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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>3.3. Programming notes</title><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot"><link rel="home" href="Linux-PAM_ADG.html" title="The Linux-PAM Application Developers' Guide"><link rel="up" href="adg-interface.html" title="Chapter 3.  The public interface to Linux-PAM"><link rel="prev" href="adg-interface-of-app-expected.html" title="3.2. What is expected of an application"><link rel="next" href="adg-security.html" title="Chapter 4.  Security issues of Linux-PAM"></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. Programming notes</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="adg-interface-of-app-expected.html">Prev</a> </td><th width="60%" align="center">Chapter 3. 
      The public interface to <span class="emphasis"><em>Linux-PAM</em></span>
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        Note, all of the authentication service function calls accept the
        token <span class="emphasis"><em>PAM_SILENT</em></span>, which instructs
        the modules to not send messages to the application. This token
        can be logically OR'd with any one of the permitted tokens specific
        to the individual function calls.
        <span class="emphasis"><em>PAM_SILENT</em></span> does not override the
        prompting of the user for passwords etc., it only stops informative
        messages from being generated.
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      Security issues of <span class="emphasis"><em>Linux-PAM</em></span>
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