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17<title>Debugging with GDB: The F Request Packet</title>
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67Next: <a href="The-F-Reply-Packet.html#The-F-Reply-Packet" accesskey="n" rel="next">The F Reply Packet</a>, Previous: <a href="Protocol-Basics.html#Protocol-Basics" accesskey="p" rel="previous">Protocol Basics</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> &nbsp; [<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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70<a name="The-F-Request-Packet-1"></a>
71<h4 class="subsection">E.13.3 The <code>F</code> Request Packet</h4>
72<a name="index-file_002di_002fo-request-packet"></a>
73<a name="index-F-request-packet"></a>
74
75<p>The <code>F</code> request packet has the following format:
76</p>
77<dl compact="compact">
78<dt>&lsquo;<samp>F<var>call-id</var>,<var>parameter&hellip;</var></samp>&rsquo;</dt>
79<dd>
80<p><var>call-id</var> is the identifier to indicate the host system call to be called.
81This is just the name of the function.
82</p>
83<p><var>parameter&hellip;</var> are the parameters to the system call.
84Parameters are hexadecimal integer values, either the actual values in case
85of scalar datatypes, pointers to target buffer space in case of compound
86datatypes and unspecified memory areas, or pointer/length pairs in case
87of string parameters.  These are appended to the <var>call-id</var> as a
88comma-delimited list.  All values are transmitted in ASCII
89string representation, pointer/length pairs separated by a slash.
90</p>
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