bleh

lib/libc/sys/open.2

@@ -30,7 +30,7 @@
 .\" SUCH DAMAGE.
 .\"
 .\"     from: @(#)open.2	6.7 (Berkeley) 5/27/91
-.\"	$Id: open.2,v 1.5 1993/12/15 17:36:59 jtc Exp $
+.\"	$Id: open.2,v 1.6 1994/04/11 06:36:04 glass Exp $
 .\"
 .Dd May 27, 1991
 .Dt OPEN 2
@@ -70,7 +70,7 @@ the following values
 O_RDONLY	open for reading only
 O_WRONLY	open for writing only
 O_RDWR		open for reading and writing
-O_NONBLOCK	do not block on open
+O_NONBLOCK	do not block on open or for data to become available
 O_APPEND	append on each write
 O_CREAT		create file if it does not exist
 O_TRUNC		truncate size to 0
@@ -104,15 +104,15 @@ will fail even if the symbolic
 link points to a non-existent name.
 If the
 .Dv O_NONBLOCK
-flag is specified and the
+flag is specified, do not wait for the device or file to be ready or
+available.  If the
 .Fn open
 call would result
 in the process being blocked for some reason (e.g., waiting for
 carrier on a dialup line),
 .Fn open
 returns immediately.
-The first time the process attempts to perform I/O on the open
-file it will block (not currently implemented).
+This flag also has the effect of making all subsequent I/O on the open file non-blocking.
 .Pp
 When opening a file, a lock with
 .Xr flock 2