晋太元中,武陵人捕鱼为业。缘溪行,忘路之远近。忽逢桃花林,夹岸数百步,中无杂树,芳草鲜美,落英缤纷。渔人甚异之,复前行,欲穷其林。 林尽水源,便得一山,山有小口,仿佛若有光。便舍船,从口入。初极狭,才通人。复行数十步,豁然开朗。土地平旷,屋舍俨然,有良田、美池、桑竹之属。阡陌交通,鸡犬相闻。其中往来种作,男女衣着,悉如外人。黄发垂髫,并怡然自乐。 见渔人,乃大惊,问所从来。具答之。便要还家,设酒杀鸡作食。村中闻有此人,咸来问讯。自云先世避秦时乱,率妻子邑人来此绝境,不复出焉,遂与外人间隔。问今是何世,乃不知有汉,无论魏晋。此人一一为具言所闻,皆叹惋。余人各复延至其家,皆出酒食。停数日,辞去。此中人语云:“不足为外人道也。”(间隔 一作:隔绝) 既出,得其船,便扶向路,处处志之。及郡下,诣太守,说如此。太守即遣人随其往,寻向所志,遂迷,不复得路。 南阳刘子骥,高尚士也,闻之,欣然规往。未果,寻病终。后遂无问津者。
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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>1.1. Description</title><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot"><link rel="home" href="Linux-PAM_MWG.html" title="The Linux-PAM Module Writers' Guide"><link rel="up" href="mwg-introduction.html" title="Chapter 1. Introduction"><link rel="prev" href="mwg-introduction.html" title="Chapter 1. Introduction"><link rel="next" href="mwg-introduction-synopsis.html" title="1.2. Synopsis"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">1.1. Description</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="mwg-introduction.html">Prev</a> </td><th width="60%" align="center">Chapter 1. Introduction</th><td width="20%" align="right"> <a accesskey="n" href="mwg-introduction-synopsis.html">Next</a></td></tr></table><hr></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="mwg-introduction-description"></a>1.1. Description</h2></div></div></div><p>
<span class="emphasis"><em>Linux-PAM</em></span> (Pluggable Authentication
Modules for Linux) is a library that enables the local system
administrator to choose how individual applications authenticate
users. For an overview of the
<span class="emphasis"><em>Linux-PAM</em></span> library see the
<span class="emphasis"><em>Linux-PAM System Administrators' Guide</em></span>.
</p><p>
A <span class="emphasis"><em>Linux-PAM</em></span> module is a single
executable binary file that can be loaded by the
<span class="emphasis"><em>Linux-PAM</em></span> interface library.
This PAM library is configured locally with a system file,
<code class="filename">/etc/pam.conf</code>, to authenticate a user
request via the locally available authentication modules. The
modules themselves will usually be located in the directory
<code class="filename">/lib/security</code> (or
<code class="filename">/lib64/security</code>, depending on the architecture)
and take the form of dynamically loadable object files (see
<span class="citerefentry"><span class="refentrytitle">dlopen</span>(3)</span>. Alternatively, the modules can be statically
linked into the <span class="emphasis"><em>Linux-PAM</em></span> library;
this is mostly to allow <span class="emphasis"><em>Linux-PAM</em></span> to
be used on platforms without dynamic linking available, but this is
a <span class="emphasis"><em>deprecated</em></span> functionality. It is the
<span class="emphasis"><em>Linux-PAM</em></span> interface that is called
by an application and it is the responsibility of the library to
locate, load and call the appropriate functions in a
<span class="emphasis"><em>Linux-PAM</em></span>-module.
</p><p>
Except for the immediate purpose of interacting with the user
(entering a password etc..) the module should never call the
application directly. This exception requires a "conversation
mechanism" which is documented below.
</p></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="mwg-introduction.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="mwg-introduction.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="mwg-introduction-synopsis.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 1. Introduction </td><td width="20%" align="center"><a accesskey="h" href="Linux-PAM_MWG.html">Home</a></td><td width="40%" align="right" valign="top"> 1.2. Synopsis</td></tr></table></div></body></html>