Date: Wed, 23 Jan 2002 02:51:35 -0800 From: "Crist J . Clark" <cristjc@earthlink.net> To: hackers@freebsd.org Subject: sysctl(3) errnos wrong? Message-ID: <20020123025135.E83184@blossom.cjclark.org>
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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
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