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<div class="section" id="module-macholib.dyld">
<span id="macholib-dyld-dyld-emulation"></span><h1><a class="reference internal" href="#module-macholib.dyld" title="macholib.dyld: Emulation of functonality of the dynamic linker"><tt class="xref py py-mod docutils literal"><span class="pre">macholib.dyld</span></tt></a> &#8212; Dyld emulation<a class="headerlink" href="#module-macholib.dyld" title="Permalink to this headline"></a></h1>
<p>This module defines a number of functions that can be used
to emulate the functionality of the dynamic linker (<tt class="docutils literal"><span class="pre">dyld</span></tt>)
w.r.t. looking for library files and framworks.</p>
<dl class="function">
<dt id="macholib.dyld.dyld_image_suffix">
<tt class="descclassname">macholib.dyld.</tt><tt class="descname">dyld_image_suffix</tt><big>(</big><span class="optional">[</span><em>env</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#macholib.dyld.dyld_image_suffix" title="Permalink to this definition"></a></dt>
<dd><p>Looks up the suffix to append to shared library and
framework names and returns this value when found.
Returns <tt class="docutils literal"><span class="pre">None</span></tt> when no suffix should be appended.</p>
<p>The <em>env</em> argument is a dictionary, which defaults
to <a class="reference external" href="http://docs.python.org/library/os.html#os.environ" title="(in Python v2.7)"><tt class="xref py py-data docutils literal"><span class="pre">os.environ</span></tt></a>.</p>
<p>See the description of <tt class="docutils literal"><span class="pre">DYLD_IMAGE_SUFFIX</span></tt> in the
manual page for dyld(1) for more information.</p>
</dd></dl>
<dl class="function">
<dt id="macholib.dyld.dydl_framework_path">
<tt class="descclassname">macholib.dyld.</tt><tt class="descname">dydl_framework_path</tt><big>(</big><span class="optional">[</span><em>env</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#macholib.dyld.dydl_framework_path" title="Permalink to this definition"></a></dt>
<dd><p>Returns a user-specified framework search path,
or an empty list when only the default search path
should be used.</p>
<p>The <em>env</em> argument is a dictionary, which defaults
to <a class="reference external" href="http://docs.python.org/library/os.html#os.environ" title="(in Python v2.7)"><tt class="xref py py-data docutils literal"><span class="pre">os.environ</span></tt></a>.</p>
<p>See the description of <tt class="docutils literal"><span class="pre">DYLD_FRAMEWORK_PATH</span></tt> in the
manual page for dyld(1) for more information.</p>
</dd></dl>
<dl class="function">
<dt id="macholib.dyld.dyld_library_path">
<tt class="descclassname">macholib.dyld.</tt><tt class="descname">dyld_library_path</tt><big>(</big><span class="optional">[</span><em>env</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#macholib.dyld.dyld_library_path" title="Permalink to this definition"></a></dt>
<dd><p>Returns a user-specified library search path,
or an empty list when only the default search path
should be used.</p>
<p>The <em>env</em> argument is a dictionary, which defaults
to <a class="reference external" href="http://docs.python.org/library/os.html#os.environ" title="(in Python v2.7)"><tt class="xref py py-data docutils literal"><span class="pre">os.environ</span></tt></a>.</p>
<p>See the description of <tt class="docutils literal"><span class="pre">DYLD_LIBRARY_PATH</span></tt> in the
manual page for dyld(1) for more information.</p>
</dd></dl>
<dl class="function">
<dt id="macholib.dyld.dyld_fallback_framework_path">
<tt class="descclassname">macholib.dyld.</tt><tt class="descname">dyld_fallback_framework_path</tt><big>(</big><span class="optional">[</span><em>env</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#macholib.dyld.dyld_fallback_framework_path" title="Permalink to this definition"></a></dt>
<dd><p>Return a user specified list of of directories where
to look for frameworks that aren&#8217;t in their install path,
or an empty list when the default fallback path should
be used.</p>
<p>The <em>env</em> argument is a dictionary, which defaults
to <a class="reference external" href="http://docs.python.org/library/os.html#os.environ" title="(in Python v2.7)"><tt class="xref py py-data docutils literal"><span class="pre">os.environ</span></tt></a>.</p>
<p>See the description of <tt class="docutils literal"><span class="pre">DYLD_FALLBACK_FRAMEWORK_PATH</span></tt> in the
manual page for dyld(1) for more information.</p>
</dd></dl>
<dl class="function">
<dt id="macholib.dyld.dyld_fallback_library_path">
<tt class="descclassname">macholib.dyld.</tt><tt class="descname">dyld_fallback_library_path</tt><big>(</big><span class="optional">[</span><em>env</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#macholib.dyld.dyld_fallback_library_path" title="Permalink to this definition"></a></dt>
<dd><p>Return a user specified list of of directories where
to look for libraries that aren&#8217;t in their install path,
or an empty list when the default fallback path should
be used.</p>
<p>The <em>env</em> argument is a dictionary, which defaults
to <a class="reference external" href="http://docs.python.org/library/os.html#os.environ" title="(in Python v2.7)"><tt class="xref py py-data docutils literal"><span class="pre">os.environ</span></tt></a>.</p>
<p>See the description of <tt class="docutils literal"><span class="pre">DYLD_FALLBACK_LIBRARY_PATH</span></tt> in the
manual page for dyld(1) for more information.</p>
</dd></dl>
<dl class="function">
<dt id="macholib.dyld.dyld_image_suffix_search">
<tt class="descclassname">macholib.dyld.</tt><tt class="descname">dyld_image_suffix_search</tt><big>(</big><em>iterator</em><span class="optional">[</span>, <em>env</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#macholib.dyld.dyld_image_suffix_search" title="Permalink to this definition"></a></dt>
<dd><p>Yields all items in <em>iterator</em>, and prepents names
with the image suffix to those items when the suffix
is specified.</p>
<p>The <em>env</em> argument is a dictionary, which defaults
to <a class="reference external" href="http://docs.python.org/library/os.html#os.environ" title="(in Python v2.7)"><tt class="xref py py-data docutils literal"><span class="pre">os.environ</span></tt></a>.</p>
</dd></dl>
<dl class="function">
<dt id="macholib.dyld.dyld_override_search">
<tt class="descclassname">macholib.dyld.</tt><tt class="descname">dyld_override_search</tt><big>(</big><em>name</em><span class="optional">[</span>, <em>env</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#macholib.dyld.dyld_override_search" title="Permalink to this definition"></a></dt>
<dd><p>If <em>name</em> is a framework name yield filesystem
paths relative to the entries in the framework
search path.</p>
<p>Always yield the filesystem paths relative to the
entries in the library search path.</p>
<p>The <em>env</em> argument is a dictionary, which defaults
to <a class="reference external" href="http://docs.python.org/library/os.html#os.environ" title="(in Python v2.7)"><tt class="xref py py-data docutils literal"><span class="pre">os.environ</span></tt></a>.</p>
</dd></dl>
<dl class="function">
<dt id="macholib.dyld.dyld_executable_path_search">
<tt class="descclassname">macholib.dyld.</tt><tt class="descname">dyld_executable_path_search</tt><big>(</big><em>name</em>, <em>executable_path</em><big>)</big><a class="headerlink" href="#macholib.dyld.dyld_executable_path_search" title="Permalink to this definition"></a></dt>
<dd><p>If <em>name</em> is a path starting with <tt class="docutils literal"><span class="pre">&#64;executable_path/</span></tt> yield
the path relative to the specified <em>executable_path</em>.</p>
<p>If <em>executable_path</em> is None nothing is yielded.</p>
</dd></dl>
<dl class="function">
<dt id="macholib.dyld.dyld_loader_search">
<tt class="descclassname">macholib.dyld.</tt><tt class="descname">dyld_loader_search</tt><big>(</big><em>name</em>, <em>loader_path</em><big>)</big><a class="headerlink" href="#macholib.dyld.dyld_loader_search" title="Permalink to this definition"></a></dt>
<dd><p>If <em>name</em> is a path starting with <tt class="docutils literal"><span class="pre">&#64;loader_path/</span></tt> yield
the path relative to the specified <em>loader_path</em>.</p>
<p>If <em>loader_path</em> is None nothing is yielded.</p>
</dd></dl>
<dl class="function">
<dt id="macholib.dyld.dyld_default_search">
<tt class="descclassname">macholib.dyld.</tt><tt class="descname">dyld_default_search</tt><big>(</big><em>name</em><span class="optional">[</span>, <em>env</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#macholib.dyld.dyld_default_search" title="Permalink to this definition"></a></dt>
<dd><p>Yield the filesystem locations to look for a dynamic
library or framework using the default locations
used by the system dynamic linker.</p>
<p>This function will look in <tt class="docutils literal"><span class="pre">~/Library/Frameworks</span></tt>
for frameworks, even though the system dynamic linker
doesn&#8217;t.</p>
<p>The <em>env</em> argument is a dictionary, which defaults
to <a class="reference external" href="http://docs.python.org/library/os.html#os.environ" title="(in Python v2.7)"><tt class="xref py py-data docutils literal"><span class="pre">os.environ</span></tt></a>.</p>
</dd></dl>
<dl class="function">
<dt id="macholib.dyld.dyld_find">
<tt class="descclassname">macholib.dyld.</tt><tt class="descname">dyld_find</tt><big>(</big><em>name</em><span class="optional">[</span>, <em>executable_path</em><span class="optional">[</span>, <em>env</em><span class="optional">[</span>, <em>loader</em><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#macholib.dyld.dyld_find" title="Permalink to this definition"></a></dt>
<dd><p>Returns the path of the requested dynamic library,
raises <tt class="xref py py-exc docutils literal"><span class="pre">ValueError</span></tt> when the library cannot be found.</p>
<p>This function searches for the library in the same
locations and de system dynamic linker.</p>
<p>The <em>executable_path</em> should be the filesystem path
of the executable to which the library is linked (either
directly or indirectly).</p>
<p>The <em>env</em> argument is a dictionary, which defaults
to <a class="reference external" href="http://docs.python.org/library/os.html#os.environ" title="(in Python v2.7)"><tt class="xref py py-data docutils literal"><span class="pre">os.environ</span></tt></a>.</p>
<p>The <em>loader_path</em> argument is an optional filesystem path for
the object file (binary of shared library) that references
<em>name</em>.</p>
<div class="versionchanged">
<p><span class="versionmodified">Changed in version 1.6: </span>Added the <em>loader_path</em> argument.</p>
</div>
</dd></dl>
<dl class="function">
<dt id="macholib.dyld.framework_find">
<tt class="descclassname">macholib.dyld.</tt><tt class="descname">framework_find</tt><big>(</big><em>fn</em><span class="optional">[</span>, <em>executable_path</em><span class="optional">[</span>, <em>env</em><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#macholib.dyld.framework_find" title="Permalink to this definition"></a></dt>
<dd><p>Find a framework using the same semantics as the
system dynamic linker, but will accept looser names
than the system linker.</p>
<p>This function will return a correct result for input
values like:</p>
<ul class="simple">
<li>Python</li>
<li>Python.framework</li>
<li>Python.framework/Versions/Current</li>
</ul>
</dd></dl>
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