
> TUNABLE_INT_DECL
> TUNABLE_INT_FETCH
> SYSCTL_DECL
> SYSCTL_NODE
> SYSCTL_INT
> SYSCTL_STRUCT
> SYSCTL_PROC
Whether do they register also in mi_startup() like other devices, when t=
he
'sipp' is looped to 'SI_SUB_TUNABLES'?
You said some specific sysctl OIDs can be added before the kernel is eve=
n really started,
I want to know when they will be added? Could you give me an example?
=20
I try to trace some routine from the 'ifconfig' program source code.
The following code is copied from 'ifconfig' program:
mib[0] =3D CTL_NET;
mib[1] =3D PF_ROUTE;
mib[2] =3D 0;
mib[3] =3D 0; /* address family */
mib[4] =3D NET_RT_IFLIST;
mib[5] =3D 0;
/* if particular family specified, only ask about it */
if (afp)
mib[3] =3D afp->af_af;
if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
errx(1, "iflist-sysctl-estimate");
From the SYSCTL_NODE(_net, PF_ROUTE, routetable, CTLFLAG_RD, sysctl_rtsoc=
k, "");
we can know the RF_ROUTE is the 'net's children', and its' handler is sys=
ctl_rtsock.
So, the kernel will call sysctl_rtsock, right?
in sysctl_rtsock function:
case NET_RT_IFLIST:
error =3D sysctl_iflist(af, &w);
So, this time, the kernel will call sysctl_iflist finally, right?
But I have some wonder how the 'sysctl' command transfer from user space =
to kernel space?
I find the line in sysproto.h:
int __sysctl __P((struct proc *, struct sysctl_args *));
I think whether the 'sysctl' is changed to '__sysctl' in kernel space?
If that is right, the __sysctl is how conect with sysctl_rtsock?
Thank you very much!:-)
Best Regards
Ouyang Kai
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