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8c802aace4
This renames and improves the VariableSizeBitCast helper from util/linux/auxiliary_vector.* and moves it to misc. Change-Id: I4bf46f4cfc0e60c900ff9bde467a21ad43c684cd Reviewed-on: https://chromium-review.googlesource.com/534174 Commit-Queue: Joshua Peraza <jperaza@chromium.org> Reviewed-by: Mark Mentovai <mark@chromium.org>
63 lines
1.7 KiB
C++
63 lines
1.7 KiB
C++
// Copyright 2017 The Crashpad Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "util/linux/auxiliary_vector.h"
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#include <linux/auxvec.h>
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#include <stdio.h>
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#include "base/files/file_path.h"
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#include "base/logging.h"
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#include "util/file/file_reader.h"
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#include "util/stdlib/map_insert.h"
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namespace crashpad {
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AuxiliaryVector::AuxiliaryVector() : values_() {}
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AuxiliaryVector::~AuxiliaryVector() {}
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bool AuxiliaryVector::Initialize(pid_t pid, bool is_64_bit) {
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return is_64_bit ? Read<uint64_t>(pid) : Read<uint32_t>(pid);
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}
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template <typename ULong>
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bool AuxiliaryVector::Read(pid_t pid) {
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char path[32];
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snprintf(path, sizeof(path), "/proc/%d/auxv", pid);
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FileReader aux_file;
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if (!aux_file.Open(base::FilePath(path))) {
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return false;
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}
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ULong type;
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ULong value;
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while (aux_file.ReadExactly(&type, sizeof(type)) &&
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aux_file.ReadExactly(&value, sizeof(value))) {
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if (type == AT_NULL && value == 0) {
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return true;
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}
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if (type == AT_IGNORE) {
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continue;
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}
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if (!MapInsertOrReplace(&values_, type, value, nullptr)) {
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LOG(ERROR) << "duplicate auxv entry";
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return false;
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}
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}
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return false;
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}
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} // namespace crashpad
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