Lots of hacking to make a very simple "ls" utility.

I added a dead-simple malloc that only allows allocations < 4096 bytes.
It just forwards the request to mmap() every time.

I also added simplified versions of opendir() and readdir().

Kernel/Task.h

@@ -101,6 +101,7 @@ public:
     pid_t sys$waitpid(pid_t);
     void* sys$mmap(void*, size_t size);
     int sys$munmap(void*, size_t size);
+    int sys$get_dir_entries(int fd, void*, size_t);
 
     struct
     {
@@ -122,6 +123,8 @@ public:
 
     pid_t waitee() const { return m_waitee; }
 
+    size_t fileHandleCount() const { return m_fileHandles.size(); }
+
 private:
     friend class MemoryManager;