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<html>
<head>
<title>runsv(8) manual page</title>
</head>
<body bgcolor='white'>
<a href='#toc'>Table of Contents</a><p>
<h2><a name='sect0' href='#toc0'>Name</a></h2>
runsv - starts and monitors a service and optionally an appendant log
service
<h2><a name='sect1' href='#toc1'>Synopsis</a></h2>
<b>runsv</b> <i>service</i>
<h2><a name='sect2' href='#toc2'>Description</a></h2>
<i>service</i> must be a directory. <p>
<b>runsv</b>
switches to the directory <i>service</i> and starts ./run. if ./run exits and ./finish
exists, <b>runsv</b> starts ./finish. If ./finish doesn’t exist or ./finish exits,
<b>runsv</b> restarts ./run. <p>
If ./run or ./finish exit immediately, <b>runsv</b> waits a
second before starting ./finish or restarting ./run. <p>
If the file <i>service</i>/down
exists, <b>runsv</b> does not start ./run immediately. The control interface (see
below) can be used to start the service and to give other commands to <b>runsv</b>.
<p>
If the directory <i>service</i>/log exists, <b>runsv</b> creates a pipe, redirects <i>service</i>/run’s
and <i>service</i>/finish’s standard output to the pipe, switches to the directory
<i>service</i>/log and starts ./run (and ./finish) exactly as described above for
the <i>service</i> directory. The standard input of the log service a redirected
to read from the pipe. <p>
<b>runsv</b> maintains status information in a binary format
compatible to <i><b>supervise</b>(8)</i> in <i>service</i>/supervise/status and <i>service</i>/log/supervise/status,
and in a human-readable format in <i>service</i>/supervise/stat, <i>service</i>/log/supervise/stat,
<i>service</i>/supervise/pid, <i>service</i>/log/supervise/pid.
<h2><a name='sect3' href='#toc3'>Control</a></h2>
The named pipes
<i>service</i>/supervise/control, and (optionally) <i>service</i>/log/supervise/control
are provided to give commands to <b>runsv</b>. You can use <i><b>svc</b>(8)</i> to control the
service or just write one of the following characters to the named pipe:
<dl>
<dt><b>u</b> </dt>
<dd>Up. If the service is not running, start it. If the service stops, restart
it. </dd>
<dt><b>d</b> </dt>
<dd>Down. If the service is running, send it a TERM signal. If ./run exits,
start ./finish if it exists. After it stops, do not restart service. </dd>
<dt><b>o</b> </dt>
<dd>Once.
If the service is not running, start it. Do not restart it if it stops. </dd>
<dt><b>p</b>
</dt>
<dd>Pause. If the service is running, send it a STOP signal. </dd>
<dt><b>c</b> </dt>
<dd>Continue. If the
service is running, send it a CONT signal. </dd>
<dt><b>h</b> </dt>
<dd>Hangup. If the service is running,
send it a HUP signal. </dd>
<dt><b>a</b> </dt>
<dd>Alarm. If the service is running, send it a ALRM
signal. </dd>
<dt><b>i</b> </dt>
<dd>Interrupt. If the service is running, send it a INT signal.
<dt><b>1</b> </dt>
<dd>User-defined 1. If the service is running, send it a USR1 signal. </dd>
<dt><b>2</b> </dt>
<dd>User-defined 2. If the service is running, send it a USR2 signal. </dd>
<dt><b>t</b> </dt>
<dd>Terminate. If the service is
running, send it a TERM signal. </dd>
<dt><b>k</b> </dt>
<dd>Kill. If the service is running, send it
a KILL signal. </dd>
<dt><b>x or <b>e</b> </b></dt>
<dd>Exit. If the service is running, send it a TERM signal.
Do not restart the service. If the service is down, and no log service exists,
<b>runsv</b> exits. If the service is down and a log service exists, <b>runsv</b> closes
the standard input of the log service, and waits for it to terminate. If
the log service is down, <b>runsv</b> exits. This command is ignored if it is given
to <i>service</i>/log/supervise/control. </dd>
</dl>
<p>
For example, to send a TERM signal to
/service/socklog-unix, either do # svc -t /service/socklog-unix<br>
or<br>
# echo -n t >/service/socklog-unix/supervise/control<br>
<p>
If <i><b>echo</b>(1)</i> on your systems does not provide the -n option, leave it out,
<b>runsv</b> ignores unknown characters written to the control pipe. <i><b>echo</b>(1)</i> usually
blocks if no <b>runsv</b> process is running in the service directory.
<h2><a name='sect4' href='#toc4'>Signals</a></h2>
If
<b>runsv</b> receives a TERM signal, it acts as if the character x was written
to the control pipe.
<h2><a name='sect5' href='#toc5'>Exit Codes</a></h2>
<b>runsv</b> exits 111 on an error on startup or
if another <b>runsv</b> is running in <i>service</i>. <p>
<b>runsv</b> exits 0 if it was told to
exit.
<h2><a name='sect6' href='#toc6'>See Also</a></h2>
<i>runsvctrl(8)</i>, <i>runsvstat(8)</i>, <i>runit(8)</i>, <i>runit-init(8)</i>, <i>runsvdir(8)</i>,
<i>runsvchdir(8)</i>, <i>svlogd(8)</i>, <i>svwaitdown(8)</i>, <i>svwaitup(8)</i>, <i>svc(8)</i>, <i>supervise(8)</i>
<p>
<i>http://smarden.org/runit/</i><br>
<i>http://cr.yp.to/daemontools.html</i><br>
<h2><a name='sect7' href='#toc7'>Author</a></h2>
Gerrit Pape <pape@smarden.org> <p>
<hr><p>
<a name='toc'><b>Table of Contents</b></a><p>
<ul>
<li><a name='toc0' href='#sect0'>Name</a></li>
<li><a name='toc1' href='#sect1'>Synopsis</a></li>
<li><a name='toc2' href='#sect2'>Description</a></li>
<li><a name='toc3' href='#sect3'>Control</a></li>
<li><a name='toc4' href='#sect4'>Signals</a></li>
<li><a name='toc5' href='#sect5'>Exit Codes</a></li>
<li><a name='toc6' href='#sect6'>See Also</a></li>
<li><a name='toc7' href='#sect7'>Author</a></li>
</ul>
</body>
</html>
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