[binutils-gdb] gdb: add inferior_pre_detach observable

[Simon Marchi <simark@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=9056c917b3e7a7d41c586087bdb8779197254d1e

commit 9056c917b3e7a7d41c586087bdb8779197254d1e
Author: Simon Marchi <simon.marchi@efficios.com>
Date:   Wed Sep 28 14:35:26 2022 -0400

    gdb: add inferior_pre_detach observable
    
    Add an observable notified in target_detach just before calling the
    detach method on the inferior's target stack.  This allows observer to
    do some work on the inferior while it's still ptrace-attached, in the
    case of a native Linux inferior.  Specifically, the amd-dbgapi target
    will need it in order to call amd_dbgapi_process_detach before the
    process gets ptrace-detached.
    
    Change-Id: I28b6065e251012a4c2db8a600fe13ba31671e3c9
    Approved-By: Andrew Burgess <aburgess@redhat.com>

Diff:
---
 gdb/observable.c | 1 +
 gdb/observable.h | 3 +++
 gdb/target.c     | 2 ++
 3 files changed, 6 insertions(+)

diff --git a/gdb/observable.c b/gdb/observable.c
index 5906e58628e..28249a5ad01 100644
--- a/gdb/observable.c
+++ b/gdb/observable.c
@@ -62,6 +62,7 @@ DEFINE_OBSERVABLE (architecture_changed);
 DEFINE_OBSERVABLE (thread_ptid_changed);
 DEFINE_OBSERVABLE (inferior_added);
 DEFINE_OBSERVABLE (inferior_appeared);
+DEFINE_OBSERVABLE (inferior_pre_detach);
 DEFINE_OBSERVABLE (inferior_exit);
 DEFINE_OBSERVABLE (inferior_removed);
 DEFINE_OBSERVABLE (memory_changed);
diff --git a/gdb/observable.h b/gdb/observable.h
index aed326e4338..efd0446e168 100644
--- a/gdb/observable.h
+++ b/gdb/observable.h
@@ -181,6 +181,9 @@ extern observable<struct inferior */* inf */> inferior_added;
    process.  */
 extern observable<struct inferior */* inf */> inferior_appeared;
 
+/* Inferior INF is about to be detached.  */
+extern observable<struct inferior */* inf */> inferior_pre_detach;
+
 /* Either the inferior associated with INF has been detached from
    the process, or the process has exited.  */
 extern observable<struct inferior */* inf */> inferior_exit;
diff --git a/gdb/target.c b/gdb/target.c
index d5bfd7d0849..d0aa8f5cc6c 100644
--- a/gdb/target.c
+++ b/gdb/target.c
@@ -2528,6 +2528,8 @@ target_detach (inferior *inf, int from_tty)
 
   prepare_for_detach ();
 
+  gdb::observers::inferior_pre_detach.notify (inf);
+
   /* Hold a strong reference because detaching may unpush the
      target.  */
   auto proc_target_ref = target_ops_ref::new_reference (inf->process_target ());