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//read.c
 
 
#include<sys/types.h>
#include<sys/stat.h>
#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>
#include<fcntl.h>
 
int main() {
 
    int fd = open("test", O_RDONLY);
    if(fd == -1) {
        perror("open");
        exit(0);
    }
    while(1) {
        char buf[1024] = {0};
        int len = read(fd, buf, sizeof(buf));
        if(len == 0) {
            perror("写端断开链接\n");
            break;
        }
        printf("recv buf: %s\n",buf);
    }
    close(fd);
}   

//write.c
 
 
#include<sys/types.h>
#include<sys/stat.h>
#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>
#include<fcntl.h>
#include<string.h>
 
int main() {
    int ret = access("test", F_OK);
    if(ret == -1) {
        perror("access");
        ret = mkfifo("test", 0664);
        if(ret == -1) {
            perror("mkfifo");
            exit(0);
        }
    }
    int fd = open("test", O_WRONLY);
    if(fd == -1) {
        perror("open");
        exit(0);
    }
    for(int i = 0; i < 100; i++) {
        char buf[1024];
        sprintf(buf,"hello, %d\n",i);
        printf("write data : %s", buf);
        write(fd,buf,strlen(buf));
        sleep(1);
    }
    close(fd);
}