1创建管道并且发送 fifo

#include <stdio.h>
//文件操作函数头文件
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>


int main(int argv,char *argc[])
{
    FILE *write_file;
    char write_txt[100];
    int i;
    char buf[512];
    int rlen;
    
   char *file_fifo="testfifo";
   char *file_src="fifosrc.txt";
    
    printf("start write file \n");
    write_file = fopen(file_src,"w+");
    if(NULL == write_file)
    {
      fprintf(stderr,"open file %s err \n",file_src);
      exit(EXIT_FAILURE);
    }
    
   for(i=0;i<10000;i++)
    {
        fprintf(write_file,"write file test %10d\n",i);
    }
    
    fclose(write_file);
    
    
    printf("write file done \n");
    
    
    
    
    printf("start write fifo \n");
    
    if(0!=access(file_fifo,F_OK))
    {
         if(-1 == mkfifo(file_fifo,0777))
         {
             fprintf(stderr,"creat fifo err \n");
             exit(EXIT_FAILURE);
             
         }
        
    }
   
   int fd_w,fd_r;
   
   fd_r=open(file_src,O_RDONLY);
   fd_w=open(file_fifo,O_WRONLY);
   if(fd_r==-1)
   {
           fprintf(stderr,"open %s  err \n",file_src);
             exit(EXIT_FAILURE);
   }
     if(fd_w==-1)
   {
           fprintf(stderr,"open %s  err \n",file_fifo);
             exit(EXIT_FAILURE);
   } 

   
   while((rlen=read(fd_r,buf,512))>0)
   {
       write(fd_w,buf,rlen);
       rlen=0;
  
   }
   
   close(fd_w);
   close(fd_r);
    
printf("write fifo done!");
    
    
    
    
    
}

2读取管道fifo

#include <stdio.h>



//文件操作函数头文件
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>


int main(int argv,char *argc[])
{

     char buf[512];
   int rlen;
   char *file_fifo="testfifo";
   char *file_des="readfromfifo.txt";
   int fd_w,fd_r;
     printf("RRRstart read fifo  \n");
   fd_w=open(file_des,O_CREAT|O_WRONLY,0777);
   fd_r=open(file_fifo,O_RDONLY);
   if(fd_r==-1)
   {
           fprintf(stderr,"RRRopen %s, err \n",file_fifo);
             exit(EXIT_FAILURE);
   }
     if(fd_w==-1)
   {
           fprintf(stderr,"RRRopen %s err \n",file_des);
             exit(EXIT_FAILURE);
   } 
   
   
 
   
   
   while((rlen=read(fd_r,buf,512))>0)
   {
       write(fd_w,buf,rlen);
       rlen=0;
  
   }
   
   
   
   close(fd_w);
   close(fd_r);
    
    
     printf("RRR read fifo ok \n");
    
    
    
    
    
}