FIFO with group-only permissions fails with "Permission denied" ...

[Roland Mainz]

Hi!

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I'm trying to create a Cygwin FIFO which can only be read and written by admins:
---- snip ----
# as admin
mkfifo system_cmd_fifo
chgrp 544 system_cmd_fifo
chmod a-rwx,g+rw system_cmd_fifo
cat <system_cmd_fifo
---- snip ----
... but the "cat <system_cmd_fifo" returns a "Permission denied" error...

Why does this happen - because Group "544" ("Administratoren") is not
a user SID ?

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Bye,
Roland
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