/* fpipe.c
 *
 * Parent writing to child
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <wait.h>
#define MAX_LINE 80

int main(int argc, char **argv)
{
    pid_t pid;
    int stat_loc;

    int pfds[2];
    int ret;

    char buf[MAX_LINE+1];
    const char *testbuf = { "I'm a parent and I'm writing to you" };

    if (pipe(pfds) == 0)
    {
        pid = fork();
        if (pid == -1)
        {
            perror("fork");
            exit(EXIT_FAILURE);
        }

        if (!pid)
        {
            close(pfds[1]); /* child will not be writing anything */
            ret = read(pfds[0], buf, MAX_LINE);
            buf[ret] = 0;
            printf("Child read: %s\n", buf);
        }
        else
        {
            close(pfds[0]); /* parent will not be reading anything */
            ret = write(pfds[1], testbuf, strlen(testbuf));
            ret = waitpid(pid, &stat_loc, WCONTINUED);
        }
    }
    else
    {
        perror("pipe");
        exit(EXIT_FAILURE);
    }

    close(pfds[0]);
    close(pfds[1]);

    return 0;
}