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<h3 class="section" id="Entering-Debug-Mode-1"><span>13.1 Entering Debug Mode<a class="copiable-link" href="#Entering-Debug-Mode-1"> ¶</a></span></h3>
<p>There are two basic means of interrupting the execution of an Octave
script. These are breakpoints (see <a class="pxref" href="Breakpoints.html">Breakpoints</a>), discussed in the next
section, and interruption based on some condition.
</p>
<p>Octave supports three means to stop execution based on the values set in
the functions <code class="code">debug_on_interrupt</code>, <code class="code">debug_on_warning</code>, and
<code class="code">debug_on_error</code>.
</p>
<a class="anchor" id="XREFdebug_005fon_005finterrupt"></a><span style="display:block; margin-top:-4.5ex;"> </span>
<dl class="first-deftypefn">
<dt class="deftypefn" id="index-debug_005fon_005finterrupt"><span><code class="def-type"><var class="var">val</var> =</code> <strong class="def-name">debug_on_interrupt</strong> <code class="def-code-arguments">()</code><a class="copiable-link" href="#index-debug_005fon_005finterrupt"> ¶</a></span></dt>
<dt class="deftypefnx def-cmd-deftypefn" id="index-debug_005fon_005finterrupt-1"><span><code class="def-type"><var class="var">old_val</var> =</code> <strong class="def-name">debug_on_interrupt</strong> <code class="def-code-arguments">(<var class="var">new_val</var>)</code><a class="copiable-link" href="#index-debug_005fon_005finterrupt-1"> ¶</a></span></dt>
<dt class="deftypefnx def-cmd-deftypefn" id="index-debug_005fon_005finterrupt-2"><span><code class="def-type"><var class="var">old_val</var> =</code> <strong class="def-name">debug_on_interrupt</strong> <code class="def-code-arguments">(<var class="var">new_val</var>, "local")</code><a class="copiable-link" href="#index-debug_005fon_005finterrupt-2"> ¶</a></span></dt>
<dd><p>Query or set the internal variable that controls whether Octave will try
to enter debugging mode when it receives an interrupt signal (typically
generated with <kbd class="kbd">C-c</kbd>).
</p>
<p>If a second interrupt signal is received before reaching the debugging mode,
a normal interrupt will occur.
</p>
<p>When called from inside a function with the <code class="code">"local"</code> option, the
variable is changed locally for the function and any subroutines it calls.
The original variable value is restored when exiting the function.
</p>
<p><strong class="strong">See also:</strong> <a class="ref" href="#XREFdebug_005fon_005ferror">debug_on_error</a>, <a class="ref" href="#XREFdebug_005fon_005fwarning">debug_on_warning</a>.
</p></dd></dl>
<a class="anchor" id="XREFdebug_005fon_005fwarning"></a><span style="display:block; margin-top:-4.5ex;"> </span>
<dl class="first-deftypefn">
<dt class="deftypefn" id="index-debug_005fon_005fwarning"><span><code class="def-type"><var class="var">val</var> =</code> <strong class="def-name">debug_on_warning</strong> <code class="def-code-arguments">()</code><a class="copiable-link" href="#index-debug_005fon_005fwarning"> ¶</a></span></dt>
<dt class="deftypefnx def-cmd-deftypefn" id="index-debug_005fon_005fwarning-1"><span><code class="def-type"><var class="var">old_val</var> =</code> <strong class="def-name">debug_on_warning</strong> <code class="def-code-arguments">(<var class="var">new_val</var>)</code><a class="copiable-link" href="#index-debug_005fon_005fwarning-1"> ¶</a></span></dt>
<dt class="deftypefnx def-cmd-deftypefn" id="index-debug_005fon_005fwarning-2"><span><code class="def-type"><var class="var">old_val</var> =</code> <strong class="def-name">debug_on_warning</strong> <code class="def-code-arguments">(<var class="var">new_val</var>, "local")</code><a class="copiable-link" href="#index-debug_005fon_005fwarning-2"> ¶</a></span></dt>
<dd><p>Query or set the internal variable that controls whether Octave will try
to enter the debugger when a warning is encountered.
</p>
<p>When called from inside a function with the <code class="code">"local"</code> option, the
variable is changed locally for the function and any subroutines it calls.
The original variable value is restored when exiting the function.
</p>
<p><strong class="strong">See also:</strong> <a class="ref" href="#XREFdebug_005fon_005ferror">debug_on_error</a>, <a class="ref" href="#XREFdebug_005fon_005finterrupt">debug_on_interrupt</a>.
</p></dd></dl>
<a class="anchor" id="XREFdebug_005fon_005ferror"></a><span style="display:block; margin-top:-4.5ex;"> </span>
<dl class="first-deftypefn">
<dt class="deftypefn" id="index-debug_005fon_005ferror"><span><code class="def-type"><var class="var">val</var> =</code> <strong class="def-name">debug_on_error</strong> <code class="def-code-arguments">()</code><a class="copiable-link" href="#index-debug_005fon_005ferror"> ¶</a></span></dt>
<dt class="deftypefnx def-cmd-deftypefn" id="index-debug_005fon_005ferror-1"><span><code class="def-type"><var class="var">old_val</var> =</code> <strong class="def-name">debug_on_error</strong> <code class="def-code-arguments">(<var class="var">new_val</var>)</code><a class="copiable-link" href="#index-debug_005fon_005ferror-1"> ¶</a></span></dt>
<dt class="deftypefnx def-cmd-deftypefn" id="index-debug_005fon_005ferror-2"><span><code class="def-type"><var class="var">old_val</var> =</code> <strong class="def-name">debug_on_error</strong> <code class="def-code-arguments">(<var class="var">new_val</var>, "local")</code><a class="copiable-link" href="#index-debug_005fon_005ferror-2"> ¶</a></span></dt>
<dd><p>Query or set the internal variable that controls whether Octave will try
to enter the debugger when an error is encountered.
</p>
<p>This will also inhibit printing of the normal traceback message (you will
only see the top-level error message).
</p>
<p>When called from inside a function with the <code class="code">"local"</code> option, the
variable is changed locally for the function and any subroutines it calls.
The original variable value is restored when exiting the function.
</p>
<p><strong class="strong">See also:</strong> <a class="ref" href="#XREFdebug_005fon_005fwarning">debug_on_warning</a>, <a class="ref" href="#XREFdebug_005fon_005finterrupt">debug_on_interrupt</a>.
</p></dd></dl>
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