Linux网络编程【三】：TCP服务器多进程和多线程（http访问）版本

冷不防 2022-06-15 11:47 186阅读 0赞

为了让服务器同时接受多个客户端访问，所以需要多进程或者多线程

多进程版本：

#include<unistd.h>
    #include<stdio.h>
    #include<stdlib.h>
    #include<sys/types.h>
    #include<sys/socket.h>
    #include<netinet/in.h>
    #include<arpa/inet.h>
    #include<string.h>
    
    static void usage(const char* proc)
    {
    	printf("%s [ip] [port]", proc);
    }
    
    int startup(const char* _ip, int _port)
    {
    	int sock = socket(AF_INET, SOCK_STREAM, 0);
    	if(sock < 0)
    	{
    		perror("socket");
    		return 2;
    	}
    
    	struct sockaddr_in local;
    	local.sin_family = AF_INET;
    	local.sin_port = htons(_port);
    	local.sin_addr.s_addr = inet_addr(_ip);
        
    	//允许创建多个端口号相同但IP不同的套接字
    	int opt = 1;
    	setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
    
    	if(bind(sock, (struct sockaddr*)&local, sizeof(local)) < 0)
    	{
    		perror("bind");
    		return 3;
    	}
    
    	if(listen(sock, 5) < 0)
    	{
    		perror("listen");
    		return 4;
    	}
    	return sock;
    }
    int main(int argc, char* argv[])
    {
    	if(argc != 3)
    	{
    		usage(argv[0]);
    		return 1;
    	}
    	int listen_sock = startup(argv[1], atoi(argv[2]));
    
    	char buf[10240];
    	struct sockaddr_in client;
    	socklen_t len = sizeof(client);
    
    	while(1)
    	{
    		int new_sock = accept(listen_sock, (struct sockaddr*)&client, &len);
    		if(new_sock < 0)
    		{
    			perror("accept");
    			continue;
    		}
    		//多进程模式
    		pid_t id = fork();
    
    		if(id > 0)
    		{
    			//father
    			close(new_sock);
    			if(fork() > 0)
    			{
    				return 0;
    			}
    		}
    		else if(id == 0)
    		{
    			//child
    			close(listen_sock);
    			printf("connect...  ip is: %s  port is: %d \n", inet_ntoa(client.sin_addr), ntohs(client.sin_port));
    			while(1)
    			{
     				ssize_t s = read(new_sock, buf, sizeof(buf)-1);
    				if(s > 0)
    			 	{
     			  		buf[s] = '\0';
    					printf("client say# %s\n",buf);
    	 				write(new_sock, buf, strlen(buf));
    				}
    				else if(s == 0)
    				{
    	 				printf("client quit ...\n");
    			 		break; 
    				}
    				else
    	 				break;
    			}
    			return 0;
    
    		}
    		else
    		{
    			perror("fork");
    			close(listen_sock);
    			return 0;
    		}
    	}
    	return 0;
    }

多线程（HTTP）版本：

#include<unistd.h>
    #include<stdio.h>
    #include<stdlib.h>
    #include<sys/types.h>
    #include<sys/socket.h>
    #include<netinet/in.h>
    #include<arpa/inet.h>
    #include<string.h>
    
    static void usage(const char* proc)
    {
    	printf("%s [ip] [port]", proc);
    }
    
    int startup(const char* _ip, int _port)
    {
    	int sock = socket(AF_INET, SOCK_STREAM, 0);
    	if(sock < 0)
    	{
    		perror("socket");
    		return 2;
    	}
    
    	struct sockaddr_in local;
    	local.sin_family = AF_INET;
    	local.sin_port = htons(_port);
    	local.sin_addr.s_addr = inet_addr(_ip);
        
    	//允许创建多个端口号相同但IP不同的套接字
    	int opt = 1;
    	setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
    
    	if(bind(sock, (struct sockaddr*)&local, sizeof(local)) < 0)
    	{
    		perror("bind");
    		return 3;
    	}
    
    	if(listen(sock, 5) < 0)
    	{
    		perror("listen");
    		return 4;
    	}
    	return sock;
    }
    
    void* handler(void* arg)
    {
        char buf[10240];
    	int newsock = (int)arg;
    	//printf("connect...  ip is: %s  port is: %d \n", inet_ntoa(client.sin_addr), ntohs(client.sin_port));
    	while(1)
    	{
    		ssize_t s = read(newsock, buf, sizeof(buf)-1);
    		if(s > 0)
    		{
    			const char* msg = "HTTP/1.1 200 OK\r\n\r\n<html><h1>hello world</h1></html>\r\n";
     	 		buf[s] = '\0';
    			printf("- message:%s\n ",buf);
    	 		write(newsock, msg, strlen(msg));
    		}
    		else if(s == 0)
    			{
    				printf("client quit ...\n");
    			 	break; 
    			}
    			else
    	 			break;
    	}
    }
    
    int main(int argc, char* argv[])
    {
    	if(argc != 3)
    	{
    		usage(argv[0]);
    		return 1;
    	}
    	int listen_sock = startup(argv[1], atoi(argv[2]));
    
    	//char buf[10240];
    	struct sockaddr_in client;
    	socklen_t len = sizeof(client);
    
    	while(1)
    	{
    		int new_sock = accept(listen_sock, (struct sockaddr*)&client, &len);
    
    		if(new_sock < 0)
    		{
    			perror("accept");
    			return 2;
    		}
    		printf("connect success...\n  ip is: %s  port is: %d \n", inet_ntoa(client.sin_addr), ntohs(client.sin_port));
    		//多线程模式
    		
    		pthread_t tid;
    		if(pthread_create(&tid, NULL, handler, (void*)new_sock)<0)
    		{
    			perror("pthread");
    			return 3;
    		}
    		pthread_detach(&tid);
    	}		
    	return 0;
    }

效果如图：

![SouthEast][]

![SouthEast 1][]

![SouthEast 2][]

[SouthEast]: /images/20220615/3afb720a24c24e8190d53ed71a121cef.png
[SouthEast 1]: /images/20220615/3f7d6143a8b044dbacfa01297038d4db.png
[SouthEast 2]: /images/20220615/7acb96566ed1489c8d395394108e7104.png