Mercurial > hg
annotate mercurial/pure/osutil.py @ 29600:7a157639b8f2
osutil: add darwin-only version of os.listdir using cffi
author | Maciej Fijalkowski <fijall@gmail.com> |
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date | Mon, 11 Jul 2016 11:05:08 +0200 |
parents | f7d0c28d34b3 |
children | f15f31505f12 |
rev | line source |
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1 # osutil.py - pure Python version of osutil.c |
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2 # |
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3 # Copyright 2009 Matt Mackall <mpm@selenic.com> and others |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
10263 | 6 # GNU General Public License version 2 or any later version. |
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7 |
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8 from __future__ import absolute_import |
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9 |
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10 import ctypes |
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11 import ctypes.util |
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12 import os |
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13 import socket |
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14 import stat as statmod |
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15 import sys |
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16 |
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17 from . import policy |
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18 modulepolicy = policy.policy |
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19 policynocffi = policy.policynocffi |
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20 |
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21 def _mode_to_kind(mode): |
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22 if statmod.S_ISREG(mode): |
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23 return statmod.S_IFREG |
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24 if statmod.S_ISDIR(mode): |
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25 return statmod.S_IFDIR |
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26 if statmod.S_ISLNK(mode): |
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27 return statmod.S_IFLNK |
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28 if statmod.S_ISBLK(mode): |
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29 return statmod.S_IFBLK |
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30 if statmod.S_ISCHR(mode): |
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31 return statmod.S_IFCHR |
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32 if statmod.S_ISFIFO(mode): |
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33 return statmod.S_IFIFO |
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34 if statmod.S_ISSOCK(mode): |
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35 return statmod.S_IFSOCK |
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36 return mode |
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37 |
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38 def listdirpure(path, stat=False, skip=None): |
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39 '''listdir(path, stat=False) -> list_of_tuples |
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40 |
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41 Return a sorted list containing information about the entries |
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42 in the directory. |
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43 |
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44 If stat is True, each element is a 3-tuple: |
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45 |
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46 (name, type, stat object) |
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47 |
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48 Otherwise, each element is a 2-tuple: |
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49 |
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50 (name, type) |
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51 ''' |
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52 result = [] |
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53 prefix = path |
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54 if not prefix.endswith(os.sep): |
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55 prefix += os.sep |
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56 names = os.listdir(path) |
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57 names.sort() |
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58 for fn in names: |
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59 st = os.lstat(prefix + fn) |
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60 if fn == skip and statmod.S_ISDIR(st.st_mode): |
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61 return [] |
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62 if stat: |
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63 result.append((fn, _mode_to_kind(st.st_mode), st)) |
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64 else: |
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65 result.append((fn, _mode_to_kind(st.st_mode))) |
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66 return result |
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67 |
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68 ffi = None |
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69 if modulepolicy not in policynocffi and sys.platform == 'darwin': |
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70 try: |
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71 from _osutil_cffi import ffi, lib |
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72 except ImportError: |
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73 if modulepolicy == 'cffi': # strict cffi import |
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74 raise |
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75 |
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76 if sys.platform == 'darwin' and ffi is not None: |
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77 listdir_batch_size = 4096 |
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78 # tweakable number, only affects performance, which chunks |
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79 # of bytes do we get back from getattrlistbulk |
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80 |
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81 attrkinds = [None] * 20 # we need the max no for enum VXXX, 20 is plenty |
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82 |
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83 attrkinds[lib.VREG] = statmod.S_IFREG |
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84 attrkinds[lib.VDIR] = statmod.S_IFDIR |
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85 attrkinds[lib.VLNK] = statmod.S_IFLNK |
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86 attrkinds[lib.VBLK] = statmod.S_IFBLK |
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87 attrkinds[lib.VCHR] = statmod.S_IFCHR |
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88 attrkinds[lib.VFIFO] = statmod.S_IFIFO |
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89 attrkinds[lib.VSOCK] = statmod.S_IFSOCK |
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90 |
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91 class stat_res(object): |
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92 def __init__(self, st_mode, st_mtime, st_size): |
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93 self.st_mode = st_mode |
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94 self.st_mtime = st_mtime |
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95 self.st_size = st_size |
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96 |
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97 tv_sec_ofs = ffi.offsetof("struct timespec", "tv_sec") |
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98 buf = ffi.new("char[]", listdir_batch_size) |
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99 |
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100 def listdirinternal(dfd, req, stat, skip): |
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101 ret = [] |
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102 while True: |
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103 r = lib.getattrlistbulk(dfd, req, buf, listdir_batch_size, 0) |
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104 if r == 0: |
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105 break |
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106 if r == -1: |
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107 raise OSError(ffi.errno, os.strerror(ffi.errno)) |
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108 cur = ffi.cast("val_attrs_t*", buf) |
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109 for i in range(r): |
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110 lgt = cur.length |
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111 assert lgt == ffi.cast('uint32_t*', cur)[0] |
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112 ofs = cur.name_info.attr_dataoffset |
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113 str_lgt = cur.name_info.attr_length |
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114 base_ofs = ffi.offsetof('val_attrs_t', 'name_info') |
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115 name = str(ffi.buffer(ffi.cast("char*", cur) + base_ofs + ofs, |
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116 str_lgt - 1)) |
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117 tp = attrkinds[cur.obj_type] |
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118 if name == "." or name == "..": |
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119 continue |
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120 if skip == name and tp == statmod.S_ISDIR: |
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121 return [] |
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122 if stat: |
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123 mtime = cur.time.tv_sec |
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124 mode = (cur.accessmask & ~lib.S_IFMT)| tp |
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125 ret.append((name, tp, stat_res(st_mode=mode, st_mtime=mtime, |
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126 st_size=cur.datalength))) |
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127 else: |
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128 ret.append((name, tp)) |
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129 cur += lgt |
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130 return ret |
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131 |
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132 def listdir(path, stat=False, skip=None): |
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133 req = ffi.new("struct attrlist*") |
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134 req.bitmapcount = lib.ATTR_BIT_MAP_COUNT |
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135 req.commonattr = (lib.ATTR_CMN_RETURNED_ATTRS | |
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136 lib.ATTR_CMN_NAME | |
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137 lib.ATTR_CMN_OBJTYPE | |
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138 lib.ATTR_CMN_ACCESSMASK | |
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139 lib.ATTR_CMN_MODTIME) |
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140 req.fileattr = lib.ATTR_FILE_DATALENGTH |
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141 dfd = lib.open(path, lib.O_RDONLY, 0) |
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142 if dfd == -1: |
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143 raise OSError(ffi.errno, os.strerror(ffi.errno)) |
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144 |
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145 try: |
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146 ret = listdirinternal(dfd, req, stat, skip) |
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147 finally: |
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148 try: |
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149 lib.close(dfd) |
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150 except BaseException: |
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151 pass # we ignore all the errors from closing, not |
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152 # much we can do about that |
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153 return ret |
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154 else: |
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155 listdir = listdirpure |
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156 |
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157 if os.name != 'nt': |
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158 posixfile = open |
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159 |
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160 _SCM_RIGHTS = 0x01 |
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161 _socklen_t = ctypes.c_uint |
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162 |
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163 if sys.platform == 'linux2': |
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164 # socket.h says "the type should be socklen_t but the definition of |
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165 # the kernel is incompatible with this." |
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166 _cmsg_len_t = ctypes.c_size_t |
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167 _msg_controllen_t = ctypes.c_size_t |
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168 _msg_iovlen_t = ctypes.c_size_t |
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169 else: |
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170 _cmsg_len_t = _socklen_t |
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171 _msg_controllen_t = _socklen_t |
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172 _msg_iovlen_t = ctypes.c_int |
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173 |
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174 class _iovec(ctypes.Structure): |
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175 _fields_ = [ |
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176 ('iov_base', ctypes.c_void_p), |
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177 ('iov_len', ctypes.c_size_t), |
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178 ] |
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179 |
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180 class _msghdr(ctypes.Structure): |
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181 _fields_ = [ |
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182 ('msg_name', ctypes.c_void_p), |
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183 ('msg_namelen', _socklen_t), |
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184 ('msg_iov', ctypes.POINTER(_iovec)), |
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185 ('msg_iovlen', _msg_iovlen_t), |
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186 ('msg_control', ctypes.c_void_p), |
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187 ('msg_controllen', _msg_controllen_t), |
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188 ('msg_flags', ctypes.c_int), |
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189 ] |
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190 |
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191 class _cmsghdr(ctypes.Structure): |
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192 _fields_ = [ |
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193 ('cmsg_len', _cmsg_len_t), |
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194 ('cmsg_level', ctypes.c_int), |
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195 ('cmsg_type', ctypes.c_int), |
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196 ('cmsg_data', ctypes.c_ubyte * 0), |
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197 ] |
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198 |
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199 _libc = ctypes.CDLL(ctypes.util.find_library('c'), use_errno=True) |
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200 _recvmsg = getattr(_libc, 'recvmsg', None) |
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201 if _recvmsg: |
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202 _recvmsg.restype = getattr(ctypes, 'c_ssize_t', ctypes.c_long) |
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203 _recvmsg.argtypes = (ctypes.c_int, ctypes.POINTER(_msghdr), |
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204 ctypes.c_int) |
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205 else: |
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206 # recvmsg isn't always provided by libc; such systems are unsupported |
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207 def _recvmsg(sockfd, msg, flags): |
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208 raise NotImplementedError('unsupported platform') |
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209 |
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210 def _CMSG_FIRSTHDR(msgh): |
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211 if msgh.msg_controllen < ctypes.sizeof(_cmsghdr): |
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212 return |
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213 cmsgptr = ctypes.cast(msgh.msg_control, ctypes.POINTER(_cmsghdr)) |
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214 return cmsgptr.contents |
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215 |
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216 # The pure version is less portable than the native version because the |
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217 # handling of socket ancillary data heavily depends on C preprocessor. |
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218 # Also, some length fields are wrongly typed in Linux kernel. |
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219 def recvfds(sockfd): |
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220 """receive list of file descriptors via socket""" |
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221 dummy = (ctypes.c_ubyte * 1)() |
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222 iov = _iovec(ctypes.cast(dummy, ctypes.c_void_p), ctypes.sizeof(dummy)) |
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223 cbuf = ctypes.create_string_buffer(256) |
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224 msgh = _msghdr(None, 0, |
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225 ctypes.pointer(iov), 1, |
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226 ctypes.cast(cbuf, ctypes.c_void_p), ctypes.sizeof(cbuf), |
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227 0) |
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228 r = _recvmsg(sockfd, ctypes.byref(msgh), 0) |
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229 if r < 0: |
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230 e = ctypes.get_errno() |
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231 raise OSError(e, os.strerror(e)) |
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232 # assumes that the first cmsg has fds because it isn't easy to write |
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233 # portable CMSG_NXTHDR() with ctypes. |
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234 cmsg = _CMSG_FIRSTHDR(msgh) |
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235 if not cmsg: |
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236 return [] |
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237 if (cmsg.cmsg_level != socket.SOL_SOCKET or |
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238 cmsg.cmsg_type != _SCM_RIGHTS): |
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239 return [] |
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240 rfds = ctypes.cast(cmsg.cmsg_data, ctypes.POINTER(ctypes.c_int)) |
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241 rfdscount = ((cmsg.cmsg_len - _cmsghdr.cmsg_data.offset) / |
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242 ctypes.sizeof(ctypes.c_int)) |
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243 return [rfds[i] for i in xrange(rfdscount)] |
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244 |
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245 else: |
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246 import msvcrt |
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247 |
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248 _kernel32 = ctypes.windll.kernel32 |
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249 |
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250 _DWORD = ctypes.c_ulong |
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251 _LPCSTR = _LPSTR = ctypes.c_char_p |
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252 _HANDLE = ctypes.c_void_p |
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253 |
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254 _INVALID_HANDLE_VALUE = _HANDLE(-1).value |
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255 |
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256 # CreateFile |
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257 _FILE_SHARE_READ = 0x00000001 |
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258 _FILE_SHARE_WRITE = 0x00000002 |
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259 _FILE_SHARE_DELETE = 0x00000004 |
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260 |
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261 _CREATE_ALWAYS = 2 |
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262 _OPEN_EXISTING = 3 |
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263 _OPEN_ALWAYS = 4 |
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264 |
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265 _GENERIC_READ = 0x80000000 |
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266 _GENERIC_WRITE = 0x40000000 |
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267 |
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268 _FILE_ATTRIBUTE_NORMAL = 0x80 |
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269 |
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270 # open_osfhandle flags |
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271 _O_RDONLY = 0x0000 |
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272 _O_RDWR = 0x0002 |
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273 _O_APPEND = 0x0008 |
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274 |
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275 _O_TEXT = 0x4000 |
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276 _O_BINARY = 0x8000 |
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277 |
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278 # types of parameters of C functions used (required by pypy) |
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279 |
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280 _kernel32.CreateFileA.argtypes = [_LPCSTR, _DWORD, _DWORD, ctypes.c_void_p, |
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281 _DWORD, _DWORD, _HANDLE] |
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282 _kernel32.CreateFileA.restype = _HANDLE |
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283 |
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284 def _raiseioerror(name): |
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285 err = ctypes.WinError() |
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286 raise IOError(err.errno, '%s: %s' % (name, err.strerror)) |
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287 |
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288 class posixfile(object): |
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289 '''a file object aiming for POSIX-like semantics |
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290 |
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291 CPython's open() returns a file that was opened *without* setting the |
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292 _FILE_SHARE_DELETE flag, which causes rename and unlink to abort. |
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293 This even happens if any hardlinked copy of the file is in open state. |
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294 We set _FILE_SHARE_DELETE here, so files opened with posixfile can be |
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295 renamed and deleted while they are held open. |
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296 Note that if a file opened with posixfile is unlinked, the file |
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297 remains but cannot be opened again or be recreated under the same name, |
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298 until all reading processes have closed the file.''' |
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299 |
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300 def __init__(self, name, mode='r', bufsize=-1): |
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301 if 'b' in mode: |
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302 flags = _O_BINARY |
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303 else: |
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304 flags = _O_TEXT |
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305 |
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306 m0 = mode[0] |
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307 if m0 == 'r' and '+' not in mode: |
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308 flags |= _O_RDONLY |
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309 access = _GENERIC_READ |
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310 else: |
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311 # work around http://support.microsoft.com/kb/899149 and |
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312 # set _O_RDWR for 'w' and 'a', even if mode has no '+' |
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313 flags |= _O_RDWR |
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314 access = _GENERIC_READ | _GENERIC_WRITE |
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315 |
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316 if m0 == 'r': |
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317 creation = _OPEN_EXISTING |
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318 elif m0 == 'w': |
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319 creation = _CREATE_ALWAYS |
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320 elif m0 == 'a': |
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321 creation = _OPEN_ALWAYS |
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322 flags |= _O_APPEND |
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323 else: |
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324 raise ValueError("invalid mode: %s" % mode) |
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325 |
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326 fh = _kernel32.CreateFileA(name, access, |
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327 _FILE_SHARE_READ | _FILE_SHARE_WRITE | _FILE_SHARE_DELETE, |
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328 None, creation, _FILE_ATTRIBUTE_NORMAL, None) |
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329 if fh == _INVALID_HANDLE_VALUE: |
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330 _raiseioerror(name) |
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331 |
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332 fd = msvcrt.open_osfhandle(fh, flags) |
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333 if fd == -1: |
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334 _kernel32.CloseHandle(fh) |
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335 _raiseioerror(name) |
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336 |
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337 f = os.fdopen(fd, mode, bufsize) |
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338 # unfortunately, f.name is '<fdopen>' at this point -- so we store |
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339 # the name on this wrapper. We cannot just assign to f.name, |
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340 # because that attribute is read-only. |
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341 object.__setattr__(self, 'name', name) |
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342 object.__setattr__(self, '_file', f) |
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343 |
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344 def __iter__(self): |
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345 return self._file |
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346 |
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347 def __getattr__(self, name): |
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348 return getattr(self._file, name) |
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349 |
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350 def __setattr__(self, name, value): |
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351 '''mimics the read-only attributes of Python file objects |
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352 by raising 'TypeError: readonly attribute' if someone tries: |
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353 f = posixfile('foo.txt') |
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354 f.name = 'bla' ''' |
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355 return self._file.__setattr__(name, value) |
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356 |
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357 def __enter__(self): |
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358 return self._file.__enter__() |
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359 |
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360 def __exit__(self, exc_type, exc_value, exc_tb): |
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361 return self._file.__exit__(exc_type, exc_value, exc_tb) |