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<p style="margin-top: 0;">On June 26th, 2012, 5:08 p.m., <b>Matt Jordan</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/2002/diff/1/?file=29133#file29133line1" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/.cleancount</a>
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(Diff revision 1)
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">39</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">40</pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Why is this needed?</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Because of this comment for struct ast_channel:
* \brief Main Channel structure associated with a channel.
*
* \note XXX It is important to remember to increment .cleancount each time
* this structure is changed. XXX
Though with channel opaquification the note is not really needed anymore.</pre>
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<p style="margin-top: 0;">On June 26th, 2012, 5:08 p.m., <b>Matt Jordan</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/2002/diff/1/?file=29134#file29134line3027" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/apps/app_dial.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int dial_exec_full(struct ast_channel *chan, const char *data, struct ast_flags64 *peerflags, int *continue_exec)</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="kt">int</span> <span class="n">autoloopflag</span><span class="p">;</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_autoservice_start</span><span class="p">(</span><span class="n">chan</span><span class="p">);</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="kt">int</span> <span class="n">found</span><span class="p">;</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_pbx_h_exten_run</span><span class="p">(</span><span class="n">peer</span><span class="p">,</span> <span class="n">ast_channel_context</span><span class="p">(</span><span class="n">peer</span><span class="p">));</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="kt">int</span> <span class="n">res9</span><span class="p">;</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_autoservice_stop</span><span class="p">(</span><span class="n">chan</span><span class="p">);</span></pre></td>
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<td bgcolor="#ffc5ce" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="ew"> </span></pre></td>
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<td bgcolor="#ffc5ce" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_channel_exten_set</span><span class="p">(</span><span class="n">peer</span><span class="p">,</span> <span class="s">"h"</span><span class="p">);</span></pre></td>
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<td bgcolor="#ffc5ce" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_channel_priority_set</span><span class="p">(</span><span class="n">peer</span><span class="p">,</span> <span class="mi">1</span><span class="p">);</span></pre></td>
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<td bgcolor="#ffc5ce" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">autoloopflag</span> <span class="o">=</span> <span class="n">ast_test_flag</span><span class="p">(</span><span class="n">ast_channel_flags</span><span class="p">(</span><span class="n">peer</span><span class="p">),</span> <span class="n">AST_FLAG_IN_AUTOLOOP</span><span class="p">);</span> <span class="cm">/* save value to restore at the end */</span></pre></td>
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<td bgcolor="#ffc5ce" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_set_flag</span><span class="p">(</span><span class="n">ast_channel_flags</span><span class="p">(</span><span class="n">peer</span><span class="p">),</span> <span class="n">AST_FLAG_IN_AUTOLOOP</span><span class="p">);</span></pre></td>
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<td bgcolor="#ffc5ce" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
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<td bgcolor="#ffc5ce" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">while</span> <span class="p">((</span><span class="n">res9</span> <span class="o">=</span> <span class="n">ast_spawn_extension</span><span class="p">(</span><span class="n">peer</span><span class="p">,</span> <span class="n">ast_channel_context</span><span class="p">(</span><span class="n">peer</span><span class="p">),</span> <span class="n">ast_channel_exten</span><span class="p">(</span><span class="n">peer</span><span class="p">),</span></pre></td>
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<td bgcolor="#ffc5ce" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_channel_priority</span><span class="p">(</span><span class="n">peer</span><span class="p">),</span></pre></td>
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<td bgcolor="#ffc5ce" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">S_COR</span><span class="p">(</span><span class="n">ast_channel_caller</span><span class="p">(</span><span class="n">peer</span><span class="p">)</span><span class="o">-></span><span class="n">id</span><span class="p">.</span><span class="n">number</span><span class="p">.</span><span class="n">valid</span><span class="p">,</span> <span class="n">ast_channel_caller</span><span class="p">(</span><span class="n">peer</span><span class="p">)</span><span class="o">-></span><span class="n">id</span><span class="p">.</span><span class="n">number</span><span class="p">.</span><span class="n">str</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">),</span></pre></td>
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<td bgcolor="#ffc5ce" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="o">&</span><span class="n">found</span><span class="p">,</span> <span class="mi">1</span><span class="p">))</span> <span class="o">==</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<td bgcolor="#ffc5ce" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_channel_priority_set</span><span class="p">(</span><span class="n">peer</span><span class="p">,</span> <span class="n">ast_channel_priority</span><span class="p">(</span><span class="n">peer</span><span class="p">)</span> <span class="o">+</span> <span class="mi">1</span><span class="p">);</span></pre></td>
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<td bgcolor="#ffc5ce" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span></pre></td>
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<td bgcolor="#ffc5ce" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
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<td bgcolor="#ffc5ce" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">found</span> <span class="o">&&</span> <span class="n">res9</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<td bgcolor="#ffc5ce" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/* Something bad happened, or a hangup has been requested. */</span></pre></td>
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<td bgcolor="#ffc5ce" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_debug</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="s">"Spawn extension (%s,%s,%d) exited non-zero on '%s'</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> <span class="n">ast_channel_context</span><span class="p">(</span><span class="n">peer</span><span class="p">),</span> <span class="n">ast_channel_exten</span><span class="p">(</span><span class="n">peer</span><span class="p">),</span> <span class="n">ast_channel_priority</span><span class="p">(</span><span class="n">peer</span><span class="p">),</span> <span class="n">ast_channel_name</span><span class="p">(</span><span class="n">peer</span><span class="p">));</span></pre></td>
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<td bgcolor="#ffc5ce" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_verb</span><span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="s">"Spawn extension (%s, %s, %d) exited non-zero on '%s'</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> <span class="n">ast_channel_context</span><span class="p">(</span><span class="n">peer</span><span class="p">),</span> <span class="n">ast_channel_exten</span><span class="p">(</span><span class="n">peer</span><span class="p">),</span> <span class="n">ast_channel_priority</span><span class="p">(</span><span class="n">peer</span><span class="p">),</span> <span class="n">ast_channel_name</span><span class="p">(</span><span class="n">peer</span><span class="p">));</span></pre></td>
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<td bgcolor="#ffc5ce" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span></pre></td>
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<td bgcolor="#ffc5ce" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_set2_flag</span><span class="p">(</span><span class="n">ast_channel_flags</span><span class="p">(</span><span class="n">peer</span><span class="p">),</span> <span class="n">autoloopflag</span><span class="p">,</span> <span class="n">AST_FLAG_IN_AUTOLOOP</span><span class="p">);</span> <span class="cm">/* set it back the way it was */</span></pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">This previously would not end the CDR. ast_pbx_h_exten_run explicitly does.
Will that cause a problem?</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I don't think so since this is done on the *peer* channel and likely was an overlooked h-exten execution location when the endbeforehexten option was added. The peer is going to be hung up right after anyway.</pre>
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<p style="margin-top: 0;">On June 26th, 2012, 5:08 p.m., <b>Matt Jordan</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/2002/diff/1/?file=29139#file29139line116" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/funcs/func_channel.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">ASTERISK_FILE_VERSION(__FILE__, "$Revision$")</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> <enum name="hangup_handler_replace"></span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> <para>W/O Replace the entire hangup handler stack</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> with a new hangup handler on the channel if supplied. The</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> assigned string is passed to the Gosub application when</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> the channel is hung up. Any optionally omitted context</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> and exten are supplied by the channel pushing the handler</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> before it is pushed.</para></span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> </enum></span></pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">We talked a bit about this, and replace - to me - still sounds like a 'swap' operation, where a hangup handler would be replaced (see?) with another hangup handler.
Clear, wipe, remove_all, or something else that implies total destruction of all existing hangup handlers seems clearer to me. The fact that you can *also* (optionally) put a new hangup handler on the stack seems secondary to the effect that you nuke the entire stack in the first place.</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">It is a swap operation. The entire hangup handler stack is swapped with a new hangup handler.
I think wipe is the better choice here so I will change it to that.</pre>
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<p style="margin-top: 0;">On June 26th, 2012, 5:08 p.m., <b>Matt Jordan</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/2002/diff/1/?file=29143#file29143line6924" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/main/channel.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">int ast_do_masquerade(struct ast_channel *original)</pre></td>
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<td bgcolor="#ffc5ce" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_channel_tech_set</span><span class="p">(</span><span class="n">clonechan</span><span class="p">,</span> <span class="o">&</span><span class="n">ast_kill_tech</span><span class="p">);</span></pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">If you're getting rid of this here, then is the ast_kill_tech still needed in feature_request_and_dial?
If not, then I don't think its needed at all anywhere anymore.</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">That tech was created initially for feature_request_and_dial(). The reason for it there is still valid. It was just promoted to a public name, location, and made unconditional code when ast_do_masquerade() had a need for it. It is now only used by feature_request_and_dial() so technically it could be moved back.</pre>
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<p style="margin-top: 0;">On June 26th, 2012, 5:08 p.m., <b>Matt Jordan</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/2002/diff/1/?file=29146#file29146line5381" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/main/pbx.c</a>
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<td colspan="2"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">void ast_pbx_h_exten_run(struct ast_channel *chan, const char *context)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_channel_lock</span><span class="p">(</span><span class="n">chan</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">spawn_error</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">break</span><span class="p">;</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span></pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">This is a little tricky, in that it looks like you're forgetting to unlock the channel when you come out of the loop.
A comment here might be nice.</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">ok</pre>
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<p style="margin-top: 0;">On June 26th, 2012, 5:08 p.m., <b>Matt Jordan</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/2002/diff/1/?file=29146#file29146line5428" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/main/pbx.c</a>
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<td colspan="2"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">void ast_pbx_h_exten_run(struct ast_channel *chan, const char *context)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">for</span> <span class="p">(;;)</span> <span class="p">{</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">handlers</span> <span class="o">=</span> <span class="n">ast_channel_hangup_handlers</span><span class="p">(</span><span class="n">chan</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">h_handler</span> <span class="o">=</span> <span class="n">AST_LIST_REMOVE_HEAD</span><span class="p">(</span><span class="n">handlers</span><span class="p">,</span> <span class="n">node</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">h_handler</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_channel_unlock</span><span class="p">(</span><span class="n">chan</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">break</span><span class="p">;</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">manager_event</span><span class="p">(</span><span class="n">EVENT_FLAG_DIALPLAN</span><span class="p">,</span> <span class="s">"HangupHandlerRun"</span><span class="p">,</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="s">"Channel: %s</span><span class="se">\r\n</span><span class="s">"</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="s">"Uniqueid: %s</span><span class="se">\r\n</span><span class="s">"</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="s">"Handler: %s</span><span class="se">\r\n</span><span class="s">"</span><span class="p">,</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_channel_name</span><span class="p">(</span><span class="n">chan</span><span class="p">),</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_channel_uniqueid</span><span class="p">(</span><span class="n">chan</span><span class="p">),</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">h_handler</span><span class="o">-></span><span class="n">args</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_channel_unlock</span><span class="p">(</span><span class="n">chan</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_app_exec_sub</span><span class="p">(</span><span class="nb">NULL</span><span class="p">,</span> <span class="n">chan</span><span class="p">,</span> <span class="n">h_handler</span><span class="o">-></span><span class="n">args</span><span class="p">,</span> <span class="mi">1</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_free</span><span class="p">(</span><span class="n">h_handler</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_channel_lock</span><span class="p">(</span><span class="n">chan</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span></pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I'm curious, - why is this in a for (;;)?
I would think you would be able to get the handlers, then do a:
while ((h_handler = AST_LIST_REMOVE_HEAD(handlers, node)) {
...
}
Is there an expectation that the list might be consumed and a new handler added by an executing hangup handler?</pre>
</blockquote>
</blockquote>
<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Once the channel lock is released, you really should not depend on a pointer returned by the ast_channel accessor function to remain the same. For Asterisk 11 this will not be the case but going forward it might not be.
</pre>
<br />
<p>- rmudgett</p>
<br />
<p>On June 25th, 2012, 11:30 a.m., rmudgett wrote:</p>
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<div>Review request for Asterisk Developers and kobaz.</div>
<div>By rmudgett.</div>
<p style="color: grey;"><i>Updated June 25, 2012, 11:30 a.m.</i></p>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">This feature originated with https://reviewboard.asterisk.org/r/1230/ by kobaz.
See
https://wiki.asterisk.org/wiki/display/AST/Asterisk+11+Projects
https://wiki.asterisk.org/wiki/display/AST/Hangup+handlers
Hangup handlers are an alternative to the h extension. They can be used
in addition to the h extension. The idea is to attach a Gosub routine to
a channel that will execute when the call hangs up. Whereas which h
extension gets executed depends on the location of dialplan execution when
the call hangs up, hangup handlers are attached to the call channel. You
can attach multiple handlers that will execute in the order of most
recently added first.
Call transfers, call pickup, and call parking can result in channels on
both sides of a bridge containing hangup handlers.
Hangup handlers can also be attached to any call leg because of pre-dial
routines.
When hangup handlers are executed
Any hangup handlers associated with a channel are always executed when the
channel is hung up.
Manipulating hangup handlers on a channel
Hangup handlers pass the saved handler string to the Gosub application to
execute. The syntax is intentionally the same as the Gosub application.
If context or exten are not supplied then the current values from the
channel pushing the hangup handler are inserted before storing on the
hangup handler stack.
Push a hangup handler onto a channel:
same => n,Set(CHANNEL(hangup_handler_push)=[[context,]exten,]priority[(arg1[,...][,argN])]);
Pop a hangup handler off a channel and optionally push a replacement:
same => n,Set(CHANNEL(hangup_handler_pop)=[[[context,]exten,]priority[(arg1[,...][,argN])]]);
Pop all hangup handlers off a channel and optionally push a replacement:
same => n,Set(CHANNEL(hangup_handler_replace)=[[[context,]exten,]priority[(arg1[,...][,argN])]]);
Cascading hangup handlers
same => n,Set(CHANNEL(hangup_handler_push)=hdlr3,s,1(args));
same => n,Set(CHANNEL(hangup_handler_push)=hdlr2,s,1(args));
same => n,Set(CHANNEL(hangup_handler_push)=hdlr1,s,1(args));
AMI events
The hangup handler AMI events are output as part of the AMI dialplan
permission class.
* The AMI event HangupHandlerPush is generated whenever a hangup handler
is pushed on the stack by the CHANNEL() function.
* The AMI event HangupHandlerPop is generated whenever a hangup handler is
popped off the stack by the CHANNEL() function.
* The AMI event HangupHandlerRun is generated as a hangup handler is about
to be executed.
CLI commands
Single channel:
core show hanguphandlers <chan>
Output:
Channel Handler
<chan-name> <first handler to execute>
<second handler to execute>
<third handler to execute>
All channels:
core show hanguphandlers all
Output:
Channel Handler
<chan1-name> <first handler to execute>
<second handler to execute>
<third handler to execute>
<chan2-name> <first handler to execute>
<chan3-name> <first handler to execute>
<second handler to execute>
</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Attached hangup handlers to channels and done the following kinds of calls:
Simple A to B call.
DTMF attended transfer
DTMF blind transfer
Hangup handlers were executed when expected.</pre>
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<div style="margin-top: 1.5em;">
<b style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Bugs: </b>
<a href="https://issues.asterisk.org/jira/browse/ASTERISK-19549">ASTERISK-19549</a>
</div>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
<ul style="margin-left: 3em; padding-left: 0;">
<li>/trunk/.cleancount <span style="color: grey">(369297)</span></li>
<li>/trunk/apps/app_dial.c <span style="color: grey">(369297)</span></li>
<li>/trunk/apps/app_followme.c <span style="color: grey">(369297)</span></li>
<li>/trunk/apps/app_queue.c <span style="color: grey">(369297)</span></li>
<li>/trunk/channels/chan_local.c <span style="color: grey">(369297)</span></li>
<li>/trunk/configs/cdr.conf.sample <span style="color: grey">(369297)</span></li>
<li>/trunk/funcs/func_channel.c <span style="color: grey">(369297)</span></li>
<li>/trunk/include/asterisk/channel.h <span style="color: grey">(369297)</span></li>
<li>/trunk/include/asterisk/pbx.h <span style="color: grey">(369297)</span></li>
<li>/trunk/main/autoservice.c <span style="color: grey">(369297)</span></li>
<li>/trunk/main/channel.c <span style="color: grey">(369297)</span></li>
<li>/trunk/main/channel_internal_api.c <span style="color: grey">(369297)</span></li>
<li>/trunk/main/features.c <span style="color: grey">(369297)</span></li>
<li>/trunk/main/pbx.c <span style="color: grey">(369297)</span></li>
</ul>
<p><a href="https://reviewboard.asterisk.org/r/2002/diff/" style="margin-left: 3em;">View Diff</a></p>
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