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

int main(void) {
    // Make sure to compile sleep_print first:
    // gcc -o sleep_print sleep_print.c
    char *child_argv[] = {"./sleep_print", "5", "CHILD: Awake and Done", NULL};
    pid_t child_pid = fork();
    if (child_pid == 0) {
        execvp(child_argv[0], child_argv);
        perror("errno indicates");
        printf("Couldn't run '%s': is it compiled??\n", child_argv[0]);
        exit(1);
    }

    while (1) {
        printf("Type text then press enter to check on child:\n");
        char buffer[1024];
        char *input = fgets(buffer, 1024, stdin);
        input[strlen(input) - 1] = '\0';  // Eliminate newline in buffer
        printf("Entered text: '%s'\n", input);

        printf("Waiting\n");
        int status;
        pid_t pid = waitpid(child_pid, &status, 0);
        if (pid == child_pid) {
            if (WIFEXITED(status)) {
                printf("CHILD FINISHED: %d", WEXITSTATUS(status));
                printf("\n");
                break;
            }
        } else {
            printf("Child not finished: wait returned %d\n", pid);
        }
        printf("\n");
    }
    printf("Exiting wait-loop\n");
    return 0;
}