1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef LIBRARIES_NACL_IO_KERNEL_HANDLE_H_ 6 #define LIBRARIES_NACL_IO_KERNEL_HANDLE_H_ 7 8 #include <pthread.h> 9 10 #include "nacl_io/error.h" 11 #include "nacl_io/mount.h" 12 #include "nacl_io/mount_node.h" 13 #include "nacl_io/ostypes.h" 14 15 #include "sdk_util/macros.h" 16 #include "sdk_util/ref_object.h" 17 #include "sdk_util/scoped_ref.h" 18 #include "sdk_util/simple_lock.h" 19 20 namespace nacl_io { 21 22 // KernelHandle provides a reference counted container for the open 23 // file information, such as it's mount, node, access type and offset. 24 // KernelHandle can only be referenced when the KernelProxy lock is held. 25 class KernelHandle : public sdk_util::RefObject { 26 public: 27 KernelHandle(); 28 KernelHandle(const ScopedMount& mnt, const ScopedMountNode& node); 29 ~KernelHandle(); 30 31 Error Init(int open_flags); 32 33 // Assumes |out_offset| is non-NULL. 34 Error Seek(off_t offset, int whence, off_t* out_offset); 35 36 // Dispatches Read, Write, GetDents to atomically update offs_. 37 Error Read(void* buf, size_t nbytes, int* bytes_read); 38 Error Write(const void* buf, size_t nbytes, int* bytes_written); 39 Error GetDents(struct dirent* pdir, size_t count, int* bytes_written); 40 41 const ScopedMountNode& node() { return node_; } 42 const ScopedMount& mount() { return mount_; } 43 44 private: 45 ScopedMount mount_; 46 ScopedMountNode node_; 47 sdk_util::SimpleLock offs_lock_; 48 size_t offs_; 49 50 friend class KernelProxy; 51 DISALLOW_COPY_AND_ASSIGN(KernelHandle); 52 }; 53 54 typedef sdk_util::ScopedRef<KernelHandle> ScopedKernelHandle; 55 56 } // namespace nacl_io 57 58 #endif // LIBRARIES_NACL_IO_KERNEL_HANDLE_H_ 59
