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toolchain-gcc-arm-embedded/share/doc/gcc-arm-none-eabi/html/gdb/Packet-Acknowledgment.html

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  18. <title>Packet Acknowledgment (Debugging with GDB)</title>

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  63. <a name="Packet-Acknowledgment"></a>

  64. <div class="header">

  65. <p>

  66. 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="prev">Remote Non-Stop</a>, Up: <a href="Remote-Protocol.html#Remote-Protocol" accesskey="u" rel="up">Remote Protocol</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>

  67. </div>

  68. <hr>

  69. <a name="Packet-Acknowledgment-1"></a>

  70. <h3 class="section">E.11 Packet Acknowledgment</h3>

  71. 

  72. <a name="index-acknowledgment_002c-for-GDB-remote"></a>

  73. <a name="index-packet-acknowledgment_002c-for-GDB-remote"></a>

  74. <p>By default, when either the host or the target machine receives a packet,

  75. the first response expected is an acknowledgment: either &lsquo;<samp>+</samp>&rsquo; (to indicate

  76. the package was received correctly) or &lsquo;<samp>-</samp>&rsquo; (to request retransmission).

  77. This mechanism allows the <small>GDB</small> remote protocol to operate over

  78. unreliable transport mechanisms, such as a serial line.

  79. </p>

  80. <p>In cases where the transport mechanism is itself reliable (such as a pipe or

  81. TCP connection), the &lsquo;<samp>+</samp>&rsquo;/&lsquo;<samp>-</samp>&rsquo; acknowledgments are redundant.

  82. It may be desirable to disable them in that case to reduce communication

  83. overhead, or for other reasons.  This can be accomplished by means of the

  84. &lsquo;<samp>QStartNoAckMode</samp>&rsquo; packet; see <a href="General-Query-Packets.html#QStartNoAckMode">QStartNoAckMode</a>.

  85. </p>

  86. <p>When in no-acknowledgment mode, neither the stub nor <small>GDB</small> shall send or

  87. expect &lsquo;<samp>+</samp>&rsquo;/&lsquo;<samp>-</samp>&rsquo; protocol acknowledgments.  The packet

  88. and response format still includes the normal checksum, as described in

  89. <a href="Overview.html#Overview">Overview</a>, but the checksum may be ignored by the receiver.

  90. </p>

  91. <p>If the stub supports &lsquo;<samp>QStartNoAckMode</samp>&rsquo; and prefers to operate in

  92. no-acknowledgment mode, it should report that to <small>GDB</small>

  93. by including &lsquo;<samp>QStartNoAckMode+</samp>&rsquo; in its response to &lsquo;<samp>qSupported</samp>&rsquo;;

  94. see <a href="General-Query-Packets.html#qSupported">qSupported</a>.

  95. If <small>GDB</small> also supports &lsquo;<samp>QStartNoAckMode</samp>&rsquo; and it has not been

  96. disabled via the <code>set remote noack-packet off</code> command

  97. (see <a href="Remote-Configuration.html#Remote-Configuration">Remote Configuration</a>),

  98. <small>GDB</small> may then send a &lsquo;<samp>QStartNoAckMode</samp>&rsquo; packet to the stub.

  99. Only then may the stub actually turn off packet acknowledgments.

  100. <small>GDB</small> sends a final &lsquo;<samp>+</samp>&rsquo; acknowledgment of the stub&rsquo;s &lsquo;<samp>OK</samp>&rsquo;

  101. response, which can be safely ignored by the stub.

  102. </p>

  103. <p>Note that <code>set remote noack-packet</code> command only affects negotiation

  104. between <small>GDB</small> and the stub when subsequent connections are made;

  105. it does not affect the protocol acknowledgment state for any current

  106. connection.

  107. Since &lsquo;<samp>+</samp>&rsquo;/&lsquo;<samp>-</samp>&rsquo; acknowledgments are enabled by default when a

  108. new connection is established,

  109. there is also no protocol request to re-enable the acknowledgments

  110. for the current connection, once disabled.

  111. </p>

  112. <hr>

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