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<b>spawn</b> [generic Postfix daemon options] command_attributes...
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The <b>spawn</b> daemon provides the Postfix equivalent of <b>inetd</b>.
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It listens on a port as specified in the Postfix <b>master.cf</b>
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file and spawns an external command whenever a connection
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is established. The connection can be made over local IPC
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(such as UNIX-domain sockets) or over non-local IPC (such
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as TCP sockets). The command's standard input, output and
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error streams are connected directly to the communication
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The <a href="spawn.8.html"><b>spawn</b>(8)</a> daemon provides the Postfix equivalent of
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<b>inetd</b>. It listens on a port as specified in the Postfix
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<b>master.cf</b> file and spawns an external command whenever a
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connection is established. The connection can be made
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over local IPC (such as UNIX-domain sockets) or over non-
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local IPC (such as TCP sockets). The command's standard
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input, output and error streams are connected directly to
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the communication endpoint.
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This daemon expects to be run from the <a href="master.8.html"><b>master</b>(8)</a> process
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execute commands with root privileges, or with the
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privileges of the mail system owner. If <i>groupname</i>
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is specified, the corresponding group ID is used
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instead of the group ID of of <i>username</i>.
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instead of the group ID of <i>username</i>.
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<b>argv</b>=<i>command</i>... (required)
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The command to be executed. This must be specified
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In order to enforce standard Postfix process resource con-
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trols, the <b>spawn</b> daemon runs only one external command at
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a time. As such, it presents a noticeable overhead by
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wasting precious process resources. The <b>spawn</b> daemon is
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trols, the <a href="spawn.8.html"><b>spawn</b>(8)</a> daemon runs only one external command
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at a time. As such, it presents a noticeable overhead by
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wasting precious process resources. The <a href="spawn.8.html"><b>spawn</b>(8)</a> daemon is
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expected to be replaced by a more structural solution.
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The <b>spawn</b> daemon reports abnormal child exits. Problems
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are logged to <b>syslogd</b>(8).
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The <a href="spawn.8.html"><b>spawn</b>(8)</a> daemon reports abnormal child exits. Prob-
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lems are logged to <b>syslogd</b>(8).
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This program needs root privilege in order to execute
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external commands as the specified user. It is therefore
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security sensitive. However the <b>spawn</b> daemon does not
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security sensitive. However the <a href="spawn.8.html"><b>spawn</b>(8)</a> daemon does not
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talk to the external command and thus is not vulnerable to
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data-driven attacks.
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<b>CONFIGURATION PARAMETERS</b>
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Changes to <b>main.cf</b> are picked up automatically as <a href="spawn.8.html">spawn(8)</a>
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Changes to <b>main.cf</b> are picked up automatically as <a href="spawn.8.html"><b>spawn</b>(8)</a>
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processes run for only a limited amount of time. Use the
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command "<b>postfix reload</b>" to speed up a change.
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The text below provides only a parameter summary. See
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<a href="postconf.5.html">postconf(5)</a> for more details including examples.
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<a href="postconf.5.html"><b>postconf</b>(5)</a> for more details including examples.
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In the text below, <i>transport</i> is the first field of the
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entry in the <b>master.cf</b> file.
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Postfix daemon process terminates.
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<b><a href="postconf.5.html#process_id">process_id</a> (read-only)</b>
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The process ID of a Postfix command or daemon pro-
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The process ID of a Postfix command or daemon
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<b><a href="postconf.5.html#process_name">process_name</a> (read-only)</b>
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The process name of a Postfix command or daemon
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The syslog facility of Postfix logging.
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<b><a href="postconf.5.html#syslog_name">syslog_name</a> (postfix)</b>
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The mail system name that is prepended to the pro-
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cess name in syslog records, so that "smtpd"
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The mail system name that is prepended to the
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process name in syslog records, so that "smtpd"
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becomes, for example, "postfix/smtpd".
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