1 /* 2 * Copyright (c) 1982, 1986 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)time.h 7.6 (Berkeley) 2/22/91 34 */ 35 36 /* messed about with substantially by @feilipu October 2019 */ 37 38 #ifndef _SYS_TIME_H_ 39 #define _SYS_TIME_H_ 40 41 #include <sys/types.h> 42 43 #ifdef __cplusplus 44 extern "C" { 45 #endif 46 47 /* 48 * Structure returned by clock_gettime() system call 49 * and used in other calls. 50 */ 51 52 struct timespec { 53 time_t tv_sec; /* seconds */ 54 nseconds_t tv_nsec; /* and nanoseconds */ 55 }; 56 57 enum clock_id { 58 CLOCK_REALTIME, 59 CLOCK_MONOTONIC, 60 CLOCK_PROCESS_CPUTIME_ID, 61 CLOCK_THREAD_CPUTIME_ID, 62 CLOCK_MONOTONIC_RAW, 63 CLOCK_REALTIME_COARSE, 64 CLOCK_MONOTONIC_COARSE 65 }; 66 67 /* 68 * Convenience macros for operations on timevals 69 * NOTE: `timercmp' does not work for >= or <= 70 */ 71 72 #define timerisset(tvp) ((tvp)->tv_sec || (tvp)->tv_nsec) 73 #define timerclear(tvp) ((tvp)->tv_sec = (tvp)->tv_nsec = 0) 74 #define timercmp(a, b, CMP) \ 75 (((a)->tv_sec == (b)->tv_sec) ? \ 76 ((a)->tv_nsec CMP (b)->tv_nsec) : \ 77 ((a)->tv_sec CMP (b)->tv_sec)) 78 #define timeradd(a, b, result) \ 79 do { \ 80 (result)->tv_sec = (a)->tv_sec + (b)->tv_sec; \ 81 (result)->tv_nsec = (a)->tv_nsec + (b)->tv_nsec; \ 82 if ((result)->tv_nsec >= 1000000000) \ 83 { \ 84 ++(result)->tv_sec; \ 85 (result)->tv_nsec -= 1000000000; \ 86 } \ 87 } while (0) 88 #define timersub(a, b, result) \ 89 do { \ 90 (result)->tv_sec = (a)->tv_sec - (b)->tv_sec; \ 91 (result)->tv_nsec = (a)->tv_nsec - (b)->tv_nsec; \ 92 if ((a)->tv_nsec < ((b)->tv_nsec) { \ 93 --(result)->tv_sec; \ 94 (result)->tv_nsec += 1000000000; \ 95 } \ 96 } while (0) 97 98 99 #ifdef __cplusplus 100 } 101 #endif 102 #endif /* !_SYS_TIME_H_ */ 103