BSD 4_2 development

Work on file usr/man/man3/sleep.3

Synthesized-from: CSRG/cd1/4.2

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+.TH SLEEP 3  "19 January 1983"
+.UC 4
+.SH NAME
+sleep \- suspend execution for interval
+.SH SYNOPSIS
+.nf
+.B sleep(seconds)
+.B unsigned seconds;
+.fi
+.SH DESCRIPTION
+The current process is suspended from execution for the number
+of seconds specified by the argument.
+The actual suspension time may be up to 1 second less than
+that requested, because scheduled wakeups occur at fixed 1-second intervals,
+and an arbitrary amount longer because of other activity
+in the system.
+.PP
+The routine is implemented by setting an interval timer
+and pausing until it occurs.
+The previous state of this timer is saved and restored.
+If the sleep time exceeds the time to the expiration of the
+previous timer,
+the process sleeps only until the signal would have occurred, and the
+signal is sent 1 second later.
+.SH "SEE ALSO"
+setitimer(2), sigpause(2)
+.SH BUGS
+An interface with finer resolution is needed.