Document obsolescence of ualarm.

*** 1,71 ****
- '\" te
  .\"  Copyright (c) 1980 Regents of the University of California.  All rights reserved.  The Berkeley software License Agreement specifies the terms and conditions for redistribution.  Copyright (c) 2002, Sun Microsystems, Inc.  All Rights Reserved  Portions Copyright (c) 1992,
  .\" X/Open Company Limited  All Rights Reserved
  .\" Sun Microsystems, Inc. gratefully acknowledges The Open Group for permission to reproduce portions of its copyrighted documentation. Original documentation from The Open Group can be obtained online at
  .\" http://www.opengroup.org/bookstore/.
  .\" The Institute of Electrical and Electronics Engineers and The Open Group, have given us permission to reprint portions of their documentation. In the following statement, the phrase "this text" refers to portions of the system documentation. Portions of this text are reprinted and reproduced in electronic form in the Sun OS Reference Manual, from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between these versions and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html.
  .\"  This notice shall appear on any product containing this material.
! .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
  the calling process after the number of real-time microseconds specified by the
! \fIuseconds\fR argument has elapsed.  When the \fIinterval\fR 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
  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
  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)
--- 1,86 ----
  .\"  Copyright (c) 1980 Regents of the University of California.  All rights reserved.  The Berkeley software License Agreement specifies the terms and conditions for redistribution.  Copyright (c) 2002, Sun Microsystems, Inc.  All Rights Reserved  Portions Copyright (c) 1992,
  .\" X/Open Company Limited  All Rights Reserved
  .\" Sun Microsystems, Inc. gratefully acknowledges The Open Group for permission to reproduce portions of its copyrighted documentation. Original documentation from The Open Group can be obtained online at
  .\" http://www.opengroup.org/bookstore/.
  .\" The Institute of Electrical and Electronics Engineers and The Open Group, have given us permission to reprint portions of their documentation. In the following statement, the phrase "this text" refers to portions of the system documentation. Portions of this text are reprinted and reproduced in electronic form in the Sun OS Reference Manual, from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between these versions and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html.
  .\"  This notice shall appear on any product containing this material.
! .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
! .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,
! .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.
! .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
! 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 .