編寫一個最爲簡單的tcp通信服務端。代碼如下:
#include <iostream>
#include <cstring>
using namespace std;
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
#include <unistd.h>
int main()
{
/*創建socket*/
int sd = socket(AF_INET, SOCK_STREAM, 0);
if (sd == -1)
{
cout << "socket creat error" << endl;
cout << errno << ":" << strerror(errno) << endl;exit(-1);
}
/*定義地址*/
struct sockaddr_in addr = {0};
addr.sin_family = AF_INET;
addr.sin_port = htons(12222);
inet_aton("192.168.56.11", &addr.sin_addr);
/*綁定地址*/
int bd_ret = bind(sd, (struct sockaddr*)&addr, sizeof(addr));
if (bd_ret != 0)
{
cout << "socket bind error" << endl;
cout << errno << ":" << strerror(errno) << endl;exit(-1);
}
/*監聽客戶端連接*/
int ls_ret = listen(sd, 5);
if (ls_ret != 0)
{
cout << "socket listen error" << endl;
cout << errno << ":" << strerror(errno) << endl;exit(-1);
}
/*獲取連接*/
struct sockaddr_in cli_addr = {0};
unsigned int addr_len = sizeof(cli_addr);
int sd_cli = accept(sd, (struct sockaddr*)&cli_addr, &addr_len);
if (sd_cli == -1)
{
cout << "socket accept error" << endl;
cout << errno << ":" << strerror(errno) << endl;exit(-1);
}
/*通信*/
char recv_buf[100] = {0};
int recv_count = recv(sd_cli, recv_buf, 55, 0);
if (recv_count <= 0)
{
cout << "socket recv error" << endl;
cout << errno << ":" << strerror(errno) << endl;exit(-1);
}
cout << "Client information" << endl;
cout << "cli ip: " << inet_ntoa(cli_addr.sin_addr) << endl;
cout << "cli port: " << ntohs(cli_addr.sin_port) << endl;
cout << "recv buf: " << recv_buf << endl;
/*退出*/
close(sd_cli);
close(sd);
return 0;
}