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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>] [-l|-L <i>lock</i>] [-m <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. All 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>-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>-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 <i><b>envdir</b>(8)</i>,
<i><b>envuidgid</b>(8)</i>, <i><b>pgrphack</b>(8)</i>, <i><b>setlock</b>(8)</i>, <i><b>setuidgid</b>(8)</i>, or <i><b>softlimit</b>(8)</i>, it
emulates the functionality of these programs from the daemontools package
respectively.
<h2><a name='sect6'>See Also</a></h2>
<i>runsv(8)</i>, <i>runsvctrl(8)</i>, <i>runsvstat(8)</i>, <i>runsvdir(8)</i>,
<i>setsid(2)</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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