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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/2135/">https://reviewboard.asterisk.org/r/2135/</a>
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<p style="margin-top: 0;">On October 29th, 2012, 3:56 p.m., <b>rmudgett</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/2135/diff/5/?file=31911#file31911line105" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/apps/app_waitforring.c</a>
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(Diff revision 5)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static char *app = "WaitForRing";</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ms</span> <span class="o">=</span> <span class="mi">99999999</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="k">for</span> <span class="p">(;;)</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="k">while</span><span class="p">(</span><span class="n">ms</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="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="kt">int</span> <span class="n">wait_res</span> <span class="o">=</span> <span class="n">ast_waitfor</span><span class="p">(</span><span class="n">chan</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="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ms</span> <span class="o">=</span> <span class="n">ast_waitfor</span><span class="p">(</span><span class="n">chan</span><span class="p">,</span> <span class="n">ms</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="k">if</span> <span class="p">(</span><span class="n">wait_res</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="#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">ms</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="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">res</span> <span class="o">=</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="n">res</span> <span class="o">=</span> <span class="n">ms</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="#ffffff" 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="#ffffff" 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="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <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="p">}</span> <span class="k">else</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="k">if</span> <span class="p">(</span><span class="n">ms</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="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I'm thinking that this block of changes should be reverted. ast_waitfor() with a -1 timeout cannot return an error condition.
Or just make ast_waitfor() use a large constant timeout in a do/while timeout loop described at ast_waitfor().</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;">With the fix you suggest for ast_waitfor() in channel.c, ast_waitfor() can return an error when given a -1 timeout. With that change in place, do you still think this should be reverted/edited?</pre>
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<p>- Mark</p>
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<p>On October 29th, 2012, 12:13 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 Oct. 29, 2012, 12:13 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'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 "res" instead of "ms" 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'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'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) < 0) {
ast_log(LOG_ERROR, "ERMAHGERD!\n");
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've placed many test calls through items that used timeouts like Dial and Queue with a timeout. I'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>
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<li>/branches/1.8/apps/app_dial.c <span style="color: grey">(375025)</span></li>
<li>/branches/1.8/apps/app_jack.c <span style="color: grey">(374904)</span></li>
<li>/branches/1.8/apps/app_meetme.c <span style="color: grey">(374904)</span></li>
<li>/branches/1.8/apps/app_queue.c <span style="color: grey">(374904)</span></li>
<li>/branches/1.8/apps/app_record.c <span style="color: grey">(374904)</span></li>
<li>/branches/1.8/apps/app_waitforring.c <span style="color: grey">(374904)</span></li>
<li>/branches/1.8/channels/chan_agent.c <span style="color: grey">(374904)</span></li>
<li>/branches/1.8/channels/chan_dahdi.c <span style="color: grey">(374904)</span></li>
<li>/branches/1.8/channels/chan_iax2.c <span style="color: grey">(375025)</span></li>
<li>/branches/1.8/channels/sig_analog.c <span style="color: grey">(374904)</span></li>
<li>/branches/1.8/channels/sig_pri.c <span style="color: grey">(374904)</span></li>
<li>/branches/1.8/include/asterisk/channel.h <span style="color: grey">(374904)</span></li>
<li>/branches/1.8/include/asterisk/time.h <span style="color: grey">(374904)</span></li>
<li>/branches/1.8/main/channel.c <span style="color: grey">(374904)</span></li>
<li>/branches/1.8/main/pbx.c <span style="color: grey">(374904)</span></li>
<li>/branches/1.8/main/rtp_engine.c <span style="color: grey">(374904)</span></li>
<li>/branches/1.8/main/utils.c <span style="color: grey">(374904)</span></li>
<li>/branches/1.8/res/res_fax.c <span style="color: grey">(374904)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/2135/diff/" style="margin-left: 3em;">View Diff</a></p>
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