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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;">Enough for now will look more tomorrow.</pre>
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    <a href="https://reviewboard.asterisk.org/r/2135/diff/1/?file=31500#file31500line1099" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/apps/app_dial.c</a>
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   <td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static struct ast_channel *wait_for_answer(struct ast_channel *in,</pre></td>

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    <th bgcolor="#e9eaa8" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2">1098</font></th>
    <td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">        <span class="k">while</span> <span class="p">(</span><span class="o">*</span><span class="n">to</span> <span class="o">&amp;&amp;</span> <span class="o">!</span><span class="n">peer</span><span class="p">)</span> <span class="p">{</span></pre></td>
    <th bgcolor="#e9eaa8" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1099</font></th>
    <td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">        <span class="k">while</span> <span class="p">((</span><span class="n">ast_tvdiff_ms</span><span class="p">(</span><span class="n">ast_tvnow</span><span class="p">(),</span> <span class="n">start</span><span class="p">)</span> <span class="o">&lt;</span> <span class="n">orig</span> <span class="o">||</span> <span class="n">orig</span> <span class="o">&lt;</span> <span class="mi">0</span><span class="p">)</span> <span class="o">&amp;&amp;</span> <span class="o">!</span><span class="n">peer</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Just change to:
while ((*to = ast_remaining_ms(start, orig)) &amp;&amp; !peer) {

Then the following changes in this function can be reverted.</pre>
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    <a href="https://reviewboard.asterisk.org/r/2135/diff/1/?file=31503#file31503line3492" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/apps/app_queue.c</a>
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   <td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static struct callattempt *wait_for_answer(struct queue_ent *qe, struct callattempt *outgoing, int *to, char *digit, int prebusies, int caller_disconnect, int forwardsallowed)</pre></td>

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    <th bgcolor="#e9eaa8" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2">3491</font></th>
    <td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">        <span class="k">while</span> <span class="p">(</span><span class="o">*</span><span class="n">to</span> <span class="o">&amp;&amp;</span> <span class="o">!</span><span class="n">peer</span><span class="p">)</span> <span class="p">{</span></pre></td>
    <th bgcolor="#e9eaa8" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">3492</font></th>
    <td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">        <span class="k">while</span> <span class="p">((</span><span class="n">ast_tvdiff_ms</span><span class="p">(</span><span class="n">ast_tvnow</span><span class="p">(),</span> <span class="n">start_time_tv</span><span class="p">)</span> <span class="o">&lt;</span> <span class="n">orig</span> <span class="o">||</span> <span class="n">orig</span> <span class="o">&lt;</span> <span class="mi">0</span><span class="p">)</span> <span class="o">&amp;&amp;</span> <span class="o">!</span><span class="n">peer</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Change to:
while ((*to = ast_remaining_ms(start_time_tv, orig)) &amp;&amp; !peer) {

Then many changes can be reverted in this function.</pre>
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    <a href="https://reviewboard.asterisk.org/r/2135/diff/1/?file=31503#file31503line3535" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/apps/app_queue.c</a>
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   <td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static struct callattempt *wait_for_answer(struct queue_ent *qe, struct callattempt *outgoing, int *to, char *digit, int prebusies, int caller_disconnect, int forwardsallowed)</pre></td>

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    <td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
    <th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">3535</font></th>
    <td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">                <span class="o">*</span><span class="n">to</span> <span class="o">=</span> <span class="n">ast_remaining_ms</span><span class="p">(</span><span class="n">start_time_tv</span><span class="p">,</span> <span class="n">orig</span><span class="p">);</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Revertable</pre>
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    <a href="https://reviewboard.asterisk.org/r/2135/diff/1/?file=31503#file31503line3905" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/apps/app_queue.c</a>
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   <td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static struct callattempt *wait_for_answer(struct queue_ent *qe, struct callattempt *outgoing, int *to, char *digit, int prebusies, int caller_disconnect, int forwardsallowed)</pre></td>

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    <th bgcolor="#e9eaa8" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2">3903</font></th>
    <td bgcolor="#fdfebc" 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">to</span><span class="p">)</span> <span class="p">{</span></pre></td>
    <th bgcolor="#e9eaa8" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">3905</font></th>
    <td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">                <span class="k">if</span> <span class="p">(</span><span class="n">ast_remaining_ms</span><span class="p">(</span><span class="n">start_time_tv</span><span class="p">,</span> <span class="n">orig</span><span class="p">)</span> <span class="o">&lt;=</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Revertable

This also changed behavior if the timeout was infinite.</pre>
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    <a href="https://reviewboard.asterisk.org/r/2135/diff/1/?file=31503#file31503line3910" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/apps/app_queue.c</a>
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   <td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static struct callattempt *wait_for_answer(struct queue_ent *qe, struct callattempt *outgoing, int *to, char *digit, int prebusies, int caller_disconnect, int forwardsallowed)</pre></td>

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    <td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
    <th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">3910</font></th>
    <td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="ew">        </span></pre></td>
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    <th bgcolor="#b1ebb0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2"></font></th>
    <td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
    <th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">3911</font></th>
    <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">orig</span> <span class="o">&gt;</span> <span class="o">-</span><span class="mi">1</span> <span class="o">&amp;&amp;</span> <span class="n">ast_tvdiff_ms</span><span class="p">(</span><span class="n">ast_tvnow</span><span class="p">(),</span> <span class="n">start_time_tv</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; "></pre></td>
    <th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">3912</font></th>
    <td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">                <span class="o">*</span><span class="n">to</span> <span class="o">=</span> <span class="mi">0</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; "></pre></td>
    <th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">3913</font></th>
    <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="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Revertable</pre>
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    <a href="https://reviewboard.asterisk.org/r/2135/diff/1/?file=31504#file31504line172" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/apps/app_record.c</a>
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   <td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int record_exec(struct ast_channel *chan, const char *data)</pre></td>

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    <th bgcolor="#b1ebb0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2"></font></th>
    <td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
    <th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">172</font></th>
    <td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">        <span class="k">struct</span> <span class="n">timeval</span> <span class="n">start</span><span class="p">;</span></pre></td>
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    <th bgcolor="#f0f0f0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2">172</font></th>
    <td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="ew">        </span></pre></td>
    <th bgcolor="#f0f0f0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">173</font></th>
    <td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="ew">        </span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Might as well fix the red.</pre>
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    <a href="https://reviewboard.asterisk.org/r/2135/diff/1/?file=31504#file31504line335" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/apps/app_record.c</a>
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   <td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int record_exec(struct ast_channel *chan, const char *data)</pre></td>

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    <th bgcolor="#e9eaa8" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2">334</font></th>
    <td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">                <span class="k">if</span> <span class="p">(</span><span class="n">maxduration</span> <span class="o">&gt;</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span></pre></td>
    <th bgcolor="#e9eaa8" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">335</font></th>
    <td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">        <span class="k">while</span> <span class="p">(</span><span class="n">ast_tvdiff_ms</span><span class="p">(</span><span class="n">ast_tvnow</span><span class="p">(),</span> <span class="n">start</span><span class="p">)</span> <span class="o">&lt;</span> <span class="n">maxduration</span> <span class="o">||</span> <span class="n">maxduration</span> <span class="o">&lt;</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">How about
while (ms = ast_remaining_ms(start, maxduration)) {

This suggestion could be done many other places throughout this patch.</pre>
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    <a href="https://reviewboard.asterisk.org/r/2135/diff/1/?file=31504#file31504line343" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/apps/app_record.c</a>
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   <td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int record_exec(struct ast_channel *chan, const char *data)</pre></td>

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    <th bgcolor="#b1ebb0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2"></font></th>
    <td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
    <th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">343</font></th>
    <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">ms</span> <span class="o">&gt;</span> <span class="mi">0</span> <span class="o">&amp;&amp;</span> <span class="n">waitres</span> <span class="o">==</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">use maxduration instead of ms.</pre>
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    <a href="https://reviewboard.asterisk.org/r/2135/diff/1/?file=31506#file31506line1058" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_agent.c</a>
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   <td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int agent_cont_sleep( void *data )</pre></td>

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    <th bgcolor="#e9eaa8" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2">1057</font></th>
    <td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">                <span class="k">if</span> <span class="p">(</span><span class="n">to</span> <span class="o">&lt;</span> <span class="mi">0</span><span class="p">)</span><span class="ew"> </span></pre></td>
    <th bgcolor="#e9eaa8" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1058</font></th>
    <td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="ew">                </span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Red</pre>
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    <a href="https://reviewboard.asterisk.org/r/2135/diff/1/?file=31509#file31509line2407" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/sig_analog.c</a>
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   <td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static void *__analog_ss_thread(void *data)</pre></td>

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    <th bgcolor="#b1ebb0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2"></font></th>
    <td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
    <th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">2407</font></th>
    <td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="ew">                                        </span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Red</pre>
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<p>- rmudgett</p>


<br />
<p>On September 28th, 2012, 5:15 p.m., Mark Michelson wrote:</p>






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<div>Review request for Asterisk Developers.</div>
<div>By Mark Michelson.</div>


<p style="color: grey;"><i>Updated Sept. 28, 2012, 5:15 p.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 is an interesting one. I filed issue ASTERISK-20375 a while back and David Lee fixed it. The problem was that in my setup, a call to ast_waitfor_nandfds() returned in less than a millisecond. The result was that the input-output value passed into ast_waitfor_nandfds() would never decrement the value properly. Thus a 3000 ms timeout would take *days* to actually time out.

David discovered that a similar pattern for determining the passage of time had been used throughout the code. This patch is an attempt to fix all of those. I&#39;ve created a function in time.h called ast_remaining_ms() that will tell the amount of time remaining given a starting timestamp and the duration that the original timeout was. This is useful for determining the timeout to pass to an ast_waitfor() or related function.

Most of the changes here were straightforward, but there were some tricky bits. Focus strongly on the following changes:

1) wait_for_answer() in app_dial.c
2) wait_for_answer() in app_queue.c
3) generic_fax_exec() in res_fax.c
4) places where I have started setting &quot;res&quot; instead of &quot;ms&quot; or something similar in ast_waitfor() calls. Ensure that I have not tainted a return value. I found a few of these places while testing and fixed what I found on my own, but I could have missed some places.
5) places where a timeout is supposed to restart. I&#39;ve tried to find these places, but I may have missed some.

In addition, there has been a change made to the return of ast_waitfor(). Prior to this patch, if a negative timeout were passed to ast_waitfor(), it would be impossible to return a negative value. This meant that it was impossible to detect if an error had occurred. I&#39;ve changed ast_waitfor() to be able to return a negative value if a negative timeout is passed in, but only if the underlying call to ast_waitfor_nandfds() returns NULL.

I did this because I found many places in the code with this construct:

if (ast_waitfor(chan, -1) &lt; 0) {
    ast_log(LOG_ERROR, &quot;ERMAHGERD!\n&quot;);
    return HORRIBLE_ERROR_CONDITION;
}

The problem is that the error return could never actually be reached. It should be possible with my change. Please let me know if my change could cause problems though.</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;">I&#39;ve placed many test calls through items that used timeouts like Dial and Queue with a timeout. I&#39;ve also ensured that other apps that use ast_waitfor() such as Answer() and Echo() still function properly.</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-20414">ASTERISK-20414</a>


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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
<ul style="margin-left: 3em; padding-left: 0;">

 <li>/branches/1.8/apps/app_dial.c <span style="color: grey">(373847)</span></li>

 <li>/branches/1.8/apps/app_jack.c <span style="color: grey">(373847)</span></li>

 <li>/branches/1.8/apps/app_meetme.c <span style="color: grey">(373847)</span></li>

 <li>/branches/1.8/apps/app_queue.c <span style="color: grey">(373847)</span></li>

 <li>/branches/1.8/apps/app_record.c <span style="color: grey">(373847)</span></li>

 <li>/branches/1.8/apps/app_waitforring.c <span style="color: grey">(373847)</span></li>

 <li>/branches/1.8/channels/chan_agent.c <span style="color: grey">(373847)</span></li>

 <li>/branches/1.8/channels/chan_dahdi.c <span style="color: grey">(373847)</span></li>

 <li>/branches/1.8/channels/chan_iax2.c <span style="color: grey">(373847)</span></li>

 <li>/branches/1.8/channels/sig_analog.c <span style="color: grey">(373847)</span></li>

 <li>/branches/1.8/channels/sig_pri.c <span style="color: grey">(373847)</span></li>

 <li>/branches/1.8/include/asterisk/time.h <span style="color: grey">(373847)</span></li>

 <li>/branches/1.8/main/channel.c <span style="color: grey">(373847)</span></li>

 <li>/branches/1.8/main/pbx.c <span style="color: grey">(373847)</span></li>

 <li>/branches/1.8/main/rtp_engine.c <span style="color: grey">(373847)</span></li>

 <li>/branches/1.8/main/utils.c <span style="color: grey">(373847)</span></li>

 <li>/branches/1.8/res/res_fax.c <span style="color: grey">(373847)</span></li>

</ul>

<p><a href="https://reviewboard.asterisk.org/r/2135/diff/" style="margin-left: 3em;">View Diff</a></p>




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