info: Add utc_offset info for external usage #1923
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This patch is to make the UTC time adjustment easier than https://youtu.be/KtVdeHfD45o?si=hIMvE10XI87XqXIW. |
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The remaing job is to make this feature doesn't break previously recorded data to support backward compatibility. |
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cmds/info.c
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| if (info_mask & UTC_OFFSET) | ||
| process(data, fmt, "utc offset", info->utc_offset); |
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I think the info->utc_offset is for internal information so better not to be printed in uftrace info output.
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It's now removed after another update.
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I just fixed @namhyung @MatthewKhouzam I think it's good to be merged now. Please have a look. |
cmds/info.c
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| /* calculate time offset between UTC and clock_source. */ | ||
| offset = difftime(current_time, ts.tv_sec); | ||
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| dprintf(fha->fd, "utc_offset:%ld\n", (time_t)offset); |
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For %ld, you'd better cast it to unsigned long.
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As I understand, time_t is long type so %ld is used instead of %lu.
# 143 "/usr/include/x86_64-linux-gnu/bits/types.h" 2 3 4
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typedef long int __time_t;
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typedef __time_t time_t;Since this offset is used to adjust the other time_t value for UTC time, I made it casted to the same type time_t. Should I change it to unsigned long and print it with %lu instead?
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Oh, sorry. I meant long. But it could be different on different architecture or distro. So I think it's better to explicitly cast to long instead of time_t.
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OK. I've just changed it to use long for offset type itself.
In some cases, there is a requirement to get the time offset between UTC time and our timestamp from the given clock source, CLOCK_MONOTONIC by default. This patch provides an additional info to provide UTC time offset in the output of uftrace info. This number can be used to make time adjustment easier for external tools such as tracecompass[1]. Closes: namhyung#1916 [1] https://eclipse.dev/tracecompass Requested-by: Matthew Khouzam <matthew.khouzam@gmail.com> Signed-off-by: Honggyu Kim <honggyu.kp@gmail.com>
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In some cases, there is a requirement to get the time offset between UTC time and our timestamp from the given clock source, CLOCK_MONOTONIC by default.
This patch provides an additional info to provide UTC time offset in the output of uftrace info.
This number can be used to make time adjustment easier for external tools such as tracecompass[1].
Closes: #1916
[1] https://eclipse.dev/tracecompass
Requested-by: Matthew Khouzam matthew.khouzam@gmail.com
Signed-off-by: Honggyu Kim honggyu.kp@gmail.com