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