On Tue, Aug 29, 2000 at 03:56:25PM -0400, Vinod Mukkamala wrote:
> For some reason setsockopt function takes in the a address of a char
> as the 4th argument only.
[code example typos corrected]
>
> int tmp = 0; // to disable loop back
> setsockopt(s,
> IPPROTO_IP,
> IP_MULTICAST_LOOP,
> (char *)&tmp,
> sizeof(tmp));
>
> and it didn't work...
>
> but
>
> char tmp = 0; // to disable loop back
> setsockopt(s,
> IPPROTO_IP,
> IP_MULTICAST_LOOP,
> (char *)&tmp,
> sizeof(tmp));
>
> works perfectly fine.
Thank you a lot for your help, I will try this as soon as possible,
but there's something weird:
case IP_MULTICAST_LOOP:
/*
* Set the loopback flag for outgoing multicast packets.
* Must be zero or one. The original multicast API required a
* char argument, which is inconsistent with the rest
* of the socket API. We allow either a char or an int.
*/
if (sopt->sopt_valsize == 1) {
u_char loop;
error = sooptcopyin(sopt, &loop, 1, 1);
if (error)
break;
imo->imo_multicast_loop = !!loop;
} else {
u_int loop;
error = sooptcopyin(sopt, &loop, sizeof loop,
sizeof loop);
if (error)
break;
imo->imo_multicast_loop = !!loop;
}
break;
This piece of code is out of FreeBSD 4-STABLE's kernel source.
As you see it should deal with both: ints *and* chars. The
code seems to be correct, so I wonder why it's not working
with ints.
Björn Fischer
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