Mercurial > cpython-lru_cache-weakref

annotate Lib/posixfile.py @ 5817:48b94de85bf3 legacy-trunk

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Extensive changes by AMK.
author Guido van Rossum <guido@python.org>
date Thu, 17 Jul 1997 16:29:42 +0000
parents 25301b9ea0cc
children 39b413ac2cc9
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1 #
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2 # Start of posixfile.py
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3 #
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4
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5 #
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6 # Extended file operations
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7 #
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8 # f = posixfile.open(filename, [mode, [bufsize]])
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9 # will create a new posixfile object
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10 #
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11 # f = posixfile.fileopen(fileobject)
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12 # will create a posixfile object from a builtin file object
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13 #
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14 # f.file()
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15 # will return the original builtin file object
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16 #
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17 # f.dup()
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18 # will return a new file object based on a new filedescriptor
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19 #
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20 # f.dup2(fd)
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21 # will return a new file object based on the given filedescriptor
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22 #
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23 # f.flags(mode)
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24 # will turn on the associated flag (merge)
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25 # mode can contain the following characters:
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26 #
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27 # (character representing a flag)
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28 # a append only flag
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29 # c close on exec flag
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30 # n no delay flag
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31 # s synchronization flag
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32 # (modifiers)
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33 # ! turn flags 'off' instead of default 'on'
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34 # = copy flags 'as is' instead of default 'merge'
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35 # ? return a string in which the characters represent the flags
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36 # that are set
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37 #
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38 # note: - the '!' and '=' modifiers are mutually exclusive.
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39 # - the '?' modifier will return the status of the flags after they
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40 # have been changed by other characters in the mode string
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41 #
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42 # f.lock(mode [, len [, start [, whence]]])
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43 # will (un)lock a region
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44 # mode can contain the following characters:
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45 #
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46 # (character representing type of lock)
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47 # u unlock
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48 # r read lock
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49 # w write lock
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50 # (modifiers)
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51 # | wait until the lock can be granted
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52 # ? return the first lock conflicting with the requested lock
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53 # or 'None' if there is no conflict. The lock returned is in the
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54 # format (mode, len, start, whence, pid) where mode is a
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55 # character representing the type of lock ('r' or 'w')
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56 #
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57 # note: - the '?' modifier prevents a region from being locked; it is
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58 # query only
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59 #
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60
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61 class _posixfile_:
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62 states = ['open', 'closed']
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63
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64 #
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65 # Internal routines
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66 #
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67 def __repr__(self):
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68 file = self._file_
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69 return "<%s posixfile '%s', mode '%s' at %s>" % \
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70 (self.states[file.closed], file.name, file.mode, \
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71 hex(id(self))[2:])
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72
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73 def __del__(self):
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74 self._file_.close()
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75
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76 #
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77 # Initialization routines
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78 #
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79 def open(self, name, mode='r', bufsize=-1):
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80 import __builtin__
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81 return self.fileopen(__builtin__.open(name, mode, bufsize))
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82
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83 def fileopen(self, file):
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84 if `type(file)` != "<type 'file'>":
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85 raise TypeError, 'posixfile.fileopen() arg must be file object'
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86 self._file_ = file
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87 # Copy basic file methods
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88 for method in file.__methods__:
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89 setattr(self, method, getattr(file, method))
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90 return self
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91
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92 #
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93 # New methods
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94 #
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95 def file(self):
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96 return self._file_
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97
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98 def dup(self):
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99 import posix
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100
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101 try: ignore = posix.fdopen
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102 except: raise AttributeError, 'dup() method unavailable'
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103
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104 return posix.fdopen(posix.dup(self._file_.fileno()), self._file_.mode)
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105
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106 def dup2(self, fd):
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107 import posix
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108
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109 try: ignore = posix.fdopen
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110 except: raise AttributeError, 'dup() method unavailable'
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111
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112 posix.dup2(self._file_.fileno(), fd)
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113 return posix.fdopen(fd, self._file_.mode)
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114
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115 def flags(self, *which):
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116 import fcntl, FCNTL
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117
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118 if which:
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119 if len(which) > 1:
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120 raise TypeError, 'Too many arguments'
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121 which = which[0]
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122 else: which = '?'
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123
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124 l_flags = 0
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125 if 'n' in which: l_flags = l_flags | FCNTL.O_NDELAY
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126 if 'a' in which: l_flags = l_flags | FCNTL.O_APPEND
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127 if 's' in which: l_flags = l_flags | FCNTL.O_SYNC
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128
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129 file = self._file_
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130
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131 if '=' not in which:
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132 cur_fl = fcntl.fcntl(file.fileno(), FCNTL.F_GETFL, 0)
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133 if '!' in which: l_flags = cur_fl & ~ l_flags
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134 else: l_flags = cur_fl | l_flags
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135
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136 l_flags = fcntl.fcntl(file.fileno(), FCNTL.F_SETFL, l_flags)
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137
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138 if 'c' in which:
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139 arg = ('!' not in which) # 0 is don't, 1 is do close on exec
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140 l_flags = fcntl.fcntl(file.fileno(), FCNTL.F_SETFD, arg)
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141
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142 if '?' in which:
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143 which = '' # Return current flags
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144 l_flags = fcntl.fcntl(file.fileno(), FCNTL.F_GETFL, 0)
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145 if FCNTL.O_APPEND & l_flags: which = which + 'a'
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146 if fcntl.fcntl(file.fileno(), FCNTL.F_GETFD, 0) & 1:
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147 which = which + 'c'
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148 if FCNTL.O_NDELAY & l_flags: which = which + 'n'
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149 if FCNTL.O_SYNC & l_flags: which = which + 's'
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150 return which
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151
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152 def lock(self, how, *args):
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153 import struct, fcntl, FCNTL
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154
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155 if 'w' in how: l_type = FCNTL.F_WRLCK
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156 elif 'r' in how: l_type = FCNTL.F_RDLCK
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157 elif 'u' in how: l_type = FCNTL.F_UNLCK
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158 else: raise TypeError, 'no type of lock specified'
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159
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160 if '|' in how: cmd = FCNTL.F_SETLKW
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161 elif '?' in how: cmd = FCNTL.F_GETLK
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162 else: cmd = FCNTL.F_SETLK
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163
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164 l_whence = 0
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165 l_start = 0
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166 l_len = 0
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167
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168 if len(args) == 1:
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169 l_len = args[0]
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170 elif len(args) == 2:
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171 l_len, l_start = args
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172 elif len(args) == 3:
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173 l_len, l_start, l_whence = args
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174 elif len(args) > 3:
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175 raise TypeError, 'too many arguments'
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176
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177 # Hack by davem@magnet.com to get locking to go on freebsd;
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178 # additions for AIX by Vladimir.Marangozov@imag.fr
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179 import sys, os
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180 if sys.platform == 'freebsd2':
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181 flock = struct.pack('lxxxxlxxxxlhh', \
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182 l_start, l_len, os.getpid(), l_type, l_whence)
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183 elif sys.platform in ['aix3', 'aix4']:
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184 flock = struct.pack('hhlllii', \
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185 l_type, l_whence, l_start, l_len, 0, 0, 0)
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186 else:
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187 flock = struct.pack('hhllhh', \
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188 l_type, l_whence, l_start, l_len, 0, 0)
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189
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190 flock = fcntl.fcntl(self._file_.fileno(), cmd, flock)
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191
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192 if '?' in how:
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193 if sys.platform == 'freebsd2':
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194 l_start, l_len, l_pid, l_type, l_whence = \
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195 struct.unpack('lxxxxlxxxxlhh', flock)
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196 elif sys.platform in ['aix3', 'aix4']:
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197 l_type, l_whence, l_start, l_len, l_sysid, l_pid, l_vfs = \
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198 struct.unpack('hhlllii', flock)
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199 elif sys.platform == "linux2":
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200 l_type, l_whence, l_start, l_len, l_pid, l_sysid = \
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201 struct.unpack('hhllhh', flock)
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202 else:
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203 l_type, l_whence, l_start, l_len, l_sysid, l_pid = \
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204 struct.unpack('hhllhh', flock)
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205
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206 if l_type != FCNTL.F_UNLCK:
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207 if l_type == FCNTL.F_RDLCK:
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208 return 'r', l_len, l_start, l_whence, l_pid
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209 else:
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210 return 'w', l_len, l_start, l_whence, l_pid
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211
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212 #
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213 # Public routine to obtain a posixfile object
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214 #
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215 def open(name, mode='r', bufsize=-1):
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216 return _posixfile_().open(name, mode, bufsize)
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217
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218 def fileopen(file):
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219 return _posixfile_().fileopen(file)
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220
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221 #
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222 # Constants
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223 #
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224 SEEK_SET = 0
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225 SEEK_CUR = 1
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226 SEEK_END = 2
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227
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228 #
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229 # End of posixfile.py
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230 #