my_client.c

这是一个网络编程的服务端

#include<stdio.h>
#include<unistd.h>
#include<stdlib.h>
#include<string.h>
#include<netdb.h>
#include<sys/types.h>
#include<netinet/in.h>
#include<strings.h>
#include<sys/socket.h>
#define SERVPORT 3333
#define SIZE 512
int main(int argc,char **argv)
{
    int ret;
    int res;
    char buf[SIZE];
    struct hostent *host;
    struct sockaddr_in addrser;
   
    if(argc!=2)
    {
        printf("use:./out <ip address>\n");
        exit(0);
    }
    host=gethostbyname(argv[1]);
    if(NULL == host)
    {
        printf("host is failure\n");
        exit(0);
    }
    printf("gethostbyname is success\n");
    addrser.sin_family=AF_INET;
    addrser.sin_port=htons(SERVPORT);
    addrser.sin_addr=*((struct in_addr *)host->h_addr);
    bzero(&(addrser.sin_zero),8);
    
    ret=socket(AF_INET,SOCK_STREAM,0);
    if(-1 == ret)
    {
       printf("socket failure \n");
       exit(0);
    }  
    printf("socket success  socket is %d\n",ret);

    res=connect(ret,(struct sockaddr*)&addrser,sizeof(struct sockaddr));
    if( -1 == res)
    {
        printf("connect is failure \n");
        exit(0);
    }
    printf("connect is seccess \n");
    while(1)
    {
        memset(buf,0,sizeof(buf));
        fgets(buf,SIZE,stdin);
        if((strncmp(buf,"end",3))==0)
          {
             break;
          }     
        write(ret,buf,512);        
        sleep(1);        
    }
    close(ret);
    return 0;
}