Mercurial > hg
annotate mercurial/win32.py @ 23324:69f86b937035
cmdserver: protect pipe server streams against corruption caused by direct io
Because pipe-mode server uses stdio as IPC channel, other modules should not
touch stdio directly and use ui instead. However, this strategy is brittle
because several Python functions read and write stdio implicitly.
print 'hello' # should use ui.write()
# => ch = 'h', size = 1701604463 'ello', data = '\n'
This patch adds protection for such mistakes. Both stdio files and low-level
file descriptors are redirected to /dev/null while command server uses them.
author | Yuya Nishihara <yuya@tcha.org> |
---|---|
date | Sat, 15 Nov 2014 13:50:43 +0900 |
parents | 4898c37e03c0 |
children | a2285e2fc949 |
rev | line source |
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8226
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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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util: split out posix, windows, and win32 modules
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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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Handle CTRL+C in serve under Windows.
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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 |
10240
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cmdutil: hide child window created by win32 spawndetached()
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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
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324 |
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termwidth: move to ui.ui from util
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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 |
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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)) |
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355 # loop over all processes |
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356 while r: |
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357 if pe.th32ParentProcessID == pid: |
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358 # return first child found |
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359 return pe.th32ProcessID |
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360 r = _kernel32.Process32Next(ph, ctypes.byref(pe)) |
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361 finally: |
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362 _kernel32.CloseHandle(ph) |
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363 if _kernel32.GetLastError() != _ERROR_NO_MORE_FILES: |
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364 raise ctypes.WinError |
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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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379 ppid = self.childpid() |
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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, |
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383 # raising the same error type later as when the child pid would |
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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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387 |
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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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393 # which makes really detached processes impossible. |
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394 si = _STARTUPINFO() |
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395 si.cb = ctypes.sizeof(_STARTUPINFO) |
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396 |
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397 pi = _PROCESS_INFORMATION() |
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398 |
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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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402 if not env: |
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403 env = '\0' |
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404 env += '\0' |
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405 |
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406 args = subprocess.list2cmdline(args) |
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407 # Not running the command in shell mode makes Python 2.6 hang when |
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408 # writing to hgweb output socket. |
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409 comspec = os.environ.get("COMSPEC", "cmd.exe") |
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410 args = comspec + " /c " + args |
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411 |
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412 res = _kernel32.CreateProcessA( |
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413 None, args, None, None, False, _CREATE_NO_WINDOW, |
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414 env, os.getcwd(), ctypes.byref(si), ctypes.byref(pi)) |
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415 if not res: |
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416 raise ctypes.WinError |
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417 |
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418 # _tochildpid because the process is the child of COMSPEC |
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419 return _tochildpid(pi.dwProcessId) |
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420 |
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421 def unlink(f): |
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422 '''try to implement POSIX' unlink semantics on Windows''' |
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423 |
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424 if os.path.isdir(f): |
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425 # use EPERM because it is POSIX prescribed value, even though |
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426 # unlink(2) on directories returns EISDIR on Linux |
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427 raise IOError(errno.EPERM, |
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428 "Unlinking directory not permitted: '%s'" % f) |
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429 |
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430 # POSIX allows to unlink and rename open files. Windows has serious |
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431 # problems with doing that: |
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432 # - Calling os.unlink (or os.rename) on a file f fails if f or any |
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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) |