Date: Wed, 9 Sep 1998 12:45:31 +0200 (CEST) From: Andrzej Bialecki <abial@nask.pl> To: freebsd-current@FreeBSD.ORG Subject: Adding sysctl, part II Message-ID: <Pine.BSF.4.02A.9809091233260.19836-200000@korin.warman.org.pl>
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[-- Attachment #1 --]
Hi,
Well, I kind of figured out I probably need to use SYSCTL_PROC, and
applied the following patch to machdep.c:
Index: machdep.c
===================================================================
RCS file: /home/ncvs/src/sys/i386/i386/machdep.c,v
retrieving revision 1.307
diff -r1.307 machdep.c
213a214,222
> static int
> sysctl_hw_msgbuf SYSCTL_HANDLER_ARGS
> {
> return(sysctl_handle_opaque(oidp,msgbufp,MSGBUF_SIZE,req));
> }
>
> SYSCTL_PROC(_machdep, OID_AUTO, msgbuf, CTLTYPE_STRUCT|CTLFLAG_RD,
> 0, 0, sysctl_hw_msgbuf, "S,msgbuf","");
>
and I wrote a simple program to get the info (attached).
BUT... it returns garbage instead of msbguf contents...
Also, there is yet another problem which I need to solve: with above
sysctl I get only the msgbufp contents, and I need to also know the value
of struct msgbuf in order to know where to start and stop reading.
Any suggestions are appreciated...
Andrzej Bialecki
-------------------- ++-------++ -------------------------------------
<abial@nask.pl> ||PicoBSD|| FreeBSD in your pocket? Go and see:
Research & Academic |+-------+| "Small & Embedded FreeBSD"
Network in Poland | |TT~~~| | http://www.freebsd.org/~picobsd/
-------------------- ~-+==---+-+ -------------------------------------
[-- Attachment #2 --]
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/msgbuf.h>
#include <sys/sysctl.h>
int
main(int argc, char *argv[])
{
int i,len;
char *mib="machdep.msgbuf";
u_char *buf;
i=sysctlbyname(mib,NULL,&len,NULL,NULL);
if(i<0) {
perror("sysctl");
exit(-1);
}
fprintf(stderr,"len=%d\n",len);
buf=(u_char *)calloc(1,len);
sysctlbyname(mib,buf,&len,NULL,NULL);
fprintf(stderr,"len=%d\n",len);
write(1,buf,len);
}
help
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