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Diffstat (limited to 'lib/util/gettime.c')
| -rw-r--r-- | lib/util/gettime.c | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/lib/util/gettime.c b/lib/util/gettime.c new file mode 100644 index 0000000..54fbcb3 --- /dev/null +++ b/lib/util/gettime.c @@ -0,0 +1,224 @@ +/* + * 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 |