libbinder: replace RpcTransport::peek() with pollRead()

peek uses MSG_PEEK internally which only works with sockets.
This refactors that function into a more specific pollRead()
which works for e.g. pipes and other files.

Bug: 224644083
Test: atest binderRpcTest
Change-Id: I340fa7ee7a7bb2077115fc28835bcadf67db03d9

1 files changed, 1 insertions, 4 deletions

diff --git a/libs/binder/RpcState.cpp b/libs/binder/RpcState.cpp
index 6d89064a5d..4ef9cd859d 100644
--- a/libs/binder/RpcState.cpp
+++ b/libs/binder/RpcState.cpp
@@ -661,13 +661,10 @@ status_t RpcState::getAndExecuteCommand(const sp<RpcSession::RpcConnection>& con
 
 status_t RpcState::drainCommands(const sp<RpcSession::RpcConnection>& connection,
                                  const sp<RpcSession>& session, CommandType type) {
-    uint8_t buf;
     while (true) {
-        size_t num_bytes;
-        status_t status = connection->rpcTransport->peek(&buf, sizeof(buf), &num_bytes);
+        status_t status = connection->rpcTransport->pollRead();
         if (status == WOULD_BLOCK) break;
         if (status != OK) return status;
-        if (!num_bytes) break;
 
         status = getAndExecuteCommand(connection, session, type);
         if (status != OK) return status;