clkdump

• Goal? Dump clock_gettime(2) output each second.
• Why? Debug clock status across kernel suspend.
• What? Print to stdout every second the current datetime, the output of clock_gettime() and the delta with the previous output. This is done for every clock type.

Example usage below.

• First column is gmtime(time(NULL)) formatted output.
• Second column is clock name.
• Third column is clock value (struct timespec has seconds and nanoseconds).
• Fourth column is delta with previous value of the same clock.

./clkdump | grep -e 'MONOTONIC\s' -e 'TAI'
Sat, 1 Jan 2000 00:35:10 GMT    CLOCK_TAI          946686910 s + 738663970 ns     1.000084 s
Sat, 1 Jan 2000 00:35:10 GMT    CLOCK_MONOTONIC         1908 s + 984282665 ns     1.000084 s
Sat, 1 Jan 2000 00:35:11 GMT    CLOCK_TAI          946686911 s + 738747045 ns     1.000083 s
Sat, 1 Jan 2000 00:35:11 GMT    CLOCK_MONOTONIC         1909 s + 984365775 ns     1.000083 s
Sat, 1 Jan 2000 00:35:12 GMT    CLOCK_TAI          946686912 s + 738827060 ns     1.000080 s
Sat, 1 Jan 2000 00:35:12 GMT    CLOCK_MONOTONIC         1910 s + 984445785 ns     1.000080 s
Sat, 1 Jan 2000 00:35:55 GMT    CLOCK_TAI          946686955 s + 834063590 ns    43.095237 s
Sat, 1 Jan 2000 00:35:55 GMT    CLOCK_MONOTONIC         1954 s +  79683035 ns    43.095237 s
Sat, 1 Jan 2000 00:35:56 GMT    CLOCK_TAI          946686956 s + 834202020 ns     1.000138 s
Sat, 1 Jan 2000 00:35:56 GMT    CLOCK_MONOTONIC         1955 s +  79820815 ns     1.000138 s
Sat, 1 Jan 2000 00:35:57 GMT    CLOCK_TAI          946686957 s + 834299360 ns     1.000097 s
Sat, 1 Jan 2000 00:35:57 GMT    CLOCK_MONOTONIC         1956 s +  79918115 ns     1.000097 s
Sat, 1 Jan 2000 00:35:58 GMT    CLOCK_TAI          946686958 s + 834427260 ns     1.000128 s
Sat, 1 Jan 2000 00:35:58 GMT    CLOCK_MONOTONIC         1957 s +  80046225 ns     1.000128 s