<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <!-- 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." --> <!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ --> <head> <title>Pointer Values (Debugging with GDB)</title> <meta name="description" content="Pointer Values (Debugging with GDB)"> <meta name="keywords" content="Pointer Values (Debugging with GDB)"> <meta name="resource-type" content="document"> <meta name="distribution" content="global"> <meta name="Generator" content="makeinfo"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <link href="index.html#Top" rel="start" title="Top"> <link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index"> <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> <link href="Protocol_002dspecific-Representation-of-Datatypes.html#Protocol_002dspecific-Representation-of-Datatypes" rel="up" title="Protocol-specific Representation of Datatypes"> <link href="Memory-Transfer.html#Memory-Transfer" rel="next" title="Memory Transfer"> <link href="Integral-Datatypes.html#Integral-Datatypes" rel="prev" title="Integral Datatypes"> <style type="text/css"> <!-- a.summary-letter {text-decoration: none} blockquote.indentedblock {margin-right: 0em} blockquote.smallindentedblock {margin-right: 0em; font-size: smaller} blockquote.smallquotation {font-size: smaller} div.display {margin-left: 3.2em} div.example {margin-left: 3.2em} div.lisp {margin-left: 3.2em} div.smalldisplay {margin-left: 3.2em} div.smallexample {margin-left: 3.2em} div.smalllisp {margin-left: 3.2em} kbd {font-style: oblique} pre.display {font-family: inherit} pre.format {font-family: inherit} pre.menu-comment {font-family: serif} pre.menu-preformatted {font-family: serif} pre.smalldisplay {font-family: inherit; font-size: smaller} pre.smallexample {font-size: smaller} pre.smallformat {font-family: inherit; font-size: smaller} pre.smalllisp {font-size: smaller} span.nolinebreak {white-space: nowrap} span.roman {font-family: initial; font-weight: normal} span.sansserif {font-family: sans-serif; font-weight: normal} ul.no-bullet {list-style: none} --> </style> </head> <body lang="en"> <a name="Pointer-Values"></a> <div class="header"> <p> Next: <a href="Memory-Transfer.html#Memory-Transfer" accesskey="n" rel="next">Memory Transfer</a>, Previous: <a href="Integral-Datatypes.html#Integral-Datatypes" accesskey="p" rel="prev">Integral Datatypes</a>, Up: <a href="Protocol_002dspecific-Representation-of-Datatypes.html#Protocol_002dspecific-Representation-of-Datatypes" accesskey="u" rel="up">Protocol-specific Representation of Datatypes</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> </div> <hr> <a name="Pointer-Values-1"></a> <h4 class="unnumberedsubsubsec">Pointer Values</h4> <a name="index-pointer-values_002c-in-file_002di_002fo-protocol"></a> <p>Pointers to target data are transmitted as they are. An exception is made for pointers to buffers for which the length isn’t transmitted as part of the function call, namely strings. Strings are transmitted as a pointer/length pair, both as hex values, e.g. </p> <div class="smallexample"> <pre class="smallexample"><code>1aaf/12</code> </pre></div> <p>which is a pointer to data of length 18 bytes at position 0x1aaf. The length is defined as the full string length in bytes, including the trailing null byte. For example, the string <code>"hello world"</code> at address 0x123456 is transmitted as </p> <div class="smallexample"> <pre class="smallexample"><code>123456/d</code> </pre></div> </body> </html>