Mercurial > hg
annotate mercurial/win32.py @ 22449:da05fe01170b
revset: make descendants() lazier
Previously descendants() would force the provided subset to become a set. In
the case of revsets like '(%ld::) - (%ld)' (as used by histedit) this would
force the '- (%ld)' set to be evaluated, which produced a set containing every
commit in the repo (except %ld). This takes 0.6s on large repos.
This changes descendants to trust the subset to implement __contains__
efficiently, which improves the above revset to 0.16s. Shaving 0.4 seconds off
of histedit.
revset #27: (20000::) - (20000)
0) obsolete feature not enabled but 54243 markers found!
! wall 0.023640 comb 0.020000 user 0.020000 sys 0.000000 (best of 100)
1) obsolete feature not enabled but 54243 markers found!
! wall 0.019589 comb 0.020000 user 0.020000 sys 0.000000 (best of 100)
This commit removes the final revset related perf hotspot from histedit.
Combined with the previous two patches, they shave a little over 3 seconds off
histedit on large repos.
author | Durham Goode <durham@fb.com> |
---|---|
date | Fri, 12 Sep 2014 16:21:13 -0700 |
parents | 4898c37e03c0 |
children | a2285e2fc949 |
rev | line source |
---|---|
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1 # win32.py - utility functions that use win32 API |
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2 # |
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3 # Copyright 2005-2009 Matt Mackall <mpm@selenic.com> and others |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
10263 | 6 # GNU General Public License version 2 or any later version. |
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7 |
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8 import ctypes, errno, os, subprocess, random |
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9 |
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10 _kernel32 = ctypes.windll.kernel32 |
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11 _advapi32 = ctypes.windll.advapi32 |
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12 _user32 = ctypes.windll.user32 |
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13 |
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14 _BOOL = ctypes.c_long |
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15 _WORD = ctypes.c_ushort |
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16 _DWORD = ctypes.c_ulong |
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17 _UINT = ctypes.c_uint |
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18 _LONG = ctypes.c_long |
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19 _LPCSTR = _LPSTR = ctypes.c_char_p |
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20 _HANDLE = ctypes.c_void_p |
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21 _HWND = _HANDLE |
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22 |
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23 _INVALID_HANDLE_VALUE = _HANDLE(-1).value |
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24 |
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25 # GetLastError |
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26 _ERROR_SUCCESS = 0 |
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27 _ERROR_NO_MORE_FILES = 18 |
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28 _ERROR_INVALID_PARAMETER = 87 |
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29 _ERROR_INSUFFICIENT_BUFFER = 122 |
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30 |
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31 # WPARAM is defined as UINT_PTR (unsigned type) |
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32 # LPARAM is defined as LONG_PTR (signed type) |
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33 if ctypes.sizeof(ctypes.c_long) == ctypes.sizeof(ctypes.c_void_p): |
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34 _WPARAM = ctypes.c_ulong |
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35 _LPARAM = ctypes.c_long |
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36 elif ctypes.sizeof(ctypes.c_longlong) == ctypes.sizeof(ctypes.c_void_p): |
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37 _WPARAM = ctypes.c_ulonglong |
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38 _LPARAM = ctypes.c_longlong |
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39 |
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40 class _FILETIME(ctypes.Structure): |
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41 _fields_ = [('dwLowDateTime', _DWORD), |
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42 ('dwHighDateTime', _DWORD)] |
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43 |
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44 class _BY_HANDLE_FILE_INFORMATION(ctypes.Structure): |
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45 _fields_ = [('dwFileAttributes', _DWORD), |
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46 ('ftCreationTime', _FILETIME), |
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47 ('ftLastAccessTime', _FILETIME), |
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48 ('ftLastWriteTime', _FILETIME), |
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49 ('dwVolumeSerialNumber', _DWORD), |
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50 ('nFileSizeHigh', _DWORD), |
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51 ('nFileSizeLow', _DWORD), |
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52 ('nNumberOfLinks', _DWORD), |
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53 ('nFileIndexHigh', _DWORD), |
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54 ('nFileIndexLow', _DWORD)] |
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55 |
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56 # CreateFile |
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57 _FILE_SHARE_READ = 0x00000001 |
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58 _FILE_SHARE_WRITE = 0x00000002 |
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59 _FILE_SHARE_DELETE = 0x00000004 |
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60 |
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61 _OPEN_EXISTING = 3 |
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62 |
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63 _FILE_FLAG_BACKUP_SEMANTICS = 0x02000000 |
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64 |
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65 # SetFileAttributes |
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66 _FILE_ATTRIBUTE_NORMAL = 0x80 |
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67 _FILE_ATTRIBUTE_NOT_CONTENT_INDEXED = 0x2000 |
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68 |
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69 # Process Security and Access Rights |
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70 _PROCESS_QUERY_INFORMATION = 0x0400 |
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71 |
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72 # GetExitCodeProcess |
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73 _STILL_ACTIVE = 259 |
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74 |
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75 class _STARTUPINFO(ctypes.Structure): |
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76 _fields_ = [('cb', _DWORD), |
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77 ('lpReserved', _LPSTR), |
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78 ('lpDesktop', _LPSTR), |
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79 ('lpTitle', _LPSTR), |
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80 ('dwX', _DWORD), |
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81 ('dwY', _DWORD), |
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82 ('dwXSize', _DWORD), |
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83 ('dwYSize', _DWORD), |
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84 ('dwXCountChars', _DWORD), |
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85 ('dwYCountChars', _DWORD), |
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86 ('dwFillAttribute', _DWORD), |
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87 ('dwFlags', _DWORD), |
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88 ('wShowWindow', _WORD), |
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89 ('cbReserved2', _WORD), |
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90 ('lpReserved2', ctypes.c_char_p), |
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91 ('hStdInput', _HANDLE), |
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92 ('hStdOutput', _HANDLE), |
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93 ('hStdError', _HANDLE)] |
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94 |
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95 class _PROCESS_INFORMATION(ctypes.Structure): |
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96 _fields_ = [('hProcess', _HANDLE), |
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97 ('hThread', _HANDLE), |
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98 ('dwProcessId', _DWORD), |
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99 ('dwThreadId', _DWORD)] |
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100 |
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101 _CREATE_NO_WINDOW = 0x08000000 |
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102 _SW_HIDE = 0 |
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103 |
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104 class _COORD(ctypes.Structure): |
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105 _fields_ = [('X', ctypes.c_short), |
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106 ('Y', ctypes.c_short)] |
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107 |
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108 class _SMALL_RECT(ctypes.Structure): |
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109 _fields_ = [('Left', ctypes.c_short), |
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110 ('Top', ctypes.c_short), |
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111 ('Right', ctypes.c_short), |
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112 ('Bottom', ctypes.c_short)] |
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113 |
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114 class _CONSOLE_SCREEN_BUFFER_INFO(ctypes.Structure): |
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115 _fields_ = [('dwSize', _COORD), |
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116 ('dwCursorPosition', _COORD), |
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117 ('wAttributes', _WORD), |
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118 ('srWindow', _SMALL_RECT), |
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119 ('dwMaximumWindowSize', _COORD)] |
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120 |
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121 _STD_ERROR_HANDLE = _DWORD(-12).value |
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122 |
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123 # CreateToolhelp32Snapshot, Process32First, Process32Next |
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124 _TH32CS_SNAPPROCESS = 0x00000002 |
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125 _MAX_PATH = 260 |
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126 |
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127 class _tagPROCESSENTRY32(ctypes.Structure): |
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128 _fields_ = [('dwsize', _DWORD), |
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129 ('cntUsage', _DWORD), |
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130 ('th32ProcessID', _DWORD), |
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131 ('th32DefaultHeapID', ctypes.c_void_p), |
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132 ('th32ModuleID', _DWORD), |
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133 ('cntThreads', _DWORD), |
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134 ('th32ParentProcessID', _DWORD), |
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135 ('pcPriClassBase', _LONG), |
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136 ('dwFlags', _DWORD), |
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137 ('szExeFile', ctypes.c_char * _MAX_PATH)] |
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138 |
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139 def __init__(self): |
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140 super(_tagPROCESSENTRY32, self).__init__() |
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141 self.dwsize = ctypes.sizeof(self) |
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142 |
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143 |
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144 # types of parameters of C functions used (required by pypy) |
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145 |
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146 _kernel32.CreateFileA.argtypes = [_LPCSTR, _DWORD, _DWORD, ctypes.c_void_p, |
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147 _DWORD, _DWORD, _HANDLE] |
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148 _kernel32.CreateFileA.restype = _HANDLE |
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149 |
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150 _kernel32.GetFileInformationByHandle.argtypes = [_HANDLE, ctypes.c_void_p] |
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151 _kernel32.GetFileInformationByHandle.restype = _BOOL |
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152 |
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153 _kernel32.CloseHandle.argtypes = [_HANDLE] |
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154 _kernel32.CloseHandle.restype = _BOOL |
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155 |
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156 try: |
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157 _kernel32.CreateHardLinkA.argtypes = [_LPCSTR, _LPCSTR, ctypes.c_void_p] |
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158 _kernel32.CreateHardLinkA.restype = _BOOL |
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159 except AttributeError: |
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160 pass |
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161 |
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162 _kernel32.SetFileAttributesA.argtypes = [_LPCSTR, _DWORD] |
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163 _kernel32.SetFileAttributesA.restype = _BOOL |
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164 |
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165 _kernel32.OpenProcess.argtypes = [_DWORD, _BOOL, _DWORD] |
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166 _kernel32.OpenProcess.restype = _HANDLE |
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167 |
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168 _kernel32.GetExitCodeProcess.argtypes = [_HANDLE, ctypes.c_void_p] |
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169 _kernel32.GetExitCodeProcess.restype = _BOOL |
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170 |
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171 _kernel32.GetLastError.argtypes = [] |
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172 _kernel32.GetLastError.restype = _DWORD |
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173 |
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174 _kernel32.GetModuleFileNameA.argtypes = [_HANDLE, ctypes.c_void_p, _DWORD] |
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175 _kernel32.GetModuleFileNameA.restype = _DWORD |
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176 |
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177 _kernel32.CreateProcessA.argtypes = [_LPCSTR, _LPCSTR, ctypes.c_void_p, |
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178 ctypes.c_void_p, _BOOL, _DWORD, ctypes.c_void_p, _LPCSTR, ctypes.c_void_p, |
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179 ctypes.c_void_p] |
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180 _kernel32.CreateProcessA.restype = _BOOL |
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181 |
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182 _kernel32.ExitProcess.argtypes = [_UINT] |
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183 _kernel32.ExitProcess.restype = None |
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184 |
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185 _kernel32.GetCurrentProcessId.argtypes = [] |
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186 _kernel32.GetCurrentProcessId.restype = _DWORD |
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187 |
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188 _SIGNAL_HANDLER = ctypes.WINFUNCTYPE(_BOOL, _DWORD) |
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189 _kernel32.SetConsoleCtrlHandler.argtypes = [_SIGNAL_HANDLER, _BOOL] |
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190 _kernel32.SetConsoleCtrlHandler.restype = _BOOL |
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191 |
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192 _kernel32.GetStdHandle.argtypes = [_DWORD] |
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193 _kernel32.GetStdHandle.restype = _HANDLE |
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194 |
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195 _kernel32.GetConsoleScreenBufferInfo.argtypes = [_HANDLE, ctypes.c_void_p] |
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196 _kernel32.GetConsoleScreenBufferInfo.restype = _BOOL |
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197 |
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198 _advapi32.GetUserNameA.argtypes = [ctypes.c_void_p, ctypes.c_void_p] |
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199 _advapi32.GetUserNameA.restype = _BOOL |
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200 |
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201 _user32.GetWindowThreadProcessId.argtypes = [_HANDLE, ctypes.c_void_p] |
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202 _user32.GetWindowThreadProcessId.restype = _DWORD |
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203 |
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204 _user32.ShowWindow.argtypes = [_HANDLE, ctypes.c_int] |
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205 _user32.ShowWindow.restype = _BOOL |
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206 |
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207 _WNDENUMPROC = ctypes.WINFUNCTYPE(_BOOL, _HWND, _LPARAM) |
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208 _user32.EnumWindows.argtypes = [_WNDENUMPROC, _LPARAM] |
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209 _user32.EnumWindows.restype = _BOOL |
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210 |
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211 _kernel32.CreateToolhelp32Snapshot.argtypes = [_DWORD, _DWORD] |
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212 _kernel32.CreateToolhelp32Snapshot.restype = _BOOL |
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213 |
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214 _kernel32.Process32First.argtypes = [_HANDLE, ctypes.c_void_p] |
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215 _kernel32.Process32First.restype = _BOOL |
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216 |
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217 _kernel32.Process32Next.argtypes = [_HANDLE, ctypes.c_void_p] |
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218 _kernel32.Process32Next.restype = _BOOL |
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219 |
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220 def _raiseoserror(name): |
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221 err = ctypes.WinError() |
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222 raise OSError(err.errno, '%s: %s' % (name, err.strerror)) |
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223 |
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224 def _getfileinfo(name): |
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225 fh = _kernel32.CreateFileA(name, 0, |
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226 _FILE_SHARE_READ | _FILE_SHARE_WRITE | _FILE_SHARE_DELETE, |
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227 None, _OPEN_EXISTING, _FILE_FLAG_BACKUP_SEMANTICS, None) |
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228 if fh == _INVALID_HANDLE_VALUE: |
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229 _raiseoserror(name) |
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230 try: |
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231 fi = _BY_HANDLE_FILE_INFORMATION() |
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232 if not _kernel32.GetFileInformationByHandle(fh, ctypes.byref(fi)): |
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233 _raiseoserror(name) |
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234 return fi |
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235 finally: |
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236 _kernel32.CloseHandle(fh) |
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237 |
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238 def oslink(src, dst): |
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239 try: |
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240 if not _kernel32.CreateHardLinkA(dst, src, None): |
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241 _raiseoserror(src) |
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242 except AttributeError: # Wine doesn't support this function |
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243 _raiseoserror(src) |
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244 |
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245 def nlinks(name): |
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246 '''return number of hardlinks for the given file''' |
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247 return _getfileinfo(name).nNumberOfLinks |
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248 |
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249 def samefile(path1, path2): |
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250 '''Returns whether path1 and path2 refer to the same file or directory.''' |
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251 res1 = _getfileinfo(path1) |
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252 res2 = _getfileinfo(path2) |
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253 return (res1.dwVolumeSerialNumber == res2.dwVolumeSerialNumber |
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254 and res1.nFileIndexHigh == res2.nFileIndexHigh |
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255 and res1.nFileIndexLow == res2.nFileIndexLow) |
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256 |
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257 def samedevice(path1, path2): |
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258 '''Returns whether path1 and path2 are on the same device.''' |
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259 res1 = _getfileinfo(path1) |
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260 res2 = _getfileinfo(path2) |
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261 return res1.dwVolumeSerialNumber == res2.dwVolumeSerialNumber |
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262 |
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263 def testpid(pid): |
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264 '''return True if pid is still running or unable to |
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265 determine, False otherwise''' |
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266 h = _kernel32.OpenProcess(_PROCESS_QUERY_INFORMATION, False, pid) |
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267 if h: |
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268 try: |
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269 status = _DWORD() |
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270 if _kernel32.GetExitCodeProcess(h, ctypes.byref(status)): |
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271 return status.value == _STILL_ACTIVE |
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272 finally: |
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273 _kernel32.CloseHandle(h) |
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274 return _kernel32.GetLastError() != _ERROR_INVALID_PARAMETER |
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275 |
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276 def executablepath(): |
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277 '''return full path of hg.exe''' |
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278 size = 600 |
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279 buf = ctypes.create_string_buffer(size + 1) |
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280 len = _kernel32.GetModuleFileNameA(None, ctypes.byref(buf), size) |
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281 if len == 0: |
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282 raise ctypes.WinError |
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283 elif len == size: |
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284 raise ctypes.WinError(_ERROR_INSUFFICIENT_BUFFER) |
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285 return buf.value |
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286 |
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287 def getuser(): |
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288 '''return name of current user''' |
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289 size = _DWORD(300) |
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290 buf = ctypes.create_string_buffer(size.value + 1) |
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291 if not _advapi32.GetUserNameA(ctypes.byref(buf), ctypes.byref(size)): |
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292 raise ctypes.WinError |
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293 return buf.value |
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294 |
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295 _signalhandler = [] |
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296 |
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297 def setsignalhandler(): |
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298 '''Register a termination handler for console events including |
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299 CTRL+C. python signal handlers do not work well with socket |
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300 operations. |
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301 ''' |
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302 def handler(event): |
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303 _kernel32.ExitProcess(1) |
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304 |
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305 if _signalhandler: |
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306 return # already registered |
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307 h = _SIGNAL_HANDLER(handler) |
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308 _signalhandler.append(h) # needed to prevent garbage collection |
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309 if not _kernel32.SetConsoleCtrlHandler(h, True): |
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310 raise ctypes.WinError |
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311 |
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312 def hidewindow(): |
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313 |
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314 def callback(hwnd, pid): |
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315 wpid = _DWORD() |
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316 _user32.GetWindowThreadProcessId(hwnd, ctypes.byref(wpid)) |
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317 if pid == wpid.value: |
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318 _user32.ShowWindow(hwnd, _SW_HIDE) |
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319 return False # stop enumerating windows |
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320 return True |
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321 |
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322 pid = _kernel32.GetCurrentProcessId() |
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323 _user32.EnumWindows(_WNDENUMPROC(callback), pid) |
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win32: detect console width on Windows
Patrick Mezard <pmezard@gmail.com>
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324 |
12689
c52c629ce19e
termwidth: move to ui.ui from util
Augie Fackler <durin42@gmail.com>
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325 def termwidth(): |
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326 # cmd.exe does not handle CR like a unix console, the CR is |
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327 # counted in the line length. On 80 columns consoles, if 80 |
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328 # characters are written, the following CR won't apply on the |
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329 # current line but on the new one. Keep room for it. |
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330 width = 79 |
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331 # Query stderr to avoid problems with redirections |
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332 screenbuf = _kernel32.GetStdHandle( |
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333 _STD_ERROR_HANDLE) # don't close the handle returned |
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334 if screenbuf is None or screenbuf == _INVALID_HANDLE_VALUE: |
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335 return width |
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336 csbi = _CONSOLE_SCREEN_BUFFER_INFO() |
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337 if not _kernel32.GetConsoleScreenBufferInfo( |
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338 screenbuf, ctypes.byref(csbi)): |
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339 return width |
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340 width = csbi.srWindow.Right - csbi.srWindow.Left |
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341 return width |
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342 |
20425
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win32: spawndetached returns pid of detached process and not of cmd.exe
Simon Heimberg <simohe@besonet.ch>
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343 def _1stchild(pid): |
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344 '''return the 1st found child of the given pid |
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345 |
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346 None is returned when no child is found''' |
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347 pe = _tagPROCESSENTRY32() |
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348 |
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349 # create handle to list all processes |
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350 ph = _kernel32.CreateToolhelp32Snapshot(_TH32CS_SNAPPROCESS, 0) |
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351 if ph == _INVALID_HANDLE_VALUE: |
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352 raise ctypes.WinError |
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353 try: |
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354 r = _kernel32.Process32First(ph, ctypes.byref(pe)) |
ca6aa8362f33
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355 # loop over all processes |
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356 while r: |
ca6aa8362f33
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357 if pe.th32ParentProcessID == pid: |
ca6aa8362f33
win32: spawndetached returns pid of detached process and not of cmd.exe
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358 # return first child found |
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359 return pe.th32ProcessID |
ca6aa8362f33
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360 r = _kernel32.Process32Next(ph, ctypes.byref(pe)) |
ca6aa8362f33
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parents:
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361 finally: |
ca6aa8362f33
win32: spawndetached returns pid of detached process and not of cmd.exe
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parents:
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|
362 _kernel32.CloseHandle(ph) |
ca6aa8362f33
win32: spawndetached returns pid of detached process and not of cmd.exe
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parents:
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|
363 if _kernel32.GetLastError() != _ERROR_NO_MORE_FILES: |
ca6aa8362f33
win32: spawndetached returns pid of detached process and not of cmd.exe
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parents:
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|
364 raise ctypes.WinError |
ca6aa8362f33
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|
365 return None # no child found |
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366 |
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367 class _tochildpid(int): # pid is _DWORD, which always matches in an int |
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368 '''helper for spawndetached, returns the child pid on conversion to string |
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369 |
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370 Does not resolve the child pid immediately because the child may not yet be |
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371 started. |
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372 ''' |
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373 def childpid(self): |
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374 '''returns the child pid of the first found child of the process |
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375 with this pid''' |
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376 return _1stchild(self) |
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377 def __str__(self): |
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378 # run when the pid is written to the file |
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win32: spawndetached returns pid of detached process and not of cmd.exe
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changeset
|
379 ppid = self.childpid() |
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parents:
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380 if ppid is None: |
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381 # race, child has exited since check |
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382 # fall back to this pid. Its process will also have disappeared, |
ca6aa8362f33
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changeset
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383 # raising the same error type later as when the child pid would |
ca6aa8362f33
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changeset
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384 # be returned. |
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385 return " %d" % self |
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386 return str(ppid) |
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changeset
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387 |
13375
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changeset
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388 def spawndetached(args): |
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|
389 # No standard library function really spawns a fully detached |
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|
390 # process under win32 because they allocate pipes or other objects |
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391 # to handle standard streams communications. Passing these objects |
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392 # to the child process requires handle inheritance to be enabled |
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changeset
|
393 # which makes really detached processes impossible. |
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changeset
|
394 si = _STARTUPINFO() |
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changeset
|
395 si.cb = ctypes.sizeof(_STARTUPINFO) |
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changeset
|
396 |
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changeset
|
397 pi = _PROCESS_INFORMATION() |
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changeset
|
398 |
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changeset
|
399 env = '' |
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|
400 for k in os.environ: |
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401 env += "%s=%s\0" % (k, os.environ[k]) |
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changeset
|
402 if not env: |
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403 env = '\0' |
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|
404 env += '\0' |
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changeset
|
405 |
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changeset
|
406 args = subprocess.list2cmdline(args) |
17428
72803c8edaa4
avoid using abbreviations that look like spelling errors
Mads Kiilerich <mads@kiilerich.com>
parents:
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diff
changeset
|
407 # Not running the command in shell mode makes Python 2.6 hang when |
13375
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changeset
|
408 # writing to hgweb output socket. |
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|
409 comspec = os.environ.get("COMSPEC", "cmd.exe") |
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changeset
|
410 args = comspec + " /c " + args |
f1fa8f481c7c
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parents:
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changeset
|
411 |
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changeset
|
412 res = _kernel32.CreateProcessA( |
17050
e780fb37168b
win32: specify _CREATE_NO_WINDOW on spawndetached()
Adrian Buehlmann <adrian@cadifra.com>
parents:
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diff
changeset
|
413 None, args, None, None, False, _CREATE_NO_WINDOW, |
13375
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changeset
|
414 env, os.getcwd(), ctypes.byref(si), ctypes.byref(pi)) |
f1fa8f481c7c
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changeset
|
415 if not res: |
16687
e34106fa0dc3
cleanup: "raise SomeException()" -> "raise SomeException"
Brodie Rao <brodie@sf.io>
parents:
15095
diff
changeset
|
416 raise ctypes.WinError |
13375
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changeset
|
417 |
20425
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changeset
|
418 # _tochildpid because the process is the child of COMSPEC |
ca6aa8362f33
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changeset
|
419 return _tochildpid(pi.dwProcessId) |
13775
930efdc6bfa4
windows: move unlink to win32.py
Adrian Buehlmann <adrian@cadifra.com>
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changeset
|
420 |
930efdc6bfa4
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changeset
|
421 def unlink(f): |
930efdc6bfa4
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changeset
|
422 '''try to implement POSIX' unlink semantics on Windows''' |
930efdc6bfa4
windows: move unlink to win32.py
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changeset
|
423 |
21226
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win32: backout 1a9ebc83a74c
Steve Borho <steve@borho.org>
parents:
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diff
changeset
|
424 if os.path.isdir(f): |
4898c37e03c0
win32: backout 1a9ebc83a74c
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parents:
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diff
changeset
|
425 # use EPERM because it is POSIX prescribed value, even though |
4898c37e03c0
win32: backout 1a9ebc83a74c
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parents:
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changeset
|
426 # unlink(2) on directories returns EISDIR on Linux |
4898c37e03c0
win32: backout 1a9ebc83a74c
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parents:
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changeset
|
427 raise IOError(errno.EPERM, |
4898c37e03c0
win32: backout 1a9ebc83a74c
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parents:
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diff
changeset
|
428 "Unlinking directory not permitted: '%s'" % f) |
19159
1b329f8c7b24
windows: check target type before actual unlinking to follow POSIX semantics
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
18959
diff
changeset
|
429 |
13775
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changeset
|
430 # POSIX allows to unlink and rename open files. Windows has serious |
930efdc6bfa4
windows: move unlink to win32.py
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changeset
|
431 # problems with doing that: |
930efdc6bfa4
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changeset
|
432 # - Calling os.unlink (or os.rename) on a file f fails if f or any |
930efdc6bfa4
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changeset
|
433 # hardlinked copy of f has been opened with Python's open(). There is no |
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434 # way such a file can be deleted or renamed on Windows (other than |
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435 # scheduling the delete or rename for the next reboot). |
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436 # - Calling os.unlink on a file that has been opened with Mercurial's |
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437 # posixfile (or comparable methods) will delay the actual deletion of |
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438 # the file for as long as the file is held open. The filename is blocked |
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439 # during that time and cannot be used for recreating a new file under |
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440 # that same name ("zombie file"). Directories containing such zombie files |
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441 # cannot be removed or moved. |
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442 # A file that has been opened with posixfile can be renamed, so we rename |
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443 # f to a random temporary name before calling os.unlink on it. This allows |
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444 # callers to recreate f immediately while having other readers do their |
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445 # implicit zombie filename blocking on a temporary name. |
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446 |
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447 for tries in xrange(10): |
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448 temp = '%s-%08x' % (f, random.randint(0, 0xffffffff)) |
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449 try: |
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450 os.rename(f, temp) # raises OSError EEXIST if temp exists |
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451 break |
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452 except OSError, e: |
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453 if e.errno != errno.EEXIST: |
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454 raise |
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455 else: |
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456 raise IOError(errno.EEXIST, "No usable temporary filename found") |
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457 |
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458 try: |
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459 os.unlink(temp) |
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460 except OSError: |
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461 # The unlink might have failed because the READONLY attribute may heave |
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462 # been set on the original file. Rename works fine with READONLY set, |
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463 # but not os.unlink. Reset all attributes and try again. |
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464 _kernel32.SetFileAttributesA(temp, _FILE_ATTRIBUTE_NORMAL) |
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465 try: |
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466 os.unlink(temp) |
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467 except OSError: |
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468 # The unlink might have failed due to some very rude AV-Scanners. |
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469 # Leaking a tempfile is the lesser evil than aborting here and |
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470 # leaving some potentially serious inconsistencies. |
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471 pass |
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472 |
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473 def makedir(path, notindexed): |
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474 os.mkdir(path) |
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475 if notindexed: |
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476 _kernel32.SetFileAttributesA(path, _FILE_ATTRIBUTE_NOT_CONTENT_INDEXED) |