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| <h4 class="subsection">D.14.4 The <code>F</code> Reply Packet</h4> |
| |
| <p><a name="index-file_002di_002fo-reply-packet-2499"></a><a name="index-g_t_0040code_007bF_007d-reply-packet-2500"></a> |
| The <code>F</code> reply packet has the following format: |
| |
| <dl> |
| <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> |
| <var>retcode</var> is the return code of the system call as hexadecimal value. |
| |
| <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><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><span class="samp">C</span></samp>’: |
| |
| <pre class="smallexample"> F0,0,C |
| </pre> |
| <p class="noindent">or, if the call was interrupted before the host call has been performed: |
| |
| <pre class="smallexample"> F-1,4,C |
| </pre> |
| <p class="noindent">assuming 4 is the protocol-specific representation of <code>EINTR</code>. |
| |
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