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Re: file access time and file modification time


From: Chet Ramey
Subject: Re: file access time and file modification time
Date: Tue, 9 Jul 2019 14:11:41 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.2

On 7/9/19 12:12 PM, address@hidden wrote:

>> The code just returns (atime <= mtime), and has since 1997. It uses the
>> st_atime and st_mtime fields. I should update it to use timespecs if
>> they're available, and (mtime > atime) might work closer to your
>> expectations.
>>
>> After the call to mktemp, the atime and mtime are the same, so the test
>> returns true.
> 
> I see. Indeed, it is confusing to me because I would not consider a file 
> whose atime and mtime are equal to have been "modified since it was last 
> read", notwithstanding that the newborn file has not yet been read at all. I 
> think that it would help for the documentation to address this nuance.
> 
> As for the possibility of using the timespec fields, that would be terrific.

That's already done.

And we'll try the (mtime > atime) variant as well.

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    address@hidden    http://tiswww.cwru.edu/~chet/



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