view resources/network/udp-client-sweep.c @ 45:579c86316008 newapi

Major API overhaul. Moved to a single data structure for handling render functions. Functionally, generally similar except for scheduling within PRU loop function, which now uses interrupts from the PRU rather than polling. This requires an updated kernel.

/* UDP client in the internet domain */
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>

void error(const char *);
int main(int argc, char *argv[])
{
   int sock, n;
   unsigned int length;
   struct sockaddr_in server, from;
   struct hostent *hp;
   char buffer[256];
   
   if (argc != 3) { printf("Usage: server port\n");
                    exit(1);
   }

   server.sin_family = AF_INET;
   hp = gethostbyname(argv[1]);
   if (hp==0) error("Unknown host");

   bcopy((char *)hp->h_addr, 
        (char *)&server.sin_addr,
         hp->h_length);
   server.sin_port = htons(atoi(argv[2]));
   length=sizeof(struct sockaddr_in);
   while (1){
     sock= socket(AF_INET, SOCK_DGRAM, 0);
     if (sock < 0) error("socket");
     bzero(buffer,256);
//     printf("Please enter the message: ");
//     fgets(buffer,255,stdin);
     double freq=50;
     while(1){
       freq*=1.001;
       if(freq>20000) freq=50;
       sprintf(buffer,"%.4f;",freq);
       n=sendto(sock,buffer,
            strlen(buffer),0,(const struct sockaddr *)&server,length);
       if (n < 0) error("Sendto");
       usleep(1000);
     }
   }
   close(sock);
   return 0;
}

void error(const char *msg)
{
    perror(msg);
    exit(0);
}