diff options
| -rw-r--r-- | lib/libc/gen/sleep.3 | 25 |
1 files changed, 9 insertions, 16 deletions
diff --git a/lib/libc/gen/sleep.3 b/lib/libc/gen/sleep.3 index 21cdc5773ed..23a9f0bfb25 100644 --- a/lib/libc/gen/sleep.3 +++ b/lib/libc/gen/sleep.3 @@ -1,4 +1,4 @@ -.\" $OpenBSD: sleep.3,v 1.2 1996/08/19 08:26:18 tholo Exp $ +.\" $OpenBSD: sleep.3,v 1.3 1997/04/25 14:39:00 kstailey Exp $ .\" .\" Copyright (c) 1986, 1991, 1993 .\" The Regents of the University of California. All rights reserved. @@ -52,25 +52,17 @@ action is to invoke a signal-catching function or to terminate the process. The suspension time may be longer than requested due to the scheduling of other activity by the system. .Pp -If a timer is already running on the process its state is saved. -If the value -.Fa seconds -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 seconds -has passed. -.Pp This function 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 sleep +interferes with interval timers anymore.) .Sh RETURN VALUE If the .Fn sleep @@ -81,6 +73,7 @@ function returns due to the delivery of a signal, the value returned will be the unslept amount (the request time minus the time actually slept) in seconds. .Sh SEE ALSO +.Xr nanosleep 2 , .Xr setitimer 2 , .Xr sigaction 2 , .Xr sigsuspend 2 , |