Boost: ASIO library application in RedHat Enterprise 5 (2)

Before getting familiar with ASIO, familiarize yourself with the BSD socket C/S model.

Client:

#include "stdio.h"#include "stdlib.h"#include "netinet/in.h"#include "sys/socket.h"#include "sys/types.h"#include "sys/wait.h"#include "arpa/inet.h"int _clientsock;struct sockaddr_in c_addr;int main(){        _clientsock = socket(AF_INET,SOCK_STREAM,0);        c_addr.sin_family=AF_INET;        c_addr.sin_port=htons(6001);        c_addr.sin_addr.s_addr=inet_addr("127.0.0.1");        connect(_clientsock,(struct sockaddr*)&c_addr,sizeof(struct sockaddr));        char buffer[128]={'\0'};        recv(_clientsock,buffer,128,0);        printf(buffer);        //close(_clientsock);        getchar();        return 0;}

Server:

#include "stdio.h"#include "stdlib.h"#include "sys/types.h"#include "netinet/in.h"#include "sys/socket.h"#include "sys/wait.h"#include "string.h"#include "arpa/inet.h"int _listensock;int _clientsock;struct sockaddr_in s_addr,c_addr;int main(){        _listensock = socket(AF_INET,SOCK_STREAM,0);        s_addr.sin_family=AF_INET;        s_addr.sin_port=htons(6001);        s_addr.sin_addr.s_addr=INADDR_ANY;        bind(_listensock,(struct sockaddr*)&s_addr,sizeof(struct sockaddr));        listen(_listensock,4);        while(1)        {                int l = sizeof(struct sockaddr_in);                _clientsock = accept(_listensock,(struct sockaddr*)&c_addr,(socklen_t*)&l);                printf("recv a client %s\n",inet_ntoa(c_addr.sin_addr));                if(1)                {                        send(_clientsock,"helloworld",26,0);                }                //close(_clientsock);        }        return 0;}

It is not clear what header file is required for close. Cainiao.