笔记脑图

作业：多进程多线程并发服务器实现一遍提交。

多进程

#include <stdio.h>
#include <string.h>
#include <myhead.h>
#define IP "192.168.60.44"
#define PORT 6666
#define BACKLOG 20
void fun(int sss)
{
	if(sss==SIGCHLD)
	{
		while(waitpid(-1,NULL,0)>0);
	}
}
int main(int argc, const char *argv[])
{
	//
	if(signal(SIGCHLD,fun)==SIG_ERR)
	{
		perror("signal");
		return -1;
	}
	//
	int oldfd=socket(AF_INET,SOCK_STREAM,0);
	if(oldfd==-1)
	{
		perror("socket");
		return -1;
	}
	//
	int n=1;
	if(setsockopt(oldfd,SOL_SOCKET,SO_REUSEADDR,&n,sizeof(n))==-1)
	{
		perror("setsockopt");
		return -1;
	}
	printf("端口号快速复用成功\n");
	//
	struct sockaddr_in server={
		.sin_family=AF_INET,
		.sin_port=htons(PORT),
		.sin_addr.s_addr=inet_addr(IP),
	};
	if(bind(oldfd,(struct sockaddr *)&server,sizeof(server))==-1)
	{
		perror("bind");
		return -1;
	}
	//
	if(listen(oldfd,BACKLOG)==-1)
	{
		perror("listen");
		return -1;
	}

	struct sockaddr_in client;
	socklen_t client_len=sizeof(client);
	char buff[1024];
	while(1)
	{
		//
		int newfd=accept(oldfd,(struct sockaddr *)&client,&client_len);
		printf("%s发来连接请求\n",inet_ntoa(client.sin_addr));
		pid_t pid=fork();
		if(pid>0)
		{
			close(newfd);
		}
		else if(pid==0)
		{
			close(oldfd);
			while(1)
			{
				int len=recv(newfd,buff,sizeof(buff),0);
				if(len==0)
				{
					printf("%s客户端退出\n",inet_ntoa(client.sin_addr));
					break;
				}
				printf("客户端%s发来消息:%s\n",inet_ntoa(client.sin_addr),buff);
				strcat(buff,inet_ntoa(client.sin_addr));
				send(newfd,buff,sizeof(buff),0);
			}
			close(newfd);
			exit(0);
		}
		else
		{
			perror("fork");
			return -1;
		}
	}
	return 0;
}

多线程

#include <stdio.h>
#include <string.h>
#include <myhead.h>
#define IP "192.168.60.44"
#define PORT 6666
#define BACKLOG 1024
typedef struct 
{
	struct sockaddr_in client;
	int newfd;
}stu;
void *fun(void *sss)
{
	int newfd=((stu *)sss)->newfd;
	struct sockaddr_in client=((stu *)sss)->client;
	printf("%s发来消息\n",inet_ntoa(client.sin_addr));

	char buff[1024];
	while(1)
	{
		int len=recv(newfd,buff,sizeof(buff),0);
		if(len==0)
		{
			printf("客户端退出\n");
			break;
		}
		printf("收到消息:%s\n",buff);
		strcat(buff,"1973");
		send(newfd,buff,sizeof(buff),0);
	}
	pthread_exit(NULL);
}
int main(int argc, const char *argv[])
{
	int oldfd=socket(AF_INET,SOCK_STREAM,0);
	if(oldfd==-1)
	{
		perror("socket");
		return -1;
	}
	//
	struct sockaddr_in server={
		.sin_family=AF_INET,
		.sin_port=htons(PORT),
		.sin_addr.s_addr=inet_addr(IP),
	};
	if(bind(oldfd,(struct sockaddr *)&server,sizeof(server))==-1)
	{
		perror("bind");
		return -1;
	}
	//
	if(listen(oldfd,BACKLOG)==-1)
	{
		perror("listen");
		return -1;
	}
	struct sockaddr_in client;
	socklen_t client_len=sizeof(client);
	while(1)
	{
		int newfd=accept(oldfd,(struct sockaddr *)&client,&client_len);
		
		stu a;
		a.newfd=newfd;
		a.client=client;

		pthread_t tid;
		tid=pthread_create(&tid,NULL,fun,&a);
		if(tid==-1)
		{
			perror("pthread_create");
			return -1;
		}
		pthread_detach(tid);
	}
	return 0;
}