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Side by Side Diff: base/process/process_handle.h

Issue 1186873006: Add Get/SetUniqueIdForProcess. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Get rid of DCHECK_IS_ON. Created 5 years, 3 months ago
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1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #ifndef BASE_PROCESS_PROCESS_HANDLE_H_ 5 #ifndef BASE_PROCESS_PROCESS_HANDLE_H_
6 #define BASE_PROCESS_PROCESS_HANDLE_H_ 6 #define BASE_PROCESS_PROCESS_HANDLE_H_
7 7
8 #include <stdint.h>
9 #include <sys/types.h>
10
8 #include "base/base_export.h" 11 #include "base/base_export.h"
9 #include "base/basictypes.h"
10 #include "base/files/file_path.h" 12 #include "base/files/file_path.h"
11 #include "build/build_config.h" 13 #include "build/build_config.h"
12 14
13 #include <sys/types.h>
14 #if defined(OS_WIN) 15 #if defined(OS_WIN)
15 #include <windows.h> 16 #include <windows.h>
16 #endif 17 #endif
17 18
18 namespace base { 19 namespace base {
19 20
20 // ProcessHandle is a platform specific type which represents the underlying OS 21 // ProcessHandle is a platform specific type which represents the underlying OS
21 // handle to a process. 22 // handle to a process.
22 // ProcessId is a number which identifies the process in the OS. 23 // ProcessId is a number which identifies the process in the OS.
23 #if defined(OS_WIN) 24 #if defined(OS_WIN)
24 typedef HANDLE ProcessHandle; 25 typedef HANDLE ProcessHandle;
25 typedef DWORD ProcessId; 26 typedef DWORD ProcessId;
26 typedef HANDLE UserTokenHandle; 27 typedef HANDLE UserTokenHandle;
27 const ProcessHandle kNullProcessHandle = NULL; 28 const ProcessHandle kNullProcessHandle = NULL;
28 const ProcessId kNullProcessId = 0; 29 const ProcessId kNullProcessId = 0;
29 #elif defined(OS_POSIX) 30 #elif defined(OS_POSIX)
30 // On POSIX, our ProcessHandle will just be the PID. 31 // On POSIX, our ProcessHandle will just be the PID.
31 typedef pid_t ProcessHandle; 32 typedef pid_t ProcessHandle;
32 typedef pid_t ProcessId; 33 typedef pid_t ProcessId;
33 const ProcessHandle kNullProcessHandle = 0; 34 const ProcessHandle kNullProcessHandle = 0;
34 const ProcessId kNullProcessId = 0; 35 const ProcessId kNullProcessId = 0;
35 #endif // defined(OS_WIN) 36 #endif // defined(OS_WIN)
36 37
37 // Returns the id of the current process. 38 // Returns the id of the current process.
39 // Note that on some platforms, this is not guaranteed to be unique across
40 // processes (use GetUniqueIdForProcess if uniqueness is required).
38 BASE_EXPORT ProcessId GetCurrentProcId(); 41 BASE_EXPORT ProcessId GetCurrentProcId();
39 42
43 // Returns a unique ID for the current process. The ID will be unique across all
44 // currently running processes within the chrome session, but IDs of terminated
45 // processes may be reused. This returns an opaque value that is different from
46 // a process's PID.
47 BASE_EXPORT uint32_t GetUniqueIdForProcess();
48
49 #if defined(OS_LINUX)
50 // When a process is started in a different PID namespace from the browser
51 // process, this function must be called with the process's PID in the browser's
52 // PID namespace in order to initialize its unique ID. Not thread safe.
53 // WARNING: To avoid inconsistent results from GetUniqueIdForProcess, this
54 // should only be called very early after process startup - ideally as soon
55 // after process creation as possible.
56 BASE_EXPORT void InitUniqueIdForProcessInPidNamespace(
57 ProcessId pid_outside_of_namespace);
58 #endif
59
40 // Returns the ProcessHandle of the current process. 60 // Returns the ProcessHandle of the current process.
41 BASE_EXPORT ProcessHandle GetCurrentProcessHandle(); 61 BASE_EXPORT ProcessHandle GetCurrentProcessHandle();
42 62
43 // Returns the unique ID for the specified process. This is functionally the 63 // Returns the process ID for the specified process. This is functionally the
44 // same as Windows' GetProcessId(), but works on versions of Windows before 64 // same as Windows' GetProcessId(), but works on versions of Windows before Win
45 // Win XP SP1 as well. 65 // XP SP1 as well.
46 // DEPRECATED. New code should be using Process::Pid() instead. 66 // DEPRECATED. New code should be using Process::Pid() instead.
67 // Note that on some platforms, this is not guaranteed to be unique across
68 // processes.
47 BASE_EXPORT ProcessId GetProcId(ProcessHandle process); 69 BASE_EXPORT ProcessId GetProcId(ProcessHandle process);
48 70
49 #if defined(OS_POSIX) 71 #if defined(OS_POSIX)
50 // Returns the path to the executable of the given process. 72 // Returns the path to the executable of the given process.
51 BASE_EXPORT FilePath GetProcessExecutablePath(ProcessHandle process); 73 BASE_EXPORT FilePath GetProcessExecutablePath(ProcessHandle process);
52 74
53 // Returns the ID for the parent of the given process. 75 // Returns the ID for the parent of the given process.
54 BASE_EXPORT ProcessId GetParentProcessId(ProcessHandle process); 76 BASE_EXPORT ProcessId GetParentProcessId(ProcessHandle process);
55 #endif 77 #endif
56 78
57 } // namespace base 79 } // namespace base
58 80
59 #endif // BASE_PROCESS_PROCESS_HANDLE_H_ 81 #endif // BASE_PROCESS_PROCESS_HANDLE_H_
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