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 <a name="Events-In-Python"></a>
 <div class="header">
 <p>
 Next: <a href="Threads-In-Python.html#Threads-In-Python" accesskey="n" rel="next">Threads In Python</a>, Previous: <a href="Inferiors-In-Python.html#Inferiors-In-Python" accesskey="p" rel="prev">Inferiors In Python</a>, Up: <a href="Python-API.html#Python-API" accesskey="u" rel="up">Python API</a> &nbsp; [<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>
 </div>
 <hr>
 <a name="Events-In-Python-1"></a>
 <h4 class="subsubsection">23.2.2.17 Events In Python</h4>
 <a name="index-inferior-events-in-Python"></a>

 <p><small>GDB</small> provides a general event facility so that Python code can be
 notified of various state changes, particularly changes that occur in
 the inferior.
 </p>
 <p>An <em>event</em> is just an object that describes some state change.  The
 type of the object and its attributes will vary depending on the details
 of the change.  All the existing events are described below.
 </p>
 <p>In order to be notified of an event, you must register an event handler
 with an <em>event registry</em>.  An event registry is an object in the
 <code>gdb.events</code> module which dispatches particular events.  A registry
 provides methods to register and unregister event handlers:
 </p>
 <dl>
 <dt><a name="index-EventRegistry_002econnect"></a>Function: <strong>EventRegistry.connect</strong> <em>(object)</em></dt>
 <dd><p>Add the given callable <var>object</var> to the registry.  This object will be
 called when an event corresponding to this registry occurs.
 </p></dd></dl>

 <dl>
 <dt><a name="index-EventRegistry_002edisconnect"></a>Function: <strong>EventRegistry.disconnect</strong> <em>(object)</em></dt>
 <dd><p>Remove the given <var>object</var> from the registry.  Once removed, the object
 will no longer receive notifications of events.
 </p></dd></dl>

 <p>Here is an example:
 </p>
 <div class="smallexample">
 <pre class="smallexample">def exit_handler (event):
     print &quot;event type: exit&quot;
     print &quot;exit code: %d&quot; % (event.exit_code)

 gdb.events.exited.connect (exit_handler)
 </pre></div>

 <p>In the above example we connect our handler <code>exit_handler</code> to the
 registry <code>events.exited</code>.  Once connected, <code>exit_handler</code> gets
 called when the inferior exits.  The argument <em>event</em> in this example is
 of type <code>gdb.ExitedEvent</code>.  As you can see in the example the
 <code>ExitedEvent</code> object has an attribute which indicates the exit code of
 the inferior.
 </p>
 <p>The following is a listing of the event registries that are available and
 details of the events they emit:
 </p>
 <dl compact="compact">
 <dt><code>events.cont</code></dt>
 <dd><p>Emits <code>gdb.ThreadEvent</code>.
 </p>
 <p>Some events can be thread specific when <small>GDB</small> is running in non-stop
 mode.  When represented in Python, these events all extend
 <code>gdb.ThreadEvent</code>.  Note, this event is not emitted directly; instead,
 events which are emitted by this or other modules might extend this event.
 Examples of these events are <code>gdb.BreakpointEvent</code> and
 <code>gdb.ContinueEvent</code>.
 </p>
 <dl>
 <dt><a name="index-ThreadEvent_002einferior_005fthread"></a>Variable: <strong>ThreadEvent.inferior_thread</strong></dt>
 <dd><p>In non-stop mode this attribute will be set to the specific thread which was
 involved in the emitted event. Otherwise, it will be set to <code>None</code>.
 </p></dd></dl>

 <p>Emits <code>gdb.ContinueEvent</code> which extends <code>gdb.ThreadEvent</code>.
 </p>
 <p>This event indicates that the inferior has been continued after a stop. For
 inherited attribute refer to <code>gdb.ThreadEvent</code> above.
 </p>
 </dd>
 <dt><code>events.exited</code></dt>
 <dd><p>Emits <code>events.ExitedEvent</code> which indicates that the inferior has exited.
 <code>events.ExitedEvent</code> has two attributes:
 </p><dl>
 <dt><a name="index-ExitedEvent_002eexit_005fcode"></a>Variable: <strong>ExitedEvent.exit_code</strong></dt>
 <dd><p>An integer representing the exit code, if available, which the inferior
 has returned.  (The exit code could be unavailable if, for example,
 <small>GDB</small> detaches from the inferior.) If the exit code is unavailable,
 the attribute does not exist.
 </p></dd></dl>
 <dl>
 <dt><a name="index-ExitedEvent"></a>Variable: <strong>ExitedEvent</strong> <em>inferior</em></dt>
 <dd><p>A reference to the inferior which triggered the <code>exited</code> event.
 </p></dd></dl>

 </dd>
 <dt><code>events.stop</code></dt>
 <dd><p>Emits <code>gdb.StopEvent</code> which extends <code>gdb.ThreadEvent</code>.
 </p>
 <p>Indicates that the inferior has stopped.  All events emitted by this registry
 extend StopEvent.  As a child of <code>gdb.ThreadEvent</code>, <code>gdb.StopEvent</code>
 will indicate the stopped thread when <small>GDB</small> is running in non-stop
 mode.  Refer to <code>gdb.ThreadEvent</code> above for more details.
 </p>
 <p>Emits <code>gdb.SignalEvent</code> which extends <code>gdb.StopEvent</code>.
 </p>
 <p>This event indicates that the inferior or one of its threads has received as
 signal.  <code>gdb.SignalEvent</code> has the following attributes:
 </p>
 <dl>
 <dt><a name="index-SignalEvent_002estop_005fsignal"></a>Variable: <strong>SignalEvent.stop_signal</strong></dt>
 <dd><p>A string representing the signal received by the inferior.  A list of possible
 signal values can be obtained by running the command <code>info signals</code> in
 the <small>GDB</small> command prompt.
 </p></dd></dl>

 <p>Also emits  <code>gdb.BreakpointEvent</code> which extends <code>gdb.StopEvent</code>.
 </p>
 <p><code>gdb.BreakpointEvent</code> event indicates that one or more breakpoints have
 been hit, and has the following attributes:
 </p>
 <dl>
 <dt><a name="index-BreakpointEvent_002ebreakpoints"></a>Variable: <strong>BreakpointEvent.breakpoints</strong></dt>
 <dd><p>A sequence containing references to all the breakpoints (type
 <code>gdb.Breakpoint</code>) that were hit.
 See <a href="Breakpoints-In-Python.html#Breakpoints-In-Python">Breakpoints In Python</a>, for details of the <code>gdb.Breakpoint</code> object.
 </p></dd></dl>
 <dl>
 <dt><a name="index-BreakpointEvent_002ebreakpoint"></a>Variable: <strong>BreakpointEvent.breakpoint</strong></dt>
 <dd><p>A reference to the first breakpoint that was hit.
 This function is maintained for backward compatibility and is now deprecated
 in favor of the <code>gdb.BreakpointEvent.breakpoints</code> attribute.
 </p></dd></dl>

 </dd>
 <dt><code>events.new_objfile</code></dt>
 <dd><p>Emits <code>gdb.NewObjFileEvent</code> which indicates that a new object file has
 been loaded by <small>GDB</small>.  <code>gdb.NewObjFileEvent</code> has one attribute:
 </p>
 <dl>
 <dt><a name="index-NewObjFileEvent_002enew_005fobjfile"></a>Variable: <strong>NewObjFileEvent.new_objfile</strong></dt>
 <dd><p>A reference to the object file (<code>gdb.Objfile</code>) which has been loaded.
 See <a href="Objfiles-In-Python.html#Objfiles-In-Python">Objfiles In Python</a>, for details of the <code>gdb.Objfile</code> object.
 </p></dd></dl>

 </dd>
 <dt><code>events.clear_objfiles</code></dt>
 <dd><p>Emits <code>gdb.ClearObjFilesEvent</code> which indicates that the list of object
 files for a program space has been reset.
 <code>gdb.ClearObjFilesEvent</code> has one attribute:
 </p>
 <dl>
 <dt><a name="index-ClearObjFilesEvent_002eprogspace"></a>Variable: <strong>ClearObjFilesEvent.progspace</strong></dt>
 <dd><p>A reference to the program space (<code>gdb.Progspace</code>) whose objfile list has
 been cleared.  See <a href="Progspaces-In-Python.html#Progspaces-In-Python">Progspaces In Python</a>.
 </p></dd></dl>

 </dd>
 <dt><code>events.inferior_call_pre</code></dt>
 <dd><p>Emits <code>gdb.InferiorCallPreEvent</code> which indicates that a function in
 the inferior is about to be called.
 </p>
 <dl>
 <dt><a name="index-InferiorCallPreEvent_002eptid"></a>Variable: <strong>InferiorCallPreEvent.ptid</strong></dt>
 <dd><p>The thread in which the call will be run.
 </p></dd></dl>

 <dl>
 <dt><a name="index-InferiorCallPreEvent_002eaddress"></a>Variable: <strong>InferiorCallPreEvent.address</strong></dt>
 <dd><p>The location of the function to be called.
 </p></dd></dl>

 </dd>
 <dt><code>events.inferior_call_post</code></dt>
 <dd><p>Emits <code>gdb.InferiorCallPostEvent</code> which indicates that a function in
 the inferior has returned.
 </p>
 <dl>
 <dt><a name="index-InferiorCallPostEvent_002eptid"></a>Variable: <strong>InferiorCallPostEvent.ptid</strong></dt>
 <dd><p>The thread in which the call was run.
 </p></dd></dl>

 <dl>
 <dt><a name="index-InferiorCallPostEvent_002eaddress"></a>Variable: <strong>InferiorCallPostEvent.address</strong></dt>
 <dd><p>The location of the function that was called.
 </p></dd></dl>

 </dd>
 <dt><code>events.memory_changed</code></dt>
 <dd><p>Emits <code>gdb.MemoryChangedEvent</code> which indicates that the memory of the
 inferior has been modified by the <small>GDB</small> user, for instance via a
 command like <code>set&nbsp;*addr&nbsp;=&nbsp;value</code><!-- /@w -->.  The event has the following
 attributes:
 </p>
 <dl>
 <dt><a name="index-MemoryChangedEvent_002eaddress"></a>Variable: <strong>MemoryChangedEvent.address</strong></dt>
 <dd><p>The start address of the changed region.
 </p></dd></dl>

 <dl>
 <dt><a name="index-MemoryChangedEvent_002elength"></a>Variable: <strong>MemoryChangedEvent.length</strong></dt>
 <dd><p>Length in bytes of the changed region.
 </p></dd></dl>

 </dd>
 <dt><code>events.register_changed</code></dt>
 <dd><p>Emits <code>gdb.RegisterChangedEvent</code> which indicates that a register in the
 inferior has been modified by the <small>GDB</small> user.
 </p>
 <dl>
 <dt><a name="index-RegisterChangedEvent_002eframe"></a>Variable: <strong>RegisterChangedEvent.frame</strong></dt>
 <dd><p>A gdb.Frame object representing the frame in which the register was modified.
 </p></dd></dl>
 <dl>
 <dt><a name="index-RegisterChangedEvent_002eregnum"></a>Variable: <strong>RegisterChangedEvent.regnum</strong></dt>
 <dd><p>Denotes which register was modified.
 </p></dd></dl>

 </dd>
 </dl>

 <hr>
 <div class="header">
 <p>
 Next: <a href="Threads-In-Python.html#Threads-In-Python" accesskey="n" rel="next">Threads In Python</a>, Previous: <a href="Inferiors-In-Python.html#Inferiors-In-Python" accesskey="p" rel="prev">Inferiors In Python</a>, Up: <a href="Python-API.html#Python-API" accesskey="u" rel="up">Python API</a> &nbsp; [<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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	<a name="Events-In-Python"></a>
	<div class="header">
	<p>
	Next: <a href="Threads-In-Python.html#Threads-In-Python" accesskey="n" rel="next">Threads In Python</a>, Previous: <a href="Inferiors-In-Python.html#Inferiors-In-Python" accesskey="p" rel="prev">Inferiors In Python</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>
	</div>
	<hr>
	<a name="Events-In-Python-1"></a>
	<h4 class="subsubsection">23.2.2.17 Events In Python</h4>
	<a name="index-inferior-events-in-Python"></a>

	<p><small>GDB</small> provides a general event facility so that Python code can be
	notified of various state changes, particularly changes that occur in
	the inferior.
	</p>
	<p>An <em>event</em> is just an object that describes some state change. The
	type of the object and its attributes will vary depending on the details
	of the change. All the existing events are described below.
	</p>
	<p>In order to be notified of an event, you must register an event handler
	with an <em>event registry</em>. An event registry is an object in the
	<code>gdb.events</code> module which dispatches particular events. A registry
	provides methods to register and unregister event handlers:
	</p>
	<dl>
	<dt><a name="index-EventRegistry_002econnect"></a>Function: <strong>EventRegistry.connect</strong> <em>(object)</em></dt>
	<dd><p>Add the given callable <var>object</var> to the registry. This object will be
	called when an event corresponding to this registry occurs.
	</p></dd></dl>

	<dl>
	<dt><a name="index-EventRegistry_002edisconnect"></a>Function: <strong>EventRegistry.disconnect</strong> <em>(object)</em></dt>
	<dd><p>Remove the given <var>object</var> from the registry. Once removed, the object
	will no longer receive notifications of events.
	</p></dd></dl>

	<p>Here is an example:
	</p>
	<div class="smallexample">
	<pre class="smallexample">def exit_handler (event):
	print "event type: exit"
	print "exit code: %d" % (event.exit_code)

	gdb.events.exited.connect (exit_handler)
	</pre></div>

	<p>In the above example we connect our handler <code>exit_handler</code> to the
	registry <code>events.exited</code>. Once connected, <code>exit_handler</code> gets
	called when the inferior exits. The argument <em>event</em> in this example is
	of type <code>gdb.ExitedEvent</code>. As you can see in the example the
	<code>ExitedEvent</code> object has an attribute which indicates the exit code of
	the inferior.
	</p>
	<p>The following is a listing of the event registries that are available and
	details of the events they emit:
	</p>
	<dl compact="compact">
	<dt><code>events.cont</code></dt>
	<dd><p>Emits <code>gdb.ThreadEvent</code>.
	</p>
	<p>Some events can be thread specific when <small>GDB</small> is running in non-stop
	mode. When represented in Python, these events all extend
	<code>gdb.ThreadEvent</code>. Note, this event is not emitted directly; instead,
	events which are emitted by this or other modules might extend this event.
	Examples of these events are <code>gdb.BreakpointEvent</code> and
	<code>gdb.ContinueEvent</code>.
	</p>
	<dl>
	<dt><a name="index-ThreadEvent_002einferior_005fthread"></a>Variable: <strong>ThreadEvent.inferior_thread</strong></dt>
	<dd><p>In non-stop mode this attribute will be set to the specific thread which was
	involved in the emitted event. Otherwise, it will be set to <code>None</code>.
	</p></dd></dl>

	<p>Emits <code>gdb.ContinueEvent</code> which extends <code>gdb.ThreadEvent</code>.
	</p>
	<p>This event indicates that the inferior has been continued after a stop. For
	inherited attribute refer to <code>gdb.ThreadEvent</code> above.
	</p>
	</dd>
	<dt><code>events.exited</code></dt>
	<dd><p>Emits <code>events.ExitedEvent</code> which indicates that the inferior has exited.
	<code>events.ExitedEvent</code> has two attributes:
	</p><dl>
	<dt><a name="index-ExitedEvent_002eexit_005fcode"></a>Variable: <strong>ExitedEvent.exit_code</strong></dt>
	<dd><p>An integer representing the exit code, if available, which the inferior
	has returned. (The exit code could be unavailable if, for example,
	<small>GDB</small> detaches from the inferior.) If the exit code is unavailable,
	the attribute does not exist.
	</p></dd></dl>
	<dl>
	<dt><a name="index-ExitedEvent"></a>Variable: <strong>ExitedEvent</strong> <em>inferior</em></dt>
	<dd><p>A reference to the inferior which triggered the <code>exited</code> event.
	</p></dd></dl>

	</dd>
	<dt><code>events.stop</code></dt>
	<dd><p>Emits <code>gdb.StopEvent</code> which extends <code>gdb.ThreadEvent</code>.
	</p>
	<p>Indicates that the inferior has stopped. All events emitted by this registry
	extend StopEvent. As a child of <code>gdb.ThreadEvent</code>, <code>gdb.StopEvent</code>
	will indicate the stopped thread when <small>GDB</small> is running in non-stop
	mode. Refer to <code>gdb.ThreadEvent</code> above for more details.
	</p>
	<p>Emits <code>gdb.SignalEvent</code> which extends <code>gdb.StopEvent</code>.
	</p>
	<p>This event indicates that the inferior or one of its threads has received as
	signal. <code>gdb.SignalEvent</code> has the following attributes:
	</p>
	<dl>
	<dt><a name="index-SignalEvent_002estop_005fsignal"></a>Variable: <strong>SignalEvent.stop_signal</strong></dt>
	<dd><p>A string representing the signal received by the inferior. A list of possible
	signal values can be obtained by running the command <code>info signals</code> in
	the <small>GDB</small> command prompt.
	</p></dd></dl>

	<p>Also emits <code>gdb.BreakpointEvent</code> which extends <code>gdb.StopEvent</code>.
	</p>
	<p><code>gdb.BreakpointEvent</code> event indicates that one or more breakpoints have
	been hit, and has the following attributes:
	</p>
	<dl>
	<dt><a name="index-BreakpointEvent_002ebreakpoints"></a>Variable: <strong>BreakpointEvent.breakpoints</strong></dt>
	<dd><p>A sequence containing references to all the breakpoints (type
	<code>gdb.Breakpoint</code>) that were hit.
	See <a href="Breakpoints-In-Python.html#Breakpoints-In-Python">Breakpoints In Python</a>, for details of the <code>gdb.Breakpoint</code> object.
	</p></dd></dl>
	<dl>
	<dt><a name="index-BreakpointEvent_002ebreakpoint"></a>Variable: <strong>BreakpointEvent.breakpoint</strong></dt>
	<dd><p>A reference to the first breakpoint that was hit.
	This function is maintained for backward compatibility and is now deprecated
	in favor of the <code>gdb.BreakpointEvent.breakpoints</code> attribute.
	</p></dd></dl>

	</dd>
	<dt><code>events.new_objfile</code></dt>
	<dd><p>Emits <code>gdb.NewObjFileEvent</code> which indicates that a new object file has
	been loaded by <small>GDB</small>. <code>gdb.NewObjFileEvent</code> has one attribute:
	</p>
	<dl>
	<dt><a name="index-NewObjFileEvent_002enew_005fobjfile"></a>Variable: <strong>NewObjFileEvent.new_objfile</strong></dt>
	<dd><p>A reference to the object file (<code>gdb.Objfile</code>) which has been loaded.
	See <a href="Objfiles-In-Python.html#Objfiles-In-Python">Objfiles In Python</a>, for details of the <code>gdb.Objfile</code> object.
	</p></dd></dl>

	</dd>
	<dt><code>events.clear_objfiles</code></dt>
	<dd><p>Emits <code>gdb.ClearObjFilesEvent</code> which indicates that the list of object
	files for a program space has been reset.
	<code>gdb.ClearObjFilesEvent</code> has one attribute:
	</p>
	<dl>
	<dt><a name="index-ClearObjFilesEvent_002eprogspace"></a>Variable: <strong>ClearObjFilesEvent.progspace</strong></dt>
	<dd><p>A reference to the program space (<code>gdb.Progspace</code>) whose objfile list has
	been cleared. See <a href="Progspaces-In-Python.html#Progspaces-In-Python">Progspaces In Python</a>.
	</p></dd></dl>

	</dd>
	<dt><code>events.inferior_call_pre</code></dt>
	<dd><p>Emits <code>gdb.InferiorCallPreEvent</code> which indicates that a function in
	the inferior is about to be called.
	</p>
	<dl>
	<dt><a name="index-InferiorCallPreEvent_002eptid"></a>Variable: <strong>InferiorCallPreEvent.ptid</strong></dt>
	<dd><p>The thread in which the call will be run.
	</p></dd></dl>

	<dl>
	<dt><a name="index-InferiorCallPreEvent_002eaddress"></a>Variable: <strong>InferiorCallPreEvent.address</strong></dt>
	<dd><p>The location of the function to be called.
	</p></dd></dl>

	</dd>
	<dt><code>events.inferior_call_post</code></dt>
	<dd><p>Emits <code>gdb.InferiorCallPostEvent</code> which indicates that a function in
	the inferior has returned.
	</p>
	<dl>
	<dt><a name="index-InferiorCallPostEvent_002eptid"></a>Variable: <strong>InferiorCallPostEvent.ptid</strong></dt>
	<dd><p>The thread in which the call was run.
	</p></dd></dl>

	<dl>
	<dt><a name="index-InferiorCallPostEvent_002eaddress"></a>Variable: <strong>InferiorCallPostEvent.address</strong></dt>
	<dd><p>The location of the function that was called.
	</p></dd></dl>

	</dd>
	<dt><code>events.memory_changed</code></dt>
	<dd><p>Emits <code>gdb.MemoryChangedEvent</code> which indicates that the memory of the
	inferior has been modified by the <small>GDB</small> user, for instance via a
	command like <code>set *addr = value</code><!-- /@w -->. The event has the following
	attributes:
	</p>
	<dl>
	<dt><a name="index-MemoryChangedEvent_002eaddress"></a>Variable: <strong>MemoryChangedEvent.address</strong></dt>
	<dd><p>The start address of the changed region.
	</p></dd></dl>

	<dl>
	<dt><a name="index-MemoryChangedEvent_002elength"></a>Variable: <strong>MemoryChangedEvent.length</strong></dt>
	<dd><p>Length in bytes of the changed region.
	</p></dd></dl>

	</dd>
	<dt><code>events.register_changed</code></dt>
	<dd><p>Emits <code>gdb.RegisterChangedEvent</code> which indicates that a register in the
	inferior has been modified by the <small>GDB</small> user.
	</p>
	<dl>
	<dt><a name="index-RegisterChangedEvent_002eframe"></a>Variable: <strong>RegisterChangedEvent.frame</strong></dt>
	<dd><p>A gdb.Frame object representing the frame in which the register was modified.
	</p></dd></dl>
	<dl>
	<dt><a name="index-RegisterChangedEvent_002eregnum"></a>Variable: <strong>RegisterChangedEvent.regnum</strong></dt>
	<dd><p>Denotes which register was modified.
	</p></dd></dl>

	</dd>
	</dl>

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