hello ns-users
I am having a problem in understanding a statement
$udp0 sendmsg 0 Hello 0
It calls the sendmsg() function of UDPAgent class in udp.cc file, like,
if (strcmp(argv[1], "sendmsg") == 0) {
PacketData* data = new PacketData(1 + strlen(argv[3]));
strcpy((char*)data->data(), argv[3]);
sendmsg(atoi(argv[2]), data, argv[4]);
return (TCL_OK);
}
It means its calling sendmsg() in backend.
But when i want to see the data_ (member variable of PacketData)value in
UDPAgent::sendmsg(), like,
void UdpAgent::sendmsg(int nbytes, PacketData* data, const char* flags)
{
Packet *p;
int n;
printf("\n In UdpAgent::sendmsg():%d-->%s-->%s",nbytes,data->data(),flags);
//%s",(char *)data->data());
assert (size_ > 0);
(In this code, the argument was AppData, that i changed to PacketData to
access the data_ field in PacketData)
it shows me segmentation fault(core dumped), when i run the tcl script after
compilation of ns2.
I will really appreciate if any body can guide me about this a little bit.
Thanks a lot
Anuradha
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