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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