1 .\" Copyright (c) 1999 Kelly Yancey <kbyanc@posi.net>
2 .\" All rights reserved.
4 .\" Redistribution and use in source and binary forms, with or without
5 .\" modification, are permitted provided that the following conditions
7 .\" 1. Redistributions of source code must retain the above copyright
8 .\" notice, this list of conditions and the following disclaimer.
9 .\" 2. Redistributions in binary form must reproduce the above copyright
10 .\" notice, this list of conditions and the following disclaimer in the
11 .\" documentation and/or other materials provided with the distribution.
12 .\" 3. Neither the name of the author nor the names of any co-contributors
13 .\" may be used to endorse or promote products derived from this software
14 .\" without specific prior written permission.
16 .\" THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
17 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
20 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
42 .Nd operations on timevals and timespecs
46 .Fn timeradd "struct timeval *a" "struct timeval *b" "struct timeval *res"
48 .Fn timersub "struct timeval *a" "struct timeval *b" "struct timeval *res"
50 .Fn timerclear "struct timeval *tvp"
52 .Fn timerisset "struct timeval *tvp"
54 .Fn timercmp "struct timeval *a" "struct timeval *b" CMP
56 .Fn timespecadd "struct timespec *a" "struct timespec *b" "struct timespec *res"
58 .Fn timespecsub "struct timespec *a" "struct timespec *b" "struct timespec *res"
60 .Fn timespecclear "struct timespec *ts"
62 .Fn timespecisset "struct timespec *ts"
64 .Fn timespeccmp "struct timespec *a" "struct timespec *b" CMP
66 These macros are provided for manipulating
70 structures for use with the
79 structure is defined in
84 long tv_sec; /* seconds since Jan. 1, 1970 */
85 long tv_usec; /* and microseconds */
90 structure is defined in
95 time_t tv_sec; /* seconds */
96 long tv_nsec; /* and nanoseconds */
103 add the time information stored in
107 and store the result in
109 The results are simplified such that the value of
113 is always less than 1 second.
118 subtract the time information stored in
129 initialize their argument to midnight (0 hour) January 1st, 1970 (the Epoch).
134 return true if their argument is set to any time value other than the Epoch.
143 using the comparison operator given in
145 and return the result of that comparison.
147 .Xr clock_gettime 2 ,
152 family of macros were imported from
158 family of macros were imported from
162 though they were not exposed to userland until