author | Yuya Nishihara <yuya@tcha.org> |
Thu, 03 May 2018 18:15:43 +0900 | |
changeset 37974 | b45f4c1532c0 |
parent 34645 | 75979c8d4572 |
child 38783 | e7aa113b14f7 |
permissions | -rw-r--r-- |
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# osutil.py - pure Python version of osutil.c |
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# |
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# Copyright 2009 Matt Mackall <mpm@selenic.com> and others |
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# |
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# This software may be used and distributed according to the terms of the |
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# GNU General Public License version 2 or any later version. |
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from __future__ import absolute_import |
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import ctypes |
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import ctypes.util |
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import os |
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import socket |
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import stat as statmod |
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from .. import ( |
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pycompat, |
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) |
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def _mode_to_kind(mode): |
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if statmod.S_ISREG(mode): |
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return statmod.S_IFREG |
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if statmod.S_ISDIR(mode): |
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return statmod.S_IFDIR |
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if statmod.S_ISLNK(mode): |
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return statmod.S_IFLNK |
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if statmod.S_ISBLK(mode): |
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return statmod.S_IFBLK |
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if statmod.S_ISCHR(mode): |
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return statmod.S_IFCHR |
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if statmod.S_ISFIFO(mode): |
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return statmod.S_IFIFO |
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if statmod.S_ISSOCK(mode): |
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return statmod.S_IFSOCK |
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return mode |
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def listdir(path, stat=False, skip=None): |
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'''listdir(path, stat=False) -> list_of_tuples |
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Return a sorted list containing information about the entries |
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in the directory. |
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If stat is True, each element is a 3-tuple: |
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(name, type, stat object) |
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Otherwise, each element is a 2-tuple: |
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(name, type) |
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''' |
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result = [] |
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prefix = path |
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if not prefix.endswith(pycompat.ossep): |
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prefix += pycompat.ossep |
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names = os.listdir(path) |
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names.sort() |
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for fn in names: |
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st = os.lstat(prefix + fn) |
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if fn == skip and statmod.S_ISDIR(st.st_mode): |
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return [] |
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if stat: |
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result.append((fn, _mode_to_kind(st.st_mode), st)) |
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else: |
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result.append((fn, _mode_to_kind(st.st_mode))) |
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return result |
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if not pycompat.iswindows: |
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posixfile = open |
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_SCM_RIGHTS = 0x01 |
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_socklen_t = ctypes.c_uint |
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if pycompat.sysplatform.startswith('linux'): |
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# socket.h says "the type should be socklen_t but the definition of |
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# the kernel is incompatible with this." |
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_cmsg_len_t = ctypes.c_size_t |
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_msg_controllen_t = ctypes.c_size_t |
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_msg_iovlen_t = ctypes.c_size_t |
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else: |
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_cmsg_len_t = _socklen_t |
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_msg_controllen_t = _socklen_t |
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_msg_iovlen_t = ctypes.c_int |
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class _iovec(ctypes.Structure): |
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_fields_ = [ |
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(u'iov_base', ctypes.c_void_p), |
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(u'iov_len', ctypes.c_size_t), |
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] |
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class _msghdr(ctypes.Structure): |
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_fields_ = [ |
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(u'msg_name', ctypes.c_void_p), |
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(u'msg_namelen', _socklen_t), |
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(u'msg_iov', ctypes.POINTER(_iovec)), |
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(u'msg_iovlen', _msg_iovlen_t), |
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(u'msg_control', ctypes.c_void_p), |
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(u'msg_controllen', _msg_controllen_t), |
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(u'msg_flags', ctypes.c_int), |
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] |
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class _cmsghdr(ctypes.Structure): |
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_fields_ = [ |
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(u'cmsg_len', _cmsg_len_t), |
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(u'cmsg_level', ctypes.c_int), |
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(u'cmsg_type', ctypes.c_int), |
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(u'cmsg_data', ctypes.c_ubyte * 0), |
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107 |
] |
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108 |
|
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109 |
_libc = ctypes.CDLL(ctypes.util.find_library(u'c'), use_errno=True) |
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110 |
_recvmsg = getattr(_libc, 'recvmsg', None) |
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111 |
if _recvmsg: |
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112 |
_recvmsg.restype = getattr(ctypes, 'c_ssize_t', ctypes.c_long) |
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113 |
_recvmsg.argtypes = (ctypes.c_int, ctypes.POINTER(_msghdr), |
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114 |
ctypes.c_int) |
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115 |
else: |
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116 |
# recvmsg isn't always provided by libc; such systems are unsupported |
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117 |
def _recvmsg(sockfd, msg, flags): |
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118 |
raise NotImplementedError('unsupported platform') |
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119 |
|
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120 |
def _CMSG_FIRSTHDR(msgh): |
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121 |
if msgh.msg_controllen < ctypes.sizeof(_cmsghdr): |
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122 |
return |
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123 |
cmsgptr = ctypes.cast(msgh.msg_control, ctypes.POINTER(_cmsghdr)) |
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124 |
return cmsgptr.contents |
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125 |
|
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126 |
# The pure version is less portable than the native version because the |
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127 |
# handling of socket ancillary data heavily depends on C preprocessor. |
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128 |
# Also, some length fields are wrongly typed in Linux kernel. |
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129 |
def recvfds(sockfd): |
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130 |
"""receive list of file descriptors via socket""" |
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131 |
dummy = (ctypes.c_ubyte * 1)() |
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132 |
iov = _iovec(ctypes.cast(dummy, ctypes.c_void_p), ctypes.sizeof(dummy)) |
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133 |
cbuf = ctypes.create_string_buffer(256) |
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134 |
msgh = _msghdr(None, 0, |
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135 |
ctypes.pointer(iov), 1, |
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136 |
ctypes.cast(cbuf, ctypes.c_void_p), ctypes.sizeof(cbuf), |
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137 |
0) |
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138 |
r = _recvmsg(sockfd, ctypes.byref(msgh), 0) |
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139 |
if r < 0: |
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140 |
e = ctypes.get_errno() |
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141 |
raise OSError(e, os.strerror(e)) |
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142 |
# assumes that the first cmsg has fds because it isn't easy to write |
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143 |
# portable CMSG_NXTHDR() with ctypes. |
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144 |
cmsg = _CMSG_FIRSTHDR(msgh) |
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145 |
if not cmsg: |
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146 |
return [] |
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147 |
if (cmsg.cmsg_level != socket.SOL_SOCKET or |
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148 |
cmsg.cmsg_type != _SCM_RIGHTS): |
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149 |
return [] |
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150 |
rfds = ctypes.cast(cmsg.cmsg_data, ctypes.POINTER(ctypes.c_int)) |
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151 |
rfdscount = ((cmsg.cmsg_len - _cmsghdr.cmsg_data.offset) / |
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152 |
ctypes.sizeof(ctypes.c_int)) |
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153 |
return [rfds[i] for i in xrange(rfdscount)] |
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154 |
|
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155 |
else: |
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156 |
import msvcrt |
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157 |
|
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158 |
_kernel32 = ctypes.windll.kernel32 |
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159 |
|
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160 |
_DWORD = ctypes.c_ulong |
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161 |
_LPCSTR = _LPSTR = ctypes.c_char_p |
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162 |
_HANDLE = ctypes.c_void_p |
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163 |
|
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164 |
_INVALID_HANDLE_VALUE = _HANDLE(-1).value |
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165 |
|
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166 |
# CreateFile |
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167 |
_FILE_SHARE_READ = 0x00000001 |
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168 |
_FILE_SHARE_WRITE = 0x00000002 |
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169 |
_FILE_SHARE_DELETE = 0x00000004 |
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170 |
|
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171 |
_CREATE_ALWAYS = 2 |
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172 |
_OPEN_EXISTING = 3 |
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173 |
_OPEN_ALWAYS = 4 |
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174 |
|
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175 |
_GENERIC_READ = 0x80000000 |
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176 |
_GENERIC_WRITE = 0x40000000 |
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177 |
|
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178 |
_FILE_ATTRIBUTE_NORMAL = 0x80 |
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179 |
|
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180 |
# open_osfhandle flags |
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181 |
_O_RDONLY = 0x0000 |
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182 |
_O_RDWR = 0x0002 |
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183 |
_O_APPEND = 0x0008 |
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184 |
|
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185 |
_O_TEXT = 0x4000 |
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186 |
_O_BINARY = 0x8000 |
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187 |
|
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188 |
# types of parameters of C functions used (required by pypy) |
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189 |
|
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190 |
_kernel32.CreateFileA.argtypes = [_LPCSTR, _DWORD, _DWORD, ctypes.c_void_p, |
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191 |
_DWORD, _DWORD, _HANDLE] |
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192 |
_kernel32.CreateFileA.restype = _HANDLE |
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193 |
|
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194 |
def _raiseioerror(name): |
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err = ctypes.WinError() |
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raise IOError(err.errno, '%s: %s' % (name, err.strerror)) |
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197 |
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198 |
class posixfile(object): |
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'''a file object aiming for POSIX-like semantics |
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200 |
|
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201 |
CPython's open() returns a file that was opened *without* setting the |
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202 |
_FILE_SHARE_DELETE flag, which causes rename and unlink to abort. |
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203 |
This even happens if any hardlinked copy of the file is in open state. |
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204 |
We set _FILE_SHARE_DELETE here, so files opened with posixfile can be |
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205 |
renamed and deleted while they are held open. |
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206 |
Note that if a file opened with posixfile is unlinked, the file |
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207 |
remains but cannot be opened again or be recreated under the same name, |
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208 |
until all reading processes have closed the file.''' |
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209 |
|
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210 |
def __init__(self, name, mode='r', bufsize=-1): |
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if 'b' in mode: |
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flags = _O_BINARY |
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213 |
else: |
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flags = _O_TEXT |
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215 |
|
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m0 = mode[0] |
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if m0 == 'r' and '+' not in mode: |
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flags |= _O_RDONLY |
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access = _GENERIC_READ |
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else: |
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# work around http://support.microsoft.com/kb/899149 and |
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# set _O_RDWR for 'w' and 'a', even if mode has no '+' |
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flags |= _O_RDWR |
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access = _GENERIC_READ | _GENERIC_WRITE |
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225 |
|
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if m0 == 'r': |
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creation = _OPEN_EXISTING |
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elif m0 == 'w': |
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creation = _CREATE_ALWAYS |
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elif m0 == 'a': |
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creation = _OPEN_ALWAYS |
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flags |= _O_APPEND |
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233 |
else: |
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raise ValueError("invalid mode: %s" % mode) |
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|
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fh = _kernel32.CreateFileA(name, access, |
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_FILE_SHARE_READ | _FILE_SHARE_WRITE | _FILE_SHARE_DELETE, |
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None, creation, _FILE_ATTRIBUTE_NORMAL, None) |
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if fh == _INVALID_HANDLE_VALUE: |
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_raiseioerror(name) |
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|
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fd = msvcrt.open_osfhandle(fh, flags) |
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if fd == -1: |
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_kernel32.CloseHandle(fh) |
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_raiseioerror(name) |
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|
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f = os.fdopen(fd, pycompat.sysstr(mode), bufsize) |
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# unfortunately, f.name is '<fdopen>' at this point -- so we store |
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# the name on this wrapper. We cannot just assign to f.name, |
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# because that attribute is read-only. |
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object.__setattr__(self, r'name', name) |
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object.__setattr__(self, r'_file', f) |
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|
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def __iter__(self): |
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return self._file |
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256 |
|
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def __getattr__(self, name): |
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return getattr(self._file, name) |
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|
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def __setattr__(self, name, value): |
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'''mimics the read-only attributes of Python file objects |
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by raising 'TypeError: readonly attribute' if someone tries: |
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f = posixfile('foo.txt') |
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f.name = 'bla' ''' |
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return self._file.__setattr__(name, value) |
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|
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def __enter__(self): |
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return self._file.__enter__() |
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|
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def __exit__(self, exc_type, exc_value, exc_tb): |
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return self._file.__exit__(exc_type, exc_value, exc_tb) |