On Aug 9 11:12, Martin Wege via Cygwin wrote: > On Wed, Aug 9, 2023 at 10:01 AM Corinna Vinschen > <corinna-cyg...@cygwin.com> wrote: > > > > On Aug 8 21:38, Martin Wege via Cygwin wrote: > > > On Tue, Aug 8, 2023 at 10:20 AM Corinna Vinschen > > > <corinna-cyg...@cygwin.com> wrote: > > > > > > > > On Aug 7 23:14, Martin Wege via Cygwin wrote: > > > > > Secondly, how are fifos, other device nodes and mknod implemented? You > > > > > encode them as softlinks on ntfs? > > > > > > > > Not only on NTFS. FIFOs on the disk are always created as symlinks > > > > with a special target string, recognized by Cygwin. No differece on > > > > NFS. Microsoft NFSv3 has no way to specify creating a "real" FIFO > > > > on the remote filesystem. It wouldn't make sense anyway, because > > > > there's no way to share the FIFO across systems. > > > > > > So no Windows ioctl to do a mknod? > > > > Windows does not have provisions to store FIFOs on disk. The closest > > you get in Windows are Windows named pipes, and those are stored > > non-permanently in a special, temporary filesystem inside the native NT > > namespace. Try this in Cygwin: > > > > $ cd /proc/sys/Device/NamedPipe/ <-- trailing slash! > > $ ls -l > > > > FIFOs in the normal Windows filesystem are a Cygwin fake. > > Maybe make pipes in Cygwin symlinks to /proc/sys/Device/NamedPipe/?
Why? Windows Named Pipes don't act like UNIX FIFOs. > > > What does a Linux/FreeBSD FIFO file look like, if you export that > > > filesystem via NFSv3, and mount it via the native Windows NFSv3 > > > driver, and do a ls -l in Cygwin? > > > > It looks like a FIFO because MSFT NFSv3 exports the stat(2) info > > verbatim: > > > > linux$ mkfifo blubb > > > > cygwin$ ls -l blubb > > prw-r--r-- 1 corinna vinschen 0 Aug 8 10:22 blubb > > Will cygwin treat this as a FIFO? No. Cygwin FIFOs != Unix FIFOs. > Can cygwin set the 'p' flag via a magic ioctl? No. I don't understand your insistence to use FIFOs on NFS. There is no value in that, because you can't share them between systems anyway. https://www.unix.com/unix-for-advanced-and-expert-users/10861-fifo-over-nfs.html https://stackoverflow.com/questions/1038788/cant-write-to-fifo-file-mouted-via-nfs Corinna -- 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
