Finally hook up the mkdir code to a syscall.

Added a /bin/mkdir that makes directories. How very neat :^)
There are various limitations because of missing functionality.

LibC/errno_numbers.h

@@ -41,6 +41,7 @@
     __ERROR(ENOSYS,         "No such syscall") \
     __ERROR(ENOTIMPL,       "Not implemented") \
     __ERROR(EAFNOSUPPORT,   "Address family not supported") \
+    __ERROR(EWHYTHO,        "Failed without setting an error code (Bug!)") \
 
 enum __errno_values {
 #undef __ERROR

LibC/stat.cpp

@@ -1,4 +1,5 @@
 #include <sys/stat.h>
+#include <errno.h>
 #include <Kernel/Syscall.h>
 
 extern "C" {
@@ -8,5 +9,11 @@ mode_t umask(mode_t mask)
     return Syscall::invoke(Syscall::SC_umask, (dword)mask);
 }
 
+int mkdir(const char* pathname, mode_t mode)
+{
+    int rc = Syscall::invoke(Syscall::SC_mkdir, (dword)pathname, (dword)mode);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
 }
 

LibC/sys/stat.h

@@ -7,5 +7,6 @@ __BEGIN_DECLS
 
 mode_t umask(mode_t);
 int chmod(const char* pathname, mode_t);
+int mkdir(const char* pathname, mode_t);
 
 __END_DECLS