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https://issues.apache.org/jira/browse/TS-1645?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yakov Kopel updated TS-1645:
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Attachment: stat_1.diff
> increase the file stat resolution
> ---------------------------------
>
> Key: TS-1645
> URL: https://issues.apache.org/jira/browse/TS-1645
> Project: Traffic Server
> Issue Type: Bug
> Components: Management
> Reporter: Yakov Kopel
> Attachments: stat_1.diff
>
>
> today the check of "file has been changed" is done by "stat" with resolution
> of seconds.
> I'm adding a patch to increase the resolution to neno-seconds. this is
> supported in part of file systems and kernels, but done no harm to others
> (the nanoseconds just be 0).
> from the man page:
> Since kernel 2.5.48, the stat structure supports nanosecond resolution for
> the three file timestamp fields. Glibc exposes the nanosecond component of
> each field using names of the form st_atim.tv_nsec if the _BSD_SOURCE or
> _SVID_SOURCE feature test macro is defined. These fields are specified in
> POSIX.1-2008, and, starting with version 2.12, glibc also exposes these field
> names if _POSIX_C_SOURCE is defined with the value 200809L or greater, or
> _XOPEN_SOURCE is defined with the value 700 or greater. If none of the
> aforementioned macros are defined, then the nanosecond values are exposed
> with names of the form st_atimensec. On file systems that do not support
> subsecond timestamps, the nanosecond fields are returned with the value 0.
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