Add an interface for nacl to create delete-on-close temp files,

ppapi/native_client/src/trusted/plugin/temporary_file.cc

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "native_client/src/trusted/plugin/temporary_file.h"
+
+#include "native_client/src/include/portability_io.h"
+#include "native_client/src/shared/platform/nacl_check.h"
+#include "native_client/src/trusted/plugin/plugin.h"
+#include "native_client/src/trusted/plugin/utility.h"
+#include "native_client/src/trusted/service_runtime/include/sys/stat.h"
+
+#include "ppapi/cpp/core.h"
+#include "ppapi/cpp/instance.h"
+#include "ppapi/cpp/module.h"
+#include "ppapi/c/private/pp_file_handle.h"
+
+
+//////////////////////////////////////////////////////////////////////
+//  Temporary file access.
+//////////////////////////////////////////////////////////////////////
+
+namespace plugin {
+
+uint32_t TempFile::next_identifier = 0;
+
+TempFile::TempFile(Plugin* plugin) : plugin_(plugin) {
+  PLUGIN_PRINTF(("TempFile::TempFile\n"));
+  ++next_identifier;
+  SNPRINTF(reinterpret_cast<char *>(identifier_), sizeof identifier_,
+           "%"NACL_PRIu32, next_identifier);
+}
+
+TempFile::~TempFile() {
+  PLUGIN_PRINTF(("TempFile::~TempFile\n"));
+}
+
+void TempFile::Open(const pp::CompletionCallback& cb) {
+  PLUGIN_PRINTF(("TempFile::Open\n"));
+  PP_FileHandle file_handle =
+      plugin_->nacl_interface()->CreateTemporaryFile(plugin_->pp_instance());
+
+  pp::Core* core = pp::Module::Get()->core();
+  if (file_handle == PP_kInvalidFileHandle) {
+    PLUGIN_PRINTF(("TempFile::Open failed w/ PP_kInvalidFileHandle\n"));
+    core->CallOnMainThread(0, cb, PP_ERROR_FAILED);
+  }
+
+#if NACL_WINDOWS
+  HANDLE handle = file_handle;
+
+  //////// Now try the posix view.
+  int32_t posix_desc = _open_osfhandle(reinterpret_cast<intptr_t>(handle),
+                                       _O_RDWR | _O_BINARY
+                                       | _O_TEMPORARY | _O_SHORT_LIVED );
+  if (posix_desc == -1) {
+    PLUGIN_PRINTF(("TempFile::Open failed to convert HANDLE to posix\n"));
+    // Close the Windows HANDLE if it can't be converted.
+    CloseHandle(handle);
+  }
+  int32_t fd = posix_desc;
+#else
+  int32_t fd = file_handle;
+#endif
+
+  if (fd < 0) {
+    PLUGIN_PRINTF(("TempFile::Open failed\n"));
+    core->CallOnMainThread(0, cb, PP_ERROR_FAILED);
+    return;
+  }
+
+  // The descriptor for a writeable file needs to have quota management.
+  wrapper_.reset(
+    plugin_->wrapper_factory()->MakeFileDescQuota(fd, O_RDWR, identifier_));
+  core->CallOnMainThread(0, cb, PP_OK);
+}
+
+bool TempFile::Reset() {
+  PLUGIN_PRINTF(("TempFile::Reset\n"));
+  CHECK(wrapper_.get() != NULL);
+  nacl_off64_t newpos = wrapper_->Seek(0, SEEK_SET);
+  return newpos >= 0;
+}
+
+}  // namespace plugin