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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_APPLE_SCOPED_MACH_PORT_H_
#define BASE_APPLE_SCOPED_MACH_PORT_H_
#include <mach/mach.h>
#include <optional>
#include "base/base_export.h"
#include "base/scoped_generic.h"
namespace base::apple {
namespace internal {
struct BASE_EXPORT SendRightTraits {
static mach_port_t InvalidValue() { return MACH_PORT_NULL; }
BASE_EXPORT static void Free(mach_port_t port);
};
struct BASE_EXPORT ReceiveRightTraits {
static mach_port_t InvalidValue() { return MACH_PORT_NULL; }
BASE_EXPORT static void Free(mach_port_t port);
};
struct PortSetTraits {
static mach_port_t InvalidValue() { return MACH_PORT_NULL; }
BASE_EXPORT static void Free(mach_port_t port);
};
} // namespace internal
// A scoper for handling a Mach port that names a send right. Send rights are
// reference counted, and this takes ownership of the right on construction
// and then removes a reference to the right on destruction. If the reference
// is the last one on the right, the right is deallocated.
using ScopedMachSendRight =
ScopedGeneric<mach_port_t, internal::SendRightTraits>;
// A scoper for handling a Mach port's receive right. There is only one
// receive right per port. This takes ownership of the receive right on
// construction and then destroys the right on destruction, turning all
// outstanding send rights into dead names.
using ScopedMachReceiveRight =
ScopedGeneric<mach_port_t, internal::ReceiveRightTraits>;
// A scoper for handling a Mach port set. A port set can have only one
// reference. This takes ownership of that single reference on construction and
// destroys the port set on destruction. Destroying a port set does not destroy
// the receive rights that are members of the port set.
using ScopedMachPortSet = ScopedGeneric<mach_port_t, internal::PortSetTraits>;
// Constructs a Mach port receive right and places the result in |receive|.
// If |send| is non-null, a send right will be created as well and stored
// there. If |queue_limit| is specified, the receive right will be constructed
// with the specified mpo_qlmit. Returns true on success and false on failure.
BASE_EXPORT bool CreateMachPort(
ScopedMachReceiveRight* receive,
ScopedMachSendRight* send,
std::optional<mach_port_msgcount_t> queue_limit = std::nullopt);
// Increases the user reference count for MACH_PORT_RIGHT_SEND by 1 and returns
// a new scoper to manage the additional right.
BASE_EXPORT ScopedMachSendRight RetainMachSendRight(mach_port_t port);
} // namespace base::apple
#endif // BASE_APPLE_SCOPED_MACH_PORT_H_
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