Linux网络编程——多进程并发服务器实现

void catch_child(int signum)
{
    
    
	while(waitpid(0,NULL,WNOHANG) > 0);
	return ;
}

int main(int argc,char *argv[])
{
    
    
	int lfd = 0,cfd = 0;
	pid_t pid;
	int ret;
	char buf[BUFSIZ];//4096
	struct sockaddr_in serv_addr,clit_addr;
	socklen_t clit_addr_len;

	serv_addr.sin_family = AF_INET;
	serv_addr.sin_port = htons(SERV_PROT);//SERV_PROT 9527
	serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
	
	lfd = socket(AF_INET,SOCK_STREAM,0);		
	
	bind(lfd,(struct sockaddr *)&serv_addr,sizeof(serv_addr));
	listen(lfd,128);
	clit_addr_len = sizeof(clit_addr);
	while(1){
    
    
		cfd = accept(lfd,(struct sockaddr *)&clit_addr,&clit_addr_len);
		pid = fork();
		if(pid < 0){
    
    
			perr_exit("fork error");
		}else if(pid == 0){
    
    	//子进程	
			close(lfd);
			break;
		}else{
    
    
			struct sigaction act;
			act.sa_handler = catch_child;
			sigemptyset(&act.sa_mask);
			act.sa_flags = 0;
			ret = sigation(SIGCHLD,&act,NULL);
			if(ret != 0){
    
    
				//error
			}
			close(cfd);
			continue;
		}
	}
	if(pid == 0){
    
    
		for(;;){
    
    
			ret = read(cfd,buf,sizeof(buf));
			if(ret == 0){
    
    
				close(cfd);
				exit(1);
			}
			//处理数据,转换成大写字母
			for(int i = 0;i < ret;i++)
				buf[i] = toupper(buf[i]);
			//
			write(cfd,buf,ret);
		}
	}
	
	return 0；
}