Mercurial > hg
annotate mercurial/win32.py @ 25245:504ef9c49f4a
util: allow to specify buffer size in popen4
We will need unbuffered IO to restore real time output with ssh peer.
Changeset ec171737aaf1 seems to indicate playing with this value could be
dangerous, but does not indicate why.
author | Pierre-Yves David <pierre-yves.david@fb.com> |
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date | Wed, 20 May 2015 11:29:45 -0500 |
parents | 232bf0028596 |
children | 328739ea70c3 |
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, msvcrt, 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_BROKEN_PIPE = 109 |
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30 _ERROR_INSUFFICIENT_BUFFER = 122 |
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31 |
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32 # WPARAM is defined as UINT_PTR (unsigned type) |
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33 # LPARAM is defined as LONG_PTR (signed type) |
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34 if ctypes.sizeof(ctypes.c_long) == ctypes.sizeof(ctypes.c_void_p): |
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35 _WPARAM = ctypes.c_ulong |
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36 _LPARAM = ctypes.c_long |
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37 elif ctypes.sizeof(ctypes.c_longlong) == ctypes.sizeof(ctypes.c_void_p): |
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38 _WPARAM = ctypes.c_ulonglong |
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39 _LPARAM = ctypes.c_longlong |
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40 |
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41 class _FILETIME(ctypes.Structure): |
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42 _fields_ = [('dwLowDateTime', _DWORD), |
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43 ('dwHighDateTime', _DWORD)] |
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44 |
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45 class _BY_HANDLE_FILE_INFORMATION(ctypes.Structure): |
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46 _fields_ = [('dwFileAttributes', _DWORD), |
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47 ('ftCreationTime', _FILETIME), |
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48 ('ftLastAccessTime', _FILETIME), |
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49 ('ftLastWriteTime', _FILETIME), |
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50 ('dwVolumeSerialNumber', _DWORD), |
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51 ('nFileSizeHigh', _DWORD), |
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52 ('nFileSizeLow', _DWORD), |
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53 ('nNumberOfLinks', _DWORD), |
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54 ('nFileIndexHigh', _DWORD), |
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55 ('nFileIndexLow', _DWORD)] |
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56 |
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57 # CreateFile |
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58 _FILE_SHARE_READ = 0x00000001 |
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59 _FILE_SHARE_WRITE = 0x00000002 |
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60 _FILE_SHARE_DELETE = 0x00000004 |
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61 |
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62 _OPEN_EXISTING = 3 |
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63 |
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64 _FILE_FLAG_BACKUP_SEMANTICS = 0x02000000 |
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65 |
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66 # SetFileAttributes |
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67 _FILE_ATTRIBUTE_NORMAL = 0x80 |
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68 _FILE_ATTRIBUTE_NOT_CONTENT_INDEXED = 0x2000 |
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69 |
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70 # Process Security and Access Rights |
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71 _PROCESS_QUERY_INFORMATION = 0x0400 |
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72 |
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73 # GetExitCodeProcess |
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74 _STILL_ACTIVE = 259 |
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75 |
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76 class _STARTUPINFO(ctypes.Structure): |
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77 _fields_ = [('cb', _DWORD), |
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78 ('lpReserved', _LPSTR), |
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79 ('lpDesktop', _LPSTR), |
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80 ('lpTitle', _LPSTR), |
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81 ('dwX', _DWORD), |
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82 ('dwY', _DWORD), |
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83 ('dwXSize', _DWORD), |
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84 ('dwYSize', _DWORD), |
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85 ('dwXCountChars', _DWORD), |
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86 ('dwYCountChars', _DWORD), |
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87 ('dwFillAttribute', _DWORD), |
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88 ('dwFlags', _DWORD), |
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89 ('wShowWindow', _WORD), |
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90 ('cbReserved2', _WORD), |
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91 ('lpReserved2', ctypes.c_char_p), |
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92 ('hStdInput', _HANDLE), |
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93 ('hStdOutput', _HANDLE), |
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94 ('hStdError', _HANDLE)] |
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95 |
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96 class _PROCESS_INFORMATION(ctypes.Structure): |
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97 _fields_ = [('hProcess', _HANDLE), |
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98 ('hThread', _HANDLE), |
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99 ('dwProcessId', _DWORD), |
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100 ('dwThreadId', _DWORD)] |
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101 |
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102 _CREATE_NO_WINDOW = 0x08000000 |
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103 _SW_HIDE = 0 |
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104 |
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105 class _COORD(ctypes.Structure): |
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106 _fields_ = [('X', ctypes.c_short), |
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107 ('Y', ctypes.c_short)] |
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108 |
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109 class _SMALL_RECT(ctypes.Structure): |
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110 _fields_ = [('Left', ctypes.c_short), |
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111 ('Top', ctypes.c_short), |
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112 ('Right', ctypes.c_short), |
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113 ('Bottom', ctypes.c_short)] |
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114 |
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115 class _CONSOLE_SCREEN_BUFFER_INFO(ctypes.Structure): |
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116 _fields_ = [('dwSize', _COORD), |
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117 ('dwCursorPosition', _COORD), |
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118 ('wAttributes', _WORD), |
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119 ('srWindow', _SMALL_RECT), |
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120 ('dwMaximumWindowSize', _COORD)] |
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121 |
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122 _STD_ERROR_HANDLE = _DWORD(-12).value |
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123 |
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124 # CreateToolhelp32Snapshot, Process32First, Process32Next |
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125 _TH32CS_SNAPPROCESS = 0x00000002 |
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126 _MAX_PATH = 260 |
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127 |
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128 class _tagPROCESSENTRY32(ctypes.Structure): |
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129 _fields_ = [('dwsize', _DWORD), |
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130 ('cntUsage', _DWORD), |
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131 ('th32ProcessID', _DWORD), |
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132 ('th32DefaultHeapID', ctypes.c_void_p), |
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133 ('th32ModuleID', _DWORD), |
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134 ('cntThreads', _DWORD), |
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135 ('th32ParentProcessID', _DWORD), |
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136 ('pcPriClassBase', _LONG), |
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137 ('dwFlags', _DWORD), |
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138 ('szExeFile', ctypes.c_char * _MAX_PATH)] |
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139 |
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140 def __init__(self): |
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141 super(_tagPROCESSENTRY32, self).__init__() |
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142 self.dwsize = ctypes.sizeof(self) |
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143 |
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144 |
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145 # types of parameters of C functions used (required by pypy) |
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146 |
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147 _kernel32.CreateFileA.argtypes = [_LPCSTR, _DWORD, _DWORD, ctypes.c_void_p, |
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148 _DWORD, _DWORD, _HANDLE] |
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149 _kernel32.CreateFileA.restype = _HANDLE |
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150 |
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151 _kernel32.GetFileInformationByHandle.argtypes = [_HANDLE, ctypes.c_void_p] |
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152 _kernel32.GetFileInformationByHandle.restype = _BOOL |
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153 |
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154 _kernel32.CloseHandle.argtypes = [_HANDLE] |
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155 _kernel32.CloseHandle.restype = _BOOL |
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156 |
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157 try: |
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158 _kernel32.CreateHardLinkA.argtypes = [_LPCSTR, _LPCSTR, ctypes.c_void_p] |
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159 _kernel32.CreateHardLinkA.restype = _BOOL |
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160 except AttributeError: |
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161 pass |
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162 |
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163 _kernel32.SetFileAttributesA.argtypes = [_LPCSTR, _DWORD] |
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164 _kernel32.SetFileAttributesA.restype = _BOOL |
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165 |
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166 _kernel32.OpenProcess.argtypes = [_DWORD, _BOOL, _DWORD] |
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167 _kernel32.OpenProcess.restype = _HANDLE |
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168 |
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169 _kernel32.GetExitCodeProcess.argtypes = [_HANDLE, ctypes.c_void_p] |
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170 _kernel32.GetExitCodeProcess.restype = _BOOL |
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171 |
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172 _kernel32.GetLastError.argtypes = [] |
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173 _kernel32.GetLastError.restype = _DWORD |
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174 |
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175 _kernel32.GetModuleFileNameA.argtypes = [_HANDLE, ctypes.c_void_p, _DWORD] |
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176 _kernel32.GetModuleFileNameA.restype = _DWORD |
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177 |
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178 _kernel32.CreateProcessA.argtypes = [_LPCSTR, _LPCSTR, ctypes.c_void_p, |
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179 ctypes.c_void_p, _BOOL, _DWORD, ctypes.c_void_p, _LPCSTR, ctypes.c_void_p, |
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180 ctypes.c_void_p] |
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181 _kernel32.CreateProcessA.restype = _BOOL |
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182 |
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183 _kernel32.ExitProcess.argtypes = [_UINT] |
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184 _kernel32.ExitProcess.restype = None |
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185 |
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186 _kernel32.GetCurrentProcessId.argtypes = [] |
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187 _kernel32.GetCurrentProcessId.restype = _DWORD |
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188 |
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189 _SIGNAL_HANDLER = ctypes.WINFUNCTYPE(_BOOL, _DWORD) |
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190 _kernel32.SetConsoleCtrlHandler.argtypes = [_SIGNAL_HANDLER, _BOOL] |
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191 _kernel32.SetConsoleCtrlHandler.restype = _BOOL |
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192 |
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193 _kernel32.GetStdHandle.argtypes = [_DWORD] |
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194 _kernel32.GetStdHandle.restype = _HANDLE |
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195 |
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196 _kernel32.GetConsoleScreenBufferInfo.argtypes = [_HANDLE, ctypes.c_void_p] |
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197 _kernel32.GetConsoleScreenBufferInfo.restype = _BOOL |
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198 |
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199 _advapi32.GetUserNameA.argtypes = [ctypes.c_void_p, ctypes.c_void_p] |
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200 _advapi32.GetUserNameA.restype = _BOOL |
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201 |
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202 _user32.GetWindowThreadProcessId.argtypes = [_HANDLE, ctypes.c_void_p] |
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203 _user32.GetWindowThreadProcessId.restype = _DWORD |
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204 |
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205 _user32.ShowWindow.argtypes = [_HANDLE, ctypes.c_int] |
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206 _user32.ShowWindow.restype = _BOOL |
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207 |
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208 _WNDENUMPROC = ctypes.WINFUNCTYPE(_BOOL, _HWND, _LPARAM) |
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209 _user32.EnumWindows.argtypes = [_WNDENUMPROC, _LPARAM] |
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210 _user32.EnumWindows.restype = _BOOL |
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211 |
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212 _kernel32.CreateToolhelp32Snapshot.argtypes = [_DWORD, _DWORD] |
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213 _kernel32.CreateToolhelp32Snapshot.restype = _BOOL |
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214 |
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215 _kernel32.PeekNamedPipe.argtypes = [_HANDLE, ctypes.c_void_p, _DWORD, |
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216 ctypes.c_void_p, ctypes.c_void_p, ctypes.c_void_p] |
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217 _kernel32.PeekNamedPipe.restype = _BOOL |
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218 |
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219 _kernel32.Process32First.argtypes = [_HANDLE, ctypes.c_void_p] |
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220 _kernel32.Process32First.restype = _BOOL |
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221 |
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222 _kernel32.Process32Next.argtypes = [_HANDLE, ctypes.c_void_p] |
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223 _kernel32.Process32Next.restype = _BOOL |
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224 |
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225 def _raiseoserror(name): |
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226 err = ctypes.WinError() |
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227 raise OSError(err.errno, '%s: %s' % (name, err.strerror)) |
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228 |
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229 def _getfileinfo(name): |
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230 fh = _kernel32.CreateFileA(name, 0, |
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231 _FILE_SHARE_READ | _FILE_SHARE_WRITE | _FILE_SHARE_DELETE, |
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232 None, _OPEN_EXISTING, _FILE_FLAG_BACKUP_SEMANTICS, None) |
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233 if fh == _INVALID_HANDLE_VALUE: |
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234 _raiseoserror(name) |
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235 try: |
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236 fi = _BY_HANDLE_FILE_INFORMATION() |
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237 if not _kernel32.GetFileInformationByHandle(fh, ctypes.byref(fi)): |
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238 _raiseoserror(name) |
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239 return fi |
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240 finally: |
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241 _kernel32.CloseHandle(fh) |
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242 |
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243 def oslink(src, dst): |
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244 try: |
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245 if not _kernel32.CreateHardLinkA(dst, src, None): |
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246 _raiseoserror(src) |
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247 except AttributeError: # Wine doesn't support this function |
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248 _raiseoserror(src) |
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249 |
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250 def nlinks(name): |
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251 '''return number of hardlinks for the given file''' |
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252 return _getfileinfo(name).nNumberOfLinks |
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253 |
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254 def samefile(path1, path2): |
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255 '''Returns whether path1 and path2 refer to the same file or directory.''' |
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256 res1 = _getfileinfo(path1) |
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257 res2 = _getfileinfo(path2) |
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258 return (res1.dwVolumeSerialNumber == res2.dwVolumeSerialNumber |
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259 and res1.nFileIndexHigh == res2.nFileIndexHigh |
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260 and res1.nFileIndexLow == res2.nFileIndexLow) |
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261 |
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262 def samedevice(path1, path2): |
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263 '''Returns whether path1 and path2 are on the same device.''' |
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264 res1 = _getfileinfo(path1) |
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265 res2 = _getfileinfo(path2) |
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266 return res1.dwVolumeSerialNumber == res2.dwVolumeSerialNumber |
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267 |
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268 def peekpipe(pipe): |
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269 handle = msvcrt.get_osfhandle(pipe.fileno()) |
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270 avail = _DWORD() |
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271 |
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272 if not _kernel32.PeekNamedPipe(handle, None, 0, None, ctypes.byref(avail), |
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273 None): |
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274 err = _kernel32.GetLastError() |
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275 if err == _ERROR_BROKEN_PIPE: |
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276 return 0 |
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277 raise ctypes.WinError(err) |
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278 |
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279 return avail.value |
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280 |
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281 def testpid(pid): |
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282 '''return True if pid is still running or unable to |
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283 determine, False otherwise''' |
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284 h = _kernel32.OpenProcess(_PROCESS_QUERY_INFORMATION, False, pid) |
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285 if h: |
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286 try: |
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287 status = _DWORD() |
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288 if _kernel32.GetExitCodeProcess(h, ctypes.byref(status)): |
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289 return status.value == _STILL_ACTIVE |
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290 finally: |
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291 _kernel32.CloseHandle(h) |
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292 return _kernel32.GetLastError() != _ERROR_INVALID_PARAMETER |
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293 |
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294 def executablepath(): |
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295 '''return full path of hg.exe''' |
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296 size = 600 |
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297 buf = ctypes.create_string_buffer(size + 1) |
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298 len = _kernel32.GetModuleFileNameA(None, ctypes.byref(buf), size) |
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299 if len == 0: |
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300 raise ctypes.WinError() # Note: WinError is a function |
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301 elif len == size: |
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302 raise ctypes.WinError(_ERROR_INSUFFICIENT_BUFFER) |
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303 return buf.value |
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304 |
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305 def getuser(): |
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306 '''return name of current user''' |
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307 size = _DWORD(300) |
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308 buf = ctypes.create_string_buffer(size.value + 1) |
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309 if not _advapi32.GetUserNameA(ctypes.byref(buf), ctypes.byref(size)): |
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310 raise ctypes.WinError() |
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311 return buf.value |
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312 |
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313 _signalhandler = [] |
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314 |
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315 def setsignalhandler(): |
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316 '''Register a termination handler for console events including |
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317 CTRL+C. python signal handlers do not work well with socket |
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318 operations. |
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319 ''' |
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320 def handler(event): |
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321 _kernel32.ExitProcess(1) |
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322 |
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323 if _signalhandler: |
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324 return # already registered |
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325 h = _SIGNAL_HANDLER(handler) |
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326 _signalhandler.append(h) # needed to prevent garbage collection |
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327 if not _kernel32.SetConsoleCtrlHandler(h, True): |
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328 raise ctypes.WinError() |
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329 |
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330 def hidewindow(): |
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331 |
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332 def callback(hwnd, pid): |
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333 wpid = _DWORD() |
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334 _user32.GetWindowThreadProcessId(hwnd, ctypes.byref(wpid)) |
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335 if pid == wpid.value: |
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336 _user32.ShowWindow(hwnd, _SW_HIDE) |
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337 return False # stop enumerating windows |
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338 return True |
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339 |
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340 pid = _kernel32.GetCurrentProcessId() |
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341 _user32.EnumWindows(_WNDENUMPROC(callback), pid) |
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342 |
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343 def termwidth(): |
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344 # cmd.exe does not handle CR like a unix console, the CR is |
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345 # counted in the line length. On 80 columns consoles, if 80 |
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346 # characters are written, the following CR won't apply on the |
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347 # current line but on the new one. Keep room for it. |
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348 width = 79 |
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349 # Query stderr to avoid problems with redirections |
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350 screenbuf = _kernel32.GetStdHandle( |
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351 _STD_ERROR_HANDLE) # don't close the handle returned |
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352 if screenbuf is None or screenbuf == _INVALID_HANDLE_VALUE: |
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353 return width |
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354 csbi = _CONSOLE_SCREEN_BUFFER_INFO() |
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355 if not _kernel32.GetConsoleScreenBufferInfo( |
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356 screenbuf, ctypes.byref(csbi)): |
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357 return width |
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358 width = csbi.srWindow.Right - csbi.srWindow.Left |
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359 return width |
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360 |
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361 def _1stchild(pid): |
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362 '''return the 1st found child of the given pid |
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363 |
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364 None is returned when no child is found''' |
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365 pe = _tagPROCESSENTRY32() |
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366 |
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367 # create handle to list all processes |
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368 ph = _kernel32.CreateToolhelp32Snapshot(_TH32CS_SNAPPROCESS, 0) |
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369 if ph == _INVALID_HANDLE_VALUE: |
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370 raise ctypes.WinError() |
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371 try: |
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372 r = _kernel32.Process32First(ph, ctypes.byref(pe)) |
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373 # loop over all processes |
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374 while r: |
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375 if pe.th32ParentProcessID == pid: |
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376 # return first child found |
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377 return pe.th32ProcessID |
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378 r = _kernel32.Process32Next(ph, ctypes.byref(pe)) |
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379 finally: |
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380 _kernel32.CloseHandle(ph) |
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381 if _kernel32.GetLastError() != _ERROR_NO_MORE_FILES: |
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382 raise ctypes.WinError() |
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383 return None # no child found |
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384 |
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385 class _tochildpid(int): # pid is _DWORD, which always matches in an int |
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386 '''helper for spawndetached, returns the child pid on conversion to string |
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387 |
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388 Does not resolve the child pid immediately because the child may not yet be |
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389 started. |
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390 ''' |
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391 def childpid(self): |
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392 '''returns the child pid of the first found child of the process |
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393 with this pid''' |
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394 return _1stchild(self) |
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395 def __str__(self): |
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396 # run when the pid is written to the file |
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397 ppid = self.childpid() |
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398 if ppid is None: |
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399 # race, child has exited since check |
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400 # fall back to this pid. Its process will also have disappeared, |
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401 # raising the same error type later as when the child pid would |
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402 # be returned. |
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403 return " %d" % self |
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404 return str(ppid) |
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405 |
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406 def spawndetached(args): |
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407 # No standard library function really spawns a fully detached |
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408 # process under win32 because they allocate pipes or other objects |
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409 # to handle standard streams communications. Passing these objects |
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410 # to the child process requires handle inheritance to be enabled |
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411 # which makes really detached processes impossible. |
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412 si = _STARTUPINFO() |
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413 si.cb = ctypes.sizeof(_STARTUPINFO) |
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414 |
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415 pi = _PROCESS_INFORMATION() |
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416 |
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417 env = '' |
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418 for k in os.environ: |
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419 env += "%s=%s\0" % (k, os.environ[k]) |
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420 if not env: |
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421 env = '\0' |
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422 env += '\0' |
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423 |
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424 args = subprocess.list2cmdline(args) |
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425 # Not running the command in shell mode makes Python 2.6 hang when |
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426 # writing to hgweb output socket. |
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427 comspec = os.environ.get("COMSPEC", "cmd.exe") |
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428 args = comspec + " /c " + args |
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429 |
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430 res = _kernel32.CreateProcessA( |
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431 None, args, None, None, False, _CREATE_NO_WINDOW, |
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432 env, os.getcwd(), ctypes.byref(si), ctypes.byref(pi)) |
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433 if not res: |
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434 raise ctypes.WinError() |
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435 |
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436 # _tochildpid because the process is the child of COMSPEC |
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437 return _tochildpid(pi.dwProcessId) |
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438 |
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439 def unlink(f): |
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440 '''try to implement POSIX' unlink semantics on Windows''' |
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441 |
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442 if os.path.isdir(f): |
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443 # use EPERM because it is POSIX prescribed value, even though |
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444 # unlink(2) on directories returns EISDIR on Linux |
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445 raise IOError(errno.EPERM, |
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446 "Unlinking directory not permitted: '%s'" % f) |
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447 |
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448 # POSIX allows to unlink and rename open files. Windows has serious |
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449 # problems with doing that: |
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450 # - Calling os.unlink (or os.rename) on a file f fails if f or any |
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451 # hardlinked copy of f has been opened with Python's open(). There is no |
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452 # way such a file can be deleted or renamed on Windows (other than |
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453 # scheduling the delete or rename for the next reboot). |
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454 # - Calling os.unlink on a file that has been opened with Mercurial's |
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455 # posixfile (or comparable methods) will delay the actual deletion of |
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456 # the file for as long as the file is held open. The filename is blocked |
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457 # during that time and cannot be used for recreating a new file under |
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458 # that same name ("zombie file"). Directories containing such zombie files |
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459 # cannot be removed or moved. |
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460 # A file that has been opened with posixfile can be renamed, so we rename |
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461 # f to a random temporary name before calling os.unlink on it. This allows |
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462 # callers to recreate f immediately while having other readers do their |
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463 # implicit zombie filename blocking on a temporary name. |
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464 |
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465 for tries in xrange(10): |
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466 temp = '%s-%08x' % (f, random.randint(0, 0xffffffff)) |
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467 try: |
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468 os.rename(f, temp) # raises OSError EEXIST if temp exists |
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469 break |
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470 except OSError, e: |
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471 if e.errno != errno.EEXIST: |
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472 raise |
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473 else: |
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474 raise IOError(errno.EEXIST, "No usable temporary filename found") |
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475 |
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476 try: |
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477 os.unlink(temp) |
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478 except OSError: |
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479 # The unlink might have failed because the READONLY attribute may heave |
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480 # been set on the original file. Rename works fine with READONLY set, |
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481 # but not os.unlink. Reset all attributes and try again. |
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482 _kernel32.SetFileAttributesA(temp, _FILE_ATTRIBUTE_NORMAL) |
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483 try: |
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484 os.unlink(temp) |
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485 except OSError: |
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486 # The unlink might have failed due to some very rude AV-Scanners. |
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487 # Leaking a tempfile is the lesser evil than aborting here and |
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488 # leaving some potentially serious inconsistencies. |
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489 pass |
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490 |
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491 def makedir(path, notindexed): |
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492 os.mkdir(path) |
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493 if notindexed: |
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494 _kernel32.SetFileAttributesA(path, _FILE_ATTRIBUTE_NOT_CONTENT_INDEXED) |