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should
be run at boot time by (see If your can respawn arbitrary daemons,
can be run from init instead; then init will restart it if it crashes.
You must use the option to prevent from backgrounding itself, or init
will become confused. When running, internet sockets. When a connection
is found on one of its sockets, it looks up what service the socket corresponds
to, and invokes a program to service the request. After the program is
finished, it will continue to listen on the socket, except in some special
cases which will be described below. Essentially, allows running one
daemon to invoke several others, reducing load on the system. The options
available for Turns on several kinds of debugging and make inetd behave
if run in a debugger. Also implies Do not background; for running from
Sets the size of the socket listen queue to the specified value. Default
is 128. Upon execution, reads its configuration information from a configuration
file which, by default, is There must be an entry for each field of the
configuration file, with entries for each field separated by a tab or a
space. Comments are denoted by a ‘‘#’’ at the beginning of a line. There must
be an entry for each field. The fields of the configuration file are as
follows: service name[@hostname] socket type protocol wait/nowait[.max]
user[.group] server program server program arguments To specify an based
service, the entry would contain these fields. service name/version[@hostname]
socket type rpc/protocol wait/nowait[.max] user[.group] server program server
program arguments The entry is the name of a valid service in the file
For services (discussed below), the service name be the official name
of the service (that is, the first entry in When used to specify a based
service, this field is a valid RPC service name in the file The part on
the right of the is the RPC version number. This can simply be a single
numeric argument or a range of versions. A range is bounded by the low version
to the high version - If a string of the form is appended to the service,
it causes inetd to bind to the port for the service on only the specific
IP address associated with instead of listening on all available addresses.
This can be done as many times as desired for different addresses, which
permits setting up ‘‘virtually hosted’’ services. Note, however, that while
you can listen to as many specific addresses as you want, kernel restrictions
prevent from listening to the same port on a specific address and the
general address at once. should be a resolvable hostname or an IP address
associated with one of the interfaces of the local system.
The should
be one of or depending on whether the socket is a stream, datagram,
raw, reliably delivered message, or sequenced packet socket. The must
be a valid protocol as given in Examples might be or Rpc based services
are specified with the or service type.
The entry is applicable to
datagram sockets only (other sockets should have a entry in this space).
If a datagram server connects to its peer, freeing the socket so can
received further messages on the socket, it is said to be a server, and
should use the entry. For datagram servers which process all incoming
datagrams on a socket and eventually time out, the server is said to be
and should use a entry. and are both examples of the latter type of
datagram server. is an exception; it is a datagram server that establishes
pseudo-connections. It must be listed as in order to avoid a race; the server
reads the first packet, creates a new socket, and then forks and exits
to allow to check for new service requests to spawn new servers. The optional
suffix (separated from or by a dot) specifies the maximum number of
server instances that may be spawned from within an interval of 60 seconds.
When omitted, defaults to 40. The entry should contain the user name
of the user as whom the server should run. This allows for servers to be
given less permission than root. An optional group name can be specified
by appending a dot to the user name followed by the group name. This allows
for servers to run with a different (primary) group id than specified in
the password file. If a group is specified and user is not root, the supplementary
groups associated with that user will still be set. The entry should contain
the pathname of the program which is to be executed by when a request
is found on its socket. If provides this service internally, this entry
should be The should be just as arguments normally are, starting with
argv[0], which is the name of the program. If the service is provided internally,
the word should take the place of this entry. provides several services
internally by use of routines within itself. These services are (character
generator), (human readable time), and (machine readable time, in the
form of the number of seconds since midnight, January 1, 1900). All of
these services are tcp based. For details of these services, consult the
appropriate from the Network Information Center. rereads its configuration
file when it receives a hangup signal, Services may be added, deleted
or modified when the configuration file is reread. creates a file that
contains its process identifier.
The command appeared
in Support for based services is modelled after that provided by
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