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>3.3. Account management</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-expected-of-module.html" title="Chapter 3. What is expected of a module"><link rel="prev" href="mwg-expected-of-module-auth.html" title="3.2. Authentication management"><link rel="next" href="mwg-expected-of-module-session.html" title="3.4. Session management"></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">3.3. Account management</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="mwg-expected-of-module-auth.html">Prev</a> </td><th width="60%" align="center">Chapter 3. What is expected of a module</th><td width="20%" align="right"> <a accesskey="n" href="mwg-expected-of-module-session.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-expected-of-module-acct"></a>3.3. Account management</h2></div></div></div><p>
        To be correctly initialized, <em class="parameter"><code>PAM_SM_ACCOUNT</code></em>
        must be <span class="command"><strong>#define</strong></span>'d prior to including
        <code class="function">&lt;security/pam_modules.h&gt;</code>. This will
        ensure that the prototypes for static modules are properly declared.
      </p><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="mwg-pam_sm_acct_mgmt"></a>3.3.1. Service function for account management</h3></div></div></div><div class="funcsynopsis"><pre class="funcsynopsisinfo">#define PAM_SM_ACCOUNT</pre><pre class="funcsynopsisinfo">#include &lt;security/pam_modules.h&gt;</pre><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int <b class="fsfunc">pam_sm_acct_mgmt</b>(</code></td><td><var class="pdparam">pamh</var>, </td><td> </td></tr><tr><td> </td><td><var class="pdparam">flags</var>, </td><td> </td></tr><tr><td> </td><td><var class="pdparam">argc</var>, </td><td> </td></tr><tr><td> </td><td><var class="pdparam">argv</var><code>)</code>;</td><td> </td></tr></table><div class="paramdef-list"><code>pam_handle_t *<var class="pdparam">pamh</var></code>;<br><code>int <var class="pdparam">flags</var></code>;<br><code>int <var class="pdparam">argc</var></code>;<br><code>const char **<var class="pdparam">argv</var></code>;</div><div class="funcprototype-spacer"> </div></div><div class="section"><div class="titlepage"><div><div><h4 class="title"><a name="mwg-pam_sm_acct_mgmt-description"></a>3.3.1.1. DESCRIPTION</h4></div></div></div><p>
      The <code class="function">pam_sm_acct_mgmt</code> function is the service
      module's implementation of the
      <span class="citerefentry"><span class="refentrytitle">pam_acct_mgmt</span>(3)</span> interface.
    </p><p>
      This function performs the task of establishing whether the user is
      permitted to gain access at this time. It should be understood that
      the user has previously been validated by an authentication
      module. This function checks for other things. Such things might be:
      the time of day or the date, the terminal line, remote hostname, etc.
      This function may also determine things like the expiration on
      passwords, and respond that the user change it before continuing.
    </p><p>
       Valid flags, which may be logically OR'd with
       <span class="emphasis"><em>PAM_SILENT</em></span>, are:
    </p><div class="variablelist"><dl class="variablelist"><dt><span class="term">PAM_SILENT</span></dt><dd><p>
             Do not emit any messages.
          </p></dd><dt><span class="term">PAM_DISALLOW_NULL_AUTHTOK</span></dt><dd><p>
            Return <span class="emphasis"><em>PAM_AUTH_ERR</em></span> if the
            database of authentication tokens for this authentication
            mechanism has a <span class="emphasis"><em>NULL</em></span> entry for the user.
          </p></dd></dl></div></div><div class="section"><div class="titlepage"><div><div><h4 class="title"><a name="mwg-pam_sm_acct_mgmt-return_values"></a>3.3.1.2. RETURN VALUES</h4></div></div></div><div class="variablelist"><dl class="variablelist"><dt><span class="term">PAM_ACCT_EXPIRED</span></dt><dd><p>
             User account has expired.
          </p></dd><dt><span class="term">PAM_AUTH_ERR</span></dt><dd><p>
            Authentication failure.
          </p></dd><dt><span class="term">PAM_NEW_AUTHTOK_REQD</span></dt><dd><p>
            The user's authentication token has expired. Before calling
            this function again the application will arrange for a new
            one to be given. This will likely result in a call to
            <code class="function">pam_sm_chauthtok()</code>.

          </p></dd><dt><span class="term">PAM_PERM_DENIED</span></dt><dd><p>
            Permission denied.
          </p></dd><dt><span class="term">PAM_SUCCESS</span></dt><dd><p>
             The authentication token was successfully updated.
          </p></dd><dt><span class="term">PAM_USER_UNKNOWN</span></dt><dd><p>
            User unknown to password service.
          </p></dd></dl></div></div></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="mwg-expected-of-module-auth.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="mwg-expected-of-module.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="mwg-expected-of-module-session.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">3.2. Authentication management </td><td width="20%" align="center"><a accesskey="h" href="Linux-PAM_MWG.html">Home</a></td><td width="40%" align="right" valign="top"> 3.4. Session management</td></tr></table></div></body></html>

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