Re: How to check a file's modify time is at epoch 0?

[Chet Ramey]

On 10/27/19 10:00 PM, Eli Schwartz wrote:
> On 10/27/19 7:29 PM, Peng Yu wrote:
>> Thanks. But I am looking for something native to bash. Involvement
>> with external programs will slow down the run time.
> 
> No, there is no bash builtin that lets you stat the filesize directly.
> 
> I was going to say, assuming your distribution of bash included the
> built contents of examples/loadables/, you could use the example
> loadable 'finfo'. However,
> 
> $ enable -f /usr/lib/bash/finfo finfo
> -bash: enable: cannot open shared object /usr/lib/bash/finfo:
> /usr/lib/bash/finfo: undefined symbol: minor
> 
> Other loadables provided in my Arch Linux package work fine, just this
> one does not.
> 
> Chet -- when I try to compile finfo.c, I get this warning:
> 
> finfo.c: In function ‘printst’:
> finfo.c:277:7: warning: implicit declaration of function ‘major’
> [-Wimplicit-function-declaration]
>   277 |  ma = major (st->st_rdev);
>       |       ^~~~~
> finfo.c:278:7: warning: implicit declaration of function ‘minor’
> [-Wimplicit-function-declaration]
>   278 |  mi = minor (st->st_rdev);
>       |       ^~~~~
> 
> If I add an #include <sys/sysmacros.h> then it compiles okay and I can
> load it and it works as expected.

Interesting. On Linux, <sys/sysmacros.h> is usually included from
<sys/types.h> if __USE_BSD is defined (as it is, apparently, on RHEL,
through one of the twisty maze of defines in <features.h>).

-- 
``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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