143 lines
4.6 KiB
C++
143 lines
4.6 KiB
C++
// Copyright (c) 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_PROCESS_PROCESS_HANDLE_H_
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#define BASE_PROCESS_PROCESS_HANDLE_H_
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#include <stdint.h>
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#include <sys/types.h>
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#include "base/base_export.h"
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#include "base/files/file_path.h"
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#include "build/build_config.h"
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#if defined(OS_WIN)
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#include "base/win/windows_types.h"
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#endif
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#if defined(OS_FUCHSIA)
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#include <zircon/types.h>
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#endif
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namespace base {
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// ProcessHandle is a platform specific type which represents the underlying OS
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// handle to a process.
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// ProcessId is a number which identifies the process in the OS.
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#if defined(OS_WIN)
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typedef HANDLE ProcessHandle;
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typedef DWORD ProcessId;
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typedef HANDLE UserTokenHandle;
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const ProcessHandle kNullProcessHandle = NULL;
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const ProcessId kNullProcessId = 0;
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#elif defined(OS_FUCHSIA)
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typedef zx_handle_t ProcessHandle;
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typedef zx_koid_t ProcessId;
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const ProcessHandle kNullProcessHandle = ZX_HANDLE_INVALID;
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const ProcessId kNullProcessId = ZX_KOID_INVALID;
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#elif defined(OS_POSIX)
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// On POSIX, our ProcessHandle will just be the PID.
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typedef pid_t ProcessHandle;
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typedef pid_t ProcessId;
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const ProcessHandle kNullProcessHandle = 0;
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const ProcessId kNullProcessId = 0;
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#endif // defined(OS_WIN)
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// To print ProcessIds portably use CrPRIdPid (based on PRIuS and friends from
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// C99 and format_macros.h) like this:
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// base::StringPrintf("PID is %" CrPRIdPid ".\n", pid);
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#if defined(OS_WIN) || defined(OS_FUCHSIA)
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#define CrPRIdPid "ld"
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#else
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#define CrPRIdPid "d"
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#endif
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class UniqueProcId {
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public:
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explicit UniqueProcId(ProcessId value) : value_(value) {}
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UniqueProcId(const UniqueProcId& other) = default;
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UniqueProcId& operator=(const UniqueProcId& other) = default;
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// Returns the process PID. WARNING: On some platforms, the pid may not be
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// valid within the current process sandbox.
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ProcessId GetUnsafeValue() const { return value_; }
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bool operator==(const UniqueProcId& other) const {
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return value_ == other.value_;
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}
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bool operator!=(const UniqueProcId& other) const {
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return value_ != other.value_;
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}
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bool operator<(const UniqueProcId& other) const {
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return value_ < other.value_;
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}
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bool operator<=(const UniqueProcId& other) const {
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return value_ <= other.value_;
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}
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bool operator>(const UniqueProcId& other) const {
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return value_ > other.value_;
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}
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bool operator>=(const UniqueProcId& other) const {
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return value_ >= other.value_;
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}
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private:
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ProcessId value_;
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};
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std::ostream& operator<<(std::ostream& os, const UniqueProcId& obj);
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// Returns the id of the current process.
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// Note that on some platforms, this is not guaranteed to be unique across
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// processes (use GetUniqueIdForProcess if uniqueness is required).
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BASE_EXPORT ProcessId GetCurrentProcId();
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// Returns a unique ID for the current process. The ID will be unique across all
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// currently running processes within the chrome session, but IDs of terminated
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// processes may be reused.
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BASE_EXPORT UniqueProcId GetUniqueIdForProcess();
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#if defined(OS_LINUX)
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// When a process is started in a different PID namespace from the browser
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// process, this function must be called with the process's PID in the browser's
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// PID namespace in order to initialize its unique ID. Not thread safe.
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// WARNING: To avoid inconsistent results from GetUniqueIdForProcess, this
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// should only be called very early after process startup - ideally as soon
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// after process creation as possible.
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BASE_EXPORT void InitUniqueIdForProcessInPidNamespace(
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ProcessId pid_outside_of_namespace);
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#endif
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// Returns the ProcessHandle of the current process.
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BASE_EXPORT ProcessHandle GetCurrentProcessHandle();
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// Returns the process ID for the specified process. This is functionally the
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// same as Windows' GetProcessId(), but works on versions of Windows before Win
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// XP SP1 as well.
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// DEPRECATED. New code should be using Process::Pid() instead.
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// Note that on some platforms, this is not guaranteed to be unique across
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// processes.
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BASE_EXPORT ProcessId GetProcId(ProcessHandle process);
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#if !defined(OS_FUCHSIA)
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// Returns the ID for the parent of the given process. Not available on Fuchsia.
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// Returning a negative value indicates an error, such as if the |process| does
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// not exist. Returns 0 when |process| has no parent process.
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BASE_EXPORT ProcessId GetParentProcessId(ProcessHandle process);
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#endif // !defined(OS_FUCHSIA)
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#if defined(OS_POSIX)
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// Returns the path to the executable of the given process.
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BASE_EXPORT FilePath GetProcessExecutablePath(ProcessHandle process);
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#endif
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} // namespace base
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#endif // BASE_PROCESS_PROCESS_HANDLE_H_
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