/* timespec -- System time interface

   Copyright (C) 2000, 2002, 2004-2005, 2007, 2009-2026 Free Software

   Foundation, Inc.

   This file is free software: you can redistribute it and/or modify

   it under the terms of the GNU Lesser General Public License as

   published by the Free Software Foundation, either version 3 of the

   License, or (at your option) any later version.

   This file 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 Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License

   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */

#if ! defined TIMESPEC_H

#define TIMESPEC_H

/* This file uses _GL_INLINE_HEADER_BEGIN, _GL_INLINE, _GL_ATTRIBUTE_CONST,

   _GL_CMP.  */

#if !_GL_CONFIG_H_INCLUDED

 #error "Please include config.h first."

#endif

#include <time.h>

_GL_INLINE_HEADER_BEGIN

#ifndef _GL_TIMESPEC_INLINE

# define _GL_TIMESPEC_INLINE _GL_INLINE

#endif

#ifdef __cplusplus

extern "C" {

#endif

#include "arg-nonnull.h"

/* Inverse resolution of timespec timestamps (in units per second),

   and log base 10 of the inverse resolution.  */

enum { TIMESPEC_HZ = 1000000000 };

enum { LOG10_TIMESPEC_HZ = 9 };

/* Obsolescent names for backward compatibility.

   They are misnomers, because TIMESPEC_RESOLUTION is not a resolution.  */

enum { TIMESPEC_RESOLUTION = TIMESPEC_HZ };

enum { LOG10_TIMESPEC_RESOLUTION = LOG10_TIMESPEC_HZ };

/* Return a timespec with seconds S and nanoseconds NS.  */

_GL_TIMESPEC_INLINE struct timespec

make_timespec (time_t s, long int ns)

{

  return (struct timespec) { .tv_sec = s, .tv_nsec = ns };

}

/* Return negative, zero, positive if A < B, A == B, A > B, respectively.  */

_GL_TIMESPEC_INLINE int _GL_ATTRIBUTE_CONST

timespec_cmp (struct timespec a, struct timespec b)

{

  return 2 * _GL_CMP (a.tv_sec, b.tv_sec) + _GL_CMP (a.tv_nsec, b.tv_nsec);

}

/* Return -1, 0, 1, depending on the sign of A.  A.tv_nsec must be

   nonnegative.  */

_GL_TIMESPEC_INLINE int _GL_ATTRIBUTE_CONST

timespec_sign (struct timespec a)

{

  return _GL_CMP (a.tv_sec | a.tv_nsec, 0);

}

struct timespec timespec_add (struct timespec, struct timespec)

  _GL_ATTRIBUTE_CONST;

struct timespec timespec_sub (struct timespec, struct timespec)

  _GL_ATTRIBUTE_CONST;

struct timespec dtotimespec (double)

  _GL_ATTRIBUTE_CONST;

/* Return an approximation to A, of type 'double'.  */

_GL_TIMESPEC_INLINE double

timespectod (struct timespec a)

{

  return a.tv_sec + a.tv_nsec / 1e9;

}

long int gettime_res (void);

struct timespec current_timespec (void);

void gettime (struct timespec *) _GL_ARG_NONNULL ((1));

int settime (struct timespec const *) _GL_ARG_NONNULL ((1));

#ifdef __cplusplus

}

#endif

_GL_INLINE_HEADER_END

#endif