#include <sys/types.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include <limits.h>

int main()
{
    int fd[2];
    if (pipe(fd) < 0)
    {
        exit(EXIT_FAILURE);
    }
    fcntl(fd[1], F_SETFL, O_NONBLOCK);
    int bufs_count = 0;
    char BUF[PIPE_BUF];
    for(;;){
        int bytes_write = write(fd[1], BUF, PIPE_BUF);
        if(bytes_write < 1){
            break;
        }
        bufs_count += 1;
    }

    printf("pipe buffer size   : %d\n", PIPE_BUF);
    printf("pipe buffers count : %d\n", bufs_count);
    printf("default pipe size  : %d\n", bufs_count * PIPE_BUF);

    close(fd[0]);
    close(fd[1]);
}