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/* realtime objects and functions, for libreswan
*
* Copyright (C) 1998, 1999, 2000 Henry Spencer.
* Copyright (C) 1999, 2000, 2001 Richard Guy Briggs
* Copyright (C) 2017, 2018 Andrew Cagney
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Library General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <https://www.gnu.org/licenses/lgpl-2.1.txt>.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
* License for more details.
*
*/
#ifndef REALTIME_H
#define REALTIME_H /* seen it, no need to see it again */
#include <sys/time.h> /* for struct timeval */
#include <time.h> /* for time_t and struct tm */
#include <stdbool.h> /* for bool */
#include "deltatime.h" /* for deltatime_t */
struct jambuf;
/*
* The time objects are wrapped so that dimensional analysis will be
* enforced by the compiler.
*/
/*
* realtime_t: absolute UTC time. Might be discontinuous due to clock
* adjustment.
*
* Use struct timeval as that has the supporting macros timeradd(3)
* et.al. for performing arithmetic.
*
* According to the gettimeofday(2) man mage, struct timespec and
* clock_gettime(2) are, techncially, a far better choice but they
* lack pre-defined operators.
*/
typedef struct { struct timeval rt; } realtime_t;
#define REALTIME_EPOCH {{ 0, 0, }}
extern const realtime_t realtime_epoch;
realtime_t realtime(time_t seconds);
diag_t ttorealtime(const char *time, realtime_t *rt);
/*
* Formatting.
*/
typedef struct {
char buf[sizeof("--- -- --:--:-- UTC ----")+1/*canary*/];
} realtime_buf;
const char *str_realtime(realtime_t r, bool utc, realtime_buf *buf);
size_t jam_realtime(struct jambuf *buf, realtime_t r, bool utc);
/*
* math
*/
bool is_realtime_epoch(realtime_t t);
realtime_t realtime_add(realtime_t r, deltatime_t d);
realtime_t realtime_sub(realtime_t r, deltatime_t d);
deltatime_t realtime_diff(realtime_t l, realtime_t r);
/* sign(a - b); see timercmp() for hacks origin */
int realtime_sub_sign(realtime_t l, realtime_t r);
#define realtime_cmp(L, OP, R) (realtime_sub_sign(L, R) OP 0)
realtime_t realnow(void);
struct realtm {
struct tm tm;
long microsec; /* 1 000 000 per second */
};
struct realtm local_realtime(realtime_t t);
struct realtm utc_realtime(realtime_t t);
/* for pthread_cond_timedwait() */
clockid_t realtime_clockid(void);
#endif
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