#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
 
int main(int argc, char *argv[])
{
	int fd;
	int ret;
	
	ret = mkfifo("my_fifo", 0666);
	if(ret != 0)
	{
		perror("mkfifo");
	}
	
	printf("before open\n");
	fd = open("my_fifo", O_WRONLY); //等着只读
	if(fd < 0)
	{
		perror("open fifo");
	}
	
	printf("after open\n");
	

        sleep(5);
        char send[100] = "100";
        write(fd, send, strlen(send));
        printf("write to my_fifo buf=%s\n", send);
       while (1)
       {
        /* code */
       }
       

    
	return 0;
}