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<h3 class="section">20.4 Remote Configuration</h3>
<p><a name="index-set-remote-1379"></a><a name="index-show-remote-1380"></a>This section documents the configuration options available when
debugging remote programs. For the options related to the File I/O
extensions of the remote protocol, see <a href="system.html#system">system-call-allowed</a>.
<dl>
<dt><code>set remoteaddresssize </code><var>bits</var><dd><a name="index-address-size-for-remote-targets-1381"></a><a name="index-bits-in-remote-address-1382"></a>Set the maximum size of address in a memory packet to the specified
number of bits. <span class="sc">gdb</span> will mask off the address bits above
that number, when it passes addresses to the remote target. The
default value is the number of bits in the target's address.
<br><dt><code>show remoteaddresssize</code><dd>Show the current value of remote address size in bits.
<br><dt><code>set serial baud </code><var>n</var><dd><a name="index-baud-rate-for-remote-targets-1383"></a>Set the baud rate for the remote serial I/O to <var>n</var> baud. The
value is used to set the speed of the serial port used for debugging
remote targets.
<br><dt><code>show serial baud</code><dd>Show the current speed of the remote connection.
<br><dt><code>set serial parity </code><var>parity</var><dd>Set the parity for the remote serial I/O. Supported values of <var>parity</var> are:
<code>even</code>, <code>none</code>, and <code>odd</code>. The default is <code>none</code>.
<br><dt><code>show serial parity</code><dd>Show the current parity of the serial port.
<br><dt><code>set remotebreak</code><dd><a name="index-interrupt-remote-programs-1384"></a><a name="index-BREAK-signal-instead-of-Ctrl_002dC-1385"></a><a name="set-remotebreak"></a>If set to on, <span class="sc">gdb</span> sends a <code>BREAK</code> signal to the remote
when you type <kbd>Ctrl-c</kbd> to interrupt the program running
on the remote. If set to off, <span class="sc">gdb</span> sends the &lsquo;<samp><span class="samp">Ctrl-C</span></samp>&rsquo;
character instead. The default is off, since most remote systems
expect to see &lsquo;<samp><span class="samp">Ctrl-C</span></samp>&rsquo; as the interrupt signal.
<br><dt><code>show remotebreak</code><dd>Show whether <span class="sc">gdb</span> sends <code>BREAK</code> or &lsquo;<samp><span class="samp">Ctrl-C</span></samp>&rsquo; to
interrupt the remote program.
<br><dt><code>set remoteflow on</code><dt><code>set remoteflow off</code><dd><a name="index-set-remoteflow-1386"></a>Enable or disable hardware flow control (<code>RTS</code>/<code>CTS</code>)
on the serial port used to communicate to the remote target.
<br><dt><code>show remoteflow</code><dd><a name="index-show-remoteflow-1387"></a>Show the current setting of hardware flow control.
<br><dt><code>set remotelogbase </code><var>base</var><dd>Set the base (a.k.a. radix) of logging serial protocol
communications to <var>base</var>. Supported values of <var>base</var> are:
<code>ascii</code>, <code>octal</code>, and <code>hex</code>. The default is
<code>ascii</code>.
<br><dt><code>show remotelogbase</code><dd>Show the current setting of the radix for logging remote serial
protocol.
<br><dt><code>set remotelogfile </code><var>file</var><dd><a name="index-record-serial-communications-on-file-1388"></a>Record remote serial communications on the named <var>file</var>. The
default is not to record at all.
<br><dt><code>show remotelogfile</code><dd>Show the current setting of the file name on which to record the
serial communications.
<br><dt><code>set remotetimeout </code><var>num</var><dd><a name="index-timeout-for-serial-communications-1389"></a><a name="index-remote-timeout-1390"></a>Set the timeout limit to wait for the remote target to respond to
<var>num</var> seconds. The default is 2 seconds.
<br><dt><code>show remotetimeout</code><dd>Show the current number of seconds to wait for the remote target
responses.
<p><a name="index-limit-hardware-breakpoints-and-watchpoints-1391"></a><a name="index-remote-target_002c-limit-break_002d-and-watchpoints-1392"></a><a name="set-remote-hardware_002dwatchpoint_002dlimit"></a><a name="set-remote-hardware_002dbreakpoint_002dlimit"></a><br><dt><code>set remote hardware-watchpoint-limit </code><var>limit</var><dt><code>set remote hardware-breakpoint-limit </code><var>limit</var><dd>Restrict <span class="sc">gdb</span> to using <var>limit</var> remote hardware watchpoints
or breakpoints. The <var>limit</var> can be set to 0 to disable hardware
watchpoints or breakpoints, and <code>unlimited</code> for unlimited
watchpoints or breakpoints.
<br><dt><code>show remote hardware-watchpoint-limit</code><dt><code>show remote hardware-breakpoint-limit</code><dd>Show the current limit for the number of hardware watchpoints or
breakpoints that <span class="sc">gdb</span> can use.
<p><a name="index-limit-hardware-watchpoints-length-1393"></a><a name="index-remote-target_002c-limit-watchpoints-length-1394"></a><a name="set-remote-hardware_002dwatchpoint_002dlength_002dlimit"></a><br><dt><code>set remote hardware-watchpoint-length-limit </code><var>limit</var><dd>Restrict <span class="sc">gdb</span> to using <var>limit</var> bytes for the maximum
length of a remote hardware watchpoint. A <var>limit</var> of 0 disables
hardware watchpoints and <code>unlimited</code> allows watchpoints of any
length.
<br><dt><code>show remote hardware-watchpoint-length-limit</code><dd>Show the current limit (in bytes) of the maximum length of
a remote hardware watchpoint.
<br><dt><code>set remote exec-file </code><var>filename</var><dt><code>show remote exec-file</code><dd><a name="set-remote-exec_002dfile"></a><a name="index-executable-file_002c-for-remote-target-1395"></a>Select the file used for <code>run</code> with <code>target
extended-remote</code>. This should be set to a filename valid on the
target system. If it is not set, the target will use a default
filename (e.g. the last program run).
<br><dt><code>set remote interrupt-sequence</code><dd><a name="index-interrupt-remote-programs-1396"></a><a name="index-select-Ctrl_002dC_002c-BREAK-or-BREAK_002dg-1397"></a>Allow the user to select one of &lsquo;<samp><span class="samp">Ctrl-C</span></samp>&rsquo;, a <code>BREAK</code> or
&lsquo;<samp><span class="samp">BREAK-g</span></samp>&rsquo; as the
sequence to the remote target in order to interrupt the execution.
&lsquo;<samp><span class="samp">Ctrl-C</span></samp>&rsquo; is a default. Some system prefers <code>BREAK</code> which
is high level of serial line for some certain time.
Linux kernel prefers &lsquo;<samp><span class="samp">BREAK-g</span></samp>&rsquo;, a.k.a Magic SysRq g.
It is <code>BREAK</code> signal followed by character <code>g</code>.
<br><dt><code>show interrupt-sequence</code><dd>Show which of &lsquo;<samp><span class="samp">Ctrl-C</span></samp>&rsquo;, <code>BREAK</code> or <code>BREAK-g</code>
is sent by <span class="sc">gdb</span> to interrupt the remote program.
<code>BREAK-g</code> is BREAK signal followed by <code>g</code> and
also known as Magic SysRq g.
<br><dt><code>set remote interrupt-on-connect</code><dd><a name="index-send-interrupt_002dsequence-on-start-1398"></a>Specify whether interrupt-sequence is sent to remote target when
<span class="sc">gdb</span> connects to it. This is mostly needed when you debug
Linux kernel. Linux kernel expects <code>BREAK</code> followed by <code>g</code>
which is known as Magic SysRq g in order to connect <span class="sc">gdb</span>.
<br><dt><code>show interrupt-on-connect</code><dd>Show whether interrupt-sequence is sent
to remote target when <span class="sc">gdb</span> connects to it.
<p><a name="index-set-tcp-1399"></a><a name="index-show-tcp-1400"></a><br><dt><code>set tcp auto-retry on</code><dd><a name="index-auto_002dretry_002c-for-remote-TCP-target-1401"></a>Enable auto-retry for remote TCP connections. This is useful if the remote
debugging agent is launched in parallel with <span class="sc">gdb</span>; there is a race
condition because the agent may not become ready to accept the connection
before <span class="sc">gdb</span> attempts to connect. When auto-retry is
enabled, if the initial attempt to connect fails, <span class="sc">gdb</span> reattempts
to establish the connection using the timeout specified by
<code>set tcp connect-timeout</code>.
<br><dt><code>set tcp auto-retry off</code><dd>Do not auto-retry failed TCP connections.
<br><dt><code>show tcp auto-retry</code><dd>Show the current auto-retry setting.
<br><dt><code>set tcp connect-timeout </code><var>seconds</var><dt><code>set tcp connect-timeout unlimited</code><dd><a name="index-connection-timeout_002c-for-remote-TCP-target-1402"></a><a name="index-timeout_002c-for-remote-target-connection-1403"></a>Set the timeout for establishing a TCP connection to the remote target to
<var>seconds</var>. The timeout affects both polling to retry failed connections
(enabled by <code>set tcp auto-retry on</code>) and waiting for connections
that are merely slow to complete, and represents an approximate cumulative
value. If <var>seconds</var> is <code>unlimited</code>, there is no timeout and
<span class="sc">gdb</span> will keep attempting to establish a connection forever,
unless interrupted with <kbd>Ctrl-c</kbd>. The default is 15 seconds.
<br><dt><code>show tcp connect-timeout</code><dd>Show the current connection timeout setting.
</dl>
<p><a name="index-remote-packets_002c-enabling-and-disabling-1404"></a>The <span class="sc">gdb</span> remote protocol autodetects the packets supported by
your debugging stub. If you need to override the autodetection, you
can use these commands to enable or disable individual packets. Each
packet can be set to &lsquo;<samp><span class="samp">on</span></samp>&rsquo; (the remote target supports this
packet), &lsquo;<samp><span class="samp">off</span></samp>&rsquo; (the remote target does not support this packet),
or &lsquo;<samp><span class="samp">auto</span></samp>&rsquo; (detect remote target support for this packet). They
all default to &lsquo;<samp><span class="samp">auto</span></samp>&rsquo;. For more information about each packet,
see <a href="Remote-Protocol.html#Remote-Protocol">Remote Protocol</a>.
<p>During normal use, you should not have to use any of these commands.
If you do, that may be a bug in your remote debugging stub, or a bug
in <span class="sc">gdb</span>. You may want to report the problem to the
<span class="sc">gdb</span> developers.
<p>For each packet <var>name</var>, the command to enable or disable the
packet is <code>set remote </code><var>name</var><code>-packet</code>. The available settings
are:
<p><table summary=""><tr align="left"><td valign="top" width="28%">Command Name
</td><td valign="top" width="32%">Remote Packet
</td><td valign="top" width="25%">Related Features
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>fetch-register</code>
</td><td valign="top" width="32%"><code>p</code>
</td><td valign="top" width="25%"><code>info registers</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>set-register</code>
</td><td valign="top" width="32%"><code>P</code>
</td><td valign="top" width="25%"><code>set</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>binary-download</code>
</td><td valign="top" width="32%"><code>X</code>
</td><td valign="top" width="25%"><code>load</code>, <code>set</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>read-aux-vector</code>
</td><td valign="top" width="32%"><code>qXfer:auxv:read</code>
</td><td valign="top" width="25%"><code>info auxv</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>symbol-lookup</code>
</td><td valign="top" width="32%"><code>qSymbol</code>
</td><td valign="top" width="25%">Detecting multiple threads
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>attach</code>
</td><td valign="top" width="32%"><code>vAttach</code>
</td><td valign="top" width="25%"><code>attach</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>verbose-resume</code>
</td><td valign="top" width="32%"><code>vCont</code>
</td><td valign="top" width="25%">Stepping or resuming multiple threads
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>run</code>
</td><td valign="top" width="32%"><code>vRun</code>
</td><td valign="top" width="25%"><code>run</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>software-breakpoint</code>
</td><td valign="top" width="32%"><code>Z0</code>
</td><td valign="top" width="25%"><code>break</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>hardware-breakpoint</code>
</td><td valign="top" width="32%"><code>Z1</code>
</td><td valign="top" width="25%"><code>hbreak</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>write-watchpoint</code>
</td><td valign="top" width="32%"><code>Z2</code>
</td><td valign="top" width="25%"><code>watch</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>read-watchpoint</code>
</td><td valign="top" width="32%"><code>Z3</code>
</td><td valign="top" width="25%"><code>rwatch</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>access-watchpoint</code>
</td><td valign="top" width="32%"><code>Z4</code>
</td><td valign="top" width="25%"><code>awatch</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>pid-to-exec-file</code>
</td><td valign="top" width="32%"><code>qXfer:exec-file:read</code>
</td><td valign="top" width="25%"><code>attach</code>, <code>run</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>target-features</code>
</td><td valign="top" width="32%"><code>qXfer:features:read</code>
</td><td valign="top" width="25%"><code>set architecture</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>library-info</code>
</td><td valign="top" width="32%"><code>qXfer:libraries:read</code>
</td><td valign="top" width="25%"><code>info sharedlibrary</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>memory-map</code>
</td><td valign="top" width="32%"><code>qXfer:memory-map:read</code>
</td><td valign="top" width="25%"><code>info mem</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>read-sdata-object</code>
</td><td valign="top" width="32%"><code>qXfer:sdata:read</code>
</td><td valign="top" width="25%"><code>print $_sdata</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>read-spu-object</code>
</td><td valign="top" width="32%"><code>qXfer:spu:read</code>
</td><td valign="top" width="25%"><code>info spu</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>write-spu-object</code>
</td><td valign="top" width="32%"><code>qXfer:spu:write</code>
</td><td valign="top" width="25%"><code>info spu</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>read-siginfo-object</code>
</td><td valign="top" width="32%"><code>qXfer:siginfo:read</code>
</td><td valign="top" width="25%"><code>print $_siginfo</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>write-siginfo-object</code>
</td><td valign="top" width="32%"><code>qXfer:siginfo:write</code>
</td><td valign="top" width="25%"><code>set $_siginfo</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>threads</code>
</td><td valign="top" width="32%"><code>qXfer:threads:read</code>
</td><td valign="top" width="25%"><code>info threads</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>get-thread-local-<br>storage-address</code>
</td><td valign="top" width="32%"><code>qGetTLSAddr</code>
</td><td valign="top" width="25%">Displaying <code>__thread</code> variables
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>get-thread-information-block-address</code>
</td><td valign="top" width="32%"><code>qGetTIBAddr</code>
</td><td valign="top" width="25%">Display MS-Windows Thread Information Block.
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>search-memory</code>
</td><td valign="top" width="32%"><code>qSearch:memory</code>
</td><td valign="top" width="25%"><code>find</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>supported-packets</code>
</td><td valign="top" width="32%"><code>qSupported</code>
</td><td valign="top" width="25%">Remote communications parameters
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>catch-syscalls</code>
</td><td valign="top" width="32%"><code>QCatchSyscalls</code>
</td><td valign="top" width="25%"><code>catch syscall</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>pass-signals</code>
</td><td valign="top" width="32%"><code>QPassSignals</code>
</td><td valign="top" width="25%"><code>handle </code><var>signal</var>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>program-signals</code>
</td><td valign="top" width="32%"><code>QProgramSignals</code>
</td><td valign="top" width="25%"><code>handle </code><var>signal</var>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>hostio-close-packet</code>
</td><td valign="top" width="32%"><code>vFile:close</code>
</td><td valign="top" width="25%"><code>remote get</code>, <code>remote put</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>hostio-open-packet</code>
</td><td valign="top" width="32%"><code>vFile:open</code>
</td><td valign="top" width="25%"><code>remote get</code>, <code>remote put</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>hostio-pread-packet</code>
</td><td valign="top" width="32%"><code>vFile:pread</code>
</td><td valign="top" width="25%"><code>remote get</code>, <code>remote put</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>hostio-pwrite-packet</code>
</td><td valign="top" width="32%"><code>vFile:pwrite</code>
</td><td valign="top" width="25%"><code>remote get</code>, <code>remote put</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>hostio-unlink-packet</code>
</td><td valign="top" width="32%"><code>vFile:unlink</code>
</td><td valign="top" width="25%"><code>remote delete</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>hostio-readlink-packet</code>
</td><td valign="top" width="32%"><code>vFile:readlink</code>
</td><td valign="top" width="25%">Host I/O
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>hostio-fstat-packet</code>
</td><td valign="top" width="32%"><code>vFile:fstat</code>
</td><td valign="top" width="25%">Host I/O
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>hostio-setfs-packet</code>
</td><td valign="top" width="32%"><code>vFile:setfs</code>
</td><td valign="top" width="25%">Host I/O
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>noack-packet</code>
</td><td valign="top" width="32%"><code>QStartNoAckMode</code>
</td><td valign="top" width="25%">Packet acknowledgment
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>osdata</code>
</td><td valign="top" width="32%"><code>qXfer:osdata:read</code>
</td><td valign="top" width="25%"><code>info os</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>query-attached</code>
</td><td valign="top" width="32%"><code>qAttached</code>
</td><td valign="top" width="25%">Querying remote process attach state.
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>trace-buffer-size</code>
</td><td valign="top" width="32%"><code>QTBuffer:size</code>
</td><td valign="top" width="25%"><code>set trace-buffer-size</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>trace-status</code>
</td><td valign="top" width="32%"><code>qTStatus</code>
</td><td valign="top" width="25%"><code>tstatus</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>traceframe-info</code>
</td><td valign="top" width="32%"><code>qXfer:traceframe-info:read</code>
</td><td valign="top" width="25%">Traceframe info
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>install-in-trace</code>
</td><td valign="top" width="32%"><code>InstallInTrace</code>
</td><td valign="top" width="25%">Install tracepoint in tracing
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>disable-randomization</code>
</td><td valign="top" width="32%"><code>QDisableRandomization</code>
</td><td valign="top" width="25%"><code>set disable-randomization</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>startup-with-shell</code>
</td><td valign="top" width="32%"><code>QStartupWithShell</code>
</td><td valign="top" width="25%"><code>set startup-with-shell</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>environment-hex-encoded</code>
</td><td valign="top" width="32%"><code>QEnvironmentHexEncoded</code>
</td><td valign="top" width="25%"><code>set environment</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>environment-unset</code>
</td><td valign="top" width="32%"><code>QEnvironmentUnset</code>
</td><td valign="top" width="25%"><code>unset environment</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>environment-reset</code>
</td><td valign="top" width="32%"><code>QEnvironmentReset</code>
</td><td valign="top" width="25%"><code>Reset the inferior environment (i.e., unset user-set variables)</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>set-working-dir</code>
</td><td valign="top" width="32%"><code>QSetWorkingDir</code>
</td><td valign="top" width="25%"><code>set cwd</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>conditional-breakpoints-packet</code>
</td><td valign="top" width="32%"><code>Z0 and Z1</code>
</td><td valign="top" width="25%"><code>Support for target-side breakpoint condition evaluation</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>multiprocess-extensions</code>
</td><td valign="top" width="32%"><code>multiprocess extensions</code>
</td><td valign="top" width="25%">Debug multiple processes and remote process PID awareness
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>swbreak-feature</code>
</td><td valign="top" width="32%"><code>swbreak stop reason</code>
</td><td valign="top" width="25%"><code>break</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>hwbreak-feature</code>
</td><td valign="top" width="32%"><code>hwbreak stop reason</code>
</td><td valign="top" width="25%"><code>hbreak</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>fork-event-feature</code>
</td><td valign="top" width="32%"><code>fork stop reason</code>
</td><td valign="top" width="25%"><code>fork</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>vfork-event-feature</code>
</td><td valign="top" width="32%"><code>vfork stop reason</code>
</td><td valign="top" width="25%"><code>vfork</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>exec-event-feature</code>
</td><td valign="top" width="32%"><code>exec stop reason</code>
</td><td valign="top" width="25%"><code>exec</code>
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>thread-events</code>
</td><td valign="top" width="32%"><code>QThreadEvents</code>
</td><td valign="top" width="25%">Tracking thread lifetime.
<p><br></td></tr><tr align="left"><td valign="top" width="28%"><code>no-resumed-stop-reply</code>
</td><td valign="top" width="32%"><code>no resumed thread left stop reply</code>
</td><td valign="top" width="25%">Tracking thread lifetime.
<br></td></tr></table>
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