// 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_PTRACE_CONNECTION_H_
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#define CRASHPAD_UTIL_LINUX_PTRACE_CONNECTION_H_
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#include <sys/types.h>
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#include <string>
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#include <vector>
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#include "base/files/file_path.h"
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#include "util/linux/thread_info.h"
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#include "util/process/process_memory.h"
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namespace crashpad {
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//! \brief Provides an interface for making `ptrace` requests against a process
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//! and its threads.
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class PtraceConnection {
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public:
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virtual ~PtraceConnection() {}
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//! \brief Returns the process ID of the connected process.
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virtual pid_t GetProcessID() = 0;
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//! \brief Adds a new thread to this connection.
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//!
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//! \param[in] tid The thread ID of the thread to attach.
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//! \return `true` on success. `false` on failure with a message logged.
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virtual bool Attach(pid_t tid) = 0;
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//! \brief Returns `true` if connected to a 64-bit process.
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virtual bool Is64Bit() = 0;
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//! \brief Retrieves a ThreadInfo for a target thread.
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//!
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//! \param[in] tid The thread ID of the target thread.
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//! \param[out] info Information about the thread.
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//! \return `true` on success. `false` on failure with a message logged.
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virtual bool GetThreadInfo(pid_t tid, ThreadInfo* info) = 0;
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//! \brief Reads the entire contents of a file.
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//!
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//! \param[in] path The path of the file to read.
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//! \param[out] contents The file contents, valid if this method returns
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//! `true`.
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//! \return `true` on success. `false` on failure with a message logged.
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virtual bool ReadFileContents(const base::FilePath& path,
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std::string* contents) = 0;
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//! \brief Returns a memory reader for the connected process.
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//!
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//! The caller does not take ownership of the reader. The reader is valid for
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//! the lifetime of the PtraceConnection that created it.
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virtual ProcessMemory* Memory() = 0;
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//! \brief Determines the thread IDs of the threads in the connected process.
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//!
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//! \param[out] threads The list of thread IDs.
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//! \return `true` on success, `false` on failure with a message logged. If
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//! this method returns `false`, \a threads may contain a partial list of
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//! thread IDs.
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virtual bool Threads(std::vector<pid_t>* threads) = 0;
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};
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} // namespace crashpad
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#endif // CRASHPAD_UTIL_LINUX_PTRACE_CONNECTION_H_
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