Add manpage for timeradd macros and friends. A companion page for

timespecadd should be added at a future point...

PR:		13079

share/man/man3/Makefile

@@ -2,7 +2,7 @@
 # $FreeBSD$
 
 MAN=	assert.3 bitstring.3 end.3 fpgetround.3 intro.3 pthread.3 queue.3 \
-	stdarg.3 sysexits.3
+	stdarg.3 sysexits.3 timeradd.3
 MLINKS+=bitstring.3 bit_alloc.3 bitstring.3 bit_clear.3 \
 	bitstring.3 bit_decl.3 bitstring.3 bit_ffc.3 bitstring.3 bit_ffs.3 \
 	bitstring.3 bit_nclear.3 bitstring.3 bit_nset.3 bitstring.3 bit_set.3 \
@@ -71,4 +71,6 @@ MLINKS+=queue.3 TAILQ_REMOVE.3
 MLINKS+=stdarg.3 varargs.3 stdarg.3 va_arg.3 stdarg.3 va_end.3
 MLINKS+=stdarg.3 va_start.3
 
+MLINKS+=timeradd.3 timersub.3 timerclear.3 timerisset.3 timercmp.3
+
 .include <bsd.prog.mk>

share/man/man3/timeradd.3

@@ -0,0 +1,121 @@
+.\" Copyright (c) 1999 Kelly Yancey <kbyanc@posi.net>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. Neither the name of the author nor the names of any co-contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     $FreeBSD$
+.\"
+.Dd Aug 11, 1999
+.Dt TIMERADD 3
+.Os BSD 4
+.Sh NAME
+.Nm timeradd ,
+.Nm timersub ,
+.Nm timerclear ,
+.Nm timerisset ,
+.Nm timercmp
+.Nd operations on timevals
+.Sh SYNOPSIS
+.Fd #include <sys/time.h>
+.Fn timeradd "&tvp" "&uvp" "&vvp"
+.Fn timersub "&tvp" "&uvp" "&vvp"
+.Fn timerclear "&tvp"
+.Fn timerisset "&tvp"
+.Fn timercmp "&tvp" "&uvp" "cmp"
+.Sh DESCRIPTION
+.Pp
+These macros are provided for manipulating
+.Fa timeval
+structures for use with the
+.Fn gettimeofday
+and
+.Fn settimeofday
+calls.
+The structures pointed to by
+.Fa tvp ,
+.Fa uvp ,
+and
+.Fa vvp
+are defined in 
+.Ao Pa sys/time.h Ac
+as:
+.Pp
+.Bd -literal
+struct timeval {
+	long	tv_sec;		/* seconds since Jan. 1, 1970 */
+	long	tv_usec;	/* and microseconds */
+};
+.Ed
+.Pp
+.Fn timeradd
+adds the time information stored in
+.Fa uvp
+to
+.Fa tvp
+and stores the resulting
+.Fa timeval
+in
+.Fa vvp .
+The results are simplified such that the value of
+.Fa vvp->tv_usec
+is always less than 1,000,000 (1 second).
+.Pp
+.Fn timersub
+subtracts the time information stored in
+.Fa uvp
+from
+.Fa tvp
+and stores the resulting
+.Fa timeval
+in
+.Fa vvp .
+.Pp
+.Fn timerclear
+initializes
+.Fa tvp
+to midnight (0 hour) January 1st, 1970 (the Epoch).
+.Pp
+.Fn timerisset
+returns true if
+.Fa tvp
+is set to any time value other than the Epoch.
+.Pp
+.Fn timercmp
+compares
+.Fa tvp
+to
+.Fa uvp
+using the comparison operator given in
+.Fa cmp
+and returns the result of that comparison.
+.Sh SEE ALSO
+.Xr gettimeofday 2 
+.Sh HISTORY
+The
+.Fn timeradd
+family of macros were imported from
+.Nx 1.1 ,
+and appeared in
+.Fx 2.2.6 .