mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2025-01-21 18:23:59 +00:00
634d0a907f
This incorporates: 2017-05-01 New module 'localtime-buffer' 2017-04-30 utimens: Add support for native Windows * admin/merge-gnulib (AVOIDED_MODULES): Add tzset. * configure.ac (tzset): No need for Emacs itself to check now. * lib/gettimeofday.c, lib/time.in.h, lib/time_rz.c, lib/utimens.c: * m4/gettimeofday.m4, m4/time_h.m4, m4/time_rz.m4: Copy from gnulib. * lib/gnulib.mk.in, m4/gnulib-comp.m4: Regenerate. * lib/localtime-buffer.c, lib/localtime-buffer.h: * m4/localtime-buffer.m4: New files, copied from gnulib. * src/editfns.c (init_editfns): Assume tzset is callable.
140 lines
4.2 KiB
C
140 lines
4.2 KiB
C
/* Provide gettimeofday for systems that don't have it or for which it's broken.
|
|
|
|
Copyright (C) 2001-2003, 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, 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/>. */
|
|
|
|
/* written by Jim Meyering */
|
|
|
|
#include <config.h>
|
|
|
|
/* Specification. */
|
|
#include <sys/time.h>
|
|
|
|
#include <time.h>
|
|
|
|
#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
|
|
# define WINDOWS_NATIVE
|
|
# include <windows.h>
|
|
#endif
|
|
|
|
#include "localtime-buffer.h"
|
|
|
|
#ifdef WINDOWS_NATIVE
|
|
|
|
/* GetSystemTimePreciseAsFileTime was introduced only in Windows 8. */
|
|
typedef void (WINAPI * GetSystemTimePreciseAsFileTimeFuncType) (FILETIME *lpTime);
|
|
static GetSystemTimePreciseAsFileTimeFuncType GetSystemTimePreciseAsFileTimeFunc = NULL;
|
|
static BOOL initialized = FALSE;
|
|
|
|
static void
|
|
initialize (void)
|
|
{
|
|
HMODULE kernel32 = LoadLibrary ("kernel32.dll");
|
|
if (kernel32 != NULL)
|
|
{
|
|
GetSystemTimePreciseAsFileTimeFunc =
|
|
(GetSystemTimePreciseAsFileTimeFuncType) GetProcAddress (kernel32, "GetSystemTimePreciseAsFileTime");
|
|
}
|
|
initialized = TRUE;
|
|
}
|
|
|
|
#endif
|
|
|
|
/* This is a wrapper for gettimeofday. It is used only on systems
|
|
that lack this function, or whose implementation of this function
|
|
causes problems.
|
|
Work around the bug in some systems whereby gettimeofday clobbers
|
|
the static buffer that localtime uses for its return value. The
|
|
gettimeofday function from Mac OS X 10.0.4 (i.e., Darwin 1.3.7) has
|
|
this problem. */
|
|
|
|
int
|
|
gettimeofday (struct timeval *restrict tv, void *restrict tz)
|
|
{
|
|
#undef gettimeofday
|
|
#if HAVE_GETTIMEOFDAY
|
|
# if GETTIMEOFDAY_CLOBBERS_LOCALTIME
|
|
/* Save and restore the contents of the buffer used for localtime's
|
|
result around the call to gettimeofday. */
|
|
struct tm save = *localtime_buffer_addr;
|
|
# endif
|
|
|
|
# if defined timeval /* 'struct timeval' overridden by gnulib? */
|
|
# undef timeval
|
|
struct timeval otv;
|
|
int result = gettimeofday (&otv, (struct timezone *) tz);
|
|
if (result == 0)
|
|
{
|
|
tv->tv_sec = otv.tv_sec;
|
|
tv->tv_usec = otv.tv_usec;
|
|
}
|
|
# else
|
|
int result = gettimeofday (tv, (struct timezone *) tz);
|
|
# endif
|
|
|
|
# if GETTIMEOFDAY_CLOBBERS_LOCALTIME
|
|
*localtime_buffer_addr = save;
|
|
# endif
|
|
|
|
return result;
|
|
|
|
#else
|
|
|
|
# ifdef WINDOWS_NATIVE
|
|
|
|
/* On native Windows, there are two ways to get the current time:
|
|
GetSystemTimeAsFileTime
|
|
<https://msdn.microsoft.com/en-us/library/ms724397.aspx>
|
|
or
|
|
GetSystemTimePreciseAsFileTime
|
|
<https://msdn.microsoft.com/en-us/library/hh706895.aspx>. */
|
|
FILETIME current_time;
|
|
|
|
if (!initialized)
|
|
initialize ();
|
|
if (GetSystemTimePreciseAsFileTimeFunc != NULL)
|
|
GetSystemTimePreciseAsFileTimeFunc (¤t_time);
|
|
else
|
|
GetSystemTimeAsFileTime (¤t_time);
|
|
|
|
/* Convert from FILETIME to 'struct timeval'. */
|
|
/* FILETIME: <https://msdn.microsoft.com/en-us/library/ms724284.aspx> */
|
|
ULONGLONG since_1601 =
|
|
((ULONGLONG) current_time.dwHighDateTime << 32)
|
|
| (ULONGLONG) current_time.dwLowDateTime;
|
|
/* Between 1601-01-01 and 1970-01-01 there were 280 normal years and 89 leap
|
|
years, in total 134774 days. */
|
|
ULONGLONG since_1970 =
|
|
since_1601 - (ULONGLONG) 134774 * (ULONGLONG) 86400 * (ULONGLONG) 10000000;
|
|
ULONGLONG microseconds_since_1970 = since_1970 / (ULONGLONG) 10;
|
|
tv->tv_sec = microseconds_since_1970 / (ULONGLONG) 1000000;
|
|
tv->tv_usec = microseconds_since_1970 % (ULONGLONG) 1000000;
|
|
|
|
# else
|
|
|
|
# if !defined OK_TO_USE_1S_CLOCK
|
|
# error "Only 1-second nominal clock resolution found. Is that intended?" \
|
|
"If so, compile with the -DOK_TO_USE_1S_CLOCK option."
|
|
# endif
|
|
tv->tv_sec = time (NULL);
|
|
tv->tv_usec = 0;
|
|
|
|
# endif
|
|
|
|
return 0;
|
|
|
|
#endif
|
|
}
|