lock.c

#include <dlfcn.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>

int	main(void)
{
	char	*name;
	void	*handle;
	char	*lib = "/System/Library/PrivateFrameworks/login.framework/Versions/A/login";
	char	*logout = "SACLOStartLogout";
	char	*turn = "SACSwitchToLoginWindow";
	void	(*func)(int, int, int, int);

	if (!(name = calloc(1024, sizeof(char *))))
		return (-1);
	if (gethostname(name, 1024) == -1)
		return (-1);
	if (!(handle = dlopen(lib, RTLD_LAZY)))
		return (-1);
	if (!func = dlsym(handle, strstr(name, "1337.ma") ? logout : turn))
		return (-1);
	func(1, 1, 0, 0);
}