This subsection describes GDB commands specific to the GNU Hurd native debugging.
This command toggles the state of inferior signal interception by
GDB. Mach exceptions, such as breakpoint traps, are not
affected by this command.
sigs is a shorthand alias for
Show the current state of intercepting inferior’s signals.
This command tells GDB which thread is the
thread. That thread is run when a signal is delivered to a running
set sigthread is the shorthand alias of
These two commands show which thread will run when the inferior is delivered a signal.
This commands tells GDB that the inferior process is stopped,
as with the
SIGSTOP signal. The stopped process can be
continued by delivering a signal to it.
This command shows whether GDB thinks the debuggee is stopped.
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.
Show the current state of trapping exceptions in the inferior.
set task pause
This command toggles task suspension when GDB has control.
Setting it to on takes effect immediately, and the task is suspended
whenever GDB 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
set thread default pause on or
thread pause on (see below) to pause individual threads.
show task pause
Show the current state of task suspension.
set task detach-suspend-count
This command sets the suspend count the task will be left with when GDB detaches from it.
show task detach-suspend-count
Show the suspend count the task will be left with when detaching.
set task exception-port
set task excp
This command sets the task exception port to which GDB will
forward exceptions. The argument should be the value of the send
rights of the task.
set task excp is a shorthand alias.
This command switches GDB to a mode that is the least
invasive as far as interfering with the inferior is concerned. This
is the same as using
set task pause,
set exceptions, and
set signals to values opposite to the defaults.
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:
info ports for
info psets for
set thread pause
This command toggles current thread suspension when GDB has
control. Setting it to on takes effect immediately, and the current
thread is suspended whenever GDB gets control. Setting it to
off will take effect the next time the inferior is continued.
Normally, this command has no effect, since when GDB has
control, the whole task is suspended. However, if you used
task pause off (see above), this command comes in handy to suspend
only the current thread.
show thread pause
This command shows the state of current thread suspension.
set thread run
This command sets whether the current thread is allowed to run.
show thread run
Show whether the current thread is allowed to run.
set thread detach-suspend-count
This command sets the suspend count GDB will leave on a
thread when detaching. This number is relative to the suspend count
found by GDB when it notices the thread; use
takeover-suspend-count to force it to an absolute value.
show thread detach-suspend-count
Show the suspend count GDB will leave on the thread when detaching.
set thread exception-port
set thread excp
Set the thread exception port to which to forward exceptions. This
overrides the port set by
set task exception-port (see above).
set thread excp is the shorthand alias.
set thread takeover-suspend-count
Normally, GDB’s thread suspend counts are relative to the value GDB finds when it notices each thread. This command changes the suspend counts to be absolute instead.
set thread default
show thread default
Each of the above
set thread commands has a
default counterpart (e.g.,
set thread default pause,
thread default exception-port, etc.). The
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.