/*************************************************************************
	> File Name : ipc_pip_named_read.c
	> Author : TL Song
	> EMail : songtianlun@frytea.com
	> Created Time : Mon 28 Dec 2020 03:51:07 PM CST
 ************************************************************************/
//reading
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <memory.h>
#define N 80

int main(void) {
    int in_file;
    int count = 1;
    char buf[N];
    if((mkfifo("myfifo",0666))<0)//创建有名管道
    {
        if(errno==EEXIST)//管道已经存在
        {
            printf("The fifo is exist.\n");
        }
        else{
            printf("creat myfifo failed!\n");
            exit(-1);
        }
    }
    else
    {
        printf("created by this process.\n");
    }
    in_file = open("myfifo",O_RDONLY);
    if (in_file < 0) {
        printf("Error in opening.\n");
        exit(1);
    }

    while ((count = read(in_file,buf,N)) > 0)
    {
        printf("received from fifo: %s\n", buf);
        memset(buf,0,N);
    }
    close(in_file);
    return 0;
}