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This implements retrieving the contents of message buffer via sysctl(3)

Browse Source 
as "machdep.msgbuf". It's needed in case of using stripped kernels, where
normal dmesg (which has to use kvm) doesn't work.

The buffer is unwound, meaning that the data will be linear, possibly
with some leading NULLs.

Reviewed by:	Jordan K. Hubbard <jkh@freebsd.org>
This commit is contained in:
Andrzej Bialecki 1998-09-14 11:47:40 +00:00
parent 80e2640f8d
commit 309290c72b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=39176
2 changed files with 44 additions and 2 deletions
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23
sys/amd64/amd64/machdep.c
View File

@ -35,7 +35,7 @@
* SUCH DAMAGE.
*
* from: @(#)machdep.c 7.4 (Berkeley) 6/3/91
* $Id: machdep.c,v 1.306 1998/08/31 16:18:45 luoqi Exp $
* $Id: machdep.c,v 1.307 1998/09/01 02:04:12 kato Exp $
*/
#include "apm.h"
@ -211,6 +211,27 @@ sysctl_hw_availpages SYSCTL_HANDLER_ARGS
SYSCTL_PROC(_hw, OID_AUTO, availpages, CTLTYPE_INT|CTLFLAG_RD,
0, 0, sysctl_hw_availpages, "I", "");
static int
sysctl_machdep_msgbuf SYSCTL_HANDLER_ARGS
{
int error;
/* Unwind the buffer, so that is linear (possibly starting with
* some initial nulls.
*/
error=sysctl_handle_opaque(oidp,msgbufp->msg_ptr+msgbufp->msg_bufr,
msgbufp->msg_size-msgbufp->msg_bufr,req);
if(error) return(error);
if(msgbufp->msg_bufr>0) {
error=sysctl_handle_opaque(oidp,msgbufp->msg_ptr,
msgbufp->msg_bufr,req);
}
return(error);
}
SYSCTL_PROC(_machdep, OID_AUTO, msgbuf, CTLTYPE_STRING|CTLFLAG_RD,
0, 0, sysctl_machdep_msgbuf, "A","");
int bootverbose = 0, Maxmem = 0;
long dumplo;

23
sys/i386/i386/machdep.c
View File

@ -35,7 +35,7 @@
* SUCH DAMAGE.
*
* from: @(#)machdep.c 7.4 (Berkeley) 6/3/91
* $Id: machdep.c,v 1.306 1998/08/31 16:18:45 luoqi Exp $
* $Id: machdep.c,v 1.307 1998/09/01 02:04:12 kato Exp $
*/
#include "apm.h"
@ -211,6 +211,27 @@ sysctl_hw_availpages SYSCTL_HANDLER_ARGS
SYSCTL_PROC(_hw, OID_AUTO, availpages, CTLTYPE_INT|CTLFLAG_RD,
0, 0, sysctl_hw_availpages, "I", "");
static int
sysctl_machdep_msgbuf SYSCTL_HANDLER_ARGS
{
int error;
/* Unwind the buffer, so that is linear (possibly starting with
* some initial nulls.
*/
error=sysctl_handle_opaque(oidp,msgbufp->msg_ptr+msgbufp->msg_bufr,
msgbufp->msg_size-msgbufp->msg_bufr,req);
if(error) return(error);
if(msgbufp->msg_bufr>0) {
error=sysctl_handle_opaque(oidp,msgbufp->msg_ptr,
msgbufp->msg_bufr,req);
}
return(error);
}
SYSCTL_PROC(_machdep, OID_AUTO, msgbuf, CTLTYPE_STRING|CTLFLAG_RD,
0, 0, sysctl_machdep_msgbuf, "A","");
int bootverbose = 0, Maxmem = 0;
long dumplo;