udpclient.c

sock编程 一个tcp源码一个udp源码 希望大家喜欢

#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <stdio.h>
#include <errno.h>
#include <unistd.h>

#include "connect_client.h"

const char *DAYTIME_PORT="13111";

int
main(int argc, char *argv[])
{
    int connfd, n, m;
    char *myhost;
    char timeStr[256];
    char letter;

    myhost = "localhost";
    if (argc > 1) 
        myhost=argv[1];

    connfd = connect_client(myhost, DAYTIME_PORT, AF_UNSPEC, SOCK_DGRAM);

    if (connfd < 0) {
         fprintf(stderr, 
                 "client error:: could not create connected socket "
                 "socket\n");
         return -1;
    }

    letter = '1';
    m= write(connfd, &letter, sizeof(letter));

    memset(timeStr, 0, sizeof(timeStr));

    n = read(connfd,
             timeStr,
             sizeof(timeStr));

    printf("%s\n", timeStr);
        
    close(connfd);

    return 0;
}