On Mon, 13 Jan 1997, Mike Long wrote:

Mike's right, but there seem to be a few typos in the original post.

> >From: Berndt Josef Wulf <wulf@ping.net.au>
> >Date: Tue, 14 Jan 1997 12:50:53 +1030 (CST)
> 
> >	snmp_vars.c: In function `var_ipAddrEntry':
> >	snmp_vars.c:2202: invalid operands to binary ==
> >	*** Error code 1
> 
> >the code in question looks like this:
> >
> >      if ( ifnet.if_addrlist == 0 )
> >		continue;      /* No address found for  interface */
> >
> >/usr/include/net/if.h  defines struct ifnet as:
> >
> >struct ifnet {                   
> >        void    *if_softc;        
> >	TAILQ_ENTRY(ifnet) if_list; 
> >		are chained */
> >	TAILQ_HEAD(, ifaddr) if_addrlist; 
> >	....
> >
> >and TAILQ_HEAD is defined in /usr/include/sys/queue.h
> >
> >#define TAILQ_HEAD(name, type)
> >struct name {
> >        struct type *tqe_next;
> >	struct type **tqe_prev;
> >}

I thnk those are the innards of a TAILQ_ENTRY, and a TAILQ_HEAD is:
struct name {                                                           \
        struct type *tqh_first; /* first element */                     \
        struct type **tqh_last; /* addr of last next element */         \
}

> >How do I get it to compile? The README file reports this package to be
> >working under NetBSD-1.1 and NetBSD-1.2.... which gives me some hope
> >to complete my project ;)
> 
> The compiler complains because the code is trying to compare a
> structure to a scalar.
> 
> You need to port any code which accesses if_addrlist to access it as a
> TAILQ instead of a straightforward linked list.  That means replacing
> 'if_addrlist' with 'if_addrlist.tqe_next', etc.

If it were a TAILQ_ENTRY, but for a TAILQ_HEAD, try if_addrlist.tqh_first.

Hmm. Can you guess what bit me hard in one part of a recent networking
port??? :-)

Take care,

Bill