Re: gnulib fsusage

[Po Lu <luangruo@yahoo.com>]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Po Lu <luangruo@yahoo.com>
>> Date: Thu, 19 Jan 2023 10:24:29 +0800
>> 
>> Apparently lib/fsusage.o is not built when there is no suitable way for
>> it to get the necessary information, but it is still used
>> unconditionally by Emacs.
>
> Not unconditionally: the implementation of file-system-info in
> fileio.c is conditioned on !DOS_NT, and both MSDOS and WINDOWSNT ports
> have their separate implementations which don't use Gnulib's fsusage.
>
>> Is this the right way to detect whether or not get_fs_usage is actually
>> present?
>
> Which port needs to exclude it, and why?  Is that port going to
> implement its own version of file-system-info?  We must have a
> non-trivial working implementation for each supported platform,
> because Dired (and Tramp?) uses it.

The Android port doesn't support statvfs, because that function is
missing from the Android C library, apparently for security reasons.

> If the port you are considering will have its own implementation, then
> the same method as DOS_NT uses will be appropriate.

I cannot find any way to do such an implementation, sorry.  But if
someone else knows, that would be great.  Thanks.