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/* systime.h - System-dependent definitions for time manipulations.
Copyright (C) 1993-1994, 2002-2011 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 <http://www.gnu.org/licenses/>. */
#ifndef EMACS_SYSTIME_H
#define EMACS_SYSTIME_H
#ifdef TIME_WITH_SYS_TIME
#include <sys/time.h>
#include <time.h>
#else
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#else
#include <time.h>
#endif
#endif
#ifdef HAVE_TZNAME
#ifndef tzname /* For SGI. */
extern char *tzname[]; /* RS6000 and others want it this way. */
#endif
#endif
/* SVr4 doesn't actually declare this in its #include files. */
#ifdef USG5_4
extern time_t timezone;
#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
/* EMACS_TIME is the type to use to represent temporal intervals -
struct timeval on some systems, int on others. It can be passed as
the timeout argument to the select system call.
EMACS_SECS (TIME) is an rvalue for the seconds component of TIME.
EMACS_SET_SECS (TIME, SECONDS) sets that to SECONDS.
EMACS_HAS_USECS is defined if EMACS_TIME has a usecs component.
EMACS_USECS (TIME) is an rvalue for the microseconds component of TIME.
This returns zero if EMACS_TIME doesn't have a microseconds component.
EMACS_SET_USECS (TIME, MICROSECONDS) sets that to MICROSECONDS.
This does nothing if EMACS_TIME doesn't have a microseconds component.
EMACS_SET_SECS_USECS (TIME, SECS, USECS) sets both components of TIME.
EMACS_GET_TIME (TIME) stores the current system time in TIME, which
should be an lvalue.
EMACS_ADD_TIME (DEST, SRC1, SRC2) adds SRC1 to SRC2 and stores the
result in DEST. SRC should not be negative.
EMACS_SUB_TIME (DEST, SRC1, SRC2) subtracts SRC2 from SRC1 and
stores the result in DEST. SRC should not be negative.
EMACS_TIME_NEG_P (TIME) is true if TIME is negative.
*/
#ifdef HAVE_TIMEVAL
#define EMACS_HAS_USECS
#define EMACS_TIME struct timeval
#define EMACS_SECS(time) ((time).tv_sec + 0)
#define EMACS_USECS(time) ((time).tv_usec + 0)
#define EMACS_SET_SECS(time, seconds) ((time).tv_sec = (seconds))
#define EMACS_SET_USECS(time, microseconds) ((time).tv_usec = (microseconds))
/* On SVR4, the compiler may complain if given this extra BSD arg. */
#ifdef GETTIMEOFDAY_ONE_ARGUMENT
#define EMACS_GET_TIME(time) gettimeofday (&(time))
#else /* not GETTIMEOFDAY_ONE_ARGUMENT */
/* Presumably the second arg is ignored. */
#define EMACS_GET_TIME(time) gettimeofday (&(time), NULL)
#endif /* not GETTIMEOFDAY_ONE_ARGUMENT */
#define EMACS_ADD_TIME(dest, src1, src2) \
do { \
(dest).tv_sec = (src1).tv_sec + (src2).tv_sec; \
(dest).tv_usec = (src1).tv_usec + (src2).tv_usec; \
if ((dest).tv_usec > 1000000) \
(dest).tv_usec -= 1000000, (dest).tv_sec++; \
} while (0)
#define EMACS_SUB_TIME(dest, src1, src2) \
do { \
(dest).tv_sec = (src1).tv_sec - (src2).tv_sec; \
(dest).tv_usec = (src1).tv_usec - (src2).tv_usec; \
if ((dest).tv_usec < 0) \
(dest).tv_usec += 1000000, (dest).tv_sec--; \
} while (0)
#define EMACS_TIME_NEG_P(time) \
((long)(time).tv_sec < 0 \
|| ((time).tv_sec == 0 \
&& (long)(time).tv_usec < 0))
#else /* ! defined (HAVE_TIMEVAL) */
#define EMACS_TIME int
#define EMACS_SECS(time) (time)
#define EMACS_USECS(time) 0
#define EMACS_SET_SECS(time, seconds) ((time) = (seconds))
#define EMACS_SET_USECS(time, usecs) 0
#define EMACS_GET_TIME(t) ((t) = time ((long *) 0))
#define EMACS_ADD_TIME(dest, src1, src2) ((dest) = (src1) + (src2))
#define EMACS_SUB_TIME(dest, src1, src2) ((dest) = (src1) - (src2))
#define EMACS_TIME_NEG_P(t) ((t) < 0)
#endif /* ! defined (HAVE_TIMEVAL) */
#define EMACS_SET_SECS_USECS(time, secs, usecs) \
(EMACS_SET_SECS (time, secs), EMACS_SET_USECS (time, usecs))
extern int set_file_times (const char *, EMACS_TIME, EMACS_TIME);
/* defined in keyboard.c */
extern void set_waiting_for_input (EMACS_TIME *);
/* When lisp.h is not included Lisp_Object is not defined (this can
happen when this files is used outside the src directory).
Use GCPRO1 to determine if lisp.h was included. */
#ifdef GCPRO1
/* defined in dired.c */
extern Lisp_Object make_time (time_t);
/* defined in editfns.c*/
extern int lisp_time_argument (Lisp_Object, time_t *, int *);
#endif
/* Compare times T1 and T2. Value is 0 if T1 and T2 are the same.
Value is < 0 if T1 is less than T2. Value is > 0 otherwise. (Cast
to long is for those platforms where time_t is an unsigned
type, and where otherwise T1 will always be grater than T2.) */
#define EMACS_TIME_CMP(T1, T2) \
((long)EMACS_SECS (T1) - (long)EMACS_SECS (T2) \
+ (EMACS_SECS (T1) == EMACS_SECS (T2) \
? EMACS_USECS (T1) - EMACS_USECS (T2) \
: 0))
/* Compare times T1 and T2 for equality, inequality etc. */
#define EMACS_TIME_EQ(T1, T2) (EMACS_TIME_CMP (T1, T2) == 0)
#define EMACS_TIME_NE(T1, T2) (EMACS_TIME_CMP (T1, T2) != 0)
#define EMACS_TIME_GT(T1, T2) (EMACS_TIME_CMP (T1, T2) > 0)
#define EMACS_TIME_GE(T1, T2) (EMACS_TIME_CMP (T1, T2) >= 0)
#define EMACS_TIME_LT(T1, T2) (EMACS_TIME_CMP (T1, T2) < 0)
#define EMACS_TIME_LE(T1, T2) (EMACS_TIME_CMP (T1, T2) <= 0)
#endif /* EMACS_SYSTIME_H */
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