redhat enterprise 5 下的boost::asio 庫應用（2）

在熟悉asio之前，先來把bsd socket c/s模型熟悉下

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;
}

不清楚 ，close 需要什麼頭文件。菜鳥啊。