On 7 November 2010 06:16, dv <d...@pseudoterminal.org> wrote:
> ifconfig tells me that multicast is enabled for eth1, but not for lo. With
> purinrecv, I always get the same result, which is pasted below.
>
Can you try the attached test program, pumpkin.c. It iterates a million
times looking for eth1 with multicast flag set.
> One interesting thing is the first line - it always appears, does it mean
> anything? :)
>
It means "pudding", as in http://i.imgur.com/nJWjJ.jpg
> Oh, and one other thing I've noticed is that sometimes it takes up to a
> second for connect() to finish. Most of the time its done nearly instantly,
> though.
>
Would need some profiling as anything touching the networking stack or
filing system has potential to randomly block, common causes a normally NSS
lookups.
I would suggest try using the interface IP address instead of the adapter
name for a test run.
--
Steve-o
/* Verify multicast interface flag on enumeration.
*/
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <ifaddrs.h>
#include <net/if.h>
#define TEST_ITERATION_COUNT 1000 * 1000
int one_iteration (const char* ifname)
{
struct ifaddrs *ifaddr, *ifa;
int interface_matches = 0;
int status = EXIT_SUCCESS;
if (-1 == getifaddrs (&ifaddr)) {
perror ("getifaddrs");
return EXIT_FAILURE;
}
for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
if (NULL == ifa->ifa_addr)
continue;
switch (ifa->ifa_addr->sa_family) {
/* ignore raw entries on Linux */
#ifdef AF_PACKET
case AF_PACKET:
continue;
#endif
case AF_INET:
break;
default:
continue;
}
if (0 != strcmp (ifname, ifa->ifa_name))
continue;
if ((ifa->ifa_flags & IFF_LOOPBACK) || !(ifa->ifa_flags & IFF_MULTICAST)) {
printf ("ifa_flags %d.\n", ifa->ifa_flags);
status = EXIT_FAILURE;
continue;
}
if (interface_matches++) {
puts ("duplicate matching interface.");
status = EXIT_FAILURE;
break;
}
}
if (0 == interface_matches) {
puts ("no matching interface found.");
status = EXIT_FAILURE;
}
freeifaddrs (ifaddr);
return status;
}
int main (void)
{
const char ifname[] = "eth1";
int i;
for (i = TEST_ITERATION_COUNT; i; i--)
assert (EXIT_SUCCESS == one_iteration (ifname));
return EXIT_SUCCESS;
}
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