27.5.3 gdb/mi Async Records
Async records are used to notify the gdb/mi client of
additional changes that have occurred. Those changes can either be a
consequence of gdb/mi commands (e.g., a breakpoint modified) or a result of
target activity (e.g., target stopped).
The following is the list of possible async records:
*running,thread-id="thread"- The target is now running. The thread field tells which
specific thread is now running, and can be `all' if all threads
are running. The frontend should assume that no interaction with a
running thread is possible after this notification is produced.
The frontend should not assume that this notification is output
only once for any command. gdb may emit this notification
several times, either for different threads, because it cannot resume
all threads together, or even for a single thread, if the thread must
be stepped though some code before letting it run freely.
*stopped,reason="reason",thread-id="id",stopped-threads="stopped",core="core"- The target has stopped. The reason field can have one of the
following values:
breakpoint-hit- A breakpoint was reached.
watchpoint-trigger- A watchpoint was triggered.
read-watchpoint-trigger- A read watchpoint was triggered.
access-watchpoint-trigger- An access watchpoint was triggered.
function-finished- An -exec-finish or similar CLI command was accomplished.
location-reached- An -exec-until or similar CLI command was accomplished.
watchpoint-scope- A watchpoint has gone out of scope.
end-stepping-range- An -exec-next, -exec-next-instruction, -exec-step, -exec-step-instruction or
similar CLI command was accomplished.
exited-signalled- The inferior exited because of a signal.
exited- The inferior exited.
exited-normally- The inferior exited normally.
signal-received- A signal was received by the inferior.
solib-event- The inferior has stopped due to a library being loaded or unloaded.
This can happen when
stop-on-solib-events (see Files) is
set or when a catch load or catch unload catchpoint is
in use (see Set Catchpoints).
fork- The inferior has forked. This is reported when
catch fork
(see Set Catchpoints) has been used.
vfork- The inferior has vforked. This is reported in when
catch vfork
(see Set Catchpoints) has been used.
syscall-entry- The inferior entered a system call. This is reported when
catch
syscall (see Set Catchpoints) has been used.
syscall-entry- The inferior returned from a system call. This is reported when
catch syscall (see Set Catchpoints) has been used.
exec- The inferior called
exec. This is reported when catch exec
(see Set Catchpoints) has been used.
The id field identifies the thread that directly caused the stop
– for example by hitting a breakpoint. Depending on whether all-stop
mode is in effect (see All-Stop Mode), gdb may either
stop all threads, or only the thread that directly triggered the stop.
If all threads are stopped, the stopped field will have the
value of "all". Otherwise, the value of the stopped
field will be a list of thread identifiers. Presently, this list will
always include a single thread, but frontend should be prepared to see
several threads in the list. The core field reports the
processor core on which the stop event has happened. This field may be absent
if such information is not available.
=thread-group-added,id="id"=thread-group-removed,id="id"- A thread group was either added or removed. The id field
contains the gdb identifier of the thread group. When a thread
group is added, it generally might not be associated with a running
process. When a thread group is removed, its id becomes invalid and
cannot be used in any way.
=thread-group-started,id="id",pid="pid"- A thread group became associated with a running program,
either because the program was just started or the thread group
was attached to a program. The id field contains the
gdb identifier of the thread group. The pid field
contains process identifier, specific to the operating system.
=thread-group-exited,id="id"[,exit-code="code"]- A thread group is no longer associated with a running program,
either because the program has exited, or because it was detached
from. The id field contains the gdb identifier of the
thread group. code is the exit code of the inferior; it exists
only when the inferior exited with some code.
=thread-created,id="id",group-id="gid"=thread-exited,id="id",group-id="gid"- A thread either was created, or has exited. The id field
contains the gdb identifier of the thread. The gid
field identifies the thread group this thread belongs to.
=thread-selected,id="id"- Informs that the selected thread was changed as result of the last
command. This notification is not emitted as result of
-thread-select
command but is emitted whenever an MI command that is not documented
to change the selected thread actually changes it. In particular,
invoking, directly or indirectly (via user-defined command), the CLI
thread command, will generate this notification.
We suggest that in response to this notification, front ends
highlight the selected thread and cause subsequent commands to apply to
that thread.
=library-loaded,...- Reports that a new library file was loaded by the program. This
notification has 4 fields—id, target-name,
host-name, and symbols-loaded. The id field is an
opaque identifier of the library. For remote debugging case,
target-name and host-name fields give the name of the
library file on the target, and on the host respectively. For native
debugging, both those fields have the same value. The
symbols-loaded field is emitted only for backward compatibility
and should not be relied on to convey any useful information. The
thread-group field, if present, specifies the id of the thread
group in whose context the library was loaded. If the field is
absent, it means the library was loaded in the context of all present
thread groups.
=library-unloaded,...- Reports that a library was unloaded by the program. This notification
has 3 fields—id, target-name and host-name with
the same meaning as for the
=library-loaded notification.
The thread-group field, if present, specifies the id of the
thread group in whose context the library was unloaded. If the field is
absent, it means the library was unloaded in the context of all present
thread groups.
=breakpoint-created,bkpt={...}=breakpoint-modified,bkpt={...}=breakpoint-deleted,bkpt={...}- Reports that a breakpoint was created, modified, or deleted,
respectively. Only user-visible breakpoints are reported to the MI
user.
The bkpt argument is of the same form as returned by the various
breakpoint commands; See GDB/MI Breakpoint Commands.
Note that if a breakpoint is emitted in the result record of a
command, then it will not also be emitted in an async record.