zircon/kernel/object/include/object/log_dispatcher.h

// Copyright 2016 The Fuchsia Authors
//
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file or at
// https://opensource.org/licenses/MIT

#ifndef ZIRCON_KERNEL_OBJECT_INCLUDE_OBJECT_LOG_DISPATCHER_H_
#define ZIRCON_KERNEL_OBJECT_INCLUDE_OBJECT_LOG_DISPATCHER_H_

#include <lib/debuglog.h>
#include <zircon/rights.h>
#include <zircon/types.h>

#include <ktl/string_view.h>
#include <object/dispatcher.h>
#include <object/handle.h>

class LogDispatcher final : public SoloDispatcher<LogDispatcher, ZX_DEFAULT_LOG_RIGHTS> {
 public:
  static zx_status_t Create(uint32_t flags, KernelHandle<LogDispatcher>* handle,
                            zx_rights_t* rights);

  ~LogDispatcher() final;
  zx_obj_type_t get_type() const final { return ZX_OBJ_TYPE_LOG; }

  zx_status_t Write(uint32_t severity, uint32_t flags, ktl::string_view str);
  zx_status_t Read(uint32_t flags, void* ptr, size_t len, size_t* actual);

 private:
  explicit LogDispatcher(uint32_t flags);

  static void Notify(void* cookie);
  void Signal();

  DlogReader reader_ TA_GUARDED(get_lock());
  const uint32_t flags_;
};

#endif  // ZIRCON_KERNEL_OBJECT_INCLUDE_OBJECT_LOG_DISPATCHER_H_