多进程并发执行，多线程并发服务器

ubuntu@ubuntu:wangluobianchen$ cat 循环服务器模型.c
#include <myhead.h>
#define IP "192.168.124.39"
#define PORT 8888
void handle(int sss)
{
	if(sss=SIGCHLD)
	{
	while(waitpid(-1,NULL,WNOHANG)>0);//非阻塞循环回收子进程资源
	}
	printf("回收成功\n");
}
int main(int argc, const char *argv[])
{
	//1.创建套接字
	int oldfd=socket(AF_INET,SOCK_STREAM,0);
	if(oldfd==-1)
	{
		perror("oldfd");
		return -1;
	}
	int k=999;
	if(setsockopt(oldfd,SOL_SOCKET,SO_REUSEADDR,&k,sizeof(k))==-1)
	{
		perror("setsockopt");
		return -1;
	}
	printf("端口号快速复用成功\n");

	//2.绑定
	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;
	}
	//3.监听
	if(listen(oldfd,20)==-1)
	{
		perror("listen");
		return -1;
	}
	//4.父进程连接新的客户端
	struct sockaddr_in client;
	int client_len=sizeof(client);
	while(1)
	{

		int newfd=accept(oldfd,(struct sockaddr *)&client,&client_len);
		if(newfd==-1)
		{
			perror("accept");
			return -1;
		}
		printf("%s:%d\n",inet_ntoa(client.sin_addr),ntohs(client.sin_port));//输出新客户端
		//创建子父进程
		pid_t pid =fork();
		char buff[1024];
		if(pid>0)
		{
			if(signal(SIGCHLD,handle)==SIG_ERR)//绑定子进程退出时的信号
			{
				perror("signal");
				return -1;
			}
			//父进程关闭新的描述符
			close(newfd);
		}
		else if(pid==0)
		{
			//子进程关闭旧的描述符消息收发
			close(oldfd);
			while(1)
			{
				int res=recv(newfd,buff,sizeof(buff),0);
				if(res==0)
				{
					printf("客户端已经退出\n");
					break;
				}
				printf("%s\n",buff);
				strcat(buff,"今天周日");
				send(newfd,buff,sizeof(newfd),0);
			}
			exit(EXIT_SUCCESS);//子进程退出
					}
					else 
					{
					perror("fork");
					return -1;
					}
					}
					close(oldfd);
					return 0;
					}

线程

#include <myhead.h>
#define IP "19.168.124.39"
#define PORT 6666
void *fun(void *fd)
{
	int newfd=*(int *)fd;
	char buff[1024];
	while(1)
	{
		int res=recv(newfd,buff,sizeof(buff),0);
		if(res==0)
		{
			printf("客户端下载\n");
			break;
		}
		printf("%s\n",buff);
		strcat(buff,"5dianfangxue");
		send(newfd,buff,sizeof(buff),0);
	}
	pthread_exit(NULL);//子线程退出
}

int main(int argc, const char *argv[])
{
	int oldfd=socket(AF_INET,SOCK_STREAM,0);
	if(oldfd==-1)
	{
		perror("socket");
		return -1;
	}
	//绑定
	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;
	}
	//监听
	if(listen(oldfd,20)==-1)
	{
		perror("litsen");
		return -1;
	}
	struct sockaddr_in client;
	int client_len =sizeof(client);
	int newfd;
	pthread_t tid;
	while(1)
	{
		//接收新客户的连入请求
		newfd=accept(oldfd,(struct sockaddr *)&client,&client_len);
		if(newfd==-1)
		{
			perror("accept");
			return -1;
			
		}
		//创建子线程与客户端通话
		if(pthread_create(&tid,NULL,fun,&newfd)==-1)
		{
			perror("pthread_create");
			return -1;
		}
	}
		pthread_join(tid,NULL);//回收子线程资源
		close(newfd);
		close(oldfd);
	
	return 0;
}