diff options
Diffstat (limited to 'ipc/ipc_platform_file.cc')
-rw-r--r-- | ipc/ipc_platform_file.cc | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/ipc/ipc_platform_file.cc b/ipc/ipc_platform_file.cc new file mode 100644 index 000000000000..2b15cebfb885 --- /dev/null +++ b/ipc/ipc_platform_file.cc @@ -0,0 +1,43 @@ +// Copyright (c) 2011 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 "ipc/ipc_platform_file.h" + +namespace IPC { + +PlatformFileForTransit GetFileHandleForProcess(base::PlatformFile handle, + base::ProcessHandle process, + bool close_source_handle) { + IPC::PlatformFileForTransit out_handle; +#if defined(OS_WIN) + DWORD options = DUPLICATE_SAME_ACCESS; + if (close_source_handle) + options |= DUPLICATE_CLOSE_SOURCE; + if (!::DuplicateHandle(::GetCurrentProcess(), + handle, + process, + &out_handle, + 0, + FALSE, + options)) { + out_handle = IPC::InvalidPlatformFileForTransit(); + } +#elif defined(OS_POSIX) + // If asked to close the source, we can simply re-use the source fd instead of + // dup()ing and close()ing. + // When we're not closing the source, we need to duplicate the handle and take + // ownership of that. The reason is that this function is often used to + // generate IPC messages, and the handle must remain valid until it's sent to + // the other process from the I/O thread. Without the dup, calling code might + // close the source handle before the message is sent, creating a race + // condition. + int fd = close_source_handle ? handle : ::dup(handle); + out_handle = base::FileDescriptor(fd, true); +#else + #error Not implemented. +#endif + return out_handle; +} + +} // namespace IPC |