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(am-utils.info)Hlfsd

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Hlfsd
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   Hlfsd is a daemon which implements a filesystem containing a
symbolic link to subdirectory within a user's home directory, depending
on the user which accessed that link.  It was primarily designed to
redirect incoming mail to users' home directories, so that it can be
read from anywhere.  It was designed and implemented by Erez Zadok
<ezk@cs.columbia.edu> and Alexander Dupuy <dupuy@cs.columbia.edu>, at
the Computer Science Department (http://www.cs.columbia.edu/) of
Columbia University (http://www.columbia.edu/).  A paper
(http://www.cs.columbia.edu/~ezk/research/hlfsd/hlfsd.html) on Hlfsd
was presented at the Usenix LISA VII conference in 1993.

   Hlfsd operates by mounting itself as an NFS server for the directory
containing linkname, which defaults to `/hlfs/home'.  Lookups within
that directory are handled by Hlfsd, which uses the password map to
determine how to resolve the lookup.  The directory will be created if
it doesn't already exist.  The symbolic link will be to the accessing
user's home directory, with subdir appended to it.  If not specified,
subdir defaults to `.hlfsdir'.  This directory will also be created if
it does not already exist.

   A `SIGTERM' sent to Hlfsd will cause it to shutdown.  A `SIGHUP'
will flush the internal caches, and reload the password map.  It will
also close and reopen the log file, to enable the original log file to
be removed or rotated.  A `SIGUSR1' will cause it to dump its internal
table of user IDs and home directories to the file `/tmp/hlfsddump'.

Introduction to Hlfsd

Background to Mail Delivery

Using Hlfsd