is the server processes used to interact with
client processes via the IP/TCP network protocol.
normally is expected to be running on server machines at all times.
Each machine with files of interest to users on other machines is
expected to be a file server and should run
A file server machine will service requests for both "private" and
"system" file collections.
No special action is necessary to support
private collections, as the client user is expected to supply all
For system collections, if the base directory
is not the default (see FILES below), an entry must be put into
the directory list file; this entry is a single text line containing
the name of the collection, one or more spaces, and the name of the
base directory for that collection.
Each collection should have
an entry in the host list file; this entry is a single text line
containing the name of the collection, one or more spaces, and
the name of the host machine acting as file server for that collection.
Details of setting up a file collection for the file server are
described in the manual entry for
generally runs as a network server process that listens for connections,
and for each connection (double-)forks a process to handle the interaction
with the client.
However, with the -d flag, no forking will take place:
the server will listen for a network connection, handle it, and exit.
This is useful for debugging the servers in "live" mode rather than as
For debugging purposes, the -P "debugging ports" flag can be used.
It will cause the selection of an alternate, non-privileged set of
TCP ports instead of the usual ports, which are reserved for the
active server processes. The -N "network debugging" flag can be used
to produce voluminous messages describing the network communication
progress and status. The more -N switches that you use the more output
you get. Use 3 (separated by spaces: -N -N -N) to get a complete record
of all network messages. Log messages are printed by
log messages, the -q "quiet" flag can be used.
uses libwrap style access control (the /etc/hosts.allow and /etc/hosts.deny
files) with service name "supfilesrv". The -l "log" flag turn on loggin of
accepted connections (denied connections are always logged).
will only respond to 3 requests simultaneously, forking a child
process for each client. If it gets additional requests it will respond
with the error FSSETUPBUSY. The -C MaxChildren switch can be used
to increase (or decrease) this number.
listens to IPv4 listening socket by default.
With the -6 flag, it will listen to IPv6 listening socket.
For dual stack support you will want to run two instances of
It is possible to pre-compile a list of the files in a collection
service that collection much faster. This can be done by running
on the desired collection on the repository machine. This produces a
list of all the files in the collection at the time of the
subsequent upgrades will be based on this list of files rather than
actually scanning the disk at the time of the upgrade. Of course,
the upgrade will consequently bring the client machine up to the status
of the repository machine as of the time of the
rather than as of the time of the upgrade; hence, if
is used, it should be run periodically on the
This facility is useful for extremely large file collections
that are upgraded many times per day, such as the CMU UNIX system
software. The "verbose" flag
to produce output messages as it scans the files in the collection.
The "system" flag
to scan all system collections residing on the current host.
parameter must be specified if the collection is a private
collection whose base directory is not the default.