HelenOS sources

VFS_MOUNT_BLOCKING  181 uspace/lib/c/include/ipc/vfs.h 	VFS_MOUNT_BLOCKING = 1,
VFS_MOUNT_BLOCKING  181 uspace/lib/posix/include/libc/ipc/vfs.h 	VFS_MOUNT_BLOCKING = 1,
HelenOS homepage, sources at GitHub