参考：​​Linux系统编程之FIFO通信​​

写fifo

#include<string.h>
#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>
#include<errno.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<fcntl.h>

#define ERR_EXIT(m)\
    do\
{\
    perror(m);\
    exit(EXIT_FAILURE);\
}while(0)

int main()
{
       int infd;
       int outfd;
       char buf[1024];
       int n;

       mkfifo("tp.c", 0644);//创建命名管道文件
       infd = open("1.c", O_RDONLY);
       if(infd == -1)
           ERR_EXIT("open");

       outfd = open("tp.c", O_WRONLY);
       if(outfd == -1)
           ERR_EXIT("open");

       while((n = read(infd, buf, 1024)) > 0)//读取文件内容到buf上
       {
              write(outfd, buf, n);//变量内容写到管道文件中
       }

       close(infd);//关闭读操作
       close(outfd);//关闭写操作

       return 0;
}

读fifo

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<errno.h>
#include<unistd.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<fcntl.h>

#define ERR_EXIT(m)\
    do\
{\
    perror(m);\
    exit(EXIT_FAILURE);\
}while(0)

int main()
{
    int infd;
    int outfd;
    int n;
    char buf[1024];

    outfd = open("1.c.bak",O_WRONLY | O_CREAT | O_TRUNC, 0644);
    if(outfd == -1)
        ERR_EXIT("open");

    infd = open("tp.c",O_RDONLY);
    if(outfd == -1)
        ERR_EXIT("open");

    while((n = read(infd,buf,1024)) > 0)
    {
           write(outfd,buf,n);
    }

    close(infd);
    close(outfd);
    unlink("tp.c");

    return 0;
}