Client

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <time.h>
#include <pthread.h>

#define FIFO_SERVER "FIFO_SERVER"
#define FIFO_CLIENT "MYFIFO"
static bool flag = true;
void* threadFunc(void* thread_data){
    sleep(30);
    flag = false;
}
int main()
{
    unlink(FIFO_CLIENT);
    FILE* fp;
    char readbuf[80];

    if((fp = fopen(FIFO_SERVER, "w")) == NULL)
    {
        perror("open error");
        exit(1);
    }
    umask(0); // set file mask for creating files
    mknod(FIFO_CLIENT, S_IFIFO | 0777, 0); // create FIFO file

    // send data to server
    fputs(FIFO_CLIENT, fp);
    fclose(fp);


    // read echo replay from server
    int count = 0;
    if((fp = fopen(FIFO_CLIENT, "r")) == NULL)
    {
        perror("open error");
        exit(1);
    }
    pthread_t t1;
    pthread_create(&t1, NULL, threadFunc, NULL);
    while(flag){
        fgets(readbuf,1,fp);
        count++;
    }
    printf("Count symbols: %d\n", count);
    fclose(fp);
    return 0;
}