新手求教命名管道的问题

2017-04-05 10:07:26 232 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

Fluent Meshing边界层设置保姆级教程：从y+理论到实战避坑，看完就会本文详细解析了Fluent Meshing边界层设置的全过程，从y+理论基础到实战避坑技巧，帮助用户精准计算第一层高度并优化参数配置。通过案例演示和常见问题诊断，指导读者掌握边界层网格生成的核心技术，提升CFD模拟精度。特别针对不同湍流模型的y+要求提供具体参数建议。阅读详情



#include<stdio.h>

#include<stdlib.h>

#include<unistd.h>

#include<string.h>

#include<sys/stat.h>

#include<stdbool.h>

#include<fcntl.h>

#include<pthread.h>

#include<errno.h>



#define FIFO_READ "readfifo"

#define FIFO_WRITE "writefifo"



#define BUFSIZE 1024

bool connect=true;

void *read_from(void *arg)

{

        int rfd=-1;

        char buf[BUFSIZE]={0};

        int i;

        printf("waiting...\n");

        while((rfd=open(FIFO_READ,O_RDONLY))==-1)

        {

                sleep(1);

        }

        while(connect)

        {

                int len=read(rfd,buf,BUFSIZE);

                if(len>0)

                {

                        buf[len]='\0';

                        if(strncmp(buf,"byebye",6)==0)

                        {

                                printf("disconnection\n");

                                connect=false;

                                break;

                        }

                }

                printf("Other Side:%s\n",buf);

                printf("me:");

                fflush(stdout);

        }

        close(rfd);

        return NULL;

}

void *write_to(void *arg)

{

        int wfd;

        char buf[BUFSIZE]={0};

        int len;

        mode_t omd,nmd;

        nmd=S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH;

        //omd=umask(nmd);

        if(!mkfifo(FIFO_WRITE,S_IFIFO|0666))

        {

                printf("create fifo:%s error,because %s\n",FIFO_WRITE,strerror(errno));

                exit(EXIT_FAILURE);

        }

        //umask(omd);

        //chmod(FIFO_WRITE,nmd);

        wfd=open(FIFO_WRITE,O_WRONLY);

        if(wfd==-1)

        {

                printf("open fifo:%s error,becase %s\n",FIFO_WRITE,strerror(errno));

                exit(EXIT_FAILURE);

        }

        while(connect)

        {

                int n;

                printf("me:");

                n=read(STDIN_FILENO,buf,BUFSIZE);

                if(n<0)

                {

                        printf("read error\n");

                        exit(EXIT_FAILURE);

                }

                buf[n]='\0';

                if(strncmp(buf,"byebye",6)==0||!connect)

                {

                        write(wfd,buf,n);

                        close(wfd);

                        unlink(FIFO_WRITE);

                        exit(EXIT_SUCCESS);

                }

                write(wfd,buf,n);

                fflush(stdout);

        }

        return NULL;

}

int main(void)

{

        pthread_t thIDr,thIDw;

        pthread_create(&thIDr,NULL,&read_from,NULL);

        pthread_create(&thIDw,NULL,&write_to,NULL);

        pthread_join(thIDr,NULL);

        pthread_join(thIDw,NULL);

        return 0;

}