On Tue, Aug 22, 2023 at 12:07 AM Brian Inglis <brian.ing...@shaw.ca> wrote: > > On 2023-08-21 06:03, Martin Wege via Cygwin wrote: > > On Sat, Aug 19, 2023 at 7:50 PM Brian Inglis <brian.ing...@shaw.ca> wrote: > >> > >> On 2023-08-18 07:09, Martin Wege via Cygwin wrote: > >>> On Fri, Aug 18, 2023 at 10:44 AM Corinna Vinschen via Cygwin > >>> <cygwin@cygwin.com> wrote: > >>>> > >>>> On Aug 17 20:49, Martin Wege via Cygwin wrote: > >>>>> On Mon, Aug 14, 2023 at 10:56 PM Corinna Vinschen via Cygwin > >>>>> <cygwin@cygwin.com> wrote: > >>>>>> and the result is the same. Note that Cygwin supports MSFT NFSv3 but > >>>>>> not CITI NFSv4.1 internally. No gurantee that Cygwin always does what > >>>>>> is necessary for that other NFS. > >>>>> > >>>>> 1. How does Cygwin detect whether something is a MSFT NFSv3, or not? > >>>>> Cygwin /bin/mount lists the CITI NFSv4.1 as 'nfs', so there *IS* > >>>>> something which detects that? > >>>> > >>>> The filesystem name returned by NtQueryVolumeInformationFile is "NFS". > >>>> If any other NFS returns the same filesystem name, it will be treated > >>>> just like MSFT NFSv3. > >>>> > >>>>> 2. Are Cygwin soft link handing depend on MSFT NFSv3 or not, i.e. does > >>>>> the Cygwin soft link code behave differently for MSFT NFSv3 file > >>>>> systems? > >>>> > >>>> Yes. NFS doesn't support symlink creation and symlink reading via > >>>> the usual functions, because Windows symlinks are created as reparse > >>>> points. NFS doesn't support reparse points. So the developers of > >>>> the MSFT NFS client had to invent their own way to create and > >>>> read NFS symlinks: > >>>> > >>>> https://sourceware.org/git/?p=newlib-cygwin.git;a=blob;f=winsup/cygwin/path.cc;hb=HEAD#l1719 > >>>> > >>>> https://sourceware.org/git/?p=newlib-cygwin.git;a=blob;f=winsup/cygwin/path.cc;hb=HEAD#l2750 > >>>> > >>>>> 3. Does Cygwin implement the pathconf() api? > >>>> > >>>> Yes. Surprisingly, you can check this yourself by just calling the > >>>> function and trying to compile your code. > >>> > >>> Apologies, how do we say in German? "Ich sollte meine Frage > >>> konkretisieren:" > >>> > >>> Does the Cygwin implementation of pathconf() support query data of the > >>> underlying filesystem based on data from the kernel, as UNIX does? So > >>> pathconf() returns different values for NTFS, ReFS, or Windows builtin > >>> NFSv3? > >>> > >>> I am asking, because as far as I know the Linux implementation is not > >>> a syscall, and instead glibc guesses values based on builtin static > >>> data, and whatever fstatfs() has to offer. Compared to that UNIX > >>> (Solaris, AIX, HPUX, ...) have pathconf() as a syscall, and actually > >>> ask the filesystem itself. > >> > >> Many library functions are implemented as documented either in the Cygwin > >> packages cygwin-doc and man-pages-posix available for installation; and > >> use as > >> e.g. `man 3p fpathconf`, also available online at: > >> https://pubs.opengroup.org/onlinepubs/9699919799/functions/fpathconf.html > >> or > >> https://man7.org/linux/man-pages/man3/fpathconf.3p.html > >> and for comparison and reference we make Cygwin package man-pages-linux > >> available for installation; and use as e.g. `man -m linux 3 fpathconf`, > >> also > >> available online at: > >> > >> https://man7.org/linux/man-pages/man3/fpathconf.3.html > >> > >> suggestions for setup are in the package announcements made every 9-12 > >> weeks > >> when the latest Linux man-pages package is released and updated on Cygwin. > >> > >> Please also note that the getconf(1) program is installed as part of > >> Cygwin and > >> can access f/pathconf variables associated with a pathname argument, as > >> shown in > >> getconf(1) `man 1 getconf` and getconf(1p) `man 1p getconf`. > > > > Thanks, but my question was about the Cygwin *implementation*: Does it > > distinguish between NTFS, REFS, FAT, NFS? Does it use data obtained > > from the Windows kernel at runtime, or does it rely on static data > > compiled into the cygwin.dll library? > > My suggestion was to encourage you to try out the command on the relevant > filesystems, or feel free to check out the repo and the implementation.
Where in the git is the implementation of pathconf()? Thanks, Martin -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple
