78 lines
3.7 KiB
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78 lines
3.7 KiB
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<title>The F Reply Packet - Debugging with GDB</title>
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<link rel="up" href="File_002dI_002fO-Remote-Protocol-Extension.html#File_002dI_002fO-Remote-Protocol-Extension" title="File-I/O Remote Protocol Extension">
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<link rel="prev" href="The-F-Request-Packet.html#The-F-Request-Packet" title="The F Request Packet">
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<div class="node">
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<a name="The-F-Reply-Packet"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="The-Ctrl_002dC-Message.html#The-Ctrl_002dC-Message">The Ctrl-C Message</a>,
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Previous: <a rel="previous" accesskey="p" href="The-F-Request-Packet.html#The-F-Request-Packet">The F Request Packet</a>,
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Up: <a rel="up" accesskey="u" href="File_002dI_002fO-Remote-Protocol-Extension.html#File_002dI_002fO-Remote-Protocol-Extension">File-I/O Remote Protocol Extension</a>
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<hr>
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</div>
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<h4 class="subsection">E.13.4 The <code>F</code> Reply Packet</h4>
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<p><a name="index-file_002di_002fo-reply-packet-3599"></a><a name="index-g_t_0040code_007bF_007d-reply-packet-3600"></a>
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The <code>F</code> reply packet has the following format:
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<dl>
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<dt>‘<samp><span class="samp">F</span><var>retcode</var><span class="samp">,</span><var>errno</var><span class="samp">,</span><var>Ctrl-C flag</var><span class="samp">;</span><var>call-specific attachment</var></samp>’<dd>
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<var>retcode</var> is the return code of the system call as hexadecimal value.
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<p><var>errno</var> is the <code>errno</code> set by the call, in protocol-specific
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representation.
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This parameter can be omitted if the call was successful.
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<p><var>Ctrl-C flag</var> is only sent if the user requested a break. In this
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case, <var>errno</var> must be sent as well, even if the call was successful.
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The <var>Ctrl-C flag</var> itself consists of the character ‘<samp><span class="samp">C</span></samp>’:
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<pre class="smallexample"> F0,0,C
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</pre>
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<p class="noindent">or, if the call was interrupted before the host call has been performed:
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<pre class="smallexample"> F-1,4,C
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</pre>
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<p class="noindent">assuming 4 is the protocol-specific representation of <code>EINTR</code>.
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</dl>
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</body></html>
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