Document obsolescence of ualarm.

@@ -1,71 +1,86 @@
-'\" te
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-.TH UALARM 3C "Aug 14, 2002"
-.SH NAME
-ualarm \- schedule signal after interval in microseconds
-.SH SYNOPSIS
-.LP
-.nf
-#include <unistd.h>
-
-\fBuseconds_t\fR \fBualarm\fR(\fBuseconds_t\fR \fIuseconds\fR, \fBuseconds_t\fR \fIinterval\fR);
-.fi
-
-.SH DESCRIPTION
-.sp
-.LP
-The \fBualarm()\fR function causes the \fBSIGALRM\fR signal to be generated for
+.Dd "Jul 22, 2014"
+.Dt UALARM 3C
+.Os
+.Sh NAME
+.Nm ualarm
+.Nd schedule signal after interval in microseconds
+.Sh SYNOPSIS
+.In unistd.h
+.Ft useconds_t
+.Fn ualarm "Buseconds_t useconds" "useconds_t interval"
+.Sh DESCRIPTION
+The
+.Fn ualarm
+function causes the
+.Dv SIGALRM
+signal to be generated for
 the calling process after the number of real-time microseconds specified by the
-\fIuseconds\fR argument has elapsed.  When the \fIinterval\fR argument is
+.Fa useconds argument has elapsed.  When the
+.Fa interval
+argument is
 non-zero, repeated timeout notification occurs with a period in microseconds
 specified by the \fIinterval\fR argument. If the notification signal,
-\fBSIGALRM\fR, is not caught or ignored, the calling process is terminated.
-.sp
-.LP
+.Dv SIGALRM ,
+is not caught or ignored, the calling process is terminated.
+.Lp
 Because of scheduling delays, resumption of execution when the signal is caught
 may be delayed an arbitrary amount of time.
-.sp
-.LP
-Interactions between \fBualarm()\fR and either \fBalarm\fR(2) or
-\fBsleep\fR(3C) are unspecified.
-.SH RETURN VALUES
-.sp
-.LP
-The \fBualarm()\fR function returns the number of microseconds remaining from
-the previous \fBualarm()\fR call.  If no timeouts are pending or if
-\fBualarm()\fR has not previously been called, \fBualarm()\fR returns \fB0\fR.
-.SH ERRORS
-.sp
-.LP
+.Lp
+Interactions between
+.Fn ualarm
+and either
+.Xr alarm 2
+or
+.Xr sleep 3C
+are unspecified.
+.Sh RETURN VALUES
+The
+.Fn ualarm
+function returns the number of microseconds remaining from
+the previous
+.Fn ualarm
+call.  If no timeouts are pending or if
+.Fn ualarm
+has not previously been called,
+.Fn ualarm
+returns 0.
+.Sh ERRORS
 No errors are defined.
-.SH USAGE
-.sp
-.LP
-The \fBualarm()\fR function is a simplified interface to \fBsetitimer\fR(2),
-and uses the \fBITIMER_REAL\fR interval timer.
-.SH ATTRIBUTES
-.sp
-.LP
-See \fBattributes\fR(5) for descriptions of the following attributes:
-.sp
-
-.sp
-.TS
-box;
-c | c
-l | l .
-ATTRIBUTE TYPE  ATTRIBUTE VALUE
-_
-Interface Stability     Standard
-.TE
-
-.SH SEE ALSO
-.sp
-.LP
-\fBalarm\fR(2), \fBsetitimer\fR(2), \fBsighold\fR(3C), \fBsignal\fR(3C),
-\fBsleep\fR(3C), \fBusleep\fR(3C), \fBattributes\fR(5), \fBstandards\fR(5)
+.Sh USAGE
+The
+.Fn ualarm
+function is a simplified interface to
+.Xr setitimer 2 ,
+and uses the
+.Dv ITIMER_REAL
+interval timer. It's use has been deprecated in favor of the
+.Xr timer_create 3C
+family of functions.
+.Sh INTERFACE STABILITY
+.Sy Obsolete Standard .
+.Sh SEE ALSO
+.Xr alarm 2 ,
+.Xr setitimer(2),
+.Xr sighold 3C ,
+.Xr signal 3C ,
+.Xr sleep 3C ,
+.Xr timer_create 3C ,
+.Xr usleep 3C ,
+.Xr standards 5
+.Sh STANDARDS
+The
+.Fn ualarm
+function was introduced in
+.Bx 4.3
+and standardized in
+.St -xpg4.2 .
+It was subsequently obsoleted in
+.St -p1003.1-2001
+and removed from
+.St -p1003.1-2008 .