From owner-freebsd-arch  Fri Jan 19 12: 8:34 2001
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To: Kirk McKusick <mckusick@mckusick.com>
Cc: Alfred Perlstein <bright@wintelcom.net>, arch@FreeBSD.ORG
Subject: Re: dynamic vs static sysctls? 
In-Reply-To: Your message of "Tue, 16 Jan 2001 15:06:18 PST."
             <200101162306.PAA23554@beastie.mckusick.com> 
Date: Fri, 19 Jan 2001 21:08:00 +0100
Message-ID: <98602.979934880@critter>
From: Poul-Henning Kamp <phk@critter.freebsd.dk>
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In message <200101162306.PAA23554@beastie.mckusick.com>, Kirk McKusick writes:
>
>	>I want
>	>to do one call to sysctlnametomib (a new, but obviously trivial
>	>function) to return the numeric mib, and then use that mib on all
>	>the subsequent sysctl calls. 
>
>	As new-sysctl "designer" I think this is a good idea.  It's a trivial
>	thing to implement, so are there any warm and able bodies who want 
>	to try their hands at it and send the patch to me for review ?
>
>	--
>	Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
>	phk@FreeBSD.ORG         | TCP/IP since RFC 956
>	FreeBSD committer       | BSD since 4.3-tahoe    
>
>Here is my proposal (along with a test program for it).

Looks good, commit it :-)

Poul-Henning

>
>	Kirk
>
>=-=-=-=-=-=-=-=-=
>
>#include <sys/types.h>
>#include <sys/sysctl.h>
>
>int	sysctlnametomib __P((char *name, int *oidp, size_t *sizep));
>
>/*
> * This function uses a presently undocumented interface to the kernel
> * to walk the tree and get the type so it can print the value.
> * This interface is under work and consideration, and should probably
> * be killed with a big axe by the first person who can find the time.
> * (be aware though, that the proper interface isn't as obvious as it
> * may seem, there are various conflicting requirements.
> */
>int
>sysctlnametomib(char *name, int *oidp, size_t *sizep)
>{
>	int oid[2];
>	int error;
>
>	oid[0] = 0;
>	oid[1] = 3;
>
>	*sizep *= sizeof (int);
>	error = sysctl(oid, 2, oidp, sizep, name, strlen(name));
>	*sizep /= sizeof (int);
>	if (error < 0) 
>		return (error);
>	return (0);
>}
>
>/*
> * Test program for sysctlnametomib.
> *
> * Usage: sysctlnametomib name
> */
>main(ac, av)
>	int ac;
>	char *av[];
>{
>	int i, mib[CTL_MAXNAME];
>	size_t size;
>
>	if (ac < 2) {
>		printf("Usage: %s name\n", av[0]);
>		exit(1);
>	}
>	size = CTL_MAXNAME;
>	if (sysctlnametomib(av[1], mib, &size) < 0) {
>		perror("sysctlnametomib");
>		exit(1);
>	}
>	for (i = 0; i < size; i++)
>		printf("mib[%d] = %d\n", i, mib[i]);
>	exit(0);
>}
>

--
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.


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