RetroArch/libretro-common/utils/udp-test.c

/* public domain */
/* gcc -o udptest udp-test.c */

/* 
   will send "RETROPAD RIGHT" indefinely to player 1 
   to send to player 2 change port to 55401 and so on
*/

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <arpa/inet.h>
#include <sys/socket.h>

#define SERVER "127.0.0.1"
#define PORT 55400

void die(char *s)
{
    perror(s);
    exit(1);
}

int main(void)
{
    struct sockaddr_in si_other;
    int s, i, slen=sizeof(si_other);

    if ( (s=socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1)
    {
        die("socket");
    }

    memset((char *) &si_other, 0, sizeof(si_other));
    si_other.sin_family = AF_INET;
    si_other.sin_port = htons(PORT);

    if (inet_aton(SERVER , &si_other.sin_addr) == 0)
    {
        fprintf(stderr, "inet_aton() failed\n");
        exit(1);
    }
    while(1)
    {

        char message[10]="128";
        //send the message
        if (sendto(s, message, strlen(message) , 0 , (struct sockaddr *) &si_other, slen)==-1)
        {
            die("sendto()");
        }

    }

    close(s);
    return 0;
}