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diff --git a/man/limits.5.xml b/man/limits.5.xml new file mode 100644 index 0000000..0b459bc --- /dev/null +++ b/man/limits.5.xml @@ -0,0 +1,195 @@ +<?xml version="1.0" encoding="UTF-8"?> +<!-- + SPDX-FileCopyrightText: 1997 , Luca Berra + SPDX-FileCopyrightText: 2001 - 2007, Tomasz Kłoczko + SPDX-FileCopyrightText: 2005 - 2006, Yuri Kozlov + SPDX-FileCopyrightText: 2005 - 2008, Nicolas François + SPDX-License-Identifier: BSD-3-Clause +--> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook V4.5//EN" + "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [ +<!-- SHADOW-CONFIG-HERE --> +]> +<refentry id='limits.5'> + <!-- $Id$ --> + <refentryinfo> + <author> + <firstname>Luca</firstname> + <surname>Berra</surname> + <contrib>Creation, 1997</contrib> + </author> + <author> + <firstname>Thomas</firstname> + <surname>Kłoczko</surname> + <email>kloczek@pld.org.pl</email> + <contrib>shadow-utils maintainer, 2000 - 2007</contrib> + </author> + <author> + <firstname>Nicolas</firstname> + <surname>François</surname> + <email>nicolas.francois@centraliens.net</email> + <contrib>shadow-utils maintainer, 2007 - now</contrib> + </author> + </refentryinfo> + <refmeta> + <refentrytitle>limits</refentrytitle> + <manvolnum>5</manvolnum> + <refmiscinfo class="sectdesc">File Formats and Configuration Files</refmiscinfo> + <refmiscinfo class="source">shadow-utils</refmiscinfo> + <refmiscinfo class="version">&SHADOW_UTILS_VERSION;</refmiscinfo> + </refmeta> + <refnamediv id='name'> + <refname>limits</refname> + <refpurpose>resource limits definition</refpurpose> + </refnamediv> + <!-- body begins here --> + + <refsect1 id='description'> + <title>DESCRIPTION</title> + <para> + The <emphasis remap='I'>limits</emphasis> file + (<filename>/etc/limits</filename> by default + or LIMITS_FILE defined <filename>config.h</filename>) describes + the resource limits you wish to impose. It should be owned by + root and readable by root account only. + </para> + + <para> + By default no quota is imposed on 'root'. In fact, there is no way to + impose limits via this procedure to root-equiv accounts (accounts with + UID 0). + </para> + + <para>Each line describes a limit for a user in the form:</para> + + <para> + <emphasis remap='I'>user LIMITS_STRING</emphasis> + </para> + + <para>or in the form:</para> + + <para> + <emphasis remap='I'>@group LIMITS_STRING</emphasis> + </para> + + <para> + The <emphasis>LIMITS_STRING</emphasis> is a string of a concatenated + list of resource limits. Each limit consists of a letter identifier + followed by a numerical limit. + </para> + + <para>The valid identifiers are:</para> + + <itemizedlist> + <listitem><para>A: max address space (KB)</para></listitem> + <listitem><para>C: max core file size (KB)</para></listitem> + <listitem><para>D: max data size (KB)</para></listitem> + <listitem><para>F: maximum file size (KB)</para></listitem> + <listitem><para>K: file creation mask, set by + <citerefentry> + <refentrytitle>umask</refentrytitle><manvolnum>2</manvolnum> + </citerefentry>.</para> + </listitem> + <listitem><para>I: max nice value (0..39 which translates to + 20..-19)</para></listitem> + <listitem><para>L: max number of logins for this user</para></listitem> + <listitem><para>M: max locked-in-memory address space (KB)</para></listitem> + <listitem><para>N: max number of open files</para></listitem> + <listitem><para>O: max real time priority</para></listitem> + <listitem><para>P: process priority, set by + <citerefentry> + <refentrytitle>setpriority</refentrytitle><manvolnum>2</manvolnum> + </citerefentry>.</para> + </listitem> + <listitem><para>R: max resident set size (KB)</para></listitem> + <listitem><para>S: max stack size (KB)</para></listitem> + <listitem><para>T: max CPU time (MIN)</para></listitem> + <listitem><para>U: max number of processes</para></listitem> + </itemizedlist> + + <para> + For example, <emphasis remap='I'>L2D2048N5</emphasis> is a valid + <emphasis>LIMITS_STRING</emphasis>. For reading convenience, the + following entries are equivalent: + </para> + + <programlisting> + username L2D2048N5 + username L2 D2048 N5 + </programlisting> + + <para> + Be aware that after <emphasis remap='I'>username</emphasis> the rest + of the line is considered a limit string, thus comments are not + allowed. An invalid limits string will be rejected (not considered) by + the <command>login</command> program. + </para> + + <para> + The default entry is denoted by username "<emphasis>*</emphasis>". If + you have multiple <emphasis remap='I'>default</emphasis> entries in + your <emphasis>LIMITS_FILE</emphasis>, then the last one will be used + as the default entry. + </para> + + <para> + The limits specified in the form "<replaceable>@group</replaceable>" + apply to the members of the specified + <replaceable>group</replaceable>. + </para> + + <para> + If more than one line with limits for a user exist, only the first line for + this user will be considered. + </para> + + <para> + If no lines are specified for a user, the last + <replaceable>@group</replaceable> line matching a group whose the + user is a member of will be considered, or the last line with + default limits if no groups contain the user. + </para> + + <para> + To completely disable limits for a user, a single dash + "<emphasis>-</emphasis>" will do. + </para> + + <para> + To disable a limit for a user, a single dash + "<replaceable>-</replaceable>" can be used instead of the numerical + value for this limit. + </para> + + <para> + Also, please note that all limit settings are set PER LOGIN. They are + not global, nor are they permanent. Perhaps global limits will come, + but for now this will have to do ;) + </para> + </refsect1> + + <refsect1 id='files'> + <title>FILES</title> + <variablelist> + <varlistentry> + <term><filename>/etc/limits</filename></term> + <listitem><para></para></listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id='see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>login</refentrytitle><manvolnum>1</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>setpriority</refentrytitle><manvolnum>2</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>setrlimit</refentrytitle><manvolnum>2</manvolnum> + </citerefentry>. + </para> + </refsect1> +</refentry> |