xv6-riscv-rust/user/zombie.c

// Create a zombie process that
// must be reparented at exit.

#include "kernel/types.h"
#include "kernel/stat.h"
#include "user/user.h"

int main(void) {
	if (fork() > 0)
		sleep(5); // Let child exit before parent.
	exit(0);
}