From owner-freebsd-hackers  Thu Jan 24  1:52:42 2002
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Date: Thu, 24 Jan 2002 11:52:09 +0200
From: Ruslan Ermilov <ru@FreeBSD.ORG>
To: cjclark@alum.mit.edu
Cc: hackers@FreeBSD.ORG
Subject: Re: sysctl(3) errnos wrong?
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References: <20020123025135.E83184@blossom.cjclark.org>
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Sounds like that, but changing it now would be too backwards incompatible.

On Wed, Jan 23, 2002 at 02:51:35AM -0800, Crist J . Clark wrote:
> Here is a quick, broken, program,
> 
> #include <sys/types.h>
> #include <sys/sysctl.h>
> #include <sys/time.h>
> #include <sys/socket.h>
> #include <net/if.h>
> #include <net/route.h>
> 
> #include <sysexits.h>
> 
> /*	#define	MIB_LEN	6	*/
> #define	MIB_LEN	5
> 
> int main(int argc,  char *argv[])
> {
> 	int mib[MIB_LEN];
> 	size_t rttsize;
> 
> 	mib[0] = CTL_NET;
> 	mib[1] = PF_ROUTE;
> 	mib[2] = 0;
> 	mib[3] = AF_INET;
> 	mib[4] = NET_RT_DUMP;
> /*	mib[5] = 0;	*/
> 
> 	if (sysctl(mib, MIB_LEN, NULL, &rttsize, NULL, 0) != 0)
> 		err(EX_OSERR, "sysctl(3) for table size failed");
> 
> 	return 0;
> }
> 
> This broken version will return,
> 
>   $ ./sysctlerr
>   sysctlerr: sysctl(3) for table size failed: Invalid argument
> 
> However, if we look at the errno descriptions in the sysctl(3)
> manpage, an EINVAL is returned when,
> 
>      [EINVAL]           The name array is less than two or greater than
>                         CTL_MAXNAME.
> 
>      [EINVAL]           A non-null newp is given and its specified length in
>                         newlen is too large or too small.
> 
> Neither of which is the case here. I think it should be returning one
> of these,
> 
>      [ENOTDIR]          The name array specifies an intermediate rather than
>                         terminal name.
> 
>      [EISDIR]           The name array specifies a terminal name, but the
>                         actual name is not terminal.
> 
> But "terminal" or "intermediate" names are not defined anywhere else
> in the manpage.
> -- 
> Crist J. Clark                     |     cjclark@alum.mit.edu
>                                    |     cjclark@jhu.edu
> http://people.freebsd.org/~cjc/    |     cjc@freebsd.org
> 
> To Unsubscribe: send mail to majordomo@FreeBSD.org
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-- 
Ruslan Ermilov		Oracle Developer/DBA,
ru@sunbay.com		Sunbay Software AG,
ru@FreeBSD.org		FreeBSD committer,
+380.652.512.251	Simferopol, Ukraine

http://www.FreeBSD.org	The Power To Serve
http://www.oracle.com	Enabling The Information Age

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