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[OpenSPARC-T2-SAM] / sam-t2 / devtools / amd64 / html / python / lib / module-dl.html
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55<H1><A NAME="SECTION0010500000000000000000">
568.5 <tt class="module">dl</tt> --
57 Call C functions in shared objects</A>
58</H1>
59<A NAME="module-dl"></A>
60<p class="availability">Availability: <span
61 class="platform">Unix</span>.</p>
62
63<P>
64The <tt class="module">dl</tt> module defines an interface to the
65<tt class="cfunction">dlopen()</tt> function, which is the most common interface on
66<span class="Unix">Unix</span> platforms for handling dynamically linked libraries. It allows
67the program to call arbitrary functions in such a library.
68
69<P>
70<span class="note"><b class="label">Note:</b>
71This module will not work unless
72<code>sizeof(int) == sizeof(long) == sizeof(char *)</code>
73If this is not the case, <tt class="exception">SystemError</tt> will be raised on
74import.</span>
75
76<P>
77The <tt class="module">dl</tt> module defines the following function:
78
79<P>
80<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
81 <td><nobr><b><tt id='l2h-2988' xml:id='l2h-2988' class="function">open</tt></b>(</nobr></td>
82 <td><var>name</var><big>[</big><var>, mode<code> = RTLD_LAZY</code></var><big>]</big><var></var>)</td></tr></table></dt>
83<dd>
84Open a shared object file, and return a handle. Mode
85signifies late binding (<tt class="constant">RTLD_LAZY</tt>) or immediate binding
86(<tt class="constant">RTLD_NOW</tt>). Default is <tt class="constant">RTLD_LAZY</tt>. Note that some
87systems do not support <tt class="constant">RTLD_NOW</tt>.
88
89<P>
90Return value is a dlobject.
91</dl>
92
93<P>
94The <tt class="module">dl</tt> module defines the following constants:
95
96<P>
97<dl><dt><b><tt id='l2h-2989' xml:id='l2h-2989'>RTLD_LAZY</tt></b></dt>
98<dd>
99Useful as an argument to <tt class="function">open()</tt>.
100</dd></dl>
101
102<P>
103<dl><dt><b><tt id='l2h-2990' xml:id='l2h-2990'>RTLD_NOW</tt></b></dt>
104<dd>
105Useful as an argument to <tt class="function">open()</tt>. Note that on systems
106which do not support immediate binding, this constant will not appear
107in the module. For maximum portability, use <tt class="function">hasattr()</tt> to
108determine if the system supports immediate binding.
109</dd></dl>
110
111<P>
112The <tt class="module">dl</tt> module defines the following exception:
113
114<P>
115<dl><dt><b><span class="typelabel">exception</span>&nbsp;<tt id='l2h-2991' xml:id='l2h-2991' class="exception">error</tt></b></dt>
116<dd>
117Exception raised when an error has occurred inside the dynamic loading
118and linking routines.
119</dd></dl>
120
121<P>
122Example:
123
124<P>
125<div class="verbatim"><pre>
126&gt;&gt;&gt; import dl, time
127&gt;&gt;&gt; a=dl.open('/lib/libc.so.6')
128&gt;&gt;&gt; a.call('time'), time.time()
129(929723914, 929723914.498)
130</pre></div>
131
132<P>
133This example was tried on a Debian GNU/Linux system, and is a good
134example of the fact that using this module is usually a bad alternative.
135
136<P>
137
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183<span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span>
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