mirror of https://code.videolan.org/videolan/vlc
compat: add clock_gettime for darwin
This commit is contained in:
parent
656d6b80c0
commit
f3f02e4ce8
|
@ -0,0 +1,127 @@
|
|||
/*****************************************************************************
|
||||
* clock_gettime.c: POSIX clock_gettime() replacement
|
||||
*****************************************************************************
|
||||
* Copyright © 2020 VLC authors and VideoLAN
|
||||
*
|
||||
* Author: Marvin Scholz <epirat07 at gmail dot com>
|
||||
*
|
||||
* This program 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 2.1 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 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, write to the Free Software Foundation,
|
||||
* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
|
||||
*****************************************************************************/
|
||||
|
||||
#ifdef __APPLE__
|
||||
|
||||
#ifdef HAVE_CONFIG_H
|
||||
# include <config.h>
|
||||
#endif
|
||||
|
||||
#include <sys/errno.h>
|
||||
#include <sys/types.h>
|
||||
#include <sys/time.h>
|
||||
#include <sys/sysctl.h>
|
||||
|
||||
/**
|
||||
* Get the absolute time at which the system was booted
|
||||
*
|
||||
* This time is changed whenever the clock is adjusted to
|
||||
* correctly reflect the boot time with the adjusted clock,
|
||||
* so just querying it once and reusing the value is not safe.
|
||||
*
|
||||
* \param[out] tv Timeval struct to write the boottime to
|
||||
*
|
||||
* \note
|
||||
* The boot time only has microsecond precision
|
||||
*
|
||||
* \return 0 on success, else -1 and errno set
|
||||
*/
|
||||
static int vlc__get_system_boottime(struct timeval *tv)
|
||||
{
|
||||
int ret = sysctl((int[]){ CTL_KERN, KERN_BOOTTIME }, 2,
|
||||
tv, &(size_t){ sizeof(*tv) }, NULL, 0);
|
||||
|
||||
if (ret != 0)
|
||||
return errno;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* Get the monotonic time (CLOCK_MONOTONIC)
|
||||
*
|
||||
* Calculates a monotically incrasing time since system boot
|
||||
* that continues to increment when the system is asleep.
|
||||
*
|
||||
* Warnings to everyone trying to simplify this:
|
||||
* - Using mach_continuous_time is not equivalent to this, see
|
||||
* the darwin manpage about CLOCK_MONOTONIC_RAW for an explanation.
|
||||
* - Using mach_absolute_time is not equivalent to this, as it does
|
||||
* not continue to increment when the system is asleep.
|
||||
* - The boot time is queried twice in a loop and only used if both
|
||||
* match. This is done to detect if the boot time change since we
|
||||
* obtained the current time of day, as the boot time can change
|
||||
* when the system wallclock is adjusted, as that will adjust the
|
||||
* boot time accordingly.
|
||||
*
|
||||
* \param[out] tv Timeval struct to write the monotonic time to
|
||||
*
|
||||
* \return 0 on success, else -1 and errno set
|
||||
*/
|
||||
static int vlc__get_monotonic(struct timeval *tv)
|
||||
{
|
||||
int ret;
|
||||
struct timeval currenttime;
|
||||
struct timeval boottime_begin;
|
||||
struct timeval boottime_end;
|
||||
|
||||
do {
|
||||
ret = vlc__get_system_boottime(&boottime_begin);
|
||||
if (ret != 0)
|
||||
return ret;
|
||||
|
||||
ret = gettimeofday(¤ttime, NULL);
|
||||
if (ret != 0)
|
||||
return ret;
|
||||
|
||||
ret = vlc__get_system_boottime(&boottime_end);
|
||||
if (ret != 0)
|
||||
return ret;
|
||||
} while (timercmp(&boottime_begin, &boottime_end, !=));
|
||||
|
||||
timersub(¤ttime, &boottime_begin, tv);
|
||||
return 0;
|
||||
}
|
||||
|
||||
int clock_gettime(clockid_t clock_id, struct timespec *tp)
|
||||
{
|
||||
int ret = 0;
|
||||
struct timeval tv;
|
||||
|
||||
switch (clock_id) {
|
||||
case CLOCK_MONOTONIC:
|
||||
ret = vlc__get_monotonic(&tv);
|
||||
break;
|
||||
case CLOCK_REALTIME:
|
||||
ret = gettimeofday(&tv, NULL);
|
||||
break;
|
||||
default:
|
||||
errno = EINVAL;
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (ret == 0)
|
||||
TIMEVAL_TO_TIMESPEC(&tv, tp);
|
||||
return ret;
|
||||
}
|
||||
|
||||
#endif
|
|
@ -928,6 +928,10 @@ AS_IF([test "${SYS}" != "mingw32"], [
|
|||
])
|
||||
AC_SUBST([LIBRT])
|
||||
|
||||
dnl Check for clock_* functions, needs to be done here,
|
||||
dnl after the -lrt check
|
||||
AC_REPLACE_FUNCS([clock_gettime])
|
||||
|
||||
dnl
|
||||
dnl Check for headers
|
||||
dnl
|
||||
|
|
|
@ -658,6 +658,17 @@ FILE *vlc_win32_tmpfile(void);
|
|||
|
||||
#ifdef __APPLE__
|
||||
# define fdatasync fsync
|
||||
|
||||
# include <time.h>
|
||||
# ifndef CLOCK_REALTIME
|
||||
# define CLOCK_REALTIME 0
|
||||
# endif
|
||||
# ifndef CLOCK_MONOTONIC
|
||||
# define CLOCK_MONOTONIC 6
|
||||
# endif
|
||||
# ifndef HAVE_CLOCK_GETTIME
|
||||
int clock_gettime(clockid_t clock_id, struct timespec *tp);
|
||||
# endif
|
||||
#endif
|
||||
|
||||
#ifdef __cplusplus
|
||||
|
|
Loading…
Reference in New Issue