Mercurial > repos > bcclaywell > argo_navis
annotate venv/lib/python2.7/os.py @ 0:d67268158946 draft
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author | bcclaywell |
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date | Mon, 12 Oct 2015 17:43:33 -0400 |
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1 r"""OS routines for NT 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 posix, nt, os2, or ce, e.g. unlink, stat, etc. |
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5 - os.path is one of the modules posixpath, or ntpath |
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6 - os.name is 'posix', 'nt', 'os2', 'ce' or 'riscos' |
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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 ':' or '\\') |
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10 - os.extsep is the extension separator ('.' or '/') |
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11 - os.altsep is the alternate pathname separator (None or '/') |
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12 - os.pathsep is the component separator used in $PATH etc |
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13 - os.linesep is the line separator in text files ('\r' or '\n' or '\r\n') |
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14 - os.defpath is the default search path for executables |
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15 - os.devnull is the file path of the null device ('/dev/null', etc.) |
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16 |
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17 Programs that import and use 'os' stand a better chance of being |
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18 portable between different platforms. Of course, they must then |
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19 only use functions that are defined by all platforms (e.g., unlink |
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20 and opendir), and leave all pathname manipulation to os.path |
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21 (e.g., split and join). |
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22 """ |
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23 |
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24 #' |
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25 |
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26 import sys, errno |
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27 |
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28 _names = sys.builtin_module_names |
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29 |
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30 # Note: more names are added to __all__ later. |
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31 __all__ = ["altsep", "curdir", "pardir", "sep", "extsep", "pathsep", "linesep", |
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32 "defpath", "name", "path", "devnull", |
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33 "SEEK_SET", "SEEK_CUR", "SEEK_END"] |
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34 |
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35 def _get_exports_list(module): |
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36 try: |
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37 return list(module.__all__) |
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38 except AttributeError: |
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39 return [n for n in dir(module) if n[0] != '_'] |
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40 |
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41 if 'posix' in _names: |
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42 name = 'posix' |
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43 linesep = '\n' |
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44 from posix import * |
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45 try: |
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46 from posix import _exit |
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47 except ImportError: |
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48 pass |
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49 import posixpath as path |
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50 |
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51 import posix |
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52 __all__.extend(_get_exports_list(posix)) |
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53 del posix |
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54 |
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55 elif 'nt' in _names: |
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56 name = 'nt' |
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57 linesep = '\r\n' |
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58 from nt import * |
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59 try: |
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60 from nt import _exit |
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61 except ImportError: |
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62 pass |
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63 import ntpath as path |
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64 |
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65 import nt |
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66 __all__.extend(_get_exports_list(nt)) |
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67 del nt |
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68 |
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69 elif 'os2' in _names: |
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70 name = 'os2' |
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71 linesep = '\r\n' |
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72 from os2 import * |
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73 try: |
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74 from os2 import _exit |
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75 except ImportError: |
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76 pass |
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77 if sys.version.find('EMX GCC') == -1: |
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78 import ntpath as path |
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79 else: |
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80 import os2emxpath as path |
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81 from _emx_link import link |
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82 |
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83 import os2 |
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84 __all__.extend(_get_exports_list(os2)) |
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85 del os2 |
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86 |
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87 elif 'ce' in _names: |
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88 name = 'ce' |
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89 linesep = '\r\n' |
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90 from ce import * |
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91 try: |
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92 from ce import _exit |
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93 except ImportError: |
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94 pass |
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95 # We can use the standard Windows path. |
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96 import ntpath as path |
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97 |
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98 import ce |
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99 __all__.extend(_get_exports_list(ce)) |
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100 del ce |
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101 |
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102 elif 'riscos' in _names: |
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103 name = 'riscos' |
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104 linesep = '\n' |
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105 from riscos import * |
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106 try: |
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107 from riscos import _exit |
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108 except ImportError: |
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109 pass |
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110 import riscospath as path |
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111 |
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112 import riscos |
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113 __all__.extend(_get_exports_list(riscos)) |
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114 del riscos |
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115 |
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116 else: |
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117 raise ImportError, 'no os specific module found' |
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118 |
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119 sys.modules['os.path'] = path |
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120 from os.path import (curdir, pardir, sep, pathsep, defpath, extsep, altsep, |
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121 devnull) |
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122 |
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123 del _names |
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124 |
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125 # Python uses fixed values for the SEEK_ constants; they are mapped |
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126 # to native constants if necessary in posixmodule.c |
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127 SEEK_SET = 0 |
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128 SEEK_CUR = 1 |
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129 SEEK_END = 2 |
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130 |
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131 #' |
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132 |
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133 # Super directory utilities. |
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134 # (Inspired by Eric Raymond; the doc strings are mostly his) |
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135 |
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136 def makedirs(name, mode=0777): |
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137 """makedirs(path [, mode=0777]) |
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138 |
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139 Super-mkdir; create a leaf directory and all intermediate ones. |
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140 Works like mkdir, except that any intermediate path segment (not |
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141 just the rightmost) will be created if it does not exist. This is |
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142 recursive. |
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143 |
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144 """ |
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145 head, tail = path.split(name) |
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146 if not tail: |
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147 head, tail = path.split(head) |
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148 if head and tail and not path.exists(head): |
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149 try: |
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150 makedirs(head, mode) |
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151 except OSError, e: |
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152 # be happy if someone already created the path |
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153 if e.errno != errno.EEXIST: |
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154 raise |
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155 if tail == curdir: # xxx/newdir/. exists if xxx/newdir exists |
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156 return |
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157 mkdir(name, mode) |
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158 |
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159 def removedirs(name): |
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160 """removedirs(path) |
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161 |
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162 Super-rmdir; remove a leaf directory and all empty intermediate |
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163 ones. Works like rmdir except that, if the leaf directory is |
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164 successfully removed, directories corresponding to rightmost path |
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165 segments will be pruned away until either the whole path is |
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166 consumed or an error occurs. Errors during this latter phase are |
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167 ignored -- they generally mean that a directory was not empty. |
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168 |
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169 """ |
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170 rmdir(name) |
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171 head, tail = path.split(name) |
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172 if not tail: |
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173 head, tail = path.split(head) |
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174 while head and tail: |
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175 try: |
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176 rmdir(head) |
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177 except error: |
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178 break |
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179 head, tail = path.split(head) |
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180 |
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181 def renames(old, new): |
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182 """renames(old, new) |
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183 |
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184 Super-rename; create directories as necessary and delete any left |
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185 empty. Works like rename, except creation of any intermediate |
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186 directories needed to make the new pathname good is attempted |
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187 first. After the rename, directories corresponding to rightmost |
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188 path segments of the old name will be pruned until either the |
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189 whole path is consumed or a nonempty directory is found. |
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190 |
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191 Note: this function can fail with the new directory structure made |
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192 if you lack permissions needed to unlink the leaf directory or |
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193 file. |
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194 |
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195 """ |
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196 head, tail = path.split(new) |
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197 if head and tail and not path.exists(head): |
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198 makedirs(head) |
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199 rename(old, new) |
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200 head, tail = path.split(old) |
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201 if head and tail: |
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202 try: |
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203 removedirs(head) |
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204 except error: |
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205 pass |
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206 |
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207 __all__.extend(["makedirs", "removedirs", "renames"]) |
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208 |
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209 def walk(top, topdown=True, onerror=None, followlinks=False): |
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210 """Directory tree generator. |
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211 |
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212 For each directory in the directory tree rooted at top (including top |
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213 itself, but excluding '.' and '..'), yields a 3-tuple |
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214 |
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215 dirpath, dirnames, filenames |
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216 |
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217 dirpath is a string, the path to the directory. dirnames is a list of |
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218 the names of the subdirectories in dirpath (excluding '.' and '..'). |
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219 filenames is a list of the names of the non-directory files in dirpath. |
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220 Note that the names in the lists are just names, with no path components. |
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221 To get a full path (which begins with top) to a file or directory in |
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222 dirpath, do os.path.join(dirpath, name). |
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223 |
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224 If optional arg 'topdown' is true or not specified, the triple for a |
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225 directory is generated before the triples for any of its subdirectories |
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226 (directories are generated top down). If topdown is false, the triple |
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227 for a directory is generated after the triples for all of its |
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228 subdirectories (directories are generated bottom up). |
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229 |
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230 When topdown is true, the caller can modify the dirnames list in-place |
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231 (e.g., via del or slice assignment), and walk will only recurse into the |
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232 subdirectories whose names remain in dirnames; this can be used to prune the |
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233 search, or to impose a specific order of visiting. Modifying dirnames when |
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234 topdown is false is ineffective, since the directories in dirnames have |
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235 already been generated by the time dirnames itself is generated. No matter |
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236 the value of topdown, the list of subdirectories is retrieved before the |
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237 tuples for the directory and its subdirectories are generated. |
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238 |
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239 By default errors from the os.listdir() call are ignored. If |
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240 optional arg 'onerror' is specified, it should be a function; it |
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241 will be called with one argument, an os.error instance. It can |
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242 report the error to continue with the walk, or raise the exception |
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243 to abort the walk. Note that the filename is available as the |
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244 filename attribute of the exception object. |
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245 |
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246 By default, os.walk does not follow symbolic links to subdirectories on |
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247 systems that support them. In order to get this functionality, set the |
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248 optional argument 'followlinks' to true. |
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249 |
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250 Caution: if you pass a relative pathname for top, don't change the |
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251 current working directory between resumptions of walk. walk never |
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252 changes the current directory, and assumes that the client doesn't |
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253 either. |
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254 |
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255 Example: |
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256 |
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257 import os |
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258 from os.path import join, getsize |
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259 for root, dirs, files in os.walk('python/Lib/email'): |
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260 print root, "consumes", |
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261 print sum([getsize(join(root, name)) for name in files]), |
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262 print "bytes in", len(files), "non-directory files" |
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263 if 'CVS' in dirs: |
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264 dirs.remove('CVS') # don't visit CVS directories |
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265 |
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266 """ |
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267 |
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268 islink, join, isdir = path.islink, path.join, path.isdir |
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269 |
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270 # We may not have read permission for top, in which case we can't |
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271 # get a list of the files the directory contains. os.path.walk |
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272 # always suppressed the exception then, rather than blow up for a |
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273 # minor reason when (say) a thousand readable directories are still |
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274 # left to visit. That logic is copied here. |
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275 try: |
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276 # Note that listdir and error are globals in this module due |
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277 # to earlier import-*. |
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278 names = listdir(top) |
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279 except error, err: |
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280 if onerror is not None: |
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281 onerror(err) |
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282 return |
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283 |
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284 dirs, nondirs = [], [] |
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285 for name in names: |
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286 if isdir(join(top, name)): |
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287 dirs.append(name) |
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288 else: |
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289 nondirs.append(name) |
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290 |
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291 if topdown: |
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292 yield top, dirs, nondirs |
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293 for name in dirs: |
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294 new_path = join(top, name) |
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295 if followlinks or not islink(new_path): |
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296 for x in walk(new_path, topdown, onerror, followlinks): |
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297 yield x |
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298 if not topdown: |
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299 yield top, dirs, nondirs |
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300 |
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301 __all__.append("walk") |
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302 |
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303 # Make sure os.environ exists, at least |
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304 try: |
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305 environ |
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306 except NameError: |
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307 environ = {} |
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308 |
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309 def execl(file, *args): |
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310 """execl(file, *args) |
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311 |
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312 Execute the executable file with argument list args, replacing the |
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313 current process. """ |
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314 execv(file, args) |
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315 |
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316 def execle(file, *args): |
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317 """execle(file, *args, env) |
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318 |
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319 Execute the executable file with argument list args and |
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320 environment env, replacing the current process. """ |
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321 env = args[-1] |
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322 execve(file, args[:-1], env) |
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323 |
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324 def execlp(file, *args): |
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325 """execlp(file, *args) |
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326 |
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327 Execute the executable file (which is searched for along $PATH) |
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328 with argument list args, replacing the current process. """ |
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329 execvp(file, args) |
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330 |
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331 def execlpe(file, *args): |
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332 """execlpe(file, *args, env) |
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333 |
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334 Execute the executable file (which is searched for along $PATH) |
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335 with argument list args and environment env, replacing the current |
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336 process. """ |
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337 env = args[-1] |
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338 execvpe(file, args[:-1], env) |
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339 |
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340 def execvp(file, args): |
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341 """execvp(file, args) |
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342 |
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343 Execute the executable file (which is searched for along $PATH) |
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344 with argument list args, replacing the current process. |
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345 args may be a list or tuple of strings. """ |
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346 _execvpe(file, args) |
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347 |
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348 def execvpe(file, args, env): |
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349 """execvpe(file, args, env) |
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350 |
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351 Execute the executable file (which is searched for along $PATH) |
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352 with argument list args and environment env , replacing the |
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353 current process. |
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354 args may be a list or tuple of strings. """ |
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355 _execvpe(file, args, env) |
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356 |
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357 __all__.extend(["execl","execle","execlp","execlpe","execvp","execvpe"]) |
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358 |
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359 def _execvpe(file, args, env=None): |
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360 if env is not None: |
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361 func = execve |
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362 argrest = (args, env) |
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363 else: |
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364 func = execv |
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365 argrest = (args,) |
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366 env = environ |
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367 |
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368 head, tail = path.split(file) |
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369 if head: |
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370 func(file, *argrest) |
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371 return |
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372 if 'PATH' in env: |
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373 envpath = env['PATH'] |
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374 else: |
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375 envpath = defpath |
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376 PATH = envpath.split(pathsep) |
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377 saved_exc = None |
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378 saved_tb = None |
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379 for dir in PATH: |
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380 fullname = path.join(dir, file) |
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381 try: |
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382 func(fullname, *argrest) |
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383 except error, e: |
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384 tb = sys.exc_info()[2] |
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385 if (e.errno != errno.ENOENT and e.errno != errno.ENOTDIR |
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386 and saved_exc is None): |
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387 saved_exc = e |
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388 saved_tb = tb |
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389 if saved_exc: |
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390 raise error, saved_exc, saved_tb |
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391 raise error, e, tb |
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392 |
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393 # Change environ to automatically call putenv() if it exists |
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394 try: |
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395 # This will fail if there's no putenv |
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396 putenv |
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397 except NameError: |
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398 pass |
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399 else: |
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400 import UserDict |
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401 |
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402 # Fake unsetenv() for Windows |
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403 # not sure about os2 here but |
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404 # I'm guessing they are the same. |
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405 |
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406 if name in ('os2', 'nt'): |
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407 def unsetenv(key): |
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408 putenv(key, "") |
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409 |
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410 if name == "riscos": |
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411 # On RISC OS, all env access goes through getenv and putenv |
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412 from riscosenviron import _Environ |
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413 elif name in ('os2', 'nt'): # Where Env Var Names Must Be UPPERCASE |
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414 # But we store them as upper case |
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415 class _Environ(UserDict.IterableUserDict): |
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416 def __init__(self, environ): |
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417 UserDict.UserDict.__init__(self) |
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418 data = self.data |
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419 for k, v in environ.items(): |
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420 data[k.upper()] = v |
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421 def __setitem__(self, key, item): |
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422 putenv(key, item) |
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423 self.data[key.upper()] = item |
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424 def __getitem__(self, key): |
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425 return self.data[key.upper()] |
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426 try: |
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427 unsetenv |
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428 except NameError: |
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429 def __delitem__(self, key): |
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430 del self.data[key.upper()] |
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431 else: |
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432 def __delitem__(self, key): |
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433 unsetenv(key) |
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434 del self.data[key.upper()] |
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435 def clear(self): |
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436 for key in self.data.keys(): |
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437 unsetenv(key) |
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438 del self.data[key] |
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439 def pop(self, key, *args): |
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440 unsetenv(key) |
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441 return self.data.pop(key.upper(), *args) |
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442 def has_key(self, key): |
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443 return key.upper() in self.data |
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444 def __contains__(self, key): |
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445 return key.upper() in self.data |
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446 def get(self, key, failobj=None): |
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447 return self.data.get(key.upper(), failobj) |
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448 def update(self, dict=None, **kwargs): |
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449 if dict: |
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450 try: |
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451 keys = dict.keys() |
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452 except AttributeError: |
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453 # List of (key, value) |
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454 for k, v in dict: |
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455 self[k] = v |
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456 else: |
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457 # got keys |
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458 # cannot use items(), since mappings |
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459 # may not have them. |
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460 for k in keys: |
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461 self[k] = dict[k] |
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462 if kwargs: |
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463 self.update(kwargs) |
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464 def copy(self): |
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465 return dict(self) |
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466 |
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467 else: # Where Env Var Names Can Be Mixed Case |
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468 class _Environ(UserDict.IterableUserDict): |
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469 def __init__(self, environ): |
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470 UserDict.UserDict.__init__(self) |
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471 self.data = environ |
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472 def __setitem__(self, key, item): |
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473 putenv(key, item) |
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474 self.data[key] = item |
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475 def update(self, dict=None, **kwargs): |
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476 if dict: |
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477 try: |
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478 keys = dict.keys() |
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479 except AttributeError: |
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480 # List of (key, value) |
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481 for k, v in dict: |
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482 self[k] = v |
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483 else: |
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484 # got keys |
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485 # cannot use items(), since mappings |
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486 # may not have them. |
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487 for k in keys: |
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488 self[k] = dict[k] |
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489 if kwargs: |
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490 self.update(kwargs) |
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491 try: |
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492 unsetenv |
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493 except NameError: |
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494 pass |
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495 else: |
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496 def __delitem__(self, key): |
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497 unsetenv(key) |
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498 del self.data[key] |
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499 def clear(self): |
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500 for key in self.data.keys(): |
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501 unsetenv(key) |
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502 del self.data[key] |
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503 def pop(self, key, *args): |
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504 unsetenv(key) |
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505 return self.data.pop(key, *args) |
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506 def copy(self): |
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507 return dict(self) |
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508 |
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509 |
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510 environ = _Environ(environ) |
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511 |
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512 def getenv(key, default=None): |
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513 """Get an environment variable, return None if it doesn't exist. |
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514 The optional second argument can specify an alternate default.""" |
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515 return environ.get(key, default) |
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516 __all__.append("getenv") |
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517 |
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518 def _exists(name): |
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519 return name in globals() |
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520 |
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521 # Supply spawn*() (probably only for Unix) |
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522 if _exists("fork") and not _exists("spawnv") and _exists("execv"): |
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523 |
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524 P_WAIT = 0 |
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525 P_NOWAIT = P_NOWAITO = 1 |
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526 |
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527 # XXX Should we support P_DETACH? I suppose it could fork()**2 |
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528 # and close the std I/O streams. Also, P_OVERLAY is the same |
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529 # as execv*()? |
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530 |
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531 def _spawnvef(mode, file, args, env, func): |
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532 # Internal helper; func is the exec*() function to use |
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533 pid = fork() |
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534 if not pid: |
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535 # Child |
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536 try: |
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537 if env is None: |
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538 func(file, args) |
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539 else: |
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540 func(file, args, env) |
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541 except: |
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542 _exit(127) |
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543 else: |
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544 # Parent |
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545 if mode == P_NOWAIT: |
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546 return pid # Caller is responsible for waiting! |
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547 while 1: |
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548 wpid, sts = waitpid(pid, 0) |
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549 if WIFSTOPPED(sts): |
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550 continue |
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551 elif WIFSIGNALED(sts): |
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552 return -WTERMSIG(sts) |
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553 elif WIFEXITED(sts): |
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554 return WEXITSTATUS(sts) |
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555 else: |
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556 raise error, "Not stopped, signaled or exited???" |
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557 |
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558 def spawnv(mode, file, args): |
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559 """spawnv(mode, file, args) -> integer |
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560 |
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561 Execute file with arguments from args in a subprocess. |
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562 If mode == P_NOWAIT return the pid of the process. |
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563 If mode == P_WAIT return the process's exit code if it exits normally; |
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564 otherwise return -SIG, where SIG is the signal that killed it. """ |
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565 return _spawnvef(mode, file, args, None, execv) |
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566 |
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567 def spawnve(mode, file, args, env): |
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568 """spawnve(mode, file, args, env) -> integer |
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569 |
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570 Execute file with arguments from args in a subprocess with the |
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571 specified environment. |
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572 If mode == P_NOWAIT return the pid of the process. |
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573 If mode == P_WAIT return the process's exit code if it exits normally; |
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574 otherwise return -SIG, where SIG is the signal that killed it. """ |
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575 return _spawnvef(mode, file, args, env, execve) |
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576 |
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577 # Note: spawnvp[e] is't currently supported on Windows |
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578 |
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579 def spawnvp(mode, file, args): |
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580 """spawnvp(mode, file, args) -> integer |
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581 |
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582 Execute file (which is looked for along $PATH) with arguments from |
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583 args in a subprocess. |
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584 If mode == P_NOWAIT return the pid of the process. |
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585 If mode == P_WAIT return the process's exit code if it exits normally; |
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586 otherwise return -SIG, where SIG is the signal that killed it. """ |
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587 return _spawnvef(mode, file, args, None, execvp) |
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588 |
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589 def spawnvpe(mode, file, args, env): |
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590 """spawnvpe(mode, file, args, env) -> integer |
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591 |
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592 Execute file (which is looked for along $PATH) with arguments from |
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593 args in a subprocess with the supplied environment. |
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594 If mode == P_NOWAIT return the pid of the process. |
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595 If mode == P_WAIT return the process's exit code if it exits normally; |
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596 otherwise return -SIG, where SIG is the signal that killed it. """ |
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597 return _spawnvef(mode, file, args, env, execvpe) |
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598 |
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599 if _exists("spawnv"): |
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600 # These aren't supplied by the basic Windows code |
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601 # but can be easily implemented in Python |
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602 |
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603 def spawnl(mode, file, *args): |
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604 """spawnl(mode, file, *args) -> integer |
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605 |
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606 Execute file with arguments from args in a subprocess. |
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607 If mode == P_NOWAIT return the pid of the process. |
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608 If mode == P_WAIT return the process's exit code if it exits normally; |
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609 otherwise return -SIG, where SIG is the signal that killed it. """ |
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610 return spawnv(mode, file, args) |
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611 |
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612 def spawnle(mode, file, *args): |
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613 """spawnle(mode, file, *args, env) -> integer |
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614 |
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615 Execute file with arguments from args in a subprocess with the |
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616 supplied environment. |
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617 If mode == P_NOWAIT return the pid of the process. |
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618 If mode == P_WAIT return the process's exit code if it exits normally; |
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619 otherwise return -SIG, where SIG is the signal that killed it. """ |
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620 env = args[-1] |
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621 return spawnve(mode, file, args[:-1], env) |
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622 |
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623 |
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624 __all__.extend(["spawnv", "spawnve", "spawnl", "spawnle",]) |
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625 |
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626 |
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627 if _exists("spawnvp"): |
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628 # At the moment, Windows doesn't implement spawnvp[e], |
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629 # so it won't have spawnlp[e] either. |
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630 def spawnlp(mode, file, *args): |
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631 """spawnlp(mode, file, *args) -> integer |
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632 |
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633 Execute file (which is looked for along $PATH) with arguments from |
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634 args in a subprocess with the supplied environment. |
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635 If mode == P_NOWAIT return the pid of the process. |
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636 If mode == P_WAIT return the process's exit code if it exits normally; |
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637 otherwise return -SIG, where SIG is the signal that killed it. """ |
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638 return spawnvp(mode, file, args) |
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639 |
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640 def spawnlpe(mode, file, *args): |
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641 """spawnlpe(mode, file, *args, env) -> integer |
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642 |
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643 Execute file (which is looked for along $PATH) with arguments from |
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644 args in a subprocess with the supplied environment. |
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645 If mode == P_NOWAIT return the pid of the process. |
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646 If mode == P_WAIT return the process's exit code if it exits normally; |
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647 otherwise return -SIG, where SIG is the signal that killed it. """ |
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648 env = args[-1] |
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649 return spawnvpe(mode, file, args[:-1], env) |
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650 |
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651 |
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652 __all__.extend(["spawnvp", "spawnvpe", "spawnlp", "spawnlpe",]) |
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653 |
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654 |
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655 # Supply popen2 etc. (for Unix) |
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656 if _exists("fork"): |
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657 if not _exists("popen2"): |
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658 def popen2(cmd, mode="t", bufsize=-1): |
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659 """Execute the shell command 'cmd' in a sub-process. On UNIX, 'cmd' |
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660 may be a sequence, in which case arguments will be passed directly to |
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661 the program without shell intervention (as with os.spawnv()). If 'cmd' |
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662 is a string it will be passed to the shell (as with os.system()). If |
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663 'bufsize' is specified, it sets the buffer size for the I/O pipes. The |
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664 file objects (child_stdin, child_stdout) are returned.""" |
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665 import warnings |
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666 msg = "os.popen2 is deprecated. Use the subprocess module." |
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667 warnings.warn(msg, DeprecationWarning, stacklevel=2) |
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668 |
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669 import subprocess |
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670 PIPE = subprocess.PIPE |
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671 p = subprocess.Popen(cmd, shell=isinstance(cmd, basestring), |
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672 bufsize=bufsize, stdin=PIPE, stdout=PIPE, |
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673 close_fds=True) |
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674 return p.stdin, p.stdout |
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675 __all__.append("popen2") |
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676 |
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677 if not _exists("popen3"): |
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678 def popen3(cmd, mode="t", bufsize=-1): |
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679 """Execute the shell command 'cmd' in a sub-process. On UNIX, 'cmd' |
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680 may be a sequence, in which case arguments will be passed directly to |
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681 the program without shell intervention (as with os.spawnv()). If 'cmd' |
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682 is a string it will be passed to the shell (as with os.system()). If |
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683 'bufsize' is specified, it sets the buffer size for the I/O pipes. The |
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684 file objects (child_stdin, child_stdout, child_stderr) are returned.""" |
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685 import warnings |
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686 msg = "os.popen3 is deprecated. Use the subprocess module." |
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687 warnings.warn(msg, DeprecationWarning, stacklevel=2) |
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688 |
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689 import subprocess |
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690 PIPE = subprocess.PIPE |
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691 p = subprocess.Popen(cmd, shell=isinstance(cmd, basestring), |
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692 bufsize=bufsize, stdin=PIPE, stdout=PIPE, |
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693 stderr=PIPE, close_fds=True) |
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694 return p.stdin, p.stdout, p.stderr |
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695 __all__.append("popen3") |
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696 |
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697 if not _exists("popen4"): |
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698 def popen4(cmd, mode="t", bufsize=-1): |
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699 """Execute the shell command 'cmd' in a sub-process. On UNIX, 'cmd' |
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700 may be a sequence, in which case arguments will be passed directly to |
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701 the program without shell intervention (as with os.spawnv()). If 'cmd' |
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702 is a string it will be passed to the shell (as with os.system()). If |
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703 'bufsize' is specified, it sets the buffer size for the I/O pipes. The |
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704 file objects (child_stdin, child_stdout_stderr) are returned.""" |
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705 import warnings |
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706 msg = "os.popen4 is deprecated. Use the subprocess module." |
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707 warnings.warn(msg, DeprecationWarning, stacklevel=2) |
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708 |
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709 import subprocess |
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710 PIPE = subprocess.PIPE |
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711 p = subprocess.Popen(cmd, shell=isinstance(cmd, basestring), |
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712 bufsize=bufsize, stdin=PIPE, stdout=PIPE, |
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713 stderr=subprocess.STDOUT, close_fds=True) |
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714 return p.stdin, p.stdout |
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715 __all__.append("popen4") |
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716 |
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717 import copy_reg as _copy_reg |
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718 |
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719 def _make_stat_result(tup, dict): |
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720 return stat_result(tup, dict) |
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721 |
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722 def _pickle_stat_result(sr): |
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723 (type, args) = sr.__reduce__() |
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724 return (_make_stat_result, args) |
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725 |
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726 try: |
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727 _copy_reg.pickle(stat_result, _pickle_stat_result, _make_stat_result) |
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728 except NameError: # stat_result may not exist |
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729 pass |
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730 |
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731 def _make_statvfs_result(tup, dict): |
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732 return statvfs_result(tup, dict) |
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733 |
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734 def _pickle_statvfs_result(sr): |
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735 (type, args) = sr.__reduce__() |
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736 return (_make_statvfs_result, args) |
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737 |
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738 try: |
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739 _copy_reg.pickle(statvfs_result, _pickle_statvfs_result, |
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740 _make_statvfs_result) |
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741 except NameError: # statvfs_result may not exist |
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742 pass |