close_multiple.cc | Explore in Territory

// Copyright 2014 The Crashpad Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "util/posix/close_multiple.h"

#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <unistd.h>

#include <algorithm>
#include <iterator>

#include "base/check_op.h"
#include "base/files/scoped_file.h"
#include "base/logging.h"
#include "base/posix/eintr_wrapper.h"
#include "base/strings/string_number_conversions.h"
#include "build/build_config.h"
#include "util/file/directory_reader.h"
#include "util/misc/implicit_cast.h"

#if BUILDFLAG(IS_APPLE)
#include <sys/sysctl.h>
#endif

// Everything in this file is expected to execute between fork() and exec(),
// so everything called here must be acceptable in this context. However,
// logging code that is not expected to execute under normal circumstances is
// currently permitted.

namespace crashpad {
namespace {

// This function attempts to close |fd| or mark it as close-on-exec. On systems
// where close-on-exec is attempted, a failure to mark it close-on-exec will be
// followed by an attempt to close it. |ebadf_ok| should be set to |true| if
// the caller is attempting to close the file descriptor “blind,” that is,
// without knowledge that it is or is not a valid file descriptor.
void CloseNowOrOnExec(int fd, bool ebadf_ok) { … }

// This function implements CloseMultipleNowOrOnExec() using an operating
// system-specific FD directory to determine which file descriptors are open.
// This is an advantage over looping over all possible file descriptors, because
// no attempt needs to be made to close file descriptors that are not open.
bool CloseMultipleNowOrOnExecUsingFDDir(int min_fd, int preserve_fd) { … }

}  // namespace

void CloseMultipleNowOrOnExec(int fd, int preserve_fd) { … }

}  // namespace crashpad
chromium/third_party/crashpad/crashpad/util/posix/close_multiple.cc
