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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 16:11:47 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 16:11:47 +0000 |
commit | 758f820bcc0f68aeebac1717e537ca13a320b909 (patch) | |
tree | 48111ece75cf4f98316848b37a7e26356e00669e /lib/timespec.h | |
parent | Initial commit. (diff) | |
download | coreutils-upstream.tar.xz coreutils-upstream.zip |
Adding upstream version 9.1.upstream/9.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'lib/timespec.h')
-rw-r--r-- | lib/timespec.h | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/lib/timespec.h b/lib/timespec.h new file mode 100644 index 0000000..9e35828 --- /dev/null +++ b/lib/timespec.h @@ -0,0 +1,102 @@ +/* timespec -- System time interface + + Copyright (C) 2000, 2002, 2004-2005, 2007, 2009-2022 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 + +#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 + +#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) +{ + 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. */ + +_GL_TIMESPEC_INLINE int _GL_ATTRIBUTE_PURE +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_PURE +timespec_sign (struct timespec a) +{ + return _GL_CMP (a.tv_sec, 0) + (!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; +} + +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 |