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

int main(void) {
    pid_t rc = fork();
    if (rc < 0) {
        fprintf(stderr, "fork failed\n");
        return 1;
    } else if (rc == 0) {
        printf("hello from child\n");
    } else {
        wait(NULL);
        printf("hello from parent after wait\n");
    }
    return 0;
}