Kernel/LibC: Implement basic epoll

This implementation is on top of inodes instead of fds as linux does it.
If I start finding ports/software that relies on epoll allowing
duplicate inodes, I will do what linux does.

I'm probably missing multiple epoll_notify's which may cause hangs but
the system seems to work fine :dd:

kernel/include/kernel/Process.h

@@ -24,6 +24,8 @@
 #include <sys/time.h>
 #include <termios.h>
 
+struct epoll_event;
+
 namespace Kernel
 {
 
@@ -130,6 +132,10 @@ namespace Kernel
 
 		BAN::ErrorOr<long> sys_pselect(sys_pselect_t* arguments);
 
+		BAN::ErrorOr<long> sys_epoll_create1(int flags);
+		BAN::ErrorOr<long> sys_epoll_ctl(int epfd, int op, int fd, struct epoll_event* event);
+		BAN::ErrorOr<long> sys_epoll_pwait2(int epfd, struct epoll_event* events, int maxevents, const struct timespec* timeout, const sigset_t* sigmask);
+
 		BAN::ErrorOr<long> sys_pipe(int fildes[2]);
 		BAN::ErrorOr<long> sys_dup2(int fildes, int fildes2);