diff options
| author | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
|---|---|---|
| committer | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
| commit | 6ce4ebed87858ecdd79a1091367c6e961055daa9 (patch) | |
| tree | 1c2a6a60531acf791531bbd9c8ac14c23ef8a66c /share/doc/gdb/Packet-Acknowledgment.html | |
https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads
Change-Id: I7303388733328cd98ab9aa3c30236db67f2e9e9c
Diffstat (limited to 'share/doc/gdb/Packet-Acknowledgment.html')
| -rw-r--r-- | share/doc/gdb/Packet-Acknowledgment.html | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/share/doc/gdb/Packet-Acknowledgment.html b/share/doc/gdb/Packet-Acknowledgment.html new file mode 100644 index 0000000..20549e5 --- /dev/null +++ b/share/doc/gdb/Packet-Acknowledgment.html @@ -0,0 +1,122 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> +<!-- Copyright (C) 1988-2023 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 5.1, http://www.gnu.org/software/texinfo/ --> +<head> +<title>Debugging with GDB: Packet Acknowledgment</title> + +<meta name="description" content="Debugging with GDB: Packet Acknowledgment"> +<meta name="keywords" content="Debugging with GDB: Packet Acknowledgment"> +<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="Remote-Protocol.html#Remote-Protocol" rel="up" title="Remote Protocol"> +<link href="Examples.html#Examples" rel="next" title="Examples"> +<link href="Remote-Non_002dStop.html#Remote-Non_002dStop" rel="previous" title="Remote Non-Stop"> +<style type="text/css"> +<!-- +a.summary-letter {text-decoration: none} +blockquote.smallquotation {font-size: smaller} +div.display {margin-left: 3.2em} +div.example {margin-left: 3.2em} +div.indentedblock {margin-left: 3.2em} +div.lisp {margin-left: 3.2em} +div.smalldisplay {margin-left: 3.2em} +div.smallexample {margin-left: 3.2em} +div.smallindentedblock {margin-left: 3.2em; font-size: smaller} +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.nocodebreak {white-space:nowrap} +span.nolinebreak {white-space:nowrap} +span.roman {font-family:serif; font-weight:normal} +span.sansserif {font-family:sans-serif; font-weight:normal} +ul.no-bullet {list-style: none} +--> +</style> + + +</head> + +<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> +<a name="Packet-Acknowledgment"></a> +<div class="header"> +<p> +Next: <a href="Examples.html#Examples" accesskey="n" rel="next">Examples</a>, Previous: <a href="Remote-Non_002dStop.html#Remote-Non_002dStop" accesskey="p" rel="previous">Remote Non-Stop</a>, Up: <a href="Remote-Protocol.html#Remote-Protocol" accesskey="u" rel="up">Remote Protocol</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="Packet-Acknowledgment-1"></a> +<h3 class="section">E.11 Packet Acknowledgment</h3> + +<a name="index-acknowledgment_002c-for-GDB-remote"></a> +<a name="index-packet-acknowledgment_002c-for-GDB-remote"></a> +<p>By default, when either the host or the target machine receives a packet, +the first response expected is an acknowledgment: either ‘<samp>+</samp>’ (to indicate +the package was received correctly) or ‘<samp>-</samp>’ (to request retransmission). +This mechanism allows the <small>GDB</small> remote protocol to operate over +unreliable transport mechanisms, such as a serial line. +</p> +<p>In cases where the transport mechanism is itself reliable (such as a pipe or +TCP connection), the ‘<samp>+</samp>’/‘<samp>-</samp>’ acknowledgments are redundant. +It may be desirable to disable them in that case to reduce communication +overhead, or for other reasons. This can be accomplished by means of the +‘<samp>QStartNoAckMode</samp>’ packet; see <a href="General-Query-Packets.html#QStartNoAckMode">QStartNoAckMode</a>. +</p> +<p>When in no-acknowledgment mode, neither the stub nor <small>GDB</small> shall send or +expect ‘<samp>+</samp>’/‘<samp>-</samp>’ protocol acknowledgments. The packet +and response format still includes the normal checksum, as described in +<a href="Overview.html#Overview">Overview</a>, but the checksum may be ignored by the receiver. +</p> +<p>If the stub supports ‘<samp>QStartNoAckMode</samp>’ and prefers to operate in +no-acknowledgment mode, it should report that to <small>GDB</small> +by including ‘<samp>QStartNoAckMode+</samp>’ in its response to ‘<samp>qSupported</samp>’; +see <a href="General-Query-Packets.html#qSupported">qSupported</a>. +If <small>GDB</small> also supports ‘<samp>QStartNoAckMode</samp>’ and it has not been +disabled via the <code>set remote noack-packet off</code> command +(see <a href="Remote-Configuration.html#Remote-Configuration">Remote Configuration</a>), +<small>GDB</small> may then send a ‘<samp>QStartNoAckMode</samp>’ packet to the stub. +Only then may the stub actually turn off packet acknowledgments. +<small>GDB</small> sends a final ‘<samp>+</samp>’ acknowledgment of the stub’s ‘<samp>OK</samp>’ +response, which can be safely ignored by the stub. +</p> +<p>Note that <code>set remote noack-packet</code> command only affects negotiation +between <small>GDB</small> and the stub when subsequent connections are made; +it does not affect the protocol acknowledgment state for any current +connection. +Since ‘<samp>+</samp>’/‘<samp>-</samp>’ acknowledgments are enabled by default when a +new connection is established, +there is also no protocol request to re-enable the acknowledgments +for the current connection, once disabled. +</p> +<hr> +<div class="header"> +<p> +Next: <a href="Examples.html#Examples" accesskey="n" rel="next">Examples</a>, Previous: <a href="Remote-Non_002dStop.html#Remote-Non_002dStop" accesskey="p" rel="previous">Remote Non-Stop</a>, Up: <a href="Remote-Protocol.html#Remote-Protocol" accesskey="u" rel="up">Remote Protocol</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> + + + +</body> +</html> |