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| <h4 class="subsection">21.1.6 Commands Specific to <span class="sc">gnu</span> Hurd Systems</h4> |
| |
| <p><a name="index-g_t_0040sc_007bgnu_007d-Hurd-debugging-1231"></a> |
| This subsection describes <span class="sc">gdb</span> commands specific to the |
| <span class="sc">gnu</span> Hurd native debugging. |
| |
| <dl> |
| <dt><code>set signals</code><dt><code>set sigs</code><dd><a name="index-set-signals_0040r_007b_002c-Hurd-command_007d-1232"></a><a name="index-set-sigs_0040r_007b_002c-Hurd-command_007d-1233"></a>This command toggles the state of inferior signal interception by |
| <span class="sc">gdb</span>. Mach exceptions, such as breakpoint traps, are not |
| affected by this command. <code>sigs</code> is a shorthand alias for |
| <code>signals</code>. |
| |
| <br><dt><code>show signals</code><dt><code>show sigs</code><dd><a name="index-show-signals_0040r_007b_002c-Hurd-command_007d-1234"></a><a name="index-show-sigs_0040r_007b_002c-Hurd-command_007d-1235"></a>Show the current state of intercepting inferior's signals. |
| |
| <br><dt><code>set signal-thread</code><dt><code>set sigthread</code><dd><a name="index-set-signal_002dthread-1236"></a><a name="index-set-sigthread-1237"></a>This command tells <span class="sc">gdb</span> 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>. |
| |
| <br><dt><code>show signal-thread</code><dt><code>show sigthread</code><dd><a name="index-show-signal_002dthread-1238"></a><a name="index-show-sigthread-1239"></a>These two commands show which thread will run when the inferior is |
| delivered a signal. |
| |
| <br><dt><code>set stopped</code><dd><a name="index-set-stopped_0040r_007b_002c-Hurd-command_007d-1240"></a>This commands tells <span class="sc">gdb</span> 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. |
| |
| <br><dt><code>show stopped</code><dd><a name="index-show-stopped_0040r_007b_002c-Hurd-command_007d-1241"></a>This command shows whether <span class="sc">gdb</span> thinks the debuggee is |
| stopped. |
| |
| <br><dt><code>set exceptions</code><dd><a name="index-set-exceptions_0040r_007b_002c-Hurd-command_007d-1242"></a>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. |
| |
| <br><dt><code>show exceptions</code><dd><a name="index-show-exceptions_0040r_007b_002c-Hurd-command_007d-1243"></a>Show the current state of trapping exceptions in the inferior. |
| |
| <br><dt><code>set task pause</code><dd><a name="index-set-task_0040r_007b_002c-Hurd-commands_007d-1244"></a><a name="index-task-attributes-_0028_0040sc_007bgnu_007d-Hurd_0029-1245"></a><a name="index-pause-current-task-_0028_0040sc_007bgnu_007d-Hurd_0029-1246"></a>This command toggles task suspension when <span class="sc">gdb</span> has control. |
| Setting it to on takes effect immediately, and the task is suspended |
| whenever <span class="sc">gdb</span> 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. |
| |
| <br><dt><code>show task pause</code><dd><a name="index-show-task_0040r_007b_002c-Hurd-commands_007d-1247"></a>Show the current state of task suspension. |
| |
| <br><dt><code>set task detach-suspend-count</code><dd><a name="index-task-suspend-count-1248"></a><a name="index-detach-from-task_002c-_0040sc_007bgnu_007d-Hurd-1249"></a>This command sets the suspend count the task will be left with when |
| <span class="sc">gdb</span> detaches from it. |
| |
| <br><dt><code>show task detach-suspend-count</code><dd>Show the suspend count the task will be left with when detaching. |
| |
| <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-1250"></a>This command sets the task exception port to which <span class="sc">gdb</span> will |
| forward exceptions. The argument should be the value of the <dfn>send |
| rights</dfn> of the task. <code>set task excp</code> is a shorthand alias. |
| |
| <br><dt><code>set noninvasive</code><dd><a name="index-noninvasive-task-options-1251"></a>This command switches <span class="sc">gdb</span> 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. |
| |
| <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-1252"></a><a name="index-receive-rights_002c-_0040sc_007bgnu_007d-Hurd-1253"></a><a name="index-port-rights_002c-_0040sc_007bgnu_007d-Hurd-1254"></a><a name="index-port-sets_002c-_0040sc_007bgnu_007d-Hurd-1255"></a><a name="index-dead-names_002c-_0040sc_007bgnu_007d-Hurd-1256"></a>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>. |
| |
| <br><dt><code>set thread pause</code><dd><a name="index-set-thread_0040r_007b_002c-Hurd-command_007d-1257"></a><a name="index-thread-properties_002c-_0040sc_007bgnu_007d-Hurd-1258"></a><a name="index-pause-current-thread-_0028_0040sc_007bgnu_007d-Hurd_0029-1259"></a>This command toggles current thread suspension when <span class="sc">gdb</span> has |
| control. Setting it to on takes effect immediately, and the current |
| thread is suspended whenever <span class="sc">gdb</span> gets control. Setting it to |
| off will take effect the next time the inferior is continued. |
| Normally, this command has no effect, since when <span class="sc">gdb</span> 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. |
| |
| <br><dt><code>show thread pause</code><dd><a name="index-show-thread_0040r_007b_002c-Hurd-command_007d-1260"></a>This command shows the state of current thread suspension. |
| |
| <br><dt><code>set thread run</code><dd>This command sets whether the current thread is allowed to run. |
| |
| <br><dt><code>show thread run</code><dd>Show whether the current thread is allowed to run. |
| |
| <br><dt><code>set thread detach-suspend-count</code><dd><a name="index-thread-suspend-count_002c-_0040sc_007bgnu_007d-Hurd-1261"></a><a name="index-detach-from-thread_002c-_0040sc_007bgnu_007d-Hurd-1262"></a>This command sets the suspend count <span class="sc">gdb</span> will leave on a |
| thread when detaching. This number is relative to the suspend count |
| found by <span class="sc">gdb</span> when it notices the thread; use <code>set thread |
| takeover-suspend-count</code> to force it to an absolute value. |
| |
| <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 |
| detaching. |
| |
| <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 |
| overrides the port set by <code>set task exception-port</code> (see above). |
| <code>set thread excp</code> is the shorthand alias. |
| |
| <br><dt><code>set thread takeover-suspend-count</code><dd>Normally, <span class="sc">gdb</span>'s thread suspend counts are relative to the |
| value <span class="sc">gdb</span> finds when it notices each thread. This command |
| changes the suspend counts to be absolute instead. |
| |
| <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-1263"></a>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. |
| </dl> |
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