#include <assert.h>
#include <fcntl.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <unistd.h>

int main(int argc, char *argv[]) {
    int fd = open("README", O_RDONLY);
    assert(fd >= 0);

    int rc = fork();
    if (rc == 0) {
        rc = lseek(fd, 10, SEEK_SET);
        printf("child: offset %d\n", rc);
        return 0;
    } else if (rc > 0) {
        (void) wait(NULL);
        printf("parent: offset %d\n", (int) lseek(fd, 0, SEEK_CUR));
    }

    return 0;
}