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-/* timespec -- System time interface
-
- Copyright (C) 2000, 2002, 2004-2005, 2007, 2009-2017 Free Software
- Foundation, Inc.
-
- This program is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
-
- This program 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 General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
-
-#if ! defined TIMESPEC_H
-# define TIMESPEC_H
-
-# include <time.h>
-
-#ifndef _GL_INLINE_HEADER_BEGIN
- #error "Please include config.h first."
-#endif
-_GL_INLINE_HEADER_BEGIN
-#ifndef _GL_TIMESPEC_INLINE
-# define _GL_TIMESPEC_INLINE _GL_INLINE
-#endif
-
-/* Resolution of timespec timestamps (in units per second), and log
- base 10 of the resolution. */
-
-enum { TIMESPEC_RESOLUTION = 1000000000 };
-enum { LOG10_TIMESPEC_RESOLUTION = 9 };
-
-/* Return a timespec with seconds S and nanoseconds NS. */
-
-_GL_TIMESPEC_INLINE struct timespec
-make_timespec (time_t s, long int ns)
-{
- struct timespec r;
- r.tv_sec = s;
- r.tv_nsec = ns;
- return r;
-}
-
-/* Return negative, zero, positive if A < B, A == B, A > B, respectively.
-
- For each timestamp T, this code assumes that either:
-
- * T.tv_nsec is in the range 0..999999999; or
- * T.tv_sec corresponds to a valid leap second on a host that supports
- leap seconds, and T.tv_nsec is in the range 1000000000..1999999999; or
- * T.tv_sec is the minimum time_t value and T.tv_nsec is -1; or
- T.tv_sec is the maximum time_t value and T.tv_nsec is 2000000000.
- This allows for special struct timespec values that are less or
- greater than all possible valid timestamps.
-
- In all these cases, it is safe to subtract two tv_nsec values and
- convert the result to integer without worrying about overflow on
- any platform of interest to the GNU project, since all such
- platforms have 32-bit int or wider.
-
- Replacing "(int) (a.tv_nsec - b.tv_nsec)" with something like
- "a.tv_nsec < b.tv_nsec ? -1 : a.tv_nsec > b.tv_nsec" would cause
- this function to work in some cases where the above assumption is
- violated, but not in all cases (e.g., a.tv_sec==1, a.tv_nsec==-2,
- b.tv_sec==0, b.tv_nsec==999999999) and is arguably not worth the
- extra instructions. Using a subtraction has the advantage of
- detecting some invalid cases on platforms that detect integer
- overflow.
-
- The (int) cast avoids a gcc -Wconversion warning. */
-
-_GL_TIMESPEC_INLINE int _GL_ATTRIBUTE_PURE
-timespec_cmp (struct timespec a, struct timespec b)
-{
- return (a.tv_sec < b.tv_sec ? -1
- : a.tv_sec > b.tv_sec ? 1
- : (int) (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_PURE
-timespec_sign (struct timespec a)
-{
- return a.tv_sec < 0 ? -1 : a.tv_sec || a.tv_nsec;
-}
-
-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;
-}
-
-void gettime (struct timespec *);
-int settime (struct timespec const *);
-
-_GL_INLINE_HEADER_END
-
-#endif