228 lines
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228 lines
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<title>GDB/MI Async Records - Debugging with GDB</title>
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<link rel="up" href="GDB_002fMI-Output-Records.html#GDB_002fMI-Output-Records" title="GDB/MI Output Records">
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<link rel="prev" href="GDB_002fMI-Stream-Records.html#GDB_002fMI-Stream-Records" title="GDB/MI Stream Records">
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<link rel="next" href="GDB_002fMI-Breakpoint-Information.html#GDB_002fMI-Breakpoint-Information" title="GDB/MI Breakpoint Information">
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Copyright (C) 1988-2019 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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<div class="node">
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<a name="GDB%2fMI-Async-Records"></a>
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<a name="GDB_002fMI-Async-Records"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="GDB_002fMI-Breakpoint-Information.html#GDB_002fMI-Breakpoint-Information">GDB/MI Breakpoint Information</a>,
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Previous: <a rel="previous" accesskey="p" href="GDB_002fMI-Stream-Records.html#GDB_002fMI-Stream-Records">GDB/MI Stream Records</a>,
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Up: <a rel="up" accesskey="u" href="GDB_002fMI-Output-Records.html#GDB_002fMI-Output-Records">GDB/MI Output Records</a>
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<hr>
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</div>
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<h4 class="subsection">27.5.3 <span class="sc">gdb/mi</span> Async Records</h4>
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<p><a name="index-async-records-in-_0040sc_007bgdb_002fmi_007d-2977"></a><a name="index-g_t_0040sc_007bgdb_002fmi_007d_002c-async-records-2978"></a><dfn>Async</dfn> records are used to notify the <span class="sc">gdb/mi</span> client of
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additional changes that have occurred. Those changes can either be a
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consequence of <span class="sc">gdb/mi</span> commands (e.g., a breakpoint modified) or a result of
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target activity (e.g., target stopped).
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<p>The following is the list of possible async records:
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<dl>
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<dt><code>*running,thread-id="</code><var>thread</var><code>"</code><dd>The target is now running. The <var>thread</var> field can be the global
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thread ID of the the thread that is now running, and it can be
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‘<samp><span class="samp">all</span></samp>’ if all threads are running. The frontend should assume
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that no interaction with a running thread is possible after this
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notification is produced. The frontend should not assume that this
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notification is output only once for any command. <span class="sc">gdb</span> may
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emit this notification several times, either for different threads,
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because it cannot resume all threads together, or even for a single
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thread, if the thread must be stepped though some code before letting
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it run freely.
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<br><dt><code>*stopped,reason="</code><var>reason</var><code>",thread-id="</code><var>id</var><code>",stopped-threads="</code><var>stopped</var><code>",core="</code><var>core</var><code>"</code><dd>The target has stopped. The <var>reason</var> field can have one of the
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following values:
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<dl>
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<dt><code>breakpoint-hit</code><dd>A breakpoint was reached.
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<br><dt><code>watchpoint-trigger</code><dd>A watchpoint was triggered.
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<br><dt><code>read-watchpoint-trigger</code><dd>A read watchpoint was triggered.
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<br><dt><code>access-watchpoint-trigger</code><dd>An access watchpoint was triggered.
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<br><dt><code>function-finished</code><dd>An -exec-finish or similar CLI command was accomplished.
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<br><dt><code>location-reached</code><dd>An -exec-until or similar CLI command was accomplished.
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<br><dt><code>watchpoint-scope</code><dd>A watchpoint has gone out of scope.
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<br><dt><code>end-stepping-range</code><dd>An -exec-next, -exec-next-instruction, -exec-step, -exec-step-instruction or
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similar CLI command was accomplished.
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<br><dt><code>exited-signalled</code><dd>The inferior exited because of a signal.
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<br><dt><code>exited</code><dd>The inferior exited.
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<br><dt><code>exited-normally</code><dd>The inferior exited normally.
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<br><dt><code>signal-received</code><dd>A signal was received by the inferior.
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<br><dt><code>solib-event</code><dd>The inferior has stopped due to a library being loaded or unloaded.
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This can happen when <code>stop-on-solib-events</code> (see <a href="Files.html#Files">Files</a>) is
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set or when a <code>catch load</code> or <code>catch unload</code> catchpoint is
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in use (see <a href="Set-Catchpoints.html#Set-Catchpoints">Set Catchpoints</a>).
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<br><dt><code>fork</code><dd>The inferior has forked. This is reported when <code>catch fork</code>
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(see <a href="Set-Catchpoints.html#Set-Catchpoints">Set Catchpoints</a>) has been used.
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<br><dt><code>vfork</code><dd>The inferior has vforked. This is reported in when <code>catch vfork</code>
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(see <a href="Set-Catchpoints.html#Set-Catchpoints">Set Catchpoints</a>) has been used.
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<br><dt><code>syscall-entry</code><dd>The inferior entered a system call. This is reported when <code>catch
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syscall</code> (see <a href="Set-Catchpoints.html#Set-Catchpoints">Set Catchpoints</a>) has been used.
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<br><dt><code>syscall-return</code><dd>The inferior returned from a system call. This is reported when
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<code>catch syscall</code> (see <a href="Set-Catchpoints.html#Set-Catchpoints">Set Catchpoints</a>) has been used.
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<br><dt><code>exec</code><dd>The inferior called <code>exec</code>. This is reported when <code>catch exec</code>
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(see <a href="Set-Catchpoints.html#Set-Catchpoints">Set Catchpoints</a>) has been used.
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</dl>
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<p>The <var>id</var> field identifies the global thread ID of the thread
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that directly caused the stop – for example by hitting a breakpoint.
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Depending on whether all-stop
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mode is in effect (see <a href="All_002dStop-Mode.html#All_002dStop-Mode">All-Stop Mode</a>), <span class="sc">gdb</span> may either
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stop all threads, or only the thread that directly triggered the stop.
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If all threads are stopped, the <var>stopped</var> field will have the
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value of <code>"all"</code>. Otherwise, the value of the <var>stopped</var>
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field will be a list of thread identifiers. Presently, this list will
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always include a single thread, but frontend should be prepared to see
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several threads in the list. The <var>core</var> field reports the
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processor core on which the stop event has happened. This field may be absent
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if such information is not available.
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<br><dt><code>=thread-group-added,id="</code><var>id</var><code>"</code><dt><code>=thread-group-removed,id="</code><var>id</var><code>"</code><dd>A thread group was either added or removed. The <var>id</var> field
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contains the <span class="sc">gdb</span> identifier of the thread group. When a thread
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group is added, it generally might not be associated with a running
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process. When a thread group is removed, its id becomes invalid and
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cannot be used in any way.
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<br><dt><code>=thread-group-started,id="</code><var>id</var><code>",pid="</code><var>pid</var><code>"</code><dd>A thread group became associated with a running program,
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either because the program was just started or the thread group
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was attached to a program. The <var>id</var> field contains the
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<span class="sc">gdb</span> identifier of the thread group. The <var>pid</var> field
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contains process identifier, specific to the operating system.
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<br><dt><code>=thread-group-exited,id="</code><var>id</var><code>"[,exit-code="</code><var>code</var><code>"]</code><dd>A thread group is no longer associated with a running program,
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either because the program has exited, or because it was detached
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from. The <var>id</var> field contains the <span class="sc">gdb</span> identifier of the
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thread group. The <var>code</var> field is the exit code of the inferior; it exists
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only when the inferior exited with some code.
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<br><dt><code>=thread-created,id="</code><var>id</var><code>",group-id="</code><var>gid</var><code>"</code><dt><code>=thread-exited,id="</code><var>id</var><code>",group-id="</code><var>gid</var><code>"</code><dd>A thread either was created, or has exited. The <var>id</var> field
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contains the global <span class="sc">gdb</span> identifier of the thread. The <var>gid</var>
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field identifies the thread group this thread belongs to.
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<br><dt><code>=thread-selected,id="</code><var>id</var><code>"[,frame="</code><var>frame</var><code>"]</code><dd>Informs that the selected thread or frame were changed. This notification
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is not emitted as result of the <code>-thread-select</code> or
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<code>-stack-select-frame</code> commands, but is emitted whenever an MI command
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that is not documented to change the selected thread and frame actually
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changes them. In particular, invoking, directly or indirectly
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(via user-defined command), the CLI <code>thread</code> or <code>frame</code> commands,
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will generate this notification. Changing the thread or frame from another
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user interface (see <a href="Interpreters.html#Interpreters">Interpreters</a>) will also generate this notification.
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<p>The <var>frame</var> field is only present if the newly selected thread is
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stopped. See <a href="GDB_002fMI-Frame-Information.html#GDB_002fMI-Frame-Information">GDB/MI Frame Information</a> for the format of its value.
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<p>We suggest that in response to this notification, front ends
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highlight the selected thread and cause subsequent commands to apply to
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that thread.
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<br><dt><code>=library-loaded,...</code><dd>Reports that a new library file was loaded by the program. This
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notification has 5 fields—<var>id</var>, <var>target-name</var>,
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<var>host-name</var>, <var>symbols-loaded</var> and <var>ranges</var>. The <var>id</var> field is an
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opaque identifier of the library. For remote debugging case,
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<var>target-name</var> and <var>host-name</var> fields give the name of the
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library file on the target, and on the host respectively. For native
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debugging, both those fields have the same value. The
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<var>symbols-loaded</var> field is emitted only for backward compatibility
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and should not be relied on to convey any useful information. The
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<var>thread-group</var> field, if present, specifies the id of the thread
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group in whose context the library was loaded. If the field is
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absent, it means the library was loaded in the context of all present
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thread groups. The <var>ranges</var> field specifies the ranges of addresses belonging
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to this library.
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<br><dt><code>=library-unloaded,...</code><dd>Reports that a library was unloaded by the program. This notification
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has 3 fields—<var>id</var>, <var>target-name</var> and <var>host-name</var> with
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the same meaning as for the <code>=library-loaded</code> notification.
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The <var>thread-group</var> field, if present, specifies the id of the
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thread group in whose context the library was unloaded. If the field is
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absent, it means the library was unloaded in the context of all present
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thread groups.
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<br><dt><code>=traceframe-changed,num=</code><var>tfnum</var><code>,tracepoint=</code><var>tpnum</var><dt><code>=traceframe-changed,end</code><dd>Reports that the trace frame was changed and its new number is
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<var>tfnum</var>. The number of the tracepoint associated with this trace
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frame is <var>tpnum</var>.
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<br><dt><code>=tsv-created,name=</code><var>name</var><code>,initial=</code><var>initial</var><dd>Reports that the new trace state variable <var>name</var> is created with
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initial value <var>initial</var>.
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<br><dt><code>=tsv-deleted,name=</code><var>name</var><dt><code>=tsv-deleted</code><dd>Reports that the trace state variable <var>name</var> is deleted or all
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trace state variables are deleted.
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<br><dt><code>=tsv-modified,name=</code><var>name</var><code>,initial=</code><var>initial</var><code>[,current=</code><var>current</var><code>]</code><dd>Reports that the trace state variable <var>name</var> is modified with
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the initial value <var>initial</var>. The current value <var>current</var> of
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trace state variable is optional and is reported if the current
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value of trace state variable is known.
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<br><dt><code>=breakpoint-created,bkpt={...}</code><dt><code>=breakpoint-modified,bkpt={...}</code><dt><code>=breakpoint-deleted,id=</code><var>number</var><dd>Reports that a breakpoint was created, modified, or deleted,
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respectively. Only user-visible breakpoints are reported to the MI
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user.
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<p>The <var>bkpt</var> argument is of the same form as returned by the various
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breakpoint commands; See <a href="GDB_002fMI-Breakpoint-Commands.html#GDB_002fMI-Breakpoint-Commands">GDB/MI Breakpoint Commands</a>. The
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<var>number</var> is the ordinal number of the breakpoint.
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<p>Note that if a breakpoint is emitted in the result record of a
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command, then it will not also be emitted in an async record.
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<br><dt><code>=record-started,thread-group="</code><var>id</var><code>",method="</code><var>method</var><code>"[,format="</code><var>format</var><code>"]</code><dt><code>=record-stopped,thread-group="</code><var>id</var><code>"</code><dd>Execution log recording was either started or stopped on an
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inferior. The <var>id</var> is the <span class="sc">gdb</span> identifier of the thread
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group corresponding to the affected inferior.
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<p>The <var>method</var> field indicates the method used to record execution. If the
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method in use supports multiple recording formats, <var>format</var> will be present
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and contain the currently used format. See <a href="Process-Record-and-Replay.html#Process-Record-and-Replay">Process Record and Replay</a>,
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for existing method and format values.
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<br><dt><code>=cmd-param-changed,param=</code><var>param</var><code>,value=</code><var>value</var><dd>Reports that a parameter of the command <code>set </code><var>param</var> is
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changed to <var>value</var>. In the multi-word <code>set</code> command,
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the <var>param</var> is the whole parameter list to <code>set</code> command.
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For example, In command <code>set check type on</code>, <var>param</var>
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is <code>check type</code> and <var>value</var> is <code>on</code>.
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<br><dt><code>=memory-changed,thread-group=</code><var>id</var><code>,addr=</code><var>addr</var><code>,len=</code><var>len</var><code>[,type="code"]</code><dd>Reports that bytes from <var>addr</var> to <var>data</var> + <var>len</var> were
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written in an inferior. The <var>id</var> is the identifier of the
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thread group corresponding to the affected inferior. The optional
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<code>type="code"</code> part is reported if the memory written to holds
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executable code.
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</dl>
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</body></html>
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