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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/4530/">https://reviewboard.asterisk.org/r/4530/</a>
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<p style="margin-top: 0;">On March 27th, 2015, 2:11 a.m. CET, <b>Matt Jordan</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/4530/diff/1/?file=72936#file72936line357" style="color: black; font-weight: bold; text-decoration: underline;">/branches/13/main/stdtime/localtime.c</a>
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(Diff revision 1)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static void *inotify_daemon(void *data)</pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="k">struct</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="tb"> </span><span class="k">struct</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="tb"> </span><span class="tb"> </span><span class="k">struct</span> <span class="n">inotify_event</span> <span class="n">iev</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="tb"> </span><span class="tb"> </span><span class="kt">char</span> <span class="n">name</span><span class="p">[</span><span class="n">FILENAME_MAX</span> <span class="o">+</span> <span class="mi">1</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="tb"> </span><span class="tb"> </span><span class="kt">char</span> <span class="n">name</span><span class="p">[</span><span class="n">FILENAME_MAX</span> <span class="o">+</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="tb"> </span><span class="tb"> </span><span class="k">struct</span> <span class="n">inotify_event</span> <span class="n">iev</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="tb"> </span><span class="p">}</span> <span class="n">buf</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="tb"> </span><span class="p">}</span> <span class="n">buf</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;">Just curious, what was the compiler warning on this one?</pre>
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<p>On March 27th, 2015, 11:24 a.m. CET, <b>Diederik de Groot</b> wrote:</p>
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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;">There can only be one variable size struct element and it has to be at the last position. Having them anywhere in the struct is a gcc extension.</pre>
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<p>On March 27th, 2015, 5:04 p.m. CET, <b>rmudgett</b> wrote:</p>
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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 not a valid fix!! The buf.name field is supposed to be the extra space that the buf.iev.name field represents.</pre>
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<p>On March 27th, 2015, 5:05 p.m. CET, <b>rmudgett</b> wrote:</p>
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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'd suggest using ast_alloca() or alloca() to create space for buf instead.</pre>
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<p>On March 27th, 2015, 5:17 p.m. CET, <b>Diederik de Groot</b> wrote:</p>
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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 did not interpret this correctly i guess. Doesn't this mean a union should have been used instead ?
Can you give me an example of how you would restructure this using alloca. </pre>
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<p>On March 27th, 2015, 5:39 p.m. CET, <b>rmudgett</b> wrote:</p>
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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;">Unions have all members overlapping each other. That is not what is needed here. The struct inotify_event has a last member named name and the locally defined struct for buf is reserving space for buf.iev.name with the buf.name array.
Since clang is complaining about this we need to change the definition of buf and the usage of it in the rest of the function.
struct inotify_event *buf;
size_t real_sizeof_buf = sizeof(*buf) + FILENAME_MAX + 1;
buf = ast_alloca(real_sizeof_buf);
Where used:
sizeof(buf) becomes real_sizeof_buf
sizeof(buf.iev) becomes sizeof(*buf)
buf.iev.wd becomes buf->wd
Since buf is not a good name because it is now misleading, renaming buf to iev would be better.</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;">Thanks... Resolves the issue and even looks cleaner than the original :-)</pre>
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<p>- Diederik</p>
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<p>On March 26th, 2015, 7:12 p.m. CET, Diederik de Groot wrote:</p>
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<div>Review request for Asterisk Developers.</div>
<div>By Diederik de Groot.</div>
<p style="color: grey;"><i>Updated March 26, 2015, 7:12 p.m.</i></p>
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<b style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Bugs: </b>
<a href="https://issues.asterisk.org/jira/browse/ASTERISK-24917">ASTERISK-24917</a>
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<b style="color: #575012; font-size: 10pt;">Repository: </b>
Asterisk
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<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;">clang's static analyzer will throw quite a number warnings / errors during compilation, some of which can be very helpfull in finding corner-case bugs\nclang compiler warning:-Wgnu-variable-sized-type-not-at-end</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>/branches/13/main/stdtime/localtime.c <span style="color: grey">(433444)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/4530/diff/" style="margin-left: 3em;">View Diff</a></p>
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