126 lines
2.6 KiB
C++
126 lines
2.6 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "FileDescriptorUtils.h"
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#include "nsIEventTarget.h"
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#include "nsCOMPtr.h"
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#include "nsDebug.h"
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#include "nsNetCID.h"
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#include "nsServiceManagerUtils.h"
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#include "nsThreadUtils.h"
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#include "prio.h"
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#include "private/pprio.h"
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#include <errno.h>
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#ifdef XP_WIN
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#include <io.h>
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#else
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#include <unistd.h>
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#endif
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using mozilla::ipc::CloseFileRunnable;
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#ifdef DEBUG
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CloseFileRunnable::CloseFileRunnable(const FileDescriptor& aFileDescriptor)
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: mFileDescriptor(aFileDescriptor)
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{
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MOZ_ASSERT(aFileDescriptor.IsValid());
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}
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#endif // DEBUG
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CloseFileRunnable::~CloseFileRunnable()
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{
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if (mFileDescriptor.IsValid()) {
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// It's probably safer to take the main thread IO hit here rather than leak
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// the file descriptor.
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CloseFile();
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}
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}
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NS_IMPL_ISUPPORTS(CloseFileRunnable, nsIRunnable)
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void
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CloseFileRunnable::Dispatch()
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{
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nsCOMPtr<nsIEventTarget> eventTarget =
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do_GetService(NS_STREAMTRANSPORTSERVICE_CONTRACTID);
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NS_ENSURE_TRUE_VOID(eventTarget);
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nsresult rv = eventTarget->Dispatch(this, NS_DISPATCH_NORMAL);
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NS_ENSURE_SUCCESS_VOID(rv);
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}
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void
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CloseFileRunnable::CloseFile()
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{
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// It's possible for this to happen on the main thread if the dispatch to the
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// stream service fails so we can't assert the thread on which we're running.
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mFileDescriptor = FileDescriptor();
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}
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NS_IMETHODIMP
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CloseFileRunnable::Run()
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{
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MOZ_ASSERT(!NS_IsMainThread());
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CloseFile();
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return NS_OK;
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}
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namespace mozilla {
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namespace ipc {
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FILE*
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FileDescriptorToFILE(const FileDescriptor& aDesc,
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const char* aOpenMode)
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{
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if (!aDesc.IsValid()) {
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errno = EBADF;
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return nullptr;
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}
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auto handle = aDesc.ClonePlatformHandle();
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#ifdef XP_WIN
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int fd = _open_osfhandle(static_cast<intptr_t>(handle.get()), 0);
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if (fd == -1) {
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return nullptr;
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}
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Unused << handle.release();
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#else
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int fd = handle.release();
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#endif
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FILE* file = fdopen(fd, aOpenMode);
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if (!file) {
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int saved_errno = errno;
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close(fd);
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errno = saved_errno;
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}
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return file;
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}
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FileDescriptor
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FILEToFileDescriptor(FILE* aStream)
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{
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if (!aStream) {
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errno = EBADF;
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return FileDescriptor();
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}
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#ifdef XP_WIN
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int fd = _fileno(aStream);
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if (fd == -1) {
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return FileDescriptor();
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}
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return FileDescriptor(reinterpret_cast<HANDLE>(_get_osfhandle(fd)));
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#else
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return FileDescriptor(fileno(aStream));
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#endif
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}
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} // namespace ipc
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} // namespace mozilla
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