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| <a name="Commands-Specific-to-GNU-Hurd-Systems"></a> |
| <h4 class="subsection">21.1.6 Commands Specific to <small>GNU</small> Hurd Systems</h4> |
| <a name="index-GNU-Hurd-debugging"></a> |
| |
| <p>This subsection describes <small>GDB</small> commands specific to the |
| <small>GNU</small> Hurd native debugging. |
| </p> |
| <dl compact="compact"> |
| <dt><code>set signals</code></dt> |
| <dt><code>set sigs</code></dt> |
| <dd><a name="index-set-signals_002c-Hurd-command"></a> |
| <a name="index-set-sigs_002c-Hurd-command"></a> |
| <p>This command toggles the state of inferior signal interception by |
| <small>GDB</small>. Mach exceptions, such as breakpoint traps, are not |
| affected by this command. <code>sigs</code> is a shorthand alias for |
| <code>signals</code>. |
| </p> |
| </dd> |
| <dt><code>show signals</code></dt> |
| <dt><code>show sigs</code></dt> |
| <dd><a name="index-show-signals_002c-Hurd-command"></a> |
| <a name="index-show-sigs_002c-Hurd-command"></a> |
| <p>Show the current state of intercepting inferior’s signals. |
| </p> |
| </dd> |
| <dt><code>set signal-thread</code></dt> |
| <dt><code>set sigthread</code></dt> |
| <dd><a name="index-set-signal_002dthread"></a> |
| <a name="index-set-sigthread"></a> |
| <p>This command tells <small>GDB</small> which thread is the <code>libc</code> signal |
| thread. That thread is run when a signal is delivered to a running |
| process. <code>set sigthread</code> is the shorthand alias of <code>set |
| signal-thread</code>. |
| </p> |
| </dd> |
| <dt><code>show signal-thread</code></dt> |
| <dt><code>show sigthread</code></dt> |
| <dd><a name="index-show-signal_002dthread"></a> |
| <a name="index-show-sigthread"></a> |
| <p>These two commands show which thread will run when the inferior is |
| delivered a signal. |
| </p> |
| </dd> |
| <dt><code>set stopped</code></dt> |
| <dd><a name="index-set-stopped_002c-Hurd-command"></a> |
| <p>This commands tells <small>GDB</small> that the inferior process is stopped, |
| as with the <code>SIGSTOP</code> signal. The stopped process can be |
| continued by delivering a signal to it. |
| </p> |
| </dd> |
| <dt><code>show stopped</code></dt> |
| <dd><a name="index-show-stopped_002c-Hurd-command"></a> |
| <p>This command shows whether <small>GDB</small> thinks the debuggee is |
| stopped. |
| </p> |
| </dd> |
| <dt><code>set exceptions</code></dt> |
| <dd><a name="index-set-exceptions_002c-Hurd-command"></a> |
| <p>Use this command to turn off trapping of exceptions in the inferior. |
| When exception trapping is off, neither breakpoints nor |
| single-stepping will work. To restore the default, set exception |
| trapping on. |
| </p> |
| </dd> |
| <dt><code>show exceptions</code></dt> |
| <dd><a name="index-show-exceptions_002c-Hurd-command"></a> |
| <p>Show the current state of trapping exceptions in the inferior. |
| </p> |
| </dd> |
| <dt><code>set task pause</code></dt> |
| <dd><a name="index-set-task_002c-Hurd-commands"></a> |
| <a name="index-task-attributes-_0028GNU-Hurd_0029"></a> |
| <a name="index-pause-current-task-_0028GNU-Hurd_0029"></a> |
| <p>This command toggles task suspension when <small>GDB</small> has control. |
| Setting it to on takes effect immediately, and the task is suspended |
| whenever <small>GDB</small> gets control. Setting it to off will take |
| effect the next time the inferior is continued. If this option is set |
| to off, you can use <code>set thread default pause on</code> or <code>set |
| thread pause on</code> (see below) to pause individual threads. |
| </p> |
| </dd> |
| <dt><code>show task pause</code></dt> |
| <dd><a name="index-show-task_002c-Hurd-commands"></a> |
| <p>Show the current state of task suspension. |
| </p> |
| </dd> |
| <dt><code>set task detach-suspend-count</code></dt> |
| <dd><a name="index-task-suspend-count"></a> |
| <a name="index-detach-from-task_002c-GNU-Hurd"></a> |
| <p>This command sets the suspend count the task will be left with when |
| <small>GDB</small> detaches from it. |
| </p> |
| </dd> |
| <dt><code>show task detach-suspend-count</code></dt> |
| <dd><p>Show the suspend count the task will be left with when detaching. |
| </p> |
| </dd> |
| <dt><code>set task exception-port</code></dt> |
| <dt><code>set task excp</code></dt> |
| <dd><a name="index-task-exception-port_002c-GNU-Hurd"></a> |
| <p>This command sets the task exception port to which <small>GDB</small> will |
| forward exceptions. The argument should be the value of the <em>send |
| rights</em> of the task. <code>set task excp</code> is a shorthand alias. |
| </p> |
| </dd> |
| <dt><code>set noninvasive</code></dt> |
| <dd><a name="index-noninvasive-task-options"></a> |
| <p>This command switches <small>GDB</small> to a mode that is the least |
| invasive as far as interfering with the inferior is concerned. This |
| is the same as using <code>set task pause</code>, <code>set exceptions</code>, and |
| <code>set signals</code> to values opposite to the defaults. |
| </p> |
| </dd> |
| <dt><code>info send-rights</code></dt> |
| <dt><code>info receive-rights</code></dt> |
| <dt><code>info port-rights</code></dt> |
| <dt><code>info port-sets</code></dt> |
| <dt><code>info dead-names</code></dt> |
| <dt><code>info ports</code></dt> |
| <dt><code>info psets</code></dt> |
| <dd><a name="index-send-rights_002c-GNU-Hurd"></a> |
| <a name="index-receive-rights_002c-GNU-Hurd"></a> |
| <a name="index-port-rights_002c-GNU-Hurd"></a> |
| <a name="index-port-sets_002c-GNU-Hurd"></a> |
| <a name="index-dead-names_002c-GNU-Hurd"></a> |
| <p>These commands display information about, respectively, send rights, |
| receive rights, port rights, port sets, and dead names of a task. |
| There are also shorthand aliases: <code>info ports</code> for <code>info |
| port-rights</code> and <code>info psets</code> for <code>info port-sets</code>. |
| </p> |
| </dd> |
| <dt><code>set thread pause</code></dt> |
| <dd><a name="index-set-thread_002c-Hurd-command"></a> |
| <a name="index-thread-properties_002c-GNU-Hurd"></a> |
| <a name="index-pause-current-thread-_0028GNU-Hurd_0029"></a> |
| <p>This command toggles current thread suspension when <small>GDB</small> has |
| control. Setting it to on takes effect immediately, and the current |
| thread is suspended whenever <small>GDB</small> gets control. Setting it to |
| off will take effect the next time the inferior is continued. |
| Normally, this command has no effect, since when <small>GDB</small> has |
| control, the whole task is suspended. However, if you used <code>set |
| task pause off</code> (see above), this command comes in handy to suspend |
| only the current thread. |
| </p> |
| </dd> |
| <dt><code>show thread pause</code></dt> |
| <dd><a name="index-show-thread_002c-Hurd-command"></a> |
| <p>This command shows the state of current thread suspension. |
| </p> |
| </dd> |
| <dt><code>set thread run</code></dt> |
| <dd><p>This command sets whether the current thread is allowed to run. |
| </p> |
| </dd> |
| <dt><code>show thread run</code></dt> |
| <dd><p>Show whether the current thread is allowed to run. |
| </p> |
| </dd> |
| <dt><code>set thread detach-suspend-count</code></dt> |
| <dd><a name="index-thread-suspend-count_002c-GNU-Hurd"></a> |
| <a name="index-detach-from-thread_002c-GNU-Hurd"></a> |
| <p>This command sets the suspend count <small>GDB</small> will leave on a |
| thread when detaching. This number is relative to the suspend count |
| found by <small>GDB</small> when it notices the thread; use <code>set thread |
| takeover-suspend-count</code> to force it to an absolute value. |
| </p> |
| </dd> |
| <dt><code>show thread detach-suspend-count</code></dt> |
| <dd><p>Show the suspend count <small>GDB</small> will leave on the thread when |
| detaching. |
| </p> |
| </dd> |
| <dt><code>set thread exception-port</code></dt> |
| <dt><code>set thread excp</code></dt> |
| <dd><p>Set the thread exception port to which to forward exceptions. This |
| overrides the port set by <code>set task exception-port</code> (see above). |
| <code>set thread excp</code> is the shorthand alias. |
| </p> |
| </dd> |
| <dt><code>set thread takeover-suspend-count</code></dt> |
| <dd><p>Normally, <small>GDB</small>’s thread suspend counts are relative to the |
| value <small>GDB</small> finds when it notices each thread. This command |
| changes the suspend counts to be absolute instead. |
| </p> |
| </dd> |
| <dt><code>set thread default</code></dt> |
| <dt><code>show thread default</code></dt> |
| <dd><a name="index-thread-default-settings_002c-GNU-Hurd"></a> |
| <p>Each of the above <code>set thread</code> commands has a <code>set thread |
| default</code> counterpart (e.g., <code>set thread default pause</code>, <code>set |
| thread default exception-port</code>, etc.). The <code>thread default</code> |
| variety of commands sets the default thread properties for all |
| threads; you can then change the properties of individual threads with |
| the non-default commands. |
| </p></dd> |
| </dl> |
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