// 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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#ifndef CRASHPAD_UTIL_LINUX_AUXILIARY_VECTOR_H_
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#define CRASHPAD_UTIL_LINUX_AUXILIARY_VECTOR_H_
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#include <sys/types.h>
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#include <map>
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#include "base/logging.h"
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#include "base/macros.h"
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#include "util/linux/ptrace_connection.h"
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#include "util/misc/reinterpret_bytes.h"
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namespace crashpad {
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//! \brief Read the auxiliary vector for a target process.
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class AuxiliaryVector {
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public:
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AuxiliaryVector();
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~AuxiliaryVector();
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//! \brief Initializes this object with the auxiliary vector for the process
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//! connected via \a connection.
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//!
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//! This method must be called successfully prior to calling any other method
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//! in this class.
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//!
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//! \param[in] connection A connection to the target process.
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//!
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//! \return `true` on success, `false` on failure with a message logged.
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bool Initialize(PtraceConnection* connection);
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//! \brief Retrieve a value from the vector.
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//!
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//! \param[in] type Specifies which value should be retrieved. The possible
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//! values for this parameter are defined by `<linux/auxvec.h>`.
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//! \param[out] value The value, casted to an appropriate type, if found.
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//! \return `true` if the value is found.
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template <typename V>
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bool GetValue(uint64_t type, V* value) const {
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auto iter = values_.find(type);
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if (iter == values_.end()) {
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LOG(ERROR) << "value not found";
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return false;
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}
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return ReinterpretBytes(iter->second, value);
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}
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protected:
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std::map<uint64_t, uint64_t> values_;
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private:
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template <typename ULong>
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bool Read(PtraceConnection* connection);
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DISALLOW_COPY_AND_ASSIGN(AuxiliaryVector);
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};
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} // namespace crashpad
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#endif // CRASHPAD_UTIL_LINUX_AUXILIARY_VECTOR_H_
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