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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/1956/">https://reviewboard.asterisk.org/r/1956/</a>
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<p style="margin-top: 0;">On June 4th, 2012, 9:48 a.m., <b>jrose</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1956/diff/1/?file=28436#file28436line134" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/apps/app_system.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 int system_exec_helper(struct ast_channel *chan, const char *data, int failmode)</pre></td>
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<th bgcolor="#e9eaa8" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2">134</font></th>
<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_log</span><span class="p">(</span><span class="n">LOG_WARNING</span><span class="p">,</span> <span class="s">"Unable to execute '%s'</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> <span class="p">(</span><span class="kt">char</span> <span class="o">*</span><span class="p">)</span><span class="n">data</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_log</span><span class="p">(</span><span class="n">LOG_WARNING</span><span class="p">,</span> <span class="s">"Unable to execute '%s'<span class="hl">: (execution failure)</span></span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> <span class="p">(</span><span class="kt">char</span> <span class="o">*</span><span class="p">)</span><span class="n">data</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">pbx_builtin_setvar_helper</span><span class="p">(</span><span class="n">chan</span><span class="p">,</span> <span class="n">chanvar</span><span class="p">,</span> <span class="s">"FAILURE"</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">res</span> <span class="o">=</span> <span class="n">failmode</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> <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="n">res</span> <span class="o">==</span> <span class="mi">126</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>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_log</span><span class="p">(</span><span class="n">LOG_WARNING</span><span class="p">,</span> <span class="s">"Unable to execute '%s': (permission denied)</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> <span class="p">(</span><span class="kt">char</span> <span class="o">*</span><span class="p">)</span><span class="n">data</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;">This looks mostly fine, but I'm having trouble finding any particular resource which definitively pegs this particular status from wait4 as indicating what is implied. I don't know.
Looking at the man page for wait4, I think reading specific values to evaluate success or failure might be the wrong way to go and instead perhaps the macros listed on the man page might be more proper.</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;">Yes, but since ast_safe_system executes /bin/sh, he's not relying on wait4 returning a special status, but on the Bourne shell itself returning a special status. It would appear that on his platform, /bin/sh is bash, which does have this behavior. Unfortunately, it's not portable, because many systems do not have bash as /bin/sh, including many versions of Linux derived from Debian, where /bin/sh is dash. On most commercial versions of Unix, including Solaris, for which we have traditionally have had some support, /bin/sh is also not bash. So I think that this fails on portability.</pre>
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<p>- Tilghman</p>
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<p>On June 4th, 2012, 9:23 a.m., Dennis Martinez wrote:</p>
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<div>Review request for Asterisk Developers.</div>
<div>By Dennis Martinez.</div>
<p style="color: grey;"><i>Updated June 4, 2012, 9:23 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;">I created a patch that improves the app_system behavior. The patch should make this application to check if a command failed to execute due to permission denied.</pre>
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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-19935">ASTERISK-19935</a>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>/trunk/apps/app_system.c <span style="color: grey">(368031)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/1956/diff/" style="margin-left: 3em;">View Diff</a></p>
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