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Rename

<!doctype html public "-//W3C//DTD HTML 4.01 Transitional//EN"
 "http://www.w3.org/TR/html4/loose.dtd">
<html> <head>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<title> Postfix manual - spawn(8) </title>
</head> <body> <pre>
SPAWN(8) SPAWN(8)

NAME
 spawn - Postfix external command spawner

SYNOPSIS
 spawn [generic Postfix daemon options] command_attributes...

DESCRIPTION
 The <a href="spawn.8.html">spawn(8)</a> daemon provides the Postfix equivalent of inetd. It lis-
 tens on a port as specified in the Postfix <a href="master.5.html">master.cf</a> 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 <a href="master.8.html">master(8)</a> process manager.

COMMAND ATTRIBUTE SYNTAX
 The external command attributes are given in the <a href="master.5.html">master.cf</a> 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 speci-
 fied 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 username.

argv=command... (required)
 The command to be executed. This must be specified as the last
 command attribute. The command is executed directly, i.e. with-
 out interpretation of shell meta characters by a shell command
 interpreter.

BUGS
 In order to enforce standard Postfix process resource controls, the
 <a href="spawn.8.html">spawn(8)</a> daemon runs only one external command at a time. As such, it
 presents a noticeable overhead by wasting precious process resources.
 The <a href="spawn.8.html">spawn(8)</a> daemon is expected to be replaced by a more structural
 solution.

DIAGNOSTICS
 The <a href="spawn.8.html">spawn(8)</a> 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 security sensitive. However the
 <a href="spawn.8.html">spawn(8)</a> daemon does not talk to the external command and thus is not
 vulnerable to data-driven attacks.

CONFIGURATION PARAMETERS
 Changes to <a href="postconf.5.html">main.cf</a> are picked up automatically as <a href="spawn.8.html">spawn(8)</a> processes
 run for only a limited amount of time. Use the command "postfix reload"
 to speed up a change.

The text below provides only a parameter summary. See <a href="postconf.5.html">postconf(5)</a> for
 more details including examples.

In the text below, transport is the first field of the entry in the
 <a href="master.5.html">master.cf</a> file.

RESOURCE AND RATE CONTROL
 <a href="postconf.5.html#transport_time_limit">transport_time_limit</a> ($<a href="postconf.5.html#command_time_limit">command_time_limit</a>)
 The amount of time the command is allowed to run before it is
 terminated.

Postfix 2.4 and later support a suffix that specifies  the  time
              unit:  s (seconds), m (minutes), h (hours), d (days), w (weeks).
              The default time unit is seconds.

MISCELLANEOUS
 <a href="postconf.5.html#config_directory">config_directory</a> (see 'postconf -d' output)
 The default location of the Postfix <a href="postconf.5.html">main.cf</a> and <a href="master.5.html">master.cf</a> con-
 figuration files.

<a href="postconf.5.html#daemon_timeout">daemon_timeout</a> (18000s)
 How much time a Postfix daemon process may take to handle a
 request before it is terminated by a built-in watchdog timer.

<a href="postconf.5.html#export_environment">export_environment</a> (see 'postconf -d' output)
 The list of environment variables that a Postfix process will
 export to non-Postfix processes.

<a href="postconf.5.html#ipc_timeout">ipc_timeout</a> (3600s)
 The time limit for sending or receiving information over an
 internal communication channel.

<a href="postconf.5.html#mail_owner">mail_owner</a> (postfix)
 The UNIX system account that owns the Postfix queue and most
 Postfix daemon processes.

<a href="postconf.5.html#max_idle">max_idle</a> (100s)
 The maximum amount of time that an idle Postfix daemon process
 waits for an incoming connection before terminating voluntarily.

<a href="postconf.5.html#max_use">max_use</a> (100)
 The maximal number of incoming connections that a Postfix daemon
 process will service before terminating voluntarily.

<a href="postconf.5.html#process_id">process_id</a> (read-only)
 The process ID of a Postfix command or daemon process.

<a href="postconf.5.html#process_name">process_name</a> (read-only)
 The process name of a Postfix command or daemon process.

<a href="postconf.5.html#queue_directory">queue_directory</a> (see 'postconf -d' output)
 The location of the Postfix top-level queue directory.

<a href="postconf.5.html#syslog_facility">syslog_facility</a> (mail)
 The syslog facility of Postfix logging.

<a href="postconf.5.html#syslog_name">syslog_name</a> (see 'postconf -d' output)
 The mail system name that is prepended to the process name in
 syslog records, so that "smtpd" becomes, for example, "post-
 fix/smtpd".

SEE ALSO
 <a href="postconf.5.html">postconf(5)</a>, configuration parameters
 <a href="master.8.html">master(8)</a>, 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

Wietse Venema
       Google, Inc.
       111 8th Avenue
       New York, NY 10011, USA

SPAWN(8)
</pre> </body> </html>