less inaccurate

1 files changed, 12 insertions, 19 deletions

diff --git a/lib/libc/gen/usleep.3 b/lib/libc/gen/usleep.3
index 97cfa2adc6e..b8ff9be759f 100644
--- a/lib/libc/gen/usleep.3
+++ b/lib/libc/gen/usleep.3
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: usleep.3,v 1.2 1996/08/19 08:27:18 tholo Exp $
+.\"	$OpenBSD: usleep.3,v 1.3 1997/04/25 14:47:59 kstailey Exp $
 .\"
 .\" Copyright (c) 1986, 1991, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -52,32 +52,25 @@ of time.
 System activity or time spent in processing the
 call may lengthen the sleep slightly.
 .Pp
-If a timer is already running on the process its state is saved.
-If the value
-.Fa microseconds
-is more than or equal to the remaining clock time for the saved timer,
-the sleep time is set to
-the remaining clock time.
-The state of the previous timer
-is restored after
-.Fa microseconds
-has passed.
-.Pp
 This routine is implemented using 
-.Xr setitimer 2 ;
-it requires eight system calls each time it is invoked.
+.Xr nanosleep 2 ;
+it requires one system call each time it is invoked.
 A similar but less compatible function can be obtained with a single
 .Xr select 2 ;
-such a function would not restart after signals, but would not interfere
+such a function would not restart after signals, and also does not interfere
 with other uses of
-.Xr setitimer .
+.Xr setitimer
+(not that
+.Fn usleep
+interferes with interval timers anymore.)
 .Sh SEE ALSO
-.Xr setitimer 2 ,
 .Xr getitimer 2 ,
+.Xr nanosleep 2 ,
+.Xr setitimer 2 ,
 .Xr sigpause 2 ,
-.Xr ualarm 3 ,
-.Xr sleep 3 ,
 .Xr alarm 3
+.Xr sleep 3 ,
+.Xr ualarm 3 ,
 .Sh HISTORY
 The
 .Fn usleep