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-rw-r--r--libs/binder/RpcSession.cpp10
-rw-r--r--libs/binder/include/binder/RpcSession.h12
-rw-r--r--libs/binder/include_rpc_unstable/binder_rpc_unstable.hpp7
-rw-r--r--libs/binder/libbinder_rpc_unstable.cpp13
-rw-r--r--libs/binder/rust/rpcbinder/src/session.rs22
-rw-r--r--libs/binder/trusty/rust/binder_rpc_unstable_bindgen/rules.mk2
6 files changed, 50 insertions, 16 deletions
diff --git a/libs/binder/RpcSession.cpp b/libs/binder/RpcSession.cpp
index 16023ffa82..1f3a45a6df 100644
--- a/libs/binder/RpcSession.cpp
+++ b/libs/binder/RpcSession.cpp
@@ -188,7 +188,9 @@ status_t RpcSession::setupInetClient(const char* addr, unsigned int port) {
}
status_t RpcSession::setupPreconnectedClient(unique_fd fd, std::function<unique_fd()>&& request) {
- return setupClient([&](const std::vector<uint8_t>& sessionId, bool incoming) -> status_t {
+ return setupClient([&, fd = std::move(fd),
+ request = std::move(request)](const std::vector<uint8_t>& sessionId,
+ bool incoming) mutable -> status_t {
if (!fd.ok()) {
fd = request();
if (!fd.ok()) return BAD_VALUE;
@@ -476,8 +478,10 @@ sp<RpcServer> RpcSession::server() {
return server;
}
-status_t RpcSession::setupClient(const std::function<status_t(const std::vector<uint8_t>& sessionId,
- bool incoming)>& connectAndInit) {
+template <typename Fn,
+ typename /* = std::enable_if_t<std::is_invocable_r_v<
+ status_t, Fn, const std::vector<uint8_t>&, bool>> */>
+status_t RpcSession::setupClient(Fn&& connectAndInit) {
{
RpcMutexLockGuard _l(mMutex);
LOG_ALWAYS_FATAL_IF(mStartedSetup, "Must only setup session once");
diff --git a/libs/binder/include/binder/RpcSession.h b/libs/binder/include/binder/RpcSession.h
index af37bf29a4..c9f92da009 100644
--- a/libs/binder/include/binder/RpcSession.h
+++ b/libs/binder/include/binder/RpcSession.h
@@ -25,6 +25,7 @@
#include <map>
#include <optional>
+#include <type_traits>
#include <vector>
namespace android {
@@ -291,9 +292,14 @@ private:
// join on thread passed to preJoinThreadOwnership
static void join(sp<RpcSession>&& session, PreJoinSetupResult&& result);
- [[nodiscard]] status_t setupClient(
- const std::function<status_t(const std::vector<uint8_t>& sessionId, bool incoming)>&
- connectAndInit);
+ // This is a workaround to support move-only functors.
+ // TODO: use std::move_only_function when it becomes available.
+ template <typename Fn,
+ // Fn must be a callable type taking (const std::vector<uint8_t>&, bool) and returning
+ // status_t
+ typename = std::enable_if_t<
+ std::is_invocable_r_v<status_t, Fn, const std::vector<uint8_t>&, bool>>>
+ [[nodiscard]] status_t setupClient(Fn&& connectAndInit);
[[nodiscard]] status_t setupSocketClient(const RpcSocketAddress& address);
[[nodiscard]] status_t setupOneSocketConnection(const RpcSocketAddress& address,
const std::vector<uint8_t>& sessionId,
diff --git a/libs/binder/include_rpc_unstable/binder_rpc_unstable.hpp b/libs/binder/include_rpc_unstable/binder_rpc_unstable.hpp
index 48c0ea636b..1949cbb039 100644
--- a/libs/binder/include_rpc_unstable/binder_rpc_unstable.hpp
+++ b/libs/binder/include_rpc_unstable/binder_rpc_unstable.hpp
@@ -134,9 +134,14 @@ AIBinder* ARpcSession_setupInet(ARpcSession* session, const char* address, unsig
//
// param will be passed to requestFd. Callers can use param to pass contexts to
// the requestFd function.
+//
+// paramDeleteFd will be called when requestFd and param are no longer in use.
+// Callers can pass a function deleting param if necessary. Callers can set
+// paramDeleteFd to null if callers doesn't need to clean up param.
AIBinder* ARpcSession_setupPreconnectedClient(ARpcSession* session,
int (*requestFd)(void* param),
- void* param);
+ void* param,
+ void (*paramDeleteFd)(void* param));
// Sets the file descriptor transport mode for this session.
void ARpcSession_setFileDescriptorTransportMode(ARpcSession* session,
diff --git a/libs/binder/libbinder_rpc_unstable.cpp b/libs/binder/libbinder_rpc_unstable.cpp
index 64b1be25d2..8177fb07db 100644
--- a/libs/binder/libbinder_rpc_unstable.cpp
+++ b/libs/binder/libbinder_rpc_unstable.cpp
@@ -248,9 +248,18 @@ AIBinder* ARpcSession_setupInet(ARpcSession* handle, const char* address, unsign
#endif // __TRUSTY__
AIBinder* ARpcSession_setupPreconnectedClient(ARpcSession* handle, int (*requestFd)(void* param),
- void* param) {
+ void* param, void (*paramDeleteFd)(void* param)) {
auto session = handleToStrongPointer<RpcSession>(handle);
- auto request = [=] { return unique_fd{requestFd(param)}; };
+ auto deleter = [=](void* param) {
+ if (paramDeleteFd) {
+ paramDeleteFd(param);
+ }
+ };
+ // TODO: use unique_ptr once setupPreconnectedClient uses std::move_only_function.
+ std::shared_ptr<void> sharedParam(param, deleter);
+ auto request = [=, sharedParam = std::move(sharedParam)] {
+ return unique_fd{requestFd(sharedParam.get())};
+ };
if (status_t status = session->setupPreconnectedClient(unique_fd{}, request); status != OK) {
ALOGE("Failed to set up preconnected client. error: %s", statusToString(status).c_str());
return nullptr;
diff --git a/libs/binder/rust/rpcbinder/src/session.rs b/libs/binder/rust/rpcbinder/src/session.rs
index 09688a21a7..411b9de849 100644
--- a/libs/binder/rust/rpcbinder/src/session.rs
+++ b/libs/binder/rust/rpcbinder/src/session.rs
@@ -195,11 +195,13 @@ impl RpcSessionRef {
/// take ownership of) file descriptors already connected to it.
pub fn setup_preconnected_client<T: FromIBinder + ?Sized>(
&self,
- mut request_fd: impl FnMut() -> Option<RawFd>,
+ request_fd: impl FnMut() -> Option<RawFd>,
) -> Result<Strong<T>, StatusCode> {
- // Double reference the factory because trait objects aren't FFI safe.
- let mut request_fd_ref: RequestFd = &mut request_fd;
- let param = &mut request_fd_ref as *mut RequestFd as *mut c_void;
+ // Trait objects aren't FFI safe, so *mut c_void can't be converted back to
+ // *mut dyn FnMut() -> Option<RawFd>>. Double box the factory to make it possible to get
+ // the factory from *mut c_void (to *mut Box<dyn<...>>) in the callbacks.
+ let request_fd_box: Box<dyn FnMut() -> Option<RawFd>> = Box::new(request_fd);
+ let param = Box::into_raw(Box::new(request_fd_box)) as *mut c_void;
// SAFETY: AIBinder returned by RpcPreconnectedClient has correct reference count, and the
// ownership can be safely taken by new_spibinder. RpcPreconnectedClient does not take ownership
@@ -209,6 +211,7 @@ impl RpcSessionRef {
self.as_ptr(),
Some(request_fd_wrapper),
param,
+ Some(param_delete_fd_wrapper),
))
};
Self::get_interface(service)
@@ -225,13 +228,18 @@ impl RpcSessionRef {
}
}
-type RequestFd<'a> = &'a mut dyn FnMut() -> Option<RawFd>;
-
unsafe extern "C" fn request_fd_wrapper(param: *mut c_void) -> c_int {
- let request_fd_ptr = param as *mut RequestFd;
+ let request_fd_ptr = param as *mut Box<dyn FnMut() -> Option<RawFd>>;
// SAFETY: This is only ever called by RpcPreconnectedClient, within the lifetime of the
// BinderFdFactory reference, with param being a properly aligned non-null pointer to an
// initialized instance.
let request_fd = unsafe { request_fd_ptr.as_mut().unwrap() };
request_fd().unwrap_or(-1)
}
+
+unsafe extern "C" fn param_delete_fd_wrapper(param: *mut c_void) {
+ // SAFETY: This is only ever called by RpcPreconnectedClient, with param being the
+ // pointer returned from Box::into_raw.
+ let request_fd_box = unsafe { Box::from_raw(param as *mut Box<dyn FnMut() -> Option<RawFd>>) };
+ drop(request_fd_box);
+}
diff --git a/libs/binder/trusty/rust/binder_rpc_unstable_bindgen/rules.mk b/libs/binder/trusty/rust/binder_rpc_unstable_bindgen/rules.mk
index ef1b7c3cf8..40fc21867d 100644
--- a/libs/binder/trusty/rust/binder_rpc_unstable_bindgen/rules.mk
+++ b/libs/binder/trusty/rust/binder_rpc_unstable_bindgen/rules.mk
@@ -30,6 +30,8 @@ MODULE_LIBRARY_DEPS += \
trusty/user/base/lib/libstdc++-trusty \
trusty/user/base/lib/trusty-sys \
+MODULE_SRCDEPS := $(LIBBINDER_DIR)/include_rpc_unstable/binder_rpc_unstable.hpp
+
MODULE_BINDGEN_SRC_HEADER := $(LOCAL_DIR)/BinderBindings.hpp
MODULE_BINDGEN_FLAGS += \
generated by cgit v1.2.3-59-g8ed1b (git 2.39.0) at 2025-10-19 22:22:03 +0000