HelenOS sources

WALK_MUST_CREATE  170 uspace/lib/c/include/ipc/vfs.h 	WALK_MUST_CREATE = (1 << 1),
WALK_MUST_CREATE  170 uspace/lib/posix/include/libc/ipc/vfs.h 	WALK_MUST_CREATE = (1 << 1),
HelenOS homepage, sources at GitHub