commit 86080b8353d4ca0169e107cdc6c34f9a2e70b0ad
author Steven Moreland <smoreland@google.com> Mon Sep 23 15:41:18 2019 -0700
committer Steven Moreland <smoreland@google.com> Tue Sep 24 13:41:12 2019 -0700
tree a8071fb3b8d3f0dcba4a15d7aaab7c1472919105
parent b5f8331e88468625a58fa161935acd083ffa9c85

libbinder: add getDebugPid

So that the PID of a service/binder can easily be looked up (for parity
w/ HIDL).

Bug: 141187318
Test: use w/ dumpsys
Change-Id: I29bf9acfe0cd1029d7aa2bb466b97347d46f2947

libs/binder/Binder.cpp

diff --git a/libs/binder/Binder.cpp b/libs/binder/Binder.cpp
index 693045e..34b6ea5 100644
--- a/libs/binder/Binder.cpp
+++ b/libs/binder/Binder.cpp
@@ -99,6 +99,32 @@
     return reply.readNullableStrongBinder(out);
 }
 
+status_t IBinder::getDebugPid(pid_t* out) {
+    BBinder* local = this->localBinder();
+    if (local != nullptr) {
+      *out = local->getDebugPid();
+      return OK;
+    }
+
+    BpBinder* proxy = this->remoteBinder();
+    LOG_ALWAYS_FATAL_IF(proxy == nullptr);
+
+    Parcel data;
+    Parcel reply;
+    status_t status = transact(DEBUG_PID_TRANSACTION, data, &reply);
+    if (status != OK) return status;
+
+    int32_t pid;
+    status = reply.readInt32(&pid);
+    if (status != OK) return status;
+
+    if (pid < 0 || pid > std::numeric_limits<pid_t>::max()) {
+        return BAD_VALUE;
+    }
+    *out = pid;
+    return OK;
+}
+
 // ---------------------------------------------------------------------------
 
 class BBinder::Extras
@@ -152,6 +178,9 @@
         case EXTENSION_TRANSACTION:
             err = reply->writeStrongBinder(getExtension());
             break;
+        case DEBUG_PID_TRANSACTION:
+            err = reply->writeInt32(getDebugPid());
+            break;
         default:
             err = onTransact(code, data, reply, flags);
             break;
@@ -250,6 +279,10 @@
     return e->mExtension;
 }
 
+pid_t BBinder::getDebugPid() {
+    return getpid();
+}
+
 void BBinder::setExtension(const sp<IBinder>& extension) {
     Extras* e = getOrCreateExtras();
     e->mExtension = extension;