编写一个简单的http server(Linux, gcc)
#include <iostream>
#include <pthread.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/socket.h>
#include <string.h>
#include <netinet/in.h>
#include <arpa/inet.h>
using namespace std;
bool stop = false;
void *thread_run(void *arg)
{
struct sockaddr_in addr;
memset(&addr, 0, sizeof(addr));
int fd;
addr.sin_family = AF_INET;
addr.sin_port = htons(8081);
addr.sin_addr.s_addr = INADDR_ANY;
if((fd = socket(AF_INET, SOCK_STREAM, 0))==-1)
{
std::cerr<<"Unable to Open the Socket"<<endl;
stop = true;
return NULL;
}
if (bind(fd, (struct sockaddr*)(&addr), sizeof(addr)) != 0)
{
std::cerr<<"Unable to bind the Socket"<<endl;
stop = true;
return NULL;
}
if (listen(fd, 50) == -1)
{
std::cerr<<"Unable to listen the Socket"<<endl;
stop = true;
return NULL;
}
while(true){
sockaddr client_addr;
unsigned int nLength;
int fdc = accept(fd, &client_addr, &nLength);
if (fdc == -1){
cerr<<"Unable to Connect with the client"<<endl;
return NULL;
} else{
char *request = new char[1000];
memset(request, 0, 1000);
read(fdc, request, 1000);
cout<<request<<endl;
char buf[] = "HTTP/1.1 200 OK\r\nServer: HTTP Server BY Zhengsq"
"\r\nContent-Type: text/html;charset=gb2312\r\n\r\n"
"<h1>This is The Server By zhengsq</h1>";
write(fdc, buf, strlen(buf));
close(fdc);
delete[] request;
}
}
}
void child_thread()
{
pthread_t t;
pthread_attr_t attr;
if (pthread_attr_init(&attr) != 0)
std::cerr << "Unable to launch a thread\n";
if(pthread_create(&t, &attr, thread_run, NULL) != 0)
std::cerr << "Unable to launch a thread\n";
if(pthread_attr_destroy(&attr) != 0)
std::cerr << "Unable to launch a thread\n";
if(pthread_detach(t) != 0)
std::cerr << "Unable to launch a thread\n";
}
int main() {
child_thread();
while(!stop)
{
sleep(1000);
}
return 0;
}
上述代码非常简单,专门开启一个线程用于处理socket,主线程sleep
上面到代码包括:开启线程到基本过程,注意线程的执行函数用到了函数指针 void *(*)(void *)
socket开启server端的一般步骤:
1、int fd = socket(AF_INET, SOCK_STREAM, 0),得到一个socket的handle(或者可以称之为指针)
2、bind(fd, &addr, sizeof(addr));
3、listen(fd, 4);
4、循环接受请求accept()
上面到步骤也符合建立一个server的一般逻辑,开辟一个通道,绑定通道到地址,监听通道,从通道接受请求,把数据通过通道送走……