---

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>

int main()
{
    int fd[2];
    pid_t childpid;
    char string[] = "Hello, world!\n";
    char readbuffer[80];

    pipe(fd);

    childpid = fork();

    if (childpid == 0)
    {
        close(fd[0]);

        write(fd[1], string, strlen(string));

        // close(fd[1]); удалили

        exit(0);
    }
    else
    {
        close(fd[1]);

        while (read(fd[0], readbuffer, sizeof(readbuffer)) > 0)
        {
            printf("%s", readbuffer);
        }

        close(fd[0]);

        wait(NULL);
    }

    return 0;
}