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| | /* systime.h - System-dependent definitions for time manipulations.
Copyright (C) 1993-1994, 2002-2019 Free Software Foundation, Inc.
This file is part of GNU Emacs.
GNU Emacs 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.
GNU Emacs 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 GNU Emacs. If not, see <https://www.gnu.org/licenses/>. */
#ifndef EMACS_SYSTIME_H
#define EMACS_SYSTIME_H
#include "lisp.h"
#include <timespec.h>
INLINE_HEADER_BEGIN
#ifdef HAVE_X_WINDOWS
# include <X11/X.h>
#else
typedef unsigned long Time;
#endif
/* On some configurations (hpux8.0, X11R4), sys/time.h and X11/Xos.h
disagree about the name of the guard symbol. */
#ifdef HPUX
#ifdef _STRUCT_TIMEVAL
#ifndef __TIMEVAL__
#define __TIMEVAL__
#endif
#endif
#endif
#include <sys/time.h> /* for 'struct timeval' */
\f
/* Emacs uses struct timespec to represent nonnegative temporal intervals.
WARNING: Since tv_sec might be an unsigned value, do not use struct
timespec as a general-purpose data type for adding or subtracting
arbitrary time values! When computing A + B or A - B, typically A
should be an absolute time since the epoch and B a nonnegative offset. */
/* Return an invalid timespec. */
INLINE struct timespec
invalid_timespec (void)
{
return make_timespec (0, -1);
}
/* Return true if TIME is a valid timespec. This currently doesn't worry
about whether tv_nsec is less than TIMESPEC_HZ; leap seconds might
cause a problem if it did. */
INLINE bool
timespec_valid_p (struct timespec t)
{
return t.tv_nsec >= 0;
}
/* defined in sysdep.c */
extern int set_file_times (int, const char *, struct timespec, struct timespec);
/* defined in keyboard.c */
extern void set_waiting_for_input (struct timespec *);
/* Emacs uses the integer list (HI LO US PS) to represent the time
(HI << LO_TIME_BITS) + LO + US / 1e6 + PS / 1e12. */
enum { LO_TIME_BITS = 16 };
/* Components of a new-format Lisp timestamp. */
struct lisp_time
{
/* Clock count as a Lisp integer. */
Lisp_Object ticks;
/* Clock frequency (ticks per second) as a positive Lisp integer.
(TICKS . HZ) is a valid Lisp timestamp unless HZ < 65536. */
Lisp_Object hz;
};
/* defined in timefns.c */
extern struct timeval make_timeval (struct timespec) ATTRIBUTE_CONST;
extern Lisp_Object make_lisp_time (struct timespec);
extern bool list4_to_timespec (Lisp_Object, Lisp_Object, Lisp_Object,
Lisp_Object, struct timespec *);
extern struct timespec lisp_time_argument (Lisp_Object);
extern AVOID time_overflow (void);
extern void init_timefns (void);
extern void syms_of_timefns (void);
INLINE_HEADER_END
#endif /* EMACS_SYSTIME_H */
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