зеркало из https://github.com/mozilla/gecko-dev.git
80 строки
1.8 KiB
C++
80 строки
1.8 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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "SandboxOpenedFiles.h"
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#include "mozilla/Move.h"
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#include "SandboxLogging.h"
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#include <fcntl.h>
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#include <unistd.h>
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namespace mozilla {
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// The default move constructor almost works, but Atomic isn't
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// move-constructable and the fd needs some special handling.
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SandboxOpenedFile::SandboxOpenedFile(SandboxOpenedFile&& aMoved)
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: mPath(Move(aMoved.mPath))
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, mMaybeFd(aMoved.TakeDesc())
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, mDup(aMoved.mDup)
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, mExpectError(aMoved.mExpectError)
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{ }
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SandboxOpenedFile::SandboxOpenedFile(const char* aPath, bool aDup)
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: mPath(aPath), mDup(aDup), mExpectError(false)
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{
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MOZ_ASSERT(aPath[0] == '/', "path should be absolute");
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int fd = open(aPath, O_RDONLY | O_CLOEXEC);
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if (fd < 0) {
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mExpectError = true;
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}
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mMaybeFd = fd;
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}
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int
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SandboxOpenedFile::GetDesc() const
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{
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int fd = -1;
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if (mDup) {
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fd = mMaybeFd;
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if (fd >= 0) {
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fd = dup(fd);
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if (fd < 0) {
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SANDBOX_LOG_ERROR("dup: %s", strerror(errno));
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}
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}
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} else {
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fd = TakeDesc();
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}
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if (fd < 0 && !mExpectError) {
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SANDBOX_LOG_ERROR("unexpected multiple open of file %s", Path());
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}
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return fd;
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}
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SandboxOpenedFile::~SandboxOpenedFile()
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{
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int fd = TakeDesc();
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if (fd >= 0) {
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close(fd);
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}
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}
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int
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SandboxOpenedFiles::GetDesc(const char* aPath) const
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{
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for (const auto& file : mFiles) {
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if (strcmp(file.Path(), aPath) == 0) {
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return file.GetDesc();
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}
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}
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SANDBOX_LOG_ERROR("attempt to open unexpected file %s", aPath);
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return -1;
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}
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} // namespace mozilla
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