HelenOS sources

WALK_MOUNT_POINT  174 uspace/lib/c/include/ipc/vfs.h 	WALK_MOUNT_POINT = (1 << 4),
WALK_MOUNT_POINT  174 uspace/lib/posix/include/libc/ipc/vfs.h 	WALK_MOUNT_POINT = (1 << 4),
HelenOS homepage, sources at GitHub