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<title>Debugging with GDB: Inferiors In Python</title>
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<a name="Inferiors-In-Python"></a>
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<div class="header">
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<p>
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Next: <a href="Events-In-Python.html#Events-In-Python" accesskey="n" rel="next">Events In Python</a>, Previous: <a href="Writing-an-Xmethod.html#Writing-an-Xmethod" accesskey="p" rel="previous">Writing an Xmethod</a>, Up: <a href="Python-API.html#Python-API" accesskey="u" rel="up">Python API</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
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<a name="Inferiors-In-Python-1"></a>
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<h4 class="subsubsection">23.2.2.16 Inferiors In Python</h4>
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<a name="index-inferiors-in-Python"></a>
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<a name="index-gdb_002eInferior"></a>
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<p>Programs which are being run under <small>GDB</small> are called inferiors
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(see <a href="Inferiors-Connections-and-Programs.html#Inferiors-Connections-and-Programs">Inferiors Connections and Programs</a>). Python scripts can access
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information about and manipulate inferiors controlled by <small>GDB</small>
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via objects of the <code>gdb.Inferior</code> class.
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</p>
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<p>The following inferior-related functions are available in the <code>gdb</code>
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module:
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</p>
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<dl>
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<dt><a name="index-gdb_002einferiors"></a>Function: <strong>gdb.inferiors</strong> <em>()</em></dt>
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<dd><p>Return a tuple containing all inferior objects.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gdb_002eselected_005finferior"></a>Function: <strong>gdb.selected_inferior</strong> <em>()</em></dt>
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<dd><p>Return an object representing the current inferior.
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</p></dd></dl>
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<p>A <code>gdb.Inferior</code> object has the following attributes:
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</p>
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<dl>
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<dt><a name="index-Inferior_002enum"></a>Variable: <strong>Inferior.num</strong></dt>
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<dd><p>ID of inferior, as assigned by GDB.
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</p></dd></dl>
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<dl>
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<dt><a name="index-Inferior_002epid"></a>Variable: <strong>Inferior.pid</strong></dt>
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<dd><p>Process ID of the inferior, as assigned by the underlying operating
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system.
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</p></dd></dl>
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<dl>
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<dt><a name="index-Inferior_002ewas_005fattached"></a>Variable: <strong>Inferior.was_attached</strong></dt>
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<dd><p>Boolean signaling whether the inferior was created using ‘attach’, or
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started by <small>GDB</small> itself.
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</p></dd></dl>
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<dl>
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<dt><a name="index-Inferior_002eprogspace"></a>Variable: <strong>Inferior.progspace</strong></dt>
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<dd><p>The inferior’s program space. See <a href="Progspaces-In-Python.html#Progspaces-In-Python">Progspaces In Python</a>.
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</p></dd></dl>
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<p>A <code>gdb.Inferior</code> object has the following methods:
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</p>
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<dl>
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<dt><a name="index-Inferior_002eis_005fvalid"></a>Function: <strong>Inferior.is_valid</strong> <em>()</em></dt>
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<dd><p>Returns <code>True</code> if the <code>gdb.Inferior</code> object is valid,
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<code>False</code> if not. A <code>gdb.Inferior</code> object will become invalid
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if the inferior no longer exists within <small>GDB</small>. All other
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<code>gdb.Inferior</code> methods will throw an exception if it is invalid
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at the time the method is called.
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</p></dd></dl>
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<dl>
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<dt><a name="index-Inferior_002ethreads"></a>Function: <strong>Inferior.threads</strong> <em>()</em></dt>
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<dd><p>This method returns a tuple holding all the threads which are valid
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when it is called. If there are no valid threads, the method will
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return an empty tuple.
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</p></dd></dl>
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<dl>
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<dt><a name="index-Inferior_002earchitecture"></a>Function: <strong>Inferior.architecture</strong> <em>()</em></dt>
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<dd><p>Return the <code>gdb.Architecture</code> (see <a href="Architectures-In-Python.html#Architectures-In-Python">Architectures In Python</a>)
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for this inferior. This represents the architecture of the inferior
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as a whole. Some platforms can have multiple architectures in a
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single address space, so this may not match the architecture of a
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particular frame (see <a href="Frames-In-Python.html#Frames-In-Python">Frames In Python</a>).
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</p></dd></dl>
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<a name="index-Inferior_002eread_005fmemory"></a>
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<dl>
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<dt><a name="index-Inferior_002eread_005fmemory-1"></a>Function: <strong>Inferior.read_memory</strong> <em>(address, length)</em></dt>
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<dd><p>Read <var>length</var> addressable memory units from the inferior, starting at
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<var>address</var>. Returns a buffer object, which behaves much like an array
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or a string. It can be modified and given to the
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<code>Inferior.write_memory</code> function. In Python 3, the return
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value is a <code>memoryview</code> object.
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</p></dd></dl>
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<a name="index-Inferior_002ewrite_005fmemory"></a>
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<dl>
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<dt><a name="index-Inferior_002ewrite_005fmemory-1"></a>Function: <strong>Inferior.write_memory</strong> <em>(address, buffer <span class="roman">[</span>, length<span class="roman">]</span>)</em></dt>
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<dd><p>Write the contents of <var>buffer</var> to the inferior, starting at
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<var>address</var>. The <var>buffer</var> parameter must be a Python object
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which supports the buffer protocol, i.e., a string, an array or the
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object returned from <code>Inferior.read_memory</code>. If given, <var>length</var>
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determines the number of addressable memory units from <var>buffer</var> to be
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written.
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</p></dd></dl>
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<a name="index-gdb_002esearch_005fmemory"></a>
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<dl>
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<dt><a name="index-Inferior_002esearch_005fmemory"></a>Function: <strong>Inferior.search_memory</strong> <em>(address, length, pattern)</em></dt>
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<dd><p>Search a region of the inferior memory starting at <var>address</var> with
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the given <var>length</var> using the search pattern supplied in
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<var>pattern</var>. The <var>pattern</var> parameter must be a Python object
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which supports the buffer protocol, i.e., a string, an array or the
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object returned from <code>gdb.read_memory</code>. Returns a Python <code>Long</code>
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containing the address where the pattern was found, or <code>None</code> if
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the pattern could not be found.
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</p></dd></dl>
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<a name="index-Inferior_002ethread_005ffrom_005fhandle"></a>
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<a name="index-Inferior_002ethread_005ffrom_005fthread_005fhandle"></a>
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<dl>
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<dt><a name="index-Inferior_002ethread_005ffrom_005fhandle-1"></a>Function: <strong>Inferior.thread_from_handle</strong> <em>(handle)</em></dt>
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<dd><p>Return the thread object corresponding to <var>handle</var>, a thread
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library specific data structure such as <code>pthread_t</code> for pthreads
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library implementations.
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</p>
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<p>The function <code>Inferior.thread_from_thread_handle</code> provides
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the same functionality, but use of <code>Inferior.thread_from_thread_handle</code>
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is deprecated.
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</p></dd></dl>
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<div class="header">
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<p>
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Next: <a href="Events-In-Python.html#Events-In-Python" accesskey="n" rel="next">Events In Python</a>, Previous: <a href="Writing-an-Xmethod.html#Writing-an-Xmethod" accesskey="p" rel="previous">Writing an Xmethod</a>, Up: <a href="Python-API.html#Python-API" accesskey="u" rel="up">Python API</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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