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<html>
<head>
<title>chpst(8) manual page</title>
</head>
<body bgcolor='white'>
<a href='http://smarden.org/pape/'>G. Pape</a><br><a href='index.html'>runit</A><hr><p>
<h2><a name='sect0'>Name</a></h2>
chpst - runs a program with a changed process state
<h2><a name='sect1'>Synopsis</a></h2>
<b>chpst</b> [-vP012]
[-u <i>user</i>] [-U <i>user</i>] [-e <i>dir</i>] [-/ <i>root</i>] [-n <i>inc</i>] [-l|-L <i>lock</i>] [-m <i>bytes</i>] [-d <i>bytes</i>]
[-o <i>n</i>] [-p <i>n</i>] [-f <i>bytes</i>] [-c <i>bytes</i>] <i>prog</i>
<h2><a name='sect2'>Description</a></h2>
<i>prog</i> consists of one or
more arguments. <p>
<b>chpst</b> changes the process state according to the given options,
and runs <i>prog</i>.
<h2><a name='sect3'>Options</a></h2>
<dl>
<dt><b>-u <i>user[:group]</b> </i></dt>
<dd>setuidgid. Set uid and gid to the <i>user</i>’s
uid and gid. If <i>user</i> is followed by a colon and a <i>group</i>, set the gid to
<i>group</i>’s gid instead of <i>user</i>’s gid. If <i>group</i> consists of a colon-separated list
of group names, <b>chpst</b> sets the group ids of all listed groups. All initial
supplementary groups are removed. </dd>
<dt><b>-U <i>user[:group]</b> </i></dt>
<dd>envuidgid. Set the environment
variables $UID and $GID to the <i>user</i>’s uid and gid. If <i>user</i> is followed by
a colon and a <i>group</i>, set $GID to the <i>group</i>’s gid instead of <i>user</i>’s gid. </dd>
<dt><b>-e
<i>dir</b> </i></dt>
<dd>envdir. Set various environment variables as specified by files in the
directory <i>dir</i>: If <i>dir</i> contains a file named <i>k</i> whose first line is <i>v</i>, <b>chpst</b>
removes the environment variable <i>k</i> if it exists, and then adds the environment
variable <i>k</i> with the value <i>v</i>. The name <i>k</i> must not contain =. Spaces and tabs
at the end of <i>v</i> are removed, and nulls in <i>v</i> are changed to newlines. If
the file <i>k</i> is empty (0 bytes long), <b>chpst</b> removes the environment variable
<i>k</i> if it exists, without adding a new variable. </dd>
<dt><b>-/ <i>root</b> </i></dt>
<dd>chroot. Change the
root directory to <i>root</i> before starting <i>prog</i>. </dd>
<dt><b>-n <i>inc</b> </i></dt>
<dd>nice. Add <i>inc</i> to the <i><b>nice</b>(2)</i>
value before starting <i>prog</i>. <i>inc</i> must be an integer, and may start with a
minus or plus. </dd>
<dt><b>-l <i>lock</b> </i></dt>
<dd>lock. Open the file <i>lock</i> for writing, and obtain an
exclusive lock on it. <i>lock</i> will be created if it does not exist. If <i>lock</i>
is locked by another process, wait until a new lock can be obtained. </dd>
<dt><b>-L <i>lock</b>
</i></dt>
<dd>The same as -l, but fail immediately if <i>lock</i> is locked by another process.
</dd>
<dt><b>-m <i>bytes</b> </i></dt>
<dd>limit memory. Limit the data segment, stack segment, locked physical
pages, and total of all segment per process to <i>bytes</i> bytes each. </dd>
<dt><b>-d <i>bytes</b>
</i></dt>
<dd>limit data segment. Limit the data segment per process to <i>bytes</i> bytes. </dd>
<dt><b>-o
<i>n</b> </i></dt>
<dd>limit open files. Limit the number of open file descriptors per process
to <i>n</i>. </dd>
<dt><b>-p <i>n</b> </i></dt>
<dd>limit processes. Limit the number of processes per uid to <i>n</i>. </dd>
<dt><b>-f <i>bytes</b>
</i></dt>
<dd>limit output size. Limit the output file size to <i>bytes</i> bytes. </dd>
<dt><b>-c <i>bytes</b> </i></dt>
<dd>limit
core size. Limit the core file size to <i>bytes</i> bytes. </dd>
<dt><b>-v</b> </dt>
<dd>verbose. Print verbose
messages to standard error. This includes warnings about limits unsupported
by the system. </dd>
<dt><b>-P</b> </dt>
<dd>pgrphack. Run <i>prog</i> in a new process group. </dd>
<dt><b>-0</b> </dt>
<dd>Close standard
input before starting <i>prog</i>. </dd>
<dt><b>-1</b> </dt>
<dd>Close standard output before starting <i>prog</i>.
</dd>
<dt><b>-2</b> </dt>
<dd>Close standard error before starting <i>prog</i>. </dd>
</dl>
<h2><a name='sect4'>Exit Codes</a></h2>
<b>chpst</b> exits 100 when
called with wrong options. It prints an error message and exits 111 if it
has trouble changing the process state. Otherwise its exit code is the same
as that of <i>prog</i>.
<h2><a name='sect5'>Emulation</a></h2>
If <b>chpst</b> is called as <b>envdir</b>, <b>envuidgid</b>, <b>pgrphack</b>,
<b>setlock</b>, <b>setuidgid</b>, or <b>softlimit</b>, it emulates the functionality of these
programs from the daemontools package respectively.
<h2><a name='sect6'>See Also</a></h2>
<i>sv(8)</i>, <i>runsv(8)</i>,
<i>setsid(2)</i>, <i>runit(8)</i>, <i>runit-init(8)</i>, <i>runsvdir(8)</i>, <i>runsvchdir(8)</i> <p>
<i>http://smarden.org/runit/</i><br>
<i>http://cr.yp.to/daemontools.html</i><br>
<h2><a name='sect7'>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'>Options</a></li>
<li><a name='toc4' href='#sect4'>Exit Codes</a></li>
<li><a name='toc5' href='#sect5'>Emulation</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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