#include <pthread.h>
#include <stdio.h>
#include <unistd.h>

void prepare(void) {
	printf("preparing from %d\n", getpid());
}

void parent(void) {
	printf("parent from %d\n", getpid());
}

void child(void) {
	printf("child from %d\n", getpid());
}

int main(void) {
	pid_t pid;

	pthread_atfork(prepare, parent, child);
	if ((pid = fork())) {
		printf("I'm the parent %d with child %d\n", getpid(), pid);
	} else {
		printf("I'm the child %d\n", getpid());
	}

  return 0;
}