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spawn



SYNOPSIS

       spawn [generic Postfix daemon options] command_attributes...


DESCRIPTION

       The spawn daemon provides the Postfix equivalent of inetd.
       It listens on a port as specified in the Postfix master.cf
       file  and spawns an external command whenever a connection
       is established.  The connection can be made over local IPC
       (such  as UNIX-domain sockets) or over non-local IPC (such
       as TCP sockets).  The command´s standard input, output and
       error  streams are connected directly to the communication
       endpoint.

       This daemon expects to be run from the  master(8)  process
       manager.


COMMAND ATTRIBUTE SYNTAX

       The external command attributes are given in the master.cf
       file at the end of a service definition.  The syntax is as
       follows:

       user=username (required)

       user=username:groupname
              The external command is executed with the rights of
              the specified username.  The  software  refuses  to
              execute  commands with root privileges, or with the
              privileges of the mail system owner.  If  groupname
              is  specified,  the  corresponding group ID is used
              instead of the group ID of of username.

       argv=command... (required)
              The command to be executed. This must be  specified
              as the last command attribute.  The command is exe­
              cuted  directly,  i.e.  without  interpretation  of
              shell  meta  characters  by  a shell command inter­
              preter.


BUGS

       In order to enforce standard Postfix process resource con­
       trols,  the spawn daemon runs only one external command at
       a time.  As such, it presents  a  noticeable  overhead  by
       wasting  precious  process  resources. The spawn daemon is
       expected to be replaced by a more structural solution.


DIAGNOSTICS

       The spawn daemon reports abnormal child  exits.   Problems
       are logged to syslogd(8).


SECURITY

       This  program  needs  root  privilege  in order to execute
       external commands as the specified user. It  is  therefore

       mail_owner
              The  process  privileges  used while not running an
              external command.


Resource control

       service_time_limit
              The amount of time the command is  allowed  to  run
              before  it  is  killed  with  force. service is the
              first field of the entry in the master.cf file. The
              default  time  limit  is  given  by the global com­
              mand_time_limit configuration parameter.


SEE ALSO

       master(8) process manager
       syslogd(8) system logging


LICENSE

       The Secure Mailer license must be  distributed  with  this
       software.


AUTHOR(S)

       Wietse Venema
       IBM T.J. Watson Research
       P.O. Box 704
       Yorktown Heights, NY 10598, USA

                                                         SPAWN(8)
  

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