下面是一个TCP服务器程序。服务器进程在收到客户进程的连接请

下面是一个TCP服务器程序。服务器进程在收到客户进程的连接请求并建立连接成功后，将在标准输出上显示客户进程所在的主机IP地址，并使用write函数通过套接字向客户进程返回数据信息“Hello,client!”。填空并完成下列TCP服务器程序。

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <signal.h>
#include <netdb.h>
#include <unistd.h>
#include <arpa/inet.h>
#define SERVERPORT 3456
#define BACKLOG 5
int main(int argc,char *argv[])   {
  int sockfd,connetfd;
  struct sockaddr_in srvaddr; 
  struct sockaddr_in cliaddr;
  socklen_t sinSize;  
 
  sockfd = __________________(AF_INET,SOCK_STREAM,0); 
  if(sockfd <0)    {
    fprintf(stderr,"socket error when creating...\n");
    exit(1);   }
  bzero(&srvaddr,sizeof(srvaddr));
srvaddr.sin_family=AF_INET;
  srvaddr.sin_port = htons(  _______________________  ); 
srvaddr.sin_addr.s_addr = htonl(  _______________________  ); 
 
if( _______________ (sockfd,(struct sockaddr *)&srvaddr,sizeof(struct sockaddr))<0)  { 
     fprintf(stderr,"Bind error.\n");
     exit(1);     }
 
  if (_______________  (  _______________  ,BACKLOG)< 0)  {
    fprintf(stderr,"Listen error.\n");
    exit(1);   }
  sinSize = sizeof(struct sockaddr_in);
  for( ; ; )   {
 
     connetfd = _______________  (sockfd,(struct sockaddr *)&cliaddr,&sinSize);
     if (connetfd<0)  {
        fprintf(stderr,"accept error.\n");
        exit(1);
    }
fprintf(stderr,"server: have got a connection from %s\n",inet_ntoa(cliaddr.sin_addr));
 
if (write(_______________,"Hello,client!\n",15)==-1)    fprintf(stderr,"write error\n.");
 
    ______________________;
  }
 
  ________________________;
}