ActivityManager: Add link/unlinkToDeath

Native services aren't killed when the system service dies, so they
may need to be able to tell when ActivityManager has died.

Test: adb shell stop; adb shell start; verify camera service still
   allows camera use. No regression to camera CTS.
Bug: 74230547

Change-Id: Iaa078b2f9a1d9c7be305b7667e3055a8ce52aa21

1 files changed, 16 insertions, 0 deletions

diff --git a/libs/binder/ActivityManager.cpp b/libs/binder/ActivityManager.cpp
index e1cc5da2e9..9adac26a31 100644
--- a/libs/binder/ActivityManager.cpp
+++ b/libs/binder/ActivityManager.cpp
@@ -80,4 +80,20 @@ void ActivityManager::unregisterUidObserver(const sp<IUidObserver>& observer)
     }
 }
 
+status_t ActivityManager::linkToDeath(const sp<IBinder::DeathRecipient>& recipient) {
+    sp<IActivityManager> service = getService();
+    if (service != NULL) {
+        return IInterface::asBinder(service)->linkToDeath(recipient);
+    }
+    return INVALID_OPERATION;
+}
+
+status_t ActivityManager::unlinkToDeath(const sp<IBinder::DeathRecipient>& recipient) {
+    sp<IActivityManager> service = getService();
+    if (service != NULL) {
+        return IInterface::asBinder(service)->unlinkToDeath(recipient);
+    }
+    return INVALID_OPERATION;
+}
+
 }; // namespace android