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           xinetd [options]


           xinetd  performs  the  same  function as inetd: it starts programs that
           provide Internet services.  Instead of having such servers  started  at
           system  initialization  time, and be dormant until a connection request
           arrives, xinetd is the only daemon process started and  it  listens  on
           all  service  ports  for the services listed in its configuration file.
           When a request comes in, xinetd starts the appropriate server.  Because
           of  the  way it operates, xinetd (as well as inetd) is also referred to
           as a super-server.
           The services listed in xinetd's configuration  file  can  be  separated
           into two groups.  Services in the first group are called multi-threaded
           and they require the forking of a new server process for each new  con-
           nection  request.   The  new  server then handles that connection.  For
           such services, xinetd keeps listening for new requests so that  it  can
           spawn  new  servers.  On the other hand, the second group includes ser-
           vices for which the service daemon is responsible for handling all  new
           connection  requests.   Such  services  are  called single-threaded and
           xinetd will stop handling new requests for them until the server  dies.
           Services in this group are usually datagram-based.
           So far, the only reason for the existence of a super-server was to con-
           serve system resources by avoiding to fork a  lot  of  processes  which
           might  be  dormant  for  most of their lifetime.  While fulfilling this
           function, xinetd takes advantage of the idea of a super-server to  pro-
           vide  features such as access control and logging.  Furthermore, xinetd
           is not limited to services listed in /etc/services.  Therefore, anybody
           can use xinetd to start special-purpose servers.


           -d     Enables debug mode. This produces a lot of debugging output, and
                  it makes it possible to use a debugger on xinetd.
           -syslog syslog_facility
                  This option enables syslog logging of  xinetd-produced  messages
                  using  the  specified  syslog  facility.  The following facility
                  names are supported: daemon, auth, user, local[0-7] (check  sys-
                  log.conf(5)  for their meanings).  This option is ineffective in
                  debug mode since all relevant messages are sent to the terminal.
           -filelog logfile
                  xinetd-produced  messages  will be placed in the specified file.
                  Messages are always appended to the file.  If the file does  not
                  exist,  it will be created.  This option is ineffective in debug
                  mode since all relevant messages are sent to the terminal.
           -f config_file
                  Determines the file that  xinetd  uses  for  configuration.  The
                  default is /etc/xinetd.conf.
                  This option places a limit on the number of concurrently running
                  processes that can be started by xinetd.  Its purpose is to pre-
                  vent process table overflows.
           -logprocs limit
                  This option places a limit on the number of concurrently running
                  servers for remote userid acquisition.
                  This option causes xinetd to print out its version  information.
                  This option causes xinetd to read /etc/inetd.conf in addition to
                  the standard xinetd config files.  /etc/inetd.conf is read after
                  the standard xinetd config files.
           -cc interval
                  This  option  instructs  xinetd  to perform periodic consistency
                  checks on its internal state every interval seconds.
           The syslog and filelog options are  mutually  exclusive.   If  none  is
           specified, the default is syslog using the daemon facility.  You should
           not confuse xinetd messages with messages related to  service  logging.
           The  latter  are logged only if this is specified via the configuration


           xinetd performs certain actions when it receives certain signals.   The
           actions  associated with the specific signals can be redefined by edit-
           ing config.h and recompiling.
           SIGHUP         causes a hard reconfiguration, which means  that  xinetd
                          re-reads  the  configuration  file  and  terminates  the
                          servers for  services  that  are  no  longer  available.
                          Access  control is performed again on running servers by
                          checking the remote location, access  times  and  server
                          instances. If the number of server instances is lowered,
                          some arbitrarily picked servers will be killed  to  sat-
                          isfy  the  limit; this will happen after any servers are
                          terminated because of failing  the  remote  location  or
                          access  time  checks.   Also,  if the INTERCEPT flag was
                          clear and is set, any running servers for  that  service
                          will  be  terminated;  the  purpose of this is to ensure
                          that after a hard reconfiguration there will be no  run-
                          ning servers that can accept packets from addresses that
                          do not meet the access control criteria.
           SIGQUIT        causes program termination.
           SIGTERM        terminates  all  running  servers   before   terminating
           /etc/xinetd.conf    default configuration file
                               default dump file




           Panos Tsirigotis, CS Dept, University of Colorado, Boulder Rob Braun


                                     14 June 2001                        XINETD(8)

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