sender.c

来自「基于网络编程的例子」· C语言 代码 · 共 51 行

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
 
int port = 6789;

void main() {
  int socket_descriptor;
  int iter = 0;
  char buf[80]; 
  struct sockaddr_in address;

/*
   Initialize socket address structure for Internet Protocols
*/ 
  bzero(&address, sizeof(address)); /* empty data structure */
  address.sin_family = AF_INET;
  address.sin_addr.s_addr = inet_addr("127.0.0.1"); 
  address.sin_port = htons(port);
/*
   Create a UDP socket
*/
  socket_descriptor = socket(AF_INET, SOCK_DGRAM, 0);
/*
   Loop 20 times (a nice round number)  sending data.
*/
  for (iter = 0; iter <= 20; iter++)
  {
    sprintf(buf,"data packet with ID %d\n", iter);
    sendto(socket_descriptor,
           buf, sizeof(buf),
           0, (struct sockaddr *)&address, sizeof(address));
  }
/*
   Send a termination message
*/
   sprintf(buf, "stop\n");
   sendto(socket_descriptor,
          buf, sizeof(buf),
          0, (struct sockaddr *)&address, sizeof(address));

   close(socket_descriptor); 
   printf("Messages Sent, Terminating\n");
   exit (0);
}