POC: Calling fork() from a child process

fork_from_child.c

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

// Sample program to convince myself that you can call fork() from a child process
// Since all processes in UNIX derive from init, this seemed like it would have to
// be true, but just chekcing.
int main() {
	pid_t pid_1;
	pid_t pid_2;

	pid_1 = fork();
	if (pid_1 == -1) {
		perror("fork");
		exit(1);
	}
	else if (pid_1 == 0) {
		puts("Hello from first child");
		pid_2 = fork();
		if (pid_2 == -1) {
			perror("child fork");
			exit(1);
		}
		else if (pid_2 == 0) {
			puts("Hello from second child");
			sleep(2);
			exit(0);
		}
		else {
			puts("Hello from second parent");
			wait(NULL);
			exit(EXIT_SUCCESS);
		}
	}

	else {
		puts("Hello from first parent");
		wait(NULL);
		exit(EXIT_SUCCESS);
	}

	return EXIT_SUCCESS;

}

Compile with: gcc -Wall -pedantic -Werror fork_from_child.c -o fork_example