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 NATIVE_CLIENT_SRC_TRUSTED_PLUGIN_TEMPORARY_FILE_H_ 6 #define NATIVE_CLIENT_SRC_TRUSTED_PLUGIN_TEMPORARY_FILE_H_ 7 8 #include "native_client/src/include/nacl_macros.h" 9 #include "native_client/src/trusted/desc/nacl_desc_wrapper.h" 10 11 #include "ppapi/c/private/pp_file_handle.h" 12 13 namespace plugin { 14 15 class Plugin; 16 17 // Translation creates two temporary files. The first temporary file holds 18 // the object file created by llc. The second holds the nexe produced by 19 // the linker. Both of these temporary files are used to both write and 20 // read according to the following matrix: 21 // 22 // PnaclCoordinator::obj_file_: 23 // written by: llc (passed in explicitly through SRPC) 24 // read by: ld (returned via lookup service from SRPC) 25 // PnaclCoordinator::nexe_file_: 26 // written by: ld (passed in explicitly through SRPC) 27 // read by: sel_ldr (passed in explicitly to command channel) 28 // 29 30 // TempFile represents a file used as a temporary between stages in 31 // translation. It is automatically deleted when all handles are closed 32 // (or earlier -- immediately unlinked on POSIX systems). The file is only 33 // opened, once, but because both reading and writing are necessary (and in 34 // different processes), the user should reset / seek back to the beginning 35 // of the file between sessions. 36 class TempFile { 37 public: 38 // Create a TempFile. 39 explicit TempFile(Plugin* plugin); 40 ~TempFile(); 41 42 // Opens a temporary file object and descriptor wrapper referring to the file. 43 // If |writeable| is true, the descriptor will be opened for writing, and 44 // write_wrapper will return a valid pointer, otherwise it will return NULL. 45 int32_t Open(bool writeable); 46 // Resets file position of the handle, for reuse. 47 bool Reset(); 48 49 // Accessors. 50 // The nacl::DescWrapper* for the writeable version of the file. write_wrapper()51 nacl::DescWrapper* write_wrapper() { return write_wrapper_.get(); } read_wrapper()52 nacl::DescWrapper* read_wrapper() { return read_wrapper_.get(); } 53 54 // Returns the handle to the file repesented and resets the internal handle 55 // and all wrappers. 56 PP_FileHandle TakeFileHandle(); 57 58 // Used by GetNexeFd() to set the underlying internal handle. internal_handle()59 PP_FileHandle* internal_handle() { return &internal_handle_; } 60 61 private: 62 NACL_DISALLOW_COPY_AND_ASSIGN(TempFile); 63 64 Plugin* plugin_; 65 nacl::scoped_ptr<nacl::DescWrapper> read_wrapper_; 66 nacl::scoped_ptr<nacl::DescWrapper> write_wrapper_; 67 PP_FileHandle internal_handle_; 68 }; 69 70 } // namespace plugin 71 72 #endif // NATIVE_CLIENT_SRC_TRUSTED_PLUGIN_TEMPORARY_FILE_H_ 73