linux 2.6.16.38 w/ vs2.0.3-rc1

[linux-2.6.git] / Documentation / tty.txt

diff --git a/Documentation/tty.txt b/Documentation/tty.txt
index dab5660..8ff7bc2 100644 (file)
--- a/Documentation/tty.txt
+++ b/Documentation/tty.txt
@@ -80,6 +80,13 @@ receive_buf()        -       Hand buffers of bytes from the driver to the ldisc
                        for processing. Semantics currently rather
                        mysterious 8(
 
+receive_room() -       Can be called by the driver layer at any time when
+                       the ldisc is opened. The ldisc must be able to
+                       handle the reported amount of data at that instant.
+                       Synchronization between active receive_buf and
+                       receive_room calls is down to the driver not the
+                       ldisc. Must not sleep.
+
 write_wakeup() -       May be called at any point between open and close.
                        The TTY_DO_WRITE_WAKEUP flag indicates if a call
                        is needed but always races versus calls. Thus the