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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> [-vVP012]
[-u <i>user</i>] [-U <i>user</i>] [-b <i>argv0</i>] [-e <i>dir</i>] [-/ <i>root</i>] [-C <i>pwd</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>] [-t <i>seconds</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, as found in <i>/etc/passwd</i>. If <i>user</i> is followed by a colon
and a <i>group</i>, set the gid to <i>group</i>’s gid, as found in <i>/etc/group</i>, 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. If <i>user</i> is prefixed with
a colon, the <i>user</i> and all <i>group</i> arguments are interpreted as uid and gids
respectively, and not looked up in the password or group file. 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, as found in <i>/etc/passwd</i>.
If <i>user</i> is followed by a colon and a <i>group</i>, set $GID to the <i>group</i>’s gid,
as found in <i>/etc/group</i>, instead of <i>user</i>’s gid. If <i>user</i> is prefixed with a
colon, the <i>user</i> and <i>group</i> arguments are interpreted as uid and gid respectively,
and not looked up in the password or group file. </dd>
<dt><b>-b <i>argv0</b> </i></dt>
<dd>argv0. Run <i>prog</i>
with <i>argv0</i> as the 0th argument. </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>-C <i>pwd</b> </i></dt>
<dd>chdir. Change the working directory to
<i>pwd</i> before starting <i>prog</i>.
When combined with -/, the working directory is changed after the chroot. </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>-t <i>seconds</b> </i></dt>
<dd>limit CPU time. Limit CPU time to <i>seconds</i> seconds, delivering a SIGXCPU thereafter.</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>-V</b> </dt>
<dd>version string. Print a version string to standard error. </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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