| <html lang="en"> |
| <head> |
| <title>The F Reply Packet - Debugging with GDB</title> |
| <meta http-equiv="Content-Type" content="text/html"> |
| <meta name="description" content="Debugging with GDB"> |
| <meta name="generator" content="makeinfo 4.13"> |
| <link title="Top" rel="start" href="index.html#Top"> |
| <link rel="up" href="File_002dI_002fO-Remote-Protocol-Extension.html#File_002dI_002fO-Remote-Protocol-Extension" title="File-I/O Remote Protocol Extension"> |
| <link rel="prev" href="The-F-Request-Packet.html#The-F-Request-Packet" title="The F Request Packet"> |
| <link rel="next" href="The-Ctrl_002dC-Message.html#The-Ctrl_002dC-Message" title="The Ctrl-C Message"> |
| <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> |
| <!-- |
| Copyright (C) 1988-2019 Free Software Foundation, Inc. |
| |
| Permission is granted to copy, distribute and/or modify this document |
| under the terms of the GNU Free Documentation License, Version 1.3 or |
| any later version published by the Free Software Foundation; with the |
| Invariant Sections being ``Free Software'' and ``Free Software Needs |
| Free Documentation'', with the Front-Cover Texts being ``A GNU Manual,'' |
| and with the Back-Cover Texts as in (a) below. |
| |
| (a) The FSF's Back-Cover Text is: ``You are free to copy and modify |
| this GNU Manual. Buying copies from GNU Press supports the FSF in |
| developing GNU and promoting software freedom.'' |
| --> |
| <meta http-equiv="Content-Style-Type" content="text/css"> |
| <style type="text/css"><!-- |
| pre.display { font-family:inherit } |
| pre.format { font-family:inherit } |
| pre.smalldisplay { font-family:inherit; font-size:smaller } |
| pre.smallformat { font-family:inherit; font-size:smaller } |
| pre.smallexample { font-size:smaller } |
| pre.smalllisp { font-size:smaller } |
| span.sc { font-variant:small-caps } |
| span.roman { font-family:serif; font-weight:normal; } |
| span.sansserif { font-family:sans-serif; font-weight:normal; } |
| --></style> |
| </head> |
| <body> |
| <div class="node"> |
| <a name="The-F-Reply-Packet"></a> |
| <p> |
| Next: <a rel="next" accesskey="n" href="The-Ctrl_002dC-Message.html#The-Ctrl_002dC-Message">The Ctrl-C Message</a>, |
| Previous: <a rel="previous" accesskey="p" href="The-F-Request-Packet.html#The-F-Request-Packet">The F Request Packet</a>, |
| 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> |
| <hr> |
| </div> |
| |
| <h4 class="subsection">E.13.4 The <code>F</code> Reply Packet</h4> |
| |
| <p><a name="index-file_002di_002fo-reply-packet-3599"></a><a name="index-g_t_0040code_007bF_007d-reply-packet-3600"></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>. |
| |
| </dl> |
| |
| </body></html> |
| |
