#include <unistd.h>
#include <string.h>
#include <stdlib.h>

int main()
{
    int pipefd[2];
    int r = pipe(pipefd);
    if (r == -1)
        return EXIT_FAILURE;

    int pid = fork();
    if (!pid)
    {
        dup2(pipefd[0], STDIN_FILENO);
        close(pipefd[0]);
        close(pipefd[1]);
    }
    else
    {
        dup2(pipefd[1], STDOUT_FILENO);
        close(pipefd[0]);
        close(pipefd[1]);
    }

    int offset = 0;
    char buf[4096];
    while (1)
    {
        r = read(STDIN_FILENO, buf + offset, sizeof(buf) - offset);
        if (r == 0)
        {
            if (pid)
            {
                close(STDOUT_FILENO);
                sleep(10);
            }
            return EXIT_SUCCESS;
        }
        offset += r;
        r = write(STDOUT_FILENO, buf, offset);
        memmove(buf, buf + r, offset - r);
        offset -= r;
    }

    return EXIT_SUCCESS;
}