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<a name="Server"></a>
<div class="header">
<p>
Next: <a href="Remote-Configuration.html#Remote-Configuration" accesskey="n" rel="next">Remote Configuration</a>, Previous: <a href="File-Transfer.html#File-Transfer" accesskey="p" rel="prev">File Transfer</a>, Up: <a href="Remote-Debugging.html#Remote-Debugging" accesskey="u" rel="up">Remote Debugging</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>
</div>
<hr>
<a name="Using-the-gdbserver-Program"></a>
<h3 class="section">20.3 Using the <code>gdbserver</code> Program</h3>

<a name="index-gdbserver"></a>
<a name="index-remote-connection-without-stubs"></a>
<p><code>gdbserver</code> is a control program for Unix-like systems, which
allows you to connect your program with a remote <small>GDB</small> via
<code>target remote</code> or <code>target extended-remote</code>&mdash;but without
linking in the usual debugging stub.
</p>
<p><code>gdbserver</code> is not a complete replacement for the debugging stubs,
because it requires essentially the same operating-system facilities
that <small>GDB</small> itself does.  In fact, a system that can run
<code>gdbserver</code> to connect to a remote <small>GDB</small> could also run
<small>GDB</small> locally!  <code>gdbserver</code> is sometimes useful nevertheless,
because it is a much smaller program than <small>GDB</small> itself.  It is
also easier to port than all of <small>GDB</small>, so you may be able to get
started more quickly on a new system by using <code>gdbserver</code>.
Finally, if you develop code for real-time systems, you may find that
the tradeoffs involved in real-time operation make it more convenient to
do as much development work as possible on another system, for example
by cross-compiling.  You can use <code>gdbserver</code> to make a similar
choice for debugging.
</p>
<p><small>GDB</small> and <code>gdbserver</code> communicate via either a serial line
or a TCP connection, using the standard <small>GDB</small> remote serial
protocol.
</p>
<blockquote>
<p><em>Warning:</em> <code>gdbserver</code> does not have any built-in security.
Do not run <code>gdbserver</code> connected to any public network; a
<small>GDB</small> connection to <code>gdbserver</code> provides access to the
target system with the same privileges as the user running
<code>gdbserver</code>.
</p></blockquote>

<a name="Running-gdbserver"></a><a name="Running-gdbserver-1"></a>
<h4 class="subsection">20.3.1 Running <code>gdbserver</code></h4>
<a name="index-arguments_002c-to-gdbserver"></a>
<a name="index-gdbserver_002c-command_002dline-arguments"></a>

<p>Run <code>gdbserver</code> on the target system.  You need a copy of the
program you want to debug, including any libraries it requires.
<code>gdbserver</code> does not need your program&rsquo;s symbol table, so you can
strip the program if necessary to save space.  <small>GDB</small> on the host
system does all the symbol handling.
</p>
<p>To use the server, you must tell it how to communicate with <small>GDB</small>;
the name of your program; and the arguments for your program.  The usual
syntax is:
</p>
<div class="smallexample">
<pre class="smallexample">target&gt; gdbserver <var>comm</var> <var>program</var> [ <var>args</var> &hellip; ]
</pre></div>

<p><var>comm</var> is either a device name (to use a serial line), or a TCP
hostname and portnumber, or <code>-</code> or <code>stdio</code> to use
stdin/stdout of <code>gdbserver</code>.
For example, to debug Emacs with the argument
&lsquo;<samp>foo.txt</samp>&rsquo; and communicate with <small>GDB</small> over the serial port
<samp>/dev/com1</samp>:
</p>
<div class="smallexample">
<pre class="smallexample">target&gt; gdbserver /dev/com1 emacs foo.txt
</pre></div>

<p><code>gdbserver</code> waits passively for the host <small>GDB</small> to communicate
with it.
</p>
<p>To use a TCP connection instead of a serial line:
</p>
<div class="smallexample">
<pre class="smallexample">target&gt; gdbserver host:2345 emacs foo.txt
</pre></div>

<p>The only difference from the previous example is the first argument,
specifying that you are communicating with the host <small>GDB</small> via
TCP.  The &lsquo;<samp>host:2345</samp>&rsquo; argument means that <code>gdbserver</code> is to
expect a TCP connection from machine &lsquo;<samp>host</samp>&rsquo; to local TCP port 2345.
(Currently, the &lsquo;<samp>host</samp>&rsquo; part is ignored.)  You can choose any number
you want for the port number as long as it does not conflict with any
TCP ports already in use on the target system (for example, <code>23</code> is
reserved for <code>telnet</code>).<a name="DOCF15" href="#FOOT15"><sup>15</sup></a>  You must use the same port number with the host <small>GDB</small>
<code>target remote</code> command.
</p>
<p>The <code>stdio</code> connection is useful when starting <code>gdbserver</code>
with ssh:
</p>
<div class="smallexample">
<pre class="smallexample">(gdb) target remote | ssh -T hostname gdbserver - hello
</pre></div>

<p>The &lsquo;<samp>-T</samp>&rsquo; option to ssh is provided because we don&rsquo;t need a remote pty,
and we don&rsquo;t want escape-character handling.  Ssh does this by default when
a command is provided, the flag is provided to make it explicit.
You could elide it if you want to.
</p>
<p>Programs started with stdio-connected gdbserver have <samp>/dev/null</samp> for
<code>stdin</code>, and <code>stdout</code>,<code>stderr</code> are sent back to gdb for
display through a pipe connected to gdbserver.
Both <code>stdout</code> and <code>stderr</code> use the same pipe.
</p>
<a name="Attaching-to-a-program"></a><a name="Attaching-to-a-Running-Program"></a>
<h4 class="subsubsection">20.3.1.1 Attaching to a Running Program</h4>
<a name="index-attach-to-a-program_002c-gdbserver"></a>
<a name="index-_002d_002dattach_002c-gdbserver-option"></a>

<p>On some targets, <code>gdbserver</code> can also attach to running programs.
This is accomplished via the <code>--attach</code> argument.  The syntax is:
</p>
<div class="smallexample">
<pre class="smallexample">target&gt; gdbserver --attach <var>comm</var> <var>pid</var>
</pre></div>

<p><var>pid</var> is the process ID of a currently running process.  It isn&rsquo;t
necessary to point <code>gdbserver</code> at a binary for the running process.
</p>
<p>In <code>target extended-remote</code> mode, you can also attach using the
<small>GDB</small> attach command
(see <a href="Connecting.html#Attaching-in-Types-of-Remote-Connections">Attaching in Types of Remote Connections</a>).
</p>
<a name="index-pidof"></a>
<p>You can debug processes by name instead of process ID if your target has the
<code>pidof</code> utility:
</p>
<div class="smallexample">
<pre class="smallexample">target&gt; gdbserver --attach <var>comm</var> `pidof <var>program</var>`
</pre></div>

<p>In case more than one copy of <var>program</var> is running, or <var>program</var>
has multiple threads, most versions of <code>pidof</code> support the
<code>-s</code> option to only return the first process ID.
</p>
<a name="TCP-port-allocation-lifecycle-of-gdbserver"></a>
<h4 class="subsubsection">20.3.1.2 TCP port allocation lifecycle of <code>gdbserver</code></h4>

<p>This section applies only when <code>gdbserver</code> is run to listen on a TCP
port.
</p>
<p><code>gdbserver</code> normally terminates after all of its debugged processes have
terminated in <kbd>target remote</kbd> mode.  On the other hand, for <kbd>target
extended-remote</kbd>, <code>gdbserver</code> stays running even with no processes left.
<small>GDB</small> normally terminates the spawned debugged process on its exit,
which normally also terminates <code>gdbserver</code> in the <kbd>target remote</kbd>
mode.  Therefore, when the connection drops unexpectedly, and <small>GDB</small>
cannot ask <code>gdbserver</code> to kill its debugged processes, <code>gdbserver</code>
stays running even in the <kbd>target remote</kbd> mode.
</p>
<p>When <code>gdbserver</code> stays running, <small>GDB</small> can connect to it again later.
Such reconnecting is useful for features like <a href="Starting-and-Stopping-Trace-Experiments.html#disconnected-tracing">disconnected tracing</a>.  For
completeness, at most one <small>GDB</small> can be connected at a time.
</p>
<a name="index-_002d_002donce_002c-gdbserver-option"></a>
<p>By default, <code>gdbserver</code> keeps the listening TCP port open, so that
subsequent connections are possible.  However, if you start <code>gdbserver</code>
with the <samp>--once</samp> option, it will stop listening for any further
connection attempts after connecting to the first <small>GDB</small> session.  This
means no further connections to <code>gdbserver</code> will be possible after the
first one.  It also means <code>gdbserver</code> will terminate after the first
connection with remote <small>GDB</small> has closed, even for unexpectedly closed
connections and even in the <kbd>target extended-remote</kbd> mode.  The
<samp>--once</samp> option allows reusing the same port number for connecting to
multiple instances of <code>gdbserver</code> running on the same host, since each
instance closes its port after the first connection.
</p>
<a name="Other-Command_002dLine-Arguments-for-gdbserver"></a><a name="Other-Command_002dLine-Arguments-for-gdbserver-1"></a>
<h4 class="subsubsection">20.3.1.3 Other Command-Line Arguments for <code>gdbserver</code></h4>

<p>You can use the <samp>--multi</samp> option to start <code>gdbserver</code> without
specifying a program to debug or a process to attach to.  Then you can
attach in <code>target extended-remote</code> mode and run or attach to a
program.  For more information,
see <a href="Connecting.html#g_t_002d_002dmulti-Option-in-Types-of-Remote-Connnections">--multi Option in Types of Remote Connnections</a>.
</p>
<a name="index-_002d_002ddebug_002c-gdbserver-option"></a>
<p>The <samp>--debug</samp> option tells <code>gdbserver</code> to display extra
status information about the debugging process.
<a name="index-_002d_002dremote_002ddebug_002c-gdbserver-option"></a>
The <samp>--remote-debug</samp> option tells <code>gdbserver</code> to display
remote protocol debug output.  These options are intended for
<code>gdbserver</code> development and for bug reports to the developers.
</p>
<a name="index-_002d_002ddebug_002dformat_002c-gdbserver-option"></a>
<p>The <samp>--debug-format=option1[,option2,...]</samp> option tells
<code>gdbserver</code> to include additional information in each output.
Possible options are:
</p>
<dl compact="compact">
<dt><code>none</code></dt>
<dd><p>Turn off all extra information in debugging output.
</p></dd>
<dt><code>all</code></dt>
<dd><p>Turn on all extra information in debugging output.
</p></dd>
<dt><code>timestamps</code></dt>
<dd><p>Include a timestamp in each line of debugging output.
</p></dd>
</dl>

<p>Options are processed in order.  Thus, for example, if <samp>none</samp>
appears last then no additional information is added to debugging output.
</p>
<a name="index-_002d_002dwrapper_002c-gdbserver-option"></a>
<p>The <samp>--wrapper</samp> option specifies a wrapper to launch programs
for debugging.  The option should be followed by the name of the
wrapper, then any command-line arguments to pass to the wrapper, then
<kbd>--</kbd> indicating the end of the wrapper arguments.
</p>
<p><code>gdbserver</code> runs the specified wrapper program with a combined
command line including the wrapper arguments, then the name of the
program to debug, then any arguments to the program.  The wrapper
runs until it executes your program, and then <small>GDB</small> gains control.
</p>
<p>You can use any program that eventually calls <code>execve</code> with
its arguments as a wrapper.  Several standard Unix utilities do
this, e.g. <code>env</code> and <code>nohup</code>.  Any Unix shell script ending
with <code>exec &quot;$@&quot;</code> will also work.
</p>
<p>For example, you can use <code>env</code> to pass an environment variable to
the debugged program, without setting the variable in <code>gdbserver</code>&rsquo;s
environment:
</p>
<div class="smallexample">
<pre class="smallexample">$ gdbserver --wrapper env LD_PRELOAD=libtest.so -- :2222 ./testprog
</pre></div>

<a name="index-_002d_002dselftest"></a>
<p>The <samp>--selftest</samp> option runs the self tests in <code>gdbserver</code>:
</p>
<div class="smallexample">
<pre class="smallexample">$ gdbserver --selftest
Ran 2 unit tests, 0 failed
</pre></div>

<p>These tests are disabled in release.
</p><a name="Connecting-to-gdbserver"></a>
<h4 class="subsection">20.3.2 Connecting to <code>gdbserver</code></h4>

<p>The basic procedure for connecting to the remote target is:
</p><ul>
<li> Run <small>GDB</small> on the host system.

</li><li> Make sure you have the necessary symbol files
(see <a href="Connecting.html#Host-and-target-files">Host and target files</a>).
Load symbols for your application using the <code>file</code> command before you
connect.  Use <code>set sysroot</code> to locate target libraries (unless your
<small>GDB</small> was compiled with the correct sysroot using
<code>--with-sysroot</code>).

</li><li> Connect to your target (see <a href="Connecting.html#Connecting">Connecting to a Remote Target</a>).
For TCP connections, you must start up <code>gdbserver</code> prior to using
the <code>target</code> command.  Otherwise you may get an error whose
text depends on the host system, but which usually looks something like
&lsquo;<samp>Connection refused</samp>&rsquo;.  Don&rsquo;t use the <code>load</code>
command in <small>GDB</small> when using <code>target remote</code> mode, since the
program is already on the target.

</li></ul>

<a name="Monitor-Commands-for-gdbserver"></a><a name="Monitor-Commands-for-gdbserver-1"></a>
<h4 class="subsection">20.3.3 Monitor Commands for <code>gdbserver</code></h4>
<a name="index-monitor-commands_002c-for-gdbserver"></a>

<p>During a <small>GDB</small> session using <code>gdbserver</code>, you can use the
<code>monitor</code> command to send special requests to <code>gdbserver</code>.
Here are the available commands.
</p>
<dl compact="compact">
<dt><code>monitor help</code></dt>
<dd><p>List the available monitor commands.
</p>
</dd>
<dt><code>monitor set debug 0</code></dt>
<dt><code>monitor set debug 1</code></dt>
<dd><p>Disable or enable general debugging messages.
</p>
</dd>
<dt><code>monitor set remote-debug 0</code></dt>
<dt><code>monitor set remote-debug 1</code></dt>
<dd><p>Disable or enable specific debugging messages associated with the remote
protocol (see <a href="Remote-Protocol.html#Remote-Protocol">Remote Protocol</a>).
</p>
</dd>
<dt><code>monitor set debug-format option1<span class="roman">[</span>,option2,...<span class="roman">]</span></code></dt>
<dd><p>Specify additional text to add to debugging messages.
Possible options are:
</p>
<dl compact="compact">
<dt><code>none</code></dt>
<dd><p>Turn off all extra information in debugging output.
</p></dd>
<dt><code>all</code></dt>
<dd><p>Turn on all extra information in debugging output.
</p></dd>
<dt><code>timestamps</code></dt>
<dd><p>Include a timestamp in each line of debugging output.
</p></dd>
</dl>

<p>Options are processed in order.  Thus, for example, if <samp>none</samp>
appears last then no additional information is added to debugging output.
</p>
</dd>
<dt><code>monitor set libthread-db-search-path [PATH]</code></dt>
<dd><a name="index-gdbserver_002c-search-path-for-libthread_005fdb"></a>
<p>When this command is issued, <var>path</var> is a colon-separated list of
directories to search for <code>libthread_db</code> (see <a href="Threads.html#Threads">set
libthread-db-search-path</a>).  If you omit <var>path</var>,
&lsquo;<samp>libthread-db-search-path</samp>&rsquo; will be reset to its default value.
</p>
<p>The special entry &lsquo;<samp>$pdir</samp>&rsquo; for &lsquo;<samp>libthread-db-search-path</samp>&rsquo; is
not supported in <code>gdbserver</code>.
</p>
</dd>
<dt><code>monitor exit</code></dt>
<dd><p>Tell gdbserver to exit immediately.  This command should be followed by
<code>disconnect</code> to close the debugging session.  <code>gdbserver</code> will
detach from any attached processes and kill any processes it created.
Use <code>monitor exit</code> to terminate <code>gdbserver</code> at the end
of a multi-process mode debug session.
</p>
</dd>
</dl>

<a name="Tracepoints-support-in-gdbserver"></a>
<h4 class="subsection">20.3.4 Tracepoints support in <code>gdbserver</code></h4>
<a name="index-tracepoints-support-in-gdbserver"></a>

<p>On some targets, <code>gdbserver</code> supports tracepoints, fast
tracepoints and static tracepoints.
</p>
<p>For fast or static tracepoints to work, a special library called the
<em>in-process agent</em> (IPA), must be loaded in the inferior process.
This library is built and distributed as an integral part of
<code>gdbserver</code>.  In addition, support for static tracepoints
requires building the in-process agent library with static tracepoints
support.  At present, the UST (LTTng Userspace Tracer,
<a href="http://lttng.org/ust">http://lttng.org/ust</a>) tracing engine is supported.  This support
is automatically available if UST development headers are found in the
standard include path when <code>gdbserver</code> is built, or if
<code>gdbserver</code> was explicitly configured using <samp>--with-ust</samp>
to point at such headers.  You can explicitly disable the support
using <samp>--with-ust=no</samp>.
</p>
<p>There are several ways to load the in-process agent in your program:
</p>
<dl compact="compact">
<dt><code>Specifying it as dependency at link time</code></dt>
<dd>
<p>You can link your program dynamically with the in-process agent
library.  On most systems, this is accomplished by adding
<code>-linproctrace</code> to the link command.
</p>
</dd>
<dt><code>Using the system's preloading mechanisms</code></dt>
<dd>
<p>You can force loading the in-process agent at startup time by using
your system&rsquo;s support for preloading shared libraries.  Many Unixes
support the concept of preloading user defined libraries.  In most
cases, you do that by specifying <code>LD_PRELOAD=libinproctrace.so</code>
in the environment.  See also the description of <code>gdbserver</code>&rsquo;s
<samp>--wrapper</samp> command line option.
</p>
</dd>
<dt><code>Using <small>GDB</small> to force loading the agent at run time</code></dt>
<dd>
<p>On some systems, you can force the inferior to load a shared library,
by calling a dynamic loader function in the inferior that takes care
of dynamically looking up and loading a shared library.  On most Unix
systems, the function is <code>dlopen</code>.  You&rsquo;ll use the <code>call</code>
command for that.  For example:
</p>
<div class="smallexample">
<pre class="smallexample">(gdb) call dlopen (&quot;libinproctrace.so&quot;, ...)
</pre></div>

<p>Note that on most Unix systems, for the <code>dlopen</code> function to be
available, the program needs to be linked with <code>-ldl</code>.
</p></dd>
</dl>

<p>On systems that have a userspace dynamic loader, like most Unix
systems, when you connect to <code>gdbserver</code> using <code>target
remote</code>, you&rsquo;ll find that the program is stopped at the dynamic
loader&rsquo;s entry point, and no shared library has been loaded in the
program&rsquo;s address space yet, including the in-process agent.  In that
case, before being able to use any of the fast or static tracepoints
features, you need to let the loader run and load the shared
libraries.  The simplest way to do that is to run the program to the
main procedure.  E.g., if debugging a C or C<tt>++</tt> program, start
<code>gdbserver</code> like so:
</p>
<div class="smallexample">
<pre class="smallexample">$ gdbserver :9999 myprogram
</pre></div>

<p>Start GDB and connect to <code>gdbserver</code> like so, and run to main:
</p>
<div class="smallexample">
<pre class="smallexample">$ gdb myprogram
(gdb) target remote myhost:9999
0x00007f215893ba60 in ?? () from /lib64/ld-linux-x86-64.so.2
(gdb) b main
(gdb) continue
</pre></div>

<p>The in-process tracing agent library should now be loaded into the
process; you can confirm it with the <code>info sharedlibrary</code>
command, which will list <samp>libinproctrace.so</samp> as loaded in the
process.  You are now ready to install fast tracepoints, list static
tracepoint markers, probe static tracepoints markers, and start
tracing.
</p>
<div class="footnote">
<hr>
<h4 class="footnotes-heading">Footnotes</h4>

<h3><a name="FOOT15" href="#DOCF15">(15)</a></h3>
<p>If you choose a port number that
conflicts with another service, <code>gdbserver</code> prints an error message
and exits.</p>
</div>
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