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6027e4657c
This is convenient in cross-platform code which needs to work with `UniqueFileHandle` objects. `dup` is not supported by wasi, so the method isn't available there. Differential Revision: https://phabricator.services.mozilla.com/D221370
57 lines
1.4 KiB
C++
57 lines
1.4 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 "UniquePtrExtensions.h"
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#include "mozilla/Assertions.h"
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#include "mozilla/DebugOnly.h"
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#ifdef XP_WIN
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# include <windows.h>
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#else
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# include <errno.h>
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# include <unistd.h>
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#endif
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namespace mozilla {
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namespace detail {
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void FileHandleDeleter::operator()(FileHandleHelper aHelper) {
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if (aHelper != nullptr) {
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DebugOnly<bool> ok;
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#ifdef XP_WIN
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ok = CloseHandle(aHelper);
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#else
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ok = close(aHelper) == 0 || errno == EINTR;
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#endif
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MOZ_ASSERT(ok, "failed to close file handle");
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}
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}
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} // namespace detail
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#ifndef __wasm__
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UniqueFileHandle DuplicateFileHandle(detail::FileHandleType aFile) {
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# ifdef XP_WIN
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if (aFile != INVALID_HANDLE_VALUE && aFile != NULL) {
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HANDLE handle;
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HANDLE currentProcess = ::GetCurrentProcess();
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if (::DuplicateHandle(currentProcess, aFile, currentProcess, &handle, 0,
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false, DUPLICATE_SAME_ACCESS)) {
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return UniqueFileHandle{handle};
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}
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}
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# else
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if (aFile != -1) {
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return UniqueFileHandle{dup(aFile)};
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}
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# endif
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return nullptr;
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}
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#endif
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} // namespace mozilla
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