Link: https://stackoverflow.com/questions/3756323/how-to-get-the-current-time-in-milliseconds-from-c-in-linux
Description: WebSep 20, 2010 · if (ms > 999) {. s++; ms = 0; } printf("Current time: %"PRIdMAX".%03ld seconds since the Epoch\n", (intmax_t)s, ms); } If your goal is to measure elapsed time, and your system supports the "monotonic clock" option, then you should consider using CLOCK_MONOTONIC instead of CLOCK_REALTIME.
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Link: https://www.man7.org/linux/man-pages/man3/clock_gettime.3.html
Description: WebSYNOPSIS top. #include <time.h> int clock_getres(clockid_t clockid, struct timespec *res); int clock_gettime(clockid_t clockid, struct timespec *tp); int clock_settime(clockid_t clockid, const struct timespec *tp); Link with -lrt (only for glibc versions before 2.17). Feature Test Macro Requirements for glibc (see feature_test_macros(7 ...
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Link: https://www.man7.org/linux/man-pages/man2/time.2.html
Description: WebLIBRARY top. Standard C library ( libc, -lc ) SYNOPSIS top. #include <time.h>time_t time (time_t *_Nullable tloc); DESCRIPTION top. time () returns the time as the number of seconds since the Epoch, 1970-01-01 00:00:00 +0000 (UTC). If tloc is non-NULL, the return value is also stored in the memory pointed to by tloc . RETURN VALUE top.
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Link: https://stackoverflow.com/questions/14726401/starting-point-for-clock-monotonic
Description: WebFeb 6, 2013 · sysinfo(&info); /* calculate boot time in seconds since the Epoch */. const time_t boottime = time(NULL) - info.uptime; /* get monotonic clock time */. struct timespec monotime; clock_gettime(CLOCK_MONOTONIC, &monotime); /* calculate current time in seconds since the Epoch */. time_t curtime = boottime + monotime.tv_sec; /* get realtime …
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Link: https://www.gnu.org/software/libc/manual/html_node/Getting-the-Time.html
Description: WebMonotonic time is useful for measuring elapsed times, because it guarantees that those measurements are not affected by changes to the system clock. Macro: clockid_tCLOCK_MONOTONIC ¶. System-wide clock that continuously measures the advancement of calendar time, ignoring discontinuous changes to the system’s setting for …
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Link: https://stackoverflow.com/questions/3523442/difference-between-clock-realtime-and-clock-monotonic
Description: WebAug 19, 2010 · 1. There's one big difference between CLOCK_REALTIME and MONOTONIC. CLOCK_REALTIME can jump forward or backward according to NTP. By default, NTP allows the clock rate to be speeded up or slowed down by up to 0.05%, but NTP cannot cause the monotonic clock to jump forward or backward. answered Jan 24, 2021 at 20:38.
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Link: https://www.man7.org/linux/man-pages/man2/times.2.html
Description: WebDESCRIPTION top. times () stores the current process times in the struct tms that. buf points to. The struct tms is as defined in <sys/times.h> : struct tms { clock_t tms_utime; /* user time */ clock_t tms_stime; /* system time */ clock_t tms_cutime; /* user time of children */ clock_t tms_cstime; /* system time of children */ };
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Link: https://linux.die.net/man/2/clock_gettime
Description: WebClock that cannot be set and represents monotonic time since some unspecified starting point. This clock is not affected by discontinuous jumps in the system time (e.g., if the system administrator manually changes the clock), but is affected by the incremental adjustments performed by adjtime (3) and NTP.
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Link: https://stackoverflow.com/questions/62910438/monotonic-clock-in-c
Description: WebJul 15, 2020 · CLOCK_MONOTONIC_RAW (since Linux 2.6.28; Linux-specific) Similar to CLOCK_MONOTONIC, but provides access to a raw hardware-based time that is not subject to NTP adjustments or the incremental adjustments performed by adjtime(3). This clock does not count time that the system is sus‐ pended.
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Link: https://www.man7.org/linux/man-pages/man2/clock_gettime.2.html
Description: WebLIBRARY top. Standard C library ( libc, -lc ), since glibc 2.17. Before glibc 2.17, Real-time library ( librt, -lrt ) SYNOPSIS top. #include <time.h> int clock_getres(clockid_t clockid, struct timespec *_Nullable res); int clock_gettime(clockid_t clockid, struct timespec *tp); int clock_settime(clockid_t clockid, const struct timespec *tp); .
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