Mercurial > cpython-lru_cache-weakref

annotate Lib/os.py @ 4566:6403c94de50d legacy-trunk

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Added safeguard against failure in __del__.
author Guido van Rossum <guido@python.org>
date Wed, 27 Nov 1996 19:39:58 +0000
parents 4f73962aaba6
children 24d668454cb0
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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305748ebab43 Some minute changes.
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1 # os.py -- either mac, dos or posix depending on what system we're on.
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2
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3 # This exports:
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4 # - all functions from either posix or mac, e.g., os.unlink, os.stat, etc.
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5 # - os.path is either module posixpath or macpath
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6 # - os.name is either 'posix' or 'mac'
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7 # - os.curdir is a string representing the current directory ('.' or ':')
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8 # - os.pardir is a string representing the parent directory ('..' or '::')
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9 # - os.sep is the (or a most common) pathname separator ('/' or ':')
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10 # - os.pathsep is the component separator used in $PATH etc
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11 # - os.defpath is the default search path for executables
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12
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13 # Programs that import and use 'os' stand a better chance of being
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14 # portable between different platforms. Of course, they must then
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15 # only use functions that are defined by all platforms (e.g., unlink
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16 # and opendir), and leave all pathname manipulation to os.path
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17 # (e.g., split and join).
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18
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19 _osindex = {
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20 'posix': ('.', '..', '/', ':', ':/bin:/usr/bin'),
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21 'dos': ('.', '..', '\\', ';', '.;C:\\bin'),
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22 'nt': ('.', '..', '\\', ';', '.;C:\\bin'),
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23 'mac': (':', '::', ':', '\n', ':'),
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24 }
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25
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26 # For freeze.py script:
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27 if 0:
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28 import posix
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29 import posixpath
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30
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31 import sys
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32 for name in _osindex.keys():
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33 if name in sys.builtin_module_names:
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34 curdir, pardir, sep, pathsep, defpath = _osindex[name]
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35 exec 'from %s import *' % name
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36 exec 'import %spath' % name
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37 exec 'path = %spath' % name
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38 exec 'del %spath' % name
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39 try:
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40 exec 'from %s import _exit' % name
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41 except ImportError:
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42 pass
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43 try:
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44 environ
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45 except:
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46 environ = {} # Make sure os.environ exists, at least
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47 break
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48 else:
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49 del name
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50 raise ImportError, 'no os specific module found'
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51
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52 def execl(file, *args):
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53 execv(file, args)
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54
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55 def execle(file, *args):
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56 env = args[-1]
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57 execve(file, args[:-1], env)
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58
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59 def execlp(file, *args):
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60 execvp(file, args)
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61
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62 def execlpe(file, *args):
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63 env = args[-1]
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64 execvpe(file, args[:-1], env)
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65
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66 def execvp(file, args):
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67 _execvpe(file, args)
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68
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69 def execvpe(file, args, env):
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70 _execvpe(file, args, env)
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71
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72 _notfound = None
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73 def _execvpe(file, args, env = None):
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74 if env:
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75 func = execve
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76 argrest = (args, env)
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77 else:
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78 func = execv
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79 argrest = (args,)
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80 env = environ
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81 global _notfound
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82 head, tail = path.split(file)
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83 if head:
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84 apply(func, (file,) + argrest)
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85 return
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86 if env.has_key('PATH'):
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87 envpath = env['PATH']
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88 else:
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89 envpath = defpath
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90 import string
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91 PATH = string.splitfields(envpath, pathsep)
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92 if not _notfound:
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93 import tempfile
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94 # Exec a file that is guaranteed not to exist
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95 try: execv(tempfile.mktemp(), ())
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96 except error, _notfound: pass
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97 exc, arg = error, _notfound
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98 for dir in PATH:
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99 fullname = path.join(dir, file)
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100 try:
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101 apply(func, (fullname,) + argrest)
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102 except error, (errno, msg):
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103 if errno != arg[0]:
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104 exc, arg = error, (errno, msg)
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105 raise exc, arg
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106
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107 # Provide listdir for Windows NT that doesn't have it built in
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108 if name == 'nt':
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109 try:
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110 _tmp = listdir
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111 del _tmp
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112 except NameError:
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113 def listdir(name):
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114 if path.ismount(name):
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115 list = ['.']
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116 else:
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117 list = ['.', '..']
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118 f = popen('dir/l/b ' + name, 'r')
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119 line = f.readline()
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120 while line:
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121 list.append(line[:-1])
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122 line = f.readline()
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123 return list
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124
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125
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126 # Change environ to automatically call putenv() if it exists
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127 try:
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128 _putenv = putenv
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129 except NameError:
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130 _putenv = None
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131 if _putenv:
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132 import UserDict
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133
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134 class _Environ(UserDict.UserDict):
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135 def __init__(self, environ):
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136 UserDict.UserDict.__init__(self)
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137 self.data = environ
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138 def __setitem__(self, key, item):
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139 putenv(key, item)
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140 self.data[key] = item
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141
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142 environ = _Environ(environ)