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debug IP multicast loopback

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This commit is contained in:
Paul Davis 2016-01-18 16:38:25 -05:00
parent 650ee5a317
commit 3fc50258b8
1 changed files with 16 additions and 2 deletions
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18
libs/midi++2/ipmidi_port.cc
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@ -194,7 +194,7 @@ IPMIDIPort::open_sockets (int base_port, const string& ifname)
#endif
struct ip_mreq mreq;
mreq.imr_multiaddr.s_addr = ::inet_addr("225.0.0.37");
mreq.imr_multiaddr.s_addr = ::inet_addr("225.0.0.37"); /* ipMIDI group multicast address */
mreq.imr_interface.s_addr = if_addr_in.s_addr;
if(::setsockopt (sockin, IPPROTO_IP, IP_ADD_MEMBERSHIP, (char *) &mreq, sizeof(mreq)) < 0) {
::perror("setsockopt(IP_ADD_MEMBERSHIP)");
@ -231,13 +231,27 @@ IPMIDIPort::open_sockets (int base_port, const string& ifname)
addrout.sin_addr.s_addr = ::inet_addr("225.0.0.37");
addrout.sin_port = htons (base_port);
int loop;
socklen_t size;
if (::getsockopt (sockin, IPPROTO_IP, IP_MULTICAST_LOOP, &loop, &size)) {
::perror ("getsockopt(IP_MULTICAST_LOOP)");
} else {
cout << "********* 1. multicast loopback: " << loop << " size was " << size << endl;
}
// Turn off loopback...
int loop = 0;
loop = 0;
if (::setsockopt(sockout, IPPROTO_IP, IP_MULTICAST_LOOP, (char *) &loop, sizeof (loop)) < 0) {
::perror("setsockopt(IP_MULTICAST_LOOP)");
return false;
}
if (::getsockopt (sockin, IPPROTO_IP, IP_MULTICAST_LOOP, &loop, &size)) {
::perror ("getsockopt(IP_MULTICAST_LOOP)");
} else {
cout << "********* 2. multicast loopback: " << loop << " size was " << size << endl;
}
#ifndef PLATFORM_WINDOWS
if (fcntl (sockin, F_SETFL, O_NONBLOCK)) {