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sudo/lib/util/gettime.c

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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 2014-2018 Todd C. Miller <Todd.Miller@sudo.ws>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* This is an open source non-commercial project. Dear PVS-Studio, please check it.
* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
*/
#include <config.h>
#include <sys/time.h>
#include <time.h>
#if defined(__MACH__) && !defined(HAVE_CLOCK_GETTIME)
# include <mach/mach.h>
# include <mach/mach_time.h>
# include <mach/clock.h>
#endif
#include <sudo_compat.h>
#include <sudo_debug.h>
#include <sudo_util.h>
/*
* On Linux and FreeBSD, CLOCK_MONOTONIC does not run while sleeping.
* Linux provides CLOCK_BOOTTIME which runs while sleeping (FreeBSD does not).
* Some systems provide CLOCK_UPTIME which only runs while awake.
*/
#if defined(CLOCK_BOOTTIME)
# define SUDO_CLOCK_BOOTTIME CLOCK_BOOTTIME
#elif defined(CLOCK_MONOTONIC_RAW)
# define SUDO_CLOCK_BOOTTIME CLOCK_MONOTONIC_RAW
#elif defined(CLOCK_MONOTONIC)
# define SUDO_CLOCK_BOOTTIME CLOCK_MONOTONIC
#endif
#if defined(CLOCK_UPTIME_RAW)
# define SUDO_CLOCK_UPTIME CLOCK_UPTIME_RAW
#elif defined(CLOCK_UPTIME)
# define SUDO_CLOCK_UPTIME CLOCK_UPTIME
#elif defined(CLOCK_MONOTONIC)
# define SUDO_CLOCK_UPTIME CLOCK_MONOTONIC
#endif
/*
* Wall clock time, may run backward.
*/
#if defined(HAVE_CLOCK_GETTIME)
int
sudo_gettime_real_v1(struct timespec *ts)
{
debug_decl(sudo_gettime_real, SUDO_DEBUG_UTIL);
if (clock_gettime(CLOCK_REALTIME, ts) == -1) {
struct timeval tv;
sudo_debug_printf(SUDO_DEBUG_WARN|SUDO_DEBUG_ERRNO|SUDO_DEBUG_LINENO,
"clock_gettime(CLOCK_REALTIME) failed, trying gettimeofday()");
if (gettimeofday(&tv, NULL) == -1)
debug_return_int(-1);
TIMEVAL_TO_TIMESPEC(&tv, ts);
}
debug_return_int(0);
}
#else
int
sudo_gettime_real_v1(struct timespec *ts)
{
struct timeval tv;
debug_decl(sudo_gettime_real, SUDO_DEBUG_UTIL);
if (gettimeofday(&tv, NULL) == -1)
debug_return_int(-1);
TIMEVAL_TO_TIMESPEC(&tv, ts);
debug_return_int(0);
}
#endif
/*
* Monotonic time, only runs forward.
* We use a timer that only increments while sleeping, if possible.
*/
#if defined(HAVE_CLOCK_GETTIME) && defined(SUDO_CLOCK_BOOTTIME)
int
sudo_gettime_mono_v1(struct timespec *ts)
{
static int has_monoclock = -1;
debug_decl(sudo_gettime_mono, SUDO_DEBUG_UTIL);
/* Check whether the kernel/libc actually supports a monotonic clock. */
# ifdef _SC_MONOTONIC_CLOCK
if (has_monoclock == -1)
has_monoclock = sysconf(_SC_MONOTONIC_CLOCK) != -1;
# endif
if (!has_monoclock)
debug_return_int(sudo_gettime_real(ts));
if (clock_gettime(SUDO_CLOCK_BOOTTIME, ts) == -1) {
sudo_debug_printf(SUDO_DEBUG_WARN|SUDO_DEBUG_ERRNO|SUDO_DEBUG_LINENO,
"clock_gettime(%d) failed, using wall clock",
(int)SUDO_CLOCK_BOOTTIME);
has_monoclock = 0;
debug_return_int(sudo_gettime_real(ts));
}
debug_return_int(0);
}
#elif defined(HAVE_GETHRTIME)
int
sudo_gettime_mono_v1(struct timespec *ts)
{
hrtime_t nsec;
debug_decl(sudo_gettime_mono, SUDO_DEBUG_UTIL);
nsec = gethrtime();
ts->tv_sec = nsec / 1000000000;
ts->tv_nsec = nsec % 1000000000;
debug_return_int(0);
}
#elif defined(__MACH__)
int
sudo_gettime_mono_v1(struct timespec *ts)
{
uint64_t abstime, nsec;
static mach_timebase_info_data_t timebase_info;
debug_decl(sudo_gettime_mono, SUDO_DEBUG_UTIL);
if (timebase_info.denom == 0)
(void) mach_timebase_info(&timebase_info);
#ifdef HAVE_MACH_CONTINUOUS_TIME
abstime = mach_continuous_time(); /* runs while asleep */
#else
abstime = mach_absolute_time(); /* doesn't run while asleep */
#endif
nsec = abstime * timebase_info.numer / timebase_info.denom;
ts->tv_sec = nsec / 1000000000;
ts->tv_nsec = nsec % 1000000000;
debug_return_int(0);
}
#else
int
sudo_gettime_mono_v1(struct timespec *ts)
{
/* No monotonic clock available, use wall clock. */
return sudo_gettime_real(ts);
}
#endif
/*
* Monotonic time, only runs forward.
* We use a timer that only increments while awake, if possible.
*/
#if defined(HAVE_CLOCK_GETTIME) && defined(SUDO_CLOCK_UPTIME)
int
sudo_gettime_awake_v1(struct timespec *ts)
{
static int has_monoclock = -1;
debug_decl(sudo_gettime_awake, SUDO_DEBUG_UTIL);
/* Check whether the kernel/libc actually supports a monotonic clock. */
# ifdef _SC_MONOTONIC_CLOCK
if (has_monoclock == -1)
has_monoclock = sysconf(_SC_MONOTONIC_CLOCK) != -1;
# endif
if (!has_monoclock)
debug_return_int(sudo_gettime_real(ts));
if (clock_gettime(SUDO_CLOCK_UPTIME, ts) == -1) {
sudo_debug_printf(SUDO_DEBUG_WARN|SUDO_DEBUG_ERRNO|SUDO_DEBUG_LINENO,
"clock_gettime(%d) failed, using wall clock",
(int)SUDO_CLOCK_UPTIME);
has_monoclock = 0;
debug_return_int(sudo_gettime_real(ts));
}
debug_return_int(0);
}
#elif defined(HAVE_GETHRTIME)
int
sudo_gettime_awake_v1(struct timespec *ts)
{
hrtime_t nsec;
debug_decl(sudo_gettime_awake, SUDO_DEBUG_UTIL);
/* Currently the same as sudo_gettime_mono() */
nsec = gethrtime();
ts->tv_sec = nsec / 1000000000;
ts->tv_nsec = nsec % 1000000000;
debug_return_int(0);
}
#elif defined(__MACH__)
int
sudo_gettime_awake_v1(struct timespec *ts)
{
uint64_t abstime, nsec;
static mach_timebase_info_data_t timebase_info;
debug_decl(sudo_gettime_awake, SUDO_DEBUG_UTIL);
if (timebase_info.denom == 0)
(void) mach_timebase_info(&timebase_info);
abstime = mach_absolute_time();
nsec = abstime * timebase_info.numer / timebase_info.denom;
ts->tv_sec = nsec / 1000000000;
ts->tv_nsec = nsec % 1000000000;
debug_return_int(0);
}
#else
int
sudo_gettime_awake_v1(struct timespec *ts)
{
/* No monotonic uptime clock available, use wall clock. */
return sudo_gettime_real(ts);
}
#endif
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