Socket for UDP?

ROOT
1

Hello,

I would like to receive UDP/IP ethernet packets.
I tried the following macro :

{
TServerSocket *ss = new TServerSocket(1025, kTRUE,1000,1000); // use port 1025
TSocket *s = ss->Accept(); // listen, and get a socket
Char_t buffer[80]; // buffer with some length to excercise
Int_t result;
result = s->RecvRaw(buffer,80);
cout << " (" << result << "): " << buffer << endl;
}

However, this code only reacts to TCP and does not react to UDP packets !
Is it possible to use UDP ? And how ?
A similar question was discussed in
root.cern.ch/root/roottalk/roottalk99/0612.html
and I could not find a positive answer.

I am using ROOT Version 4.00/03 on SuSE 9.0 Linux 2.4.21-215-athlon

2

Hi,

currently we’ve no support for UDP sockets in ROOT via TSystem and TSocket. We will provide support in the near future.

Cheers, Fons.

3

Hi,

thanks… I’ll eagerly await UDP support then.
I, really would like to use the convenience of
ROOT classes for this acquisition project.

cheers
Dirk

4

Just use the standard C socket libraries for UDP communication:

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <unistd.h>
#include <arpa/inet.h>

int s_source;
struct sockaddr_in local;
int len;
s_source = socket(AF_INET, SOCK_DGRAM, 0);
if (s_source < 0)
{
pexit(“stream socket”);
}
memset(&local, 0, sizeof(local));
local.sin_family = AF_INET;
local.sin_len = sizeof(local);
local.sin_port = htons(SOURCE_PORT);
local.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
if ( (len= sendto(s_source,data_buf_write,sizeof(data_buf_write),
0,(struct sockaddr *)&local,sizeof(local))) < 0 )
{
fprintf(stderr, “Error writting to socket.”);
}
close(s_source);

-Jason Thomas.