- 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 timespechas 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