commit e12fccc47f691e19041e6d1d94d0f70c7731c0e1
author Inseob Kim <inseob@google.com> Thu Sep 02 17:23:33 2021 +0900
committer Inseob Kim <inseob@google.com> Wed Sep 08 10:45:22 2021 +0900
tree 019ec19bfc9c865d22f1228466945b32ac285faf
parent 01befc8f41d98a660f66ca00565f56db9f69137d

Add support for preconnected RPC client

Normally we want to call RpcClient directly, but the apps don't have
access to create a client vsock themselves. This change adds a helper
function to establish an RPC session with preconnected file descriptor.

Bug: 195381416
Test: atest MicrodroidHostTestCases
Change-Id: Idbdc6b00ca459ed10b1c79e64f004708594b92da

libs/binder/libbinder_rpc_unstable.cpp

diff --git a/libs/binder/libbinder_rpc_unstable.cpp b/libs/binder/libbinder_rpc_unstable.cpp
index bcb13ae..304415a 100644
--- a/libs/binder/libbinder_rpc_unstable.cpp
+++ b/libs/binder/libbinder_rpc_unstable.cpp
@@ -15,6 +15,7 @@
  */
 
 #include <android-base/logging.h>
+#include <android-base/unique_fd.h>
 #include <android/binder_libbinder.h>
 #include <binder/RpcServer.h>
 #include <binder/RpcSession.h>
@@ -24,6 +25,7 @@
 using android::RpcSession;
 using android::status_t;
 using android::statusToString;
+using android::base::unique_fd;
 
 extern "C" {
 
@@ -52,4 +54,14 @@
     }
     return AIBinder_fromPlatformBinder(session->getRootObject());
 }
+
+AIBinder* RpcPreconnectedClient(int (*requestFd)(void* param), void* param) {
+    auto session = RpcSession::make();
+    auto request = [=] { return unique_fd{requestFd(param)}; };
+    if (status_t status = session->setupPreconnectedClient(unique_fd{}, request); status != OK) {
+        LOG(ERROR) << "Failed to set up vsock client. error: " << statusToString(status).c_str();
+        return nullptr;
+    }
+    return AIBinder_fromPlatformBinder(session->getRootObject());
+}
 }