[jira] [Created] (TS-1645) increase the file stat resolution

["Yakov Kopel (JIRA)" <ji...@apache.org>]

Yakov Kopel created TS-1645:
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             Summary: 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


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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