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<title>Hurd Native - Debugging with GDB</title>
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<a name="Hurd-Native"></a>
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Next: <a rel="next" accesskey="n" href="Darwin.html#Darwin">Darwin</a>,
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Previous: <a rel="previous" accesskey="p" href="Cygwin-Native.html#Cygwin-Native">Cygwin Native</a>,
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</div>
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<h4 class="subsection">21.1.5 Commands Specific to <span class="sc">gnu</span> Hurd Systems</h4>
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<p><a name="index-g_t_0040sc_007bgnu_007d-Hurd-debugging-1526"></a>
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This subsection describes <span class="sc">gdb</span> commands specific to the
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<span class="sc">gnu</span> Hurd native debugging.
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<dl>
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<dt><code>set signals</code><dt><code>set sigs</code><dd><a name="index-set-signals_0040r_007b_002c-Hurd-command_007d-1527"></a><a name="index-set-sigs_0040r_007b_002c-Hurd-command_007d-1528"></a>This command toggles the state of inferior signal interception by
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<span class="sc">gdb</span>. Mach exceptions, such as breakpoint traps, are not
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affected by this command. <code>sigs</code> is a shorthand alias for
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<code>signals</code>.
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<br><dt><code>show signals</code><dt><code>show sigs</code><dd><a name="index-show-signals_0040r_007b_002c-Hurd-command_007d-1529"></a><a name="index-show-sigs_0040r_007b_002c-Hurd-command_007d-1530"></a>Show the current state of intercepting inferior's signals.
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<br><dt><code>set signal-thread</code><dt><code>set sigthread</code><dd><a name="index-set-signal_002dthread-1531"></a><a name="index-set-sigthread-1532"></a>This command tells <span class="sc">gdb</span> which thread is the <code>libc</code> signal
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thread. That thread is run when a signal is delivered to a running
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process. <code>set sigthread</code> is the shorthand alias of <code>set
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signal-thread</code>.
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<br><dt><code>show signal-thread</code><dt><code>show sigthread</code><dd><a name="index-show-signal_002dthread-1533"></a><a name="index-show-sigthread-1534"></a>These two commands show which thread will run when the inferior is
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delivered a signal.
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<br><dt><code>set stopped</code><dd><a name="index-set-stopped_0040r_007b_002c-Hurd-command_007d-1535"></a>This commands tells <span class="sc">gdb</span> that the inferior process is stopped,
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as with the <code>SIGSTOP</code> signal. The stopped process can be
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continued by delivering a signal to it.
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<br><dt><code>show stopped</code><dd><a name="index-show-stopped_0040r_007b_002c-Hurd-command_007d-1536"></a>This command shows whether <span class="sc">gdb</span> thinks the debuggee is
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stopped.
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<br><dt><code>set exceptions</code><dd><a name="index-set-exceptions_0040r_007b_002c-Hurd-command_007d-1537"></a>Use this command to turn off trapping of exceptions in the inferior.
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When exception trapping is off, neither breakpoints nor
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single-stepping will work. To restore the default, set exception
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trapping on.
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<br><dt><code>show exceptions</code><dd><a name="index-show-exceptions_0040r_007b_002c-Hurd-command_007d-1538"></a>Show the current state of trapping exceptions in the inferior.
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<br><dt><code>set task pause</code><dd><a name="index-set-task_0040r_007b_002c-Hurd-commands_007d-1539"></a><a name="index-task-attributes-_0028_0040sc_007bgnu_007d-Hurd_0029-1540"></a><a name="index-pause-current-task-_0028_0040sc_007bgnu_007d-Hurd_0029-1541"></a>This command toggles task suspension when <span class="sc">gdb</span> has control.
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Setting it to on takes effect immediately, and the task is suspended
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whenever <span class="sc">gdb</span> gets control. Setting it to off will take
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effect the next time the inferior is continued. If this option is set
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to off, you can use <code>set thread default pause on</code> or <code>set
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thread pause on</code> (see below) to pause individual threads.
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<br><dt><code>show task pause</code><dd><a name="index-show-task_0040r_007b_002c-Hurd-commands_007d-1542"></a>Show the current state of task suspension.
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<br><dt><code>set task detach-suspend-count</code><dd><a name="index-task-suspend-count-1543"></a><a name="index-detach-from-task_002c-_0040sc_007bgnu_007d-Hurd-1544"></a>This command sets the suspend count the task will be left with when
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<span class="sc">gdb</span> detaches from it.
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<br><dt><code>show task detach-suspend-count</code><dd>Show the suspend count the task will be left with when detaching.
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<br><dt><code>set task exception-port</code><dt><code>set task excp</code><dd><a name="index-task-exception-port_002c-_0040sc_007bgnu_007d-Hurd-1545"></a>This command sets the task exception port to which <span class="sc">gdb</span> will
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forward exceptions. The argument should be the value of the <dfn>send
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rights</dfn> of the task. <code>set task excp</code> is a shorthand alias.
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<br><dt><code>set noninvasive</code><dd><a name="index-noninvasive-task-options-1546"></a>This command switches <span class="sc">gdb</span> to a mode that is the least
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invasive as far as interfering with the inferior is concerned. This
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is the same as using <code>set task pause</code>, <code>set exceptions</code>, and
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<code>set signals</code> to values opposite to the defaults.
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<br><dt><code>info send-rights</code><dt><code>info receive-rights</code><dt><code>info port-rights</code><dt><code>info port-sets</code><dt><code>info dead-names</code><dt><code>info ports</code><dt><code>info psets</code><dd><a name="index-send-rights_002c-_0040sc_007bgnu_007d-Hurd-1547"></a><a name="index-receive-rights_002c-_0040sc_007bgnu_007d-Hurd-1548"></a><a name="index-port-rights_002c-_0040sc_007bgnu_007d-Hurd-1549"></a><a name="index-port-sets_002c-_0040sc_007bgnu_007d-Hurd-1550"></a><a name="index-dead-names_002c-_0040sc_007bgnu_007d-Hurd-1551"></a>These commands display information about, respectively, send rights,
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receive rights, port rights, port sets, and dead names of a task.
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There are also shorthand aliases: <code>info ports</code> for <code>info
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port-rights</code> and <code>info psets</code> for <code>info port-sets</code>.
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<br><dt><code>set thread pause</code><dd><a name="index-set-thread_0040r_007b_002c-Hurd-command_007d-1552"></a><a name="index-thread-properties_002c-_0040sc_007bgnu_007d-Hurd-1553"></a><a name="index-pause-current-thread-_0028_0040sc_007bgnu_007d-Hurd_0029-1554"></a>This command toggles current thread suspension when <span class="sc">gdb</span> has
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control. Setting it to on takes effect immediately, and the current
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thread is suspended whenever <span class="sc">gdb</span> gets control. Setting it to
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off will take effect the next time the inferior is continued.
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Normally, this command has no effect, since when <span class="sc">gdb</span> has
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control, the whole task is suspended. However, if you used <code>set
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task pause off</code> (see above), this command comes in handy to suspend
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only the current thread.
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<br><dt><code>show thread pause</code><dd><a name="index-show-thread_0040r_007b_002c-Hurd-command_007d-1555"></a>This command shows the state of current thread suspension.
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<br><dt><code>set thread run</code><dd>This command sets whether the current thread is allowed to run.
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<br><dt><code>show thread run</code><dd>Show whether the current thread is allowed to run.
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<br><dt><code>set thread detach-suspend-count</code><dd><a name="index-thread-suspend-count_002c-_0040sc_007bgnu_007d-Hurd-1556"></a><a name="index-detach-from-thread_002c-_0040sc_007bgnu_007d-Hurd-1557"></a>This command sets the suspend count <span class="sc">gdb</span> will leave on a
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thread when detaching. This number is relative to the suspend count
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found by <span class="sc">gdb</span> when it notices the thread; use <code>set thread
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takeover-suspend-count</code> to force it to an absolute value.
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<br><dt><code>show thread detach-suspend-count</code><dd>Show the suspend count <span class="sc">gdb</span> will leave on the thread when
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detaching.
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<br><dt><code>set thread exception-port</code><dt><code>set thread excp</code><dd>Set the thread exception port to which to forward exceptions. This
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overrides the port set by <code>set task exception-port</code> (see above).
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<code>set thread excp</code> is the shorthand alias.
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<br><dt><code>set thread takeover-suspend-count</code><dd>Normally, <span class="sc">gdb</span>'s thread suspend counts are relative to the
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value <span class="sc">gdb</span> finds when it notices each thread. This command
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changes the suspend counts to be absolute instead.
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<br><dt><code>set thread default</code><dt><code>show thread default</code><dd><a name="index-thread-default-settings_002c-_0040sc_007bgnu_007d-Hurd-1558"></a>Each of the above <code>set thread</code> commands has a <code>set thread
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default</code> counterpart (e.g., <code>set thread default pause</code>, <code>set
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thread default exception-port</code>, etc.). The <code>thread default</code>
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variety of commands sets the default thread properties for all
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threads; you can then change the properties of individual threads with
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the non-default commands.
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</dl>
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