| <html lang="en"> |
| <head> |
| <title>Hurd Native - Debugging with GDB</title> |
| <meta http-equiv="Content-Type" content="text/html"> |
| <meta name="description" content="Debugging with GDB"> |
| <meta name="generator" content="makeinfo 4.13"> |
| <link title="Top" rel="start" href="index.html#Top"> |
| <link rel="up" href="Native.html#Native" title="Native"> |
| <link rel="prev" href="Cygwin-Native.html#Cygwin-Native" title="Cygwin Native"> |
| <link rel="next" href="Darwin.html#Darwin" title="Darwin"> |
| <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> |
| <!-- |
| Copyright (C) 1988-2019 Free Software Foundation, Inc. |
| |
| Permission is granted to copy, distribute and/or modify this document |
| under the terms of the GNU Free Documentation License, Version 1.3 or |
| any later version published by the Free Software Foundation; with the |
| Invariant Sections being ``Free Software'' and ``Free Software Needs |
| Free Documentation'', with the Front-Cover Texts being ``A GNU Manual,'' |
| and with the Back-Cover Texts as in (a) below. |
| |
| (a) The FSF's Back-Cover Text is: ``You are free to copy and modify |
| this GNU Manual. Buying copies from GNU Press supports the FSF in |
| developing GNU and promoting software freedom.'' |
| --> |
| <meta http-equiv="Content-Style-Type" content="text/css"> |
| <style type="text/css"><!-- |
| pre.display { font-family:inherit } |
| pre.format { font-family:inherit } |
| pre.smalldisplay { font-family:inherit; font-size:smaller } |
| pre.smallformat { font-family:inherit; font-size:smaller } |
| pre.smallexample { font-size:smaller } |
| pre.smalllisp { font-size:smaller } |
| span.sc { font-variant:small-caps } |
| span.roman { font-family:serif; font-weight:normal; } |
| span.sansserif { font-family:sans-serif; font-weight:normal; } |
| --></style> |
| </head> |
| <body> |
| <div class="node"> |
| <a name="Hurd-Native"></a> |
| <p> |
| Next: <a rel="next" accesskey="n" href="Darwin.html#Darwin">Darwin</a>, |
| Previous: <a rel="previous" accesskey="p" href="Cygwin-Native.html#Cygwin-Native">Cygwin Native</a>, |
| Up: <a rel="up" accesskey="u" href="Native.html#Native">Native</a> |
| <hr> |
| </div> |
| |
| <h4 class="subsection">21.1.5 Commands Specific to <span class="sc">gnu</span> Hurd Systems</h4> |
| |
| <p><a name="index-g_t_0040sc_007bgnu_007d-Hurd-debugging-1526"></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-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 |
| <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-1529"></a><a name="index-show-sigs_0040r_007b_002c-Hurd-command_007d-1530"></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-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 |
| 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-1533"></a><a name="index-show-sigthread-1534"></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-1535"></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-1536"></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-1537"></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-1538"></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-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. |
| 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-1542"></a>Show the current state of task suspension. |
| |
| <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 |
| <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-1545"></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-1546"></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-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, |
| 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-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 |
| 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-1555"></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-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 |
| 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-1558"></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> |
| |
| </body></html> |
| |
