xnu-3248.20.55.tar.gz

[apple/xnu.git] / bsd / man / man2 / fcntl.2

diff --git a/bsd/man/man2/fcntl.2 b/bsd/man/man2/fcntl.2
index b53a38be18362ae4b64ff1f4972faad6ee107b34..ce2daefe56713ef3ad3606b4d6374536217a42ea 100644 (file)
--- a/bsd/man/man2/fcntl.2
+++ b/bsd/man/man2/fcntl.2
@@ -184,7 +184,10 @@ turns data caching on.
 Get disk device information.
 Currently this only includes the
 disk device address that corresponds
-to the current file offset.
+to the current file offset. Note that if the
+file offset is not backed by physical blocks
+we can return -1 as the offset. This is subject
+to change.
 .It Dv F_LOG2PHYS_EXT
 Variant of F_LOG2PHYS that uses the passed in
 file offset and length.