// // // // // // // // // // // // // // // // // // // // // // // // 
//
//   CS270 Class Example
//
//   Author: Robert Heckendorn
//           University of Idaho
//
#include <stdio.h>
#include <stdlib.h>  // for system
#include <fcntl.h>   // for open and open flags
#include <errno.h>   // for errno
#include <string.h>  // for strerror
#include <unistd.h>  // for unlink

int main()
{
    pid_t pid;
    int sec;
    char *whoAmI;

    printf("\nBEGINNING TESTS\n");

    pid = fork();
    switch (pid) {
    case -1:
        perror("Fork failed");
        exit(1);
    case 0:
        sec = 20;
        whoAmI = (char *)"child";
        break;
    default:
        sec = 10;
        whoAmI = (char *)"parent";
        break;
    }

    for (int s=0; s<sec; s++) {
        printf("I am the %s", whoAmI);
        if (pid) printf(" of child %d", pid);
        printf("\n");
        sleep(1);
    }

    // have parent wait for child
    if (pid!=0) {
        int stat_val;

        // child_pid = wait(stat_val);
        printf("Parent waiting on child!\n");
        wait(&stat_val);  // note pass in the address of stat_val
        if (WIFEXITED(stat_val)) {
            printf("Parent reports child (PID: %d) exited with return code %d\n", pid, WEXITSTATUS(stat_val));
        }
        else {
            printf("Parent reports child (PID: %d) terminated abnormally\n", pid);
        }

        printf("Parent can now do stuff\n");
    }

    printf("%s terminates\n", whoAmI);

    return 0;
}