On 2023-08-26 11:44, Martin Wege via Cygwin wrote:
On Fri, Aug 25, 2023 at 2:19 PM Corinna Vinschen via Cygwin
<cygwin@cygwin.com> wrote:
On Aug 23 01:05, Roland Mainz via Cygwin wrote:
Note that Cygwin does not interpret the file |myfifo.fifo| as FIFO,
instead it comes back as a symlink "myfifo.fifo -> ':\0:c4:1000'".
AFAIK there are (at least) these two options to fix the problems:
1. Check whether the filesystem for the fifos path is NFS
(cgywin.dll's |fs.fs_is_nfs()|), and if it is a symlink check if it
starts with ':\0:c4:' (assuming "c4" is the prefix for inodes created
with |mkfifo()|). If this condition is |true|, then cygwin |stat()|,
|open()| etc. should treat this inode as FIFO.
The downside is that it is not possible to diffentiate between Cygwin
FIFOs and real FIFOs created from the remote side in `ls -l'
output. Note that Cygwin returns the NFS stat info verbatim, so
a real FIFO is returned as a real FIFO:
linux$ mkfifo bar
cygwin$ ls -l bar
prw-r--r-- 1 corinna vinschen 0 Aug 25 13:58 bar
The idea was always to use NFS as exchange medium, but not as
installation medium for the entire distro or to keep Cygwin home
dirs on NFS. There were times where NFS was pretty unstable.
I used NFS for quite some time to build Cygwin packages, but at one
point I got trouble (performance problems with multiple concurrent
processes accessing an NFS share, build errors out of the blue),
so I switched to Samba shares, albeit grudgingly. I'm not yet
sure if the problems are fixed. At least a recent OpenSSH build
ran through without problems...
Corinna, could you please update the Cygwin documentation then? We use
NFS, both Windows builtin and CITI NFSv4.1, with Cygwin for years
without major problems, so that comment about exchange-medium-only is
clearly wrong!
Feel free to submit doc patches if you feel there is a lack.
We are all volunteers here - and that includes you!
--
Take care. Thanks, Brian Inglis Calgary, Alberta, Canada
La perfection est atteinte Perfection is achieved
non pas lorsqu'il n'y a plus rien à ajouter not when there is no more to add
mais lorsqu'il n'y a plus rien à retirer but when there is no more to cut
-- Antoine de Saint-Exupéry
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