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@@ -1,173 +1,256 b'' | |||
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1 | 1 | # osutil.py - pure Python version of osutil.c |
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2 | 2 | # |
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3 | 3 | # Copyright 2009 Matt Mackall <mpm@selenic.com> and others |
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4 | 4 | # |
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5 | 5 | # This software may be used and distributed according to the terms of the |
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6 | 6 | # GNU General Public License version 2 or any later version. |
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7 | 7 | |
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8 | 8 | from __future__ import absolute_import |
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9 | 9 | |
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10 | import ctypes | |
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11 | import ctypes.util | |
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10 | 12 | import os |
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13 | import socket | |
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11 | 14 | import stat as statmod |
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15 | import sys | |
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12 | 16 | |
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13 | 17 | def _mode_to_kind(mode): |
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14 | 18 | if statmod.S_ISREG(mode): |
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15 | 19 | return statmod.S_IFREG |
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16 | 20 | if statmod.S_ISDIR(mode): |
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17 | 21 | return statmod.S_IFDIR |
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18 | 22 | if statmod.S_ISLNK(mode): |
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19 | 23 | return statmod.S_IFLNK |
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20 | 24 | if statmod.S_ISBLK(mode): |
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21 | 25 | return statmod.S_IFBLK |
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22 | 26 | if statmod.S_ISCHR(mode): |
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23 | 27 | return statmod.S_IFCHR |
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24 | 28 | if statmod.S_ISFIFO(mode): |
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25 | 29 | return statmod.S_IFIFO |
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26 | 30 | if statmod.S_ISSOCK(mode): |
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27 | 31 | return statmod.S_IFSOCK |
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28 | 32 | return mode |
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29 | 33 | |
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30 | 34 | def listdir(path, stat=False, skip=None): |
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31 | 35 | '''listdir(path, stat=False) -> list_of_tuples |
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32 | 36 | |
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33 | 37 | Return a sorted list containing information about the entries |
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34 | 38 | in the directory. |
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35 | 39 | |
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36 | 40 | If stat is True, each element is a 3-tuple: |
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37 | 41 | |
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38 | 42 | (name, type, stat object) |
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39 | 43 | |
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40 | 44 | Otherwise, each element is a 2-tuple: |
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41 | 45 | |
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42 | 46 | (name, type) |
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43 | 47 | ''' |
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44 | 48 | result = [] |
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45 | 49 | prefix = path |
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46 | 50 | if not prefix.endswith(os.sep): |
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47 | 51 | prefix += os.sep |
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48 | 52 | names = os.listdir(path) |
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49 | 53 | names.sort() |
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50 | 54 | for fn in names: |
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51 | 55 | st = os.lstat(prefix + fn) |
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52 | 56 | if fn == skip and statmod.S_ISDIR(st.st_mode): |
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53 | 57 | return [] |
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54 | 58 | if stat: |
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55 | 59 | result.append((fn, _mode_to_kind(st.st_mode), st)) |
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56 | 60 | else: |
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57 | 61 | result.append((fn, _mode_to_kind(st.st_mode))) |
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58 | 62 | return result |
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59 | 63 | |
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60 | 64 | if os.name != 'nt': |
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61 | 65 | posixfile = open |
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66 | ||
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67 | _SCM_RIGHTS = 0x01 | |
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68 | _socklen_t = ctypes.c_uint | |
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69 | ||
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70 | if sys.platform == 'linux2': | |
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71 | # socket.h says "the type should be socklen_t but the definition of | |
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72 | # the kernel is incompatible with this." | |
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73 | _cmsg_len_t = ctypes.c_size_t | |
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74 | _msg_controllen_t = ctypes.c_size_t | |
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75 | _msg_iovlen_t = ctypes.c_size_t | |
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62 | 76 | else: |
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63 | import ctypes | |
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77 | _cmsg_len_t = _socklen_t | |
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78 | _msg_controllen_t = _socklen_t | |
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79 | _msg_iovlen_t = ctypes.c_int | |
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80 | ||
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81 | class _iovec(ctypes.Structure): | |
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82 | _fields_ = [ | |
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83 | ('iov_base', ctypes.c_void_p), | |
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84 | ('iov_len', ctypes.c_size_t), | |
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85 | ] | |
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86 | ||
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87 | class _msghdr(ctypes.Structure): | |
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88 | _fields_ = [ | |
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89 | ('msg_name', ctypes.c_void_p), | |
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90 | ('msg_namelen', _socklen_t), | |
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91 | ('msg_iov', ctypes.POINTER(_iovec)), | |
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92 | ('msg_iovlen', _msg_iovlen_t), | |
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93 | ('msg_control', ctypes.c_void_p), | |
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94 | ('msg_controllen', _msg_controllen_t), | |
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95 | ('msg_flags', ctypes.c_int), | |
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96 | ] | |
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97 | ||
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98 | class _cmsghdr(ctypes.Structure): | |
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99 | _fields_ = [ | |
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100 | ('cmsg_len', _cmsg_len_t), | |
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101 | ('cmsg_level', ctypes.c_int), | |
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102 | ('cmsg_type', ctypes.c_int), | |
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103 | ('cmsg_data', ctypes.c_ubyte * 0), | |
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104 | ] | |
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105 | ||
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106 | _libc = ctypes.CDLL(ctypes.util.find_library('c'), use_errno=True) | |
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107 | _recvmsg = _libc.recvmsg | |
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108 | _recvmsg.restype = ctypes.c_ssize_t | |
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109 | _recvmsg.argtypes = (ctypes.c_int, ctypes.POINTER(_msghdr), ctypes.c_int) | |
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110 | ||
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111 | def _CMSG_FIRSTHDR(msgh): | |
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112 | if msgh.msg_controllen < ctypes.sizeof(_cmsghdr): | |
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113 | return | |
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114 | cmsgptr = ctypes.cast(msgh.msg_control, ctypes.POINTER(_cmsghdr)) | |
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115 | return cmsgptr.contents | |
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116 | ||
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117 | # The pure version is less portable than the native version because the | |
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118 | # handling of socket ancillary data heavily depends on C preprocessor. | |
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119 | # Also, some length fields are wrongly typed in Linux kernel. | |
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120 | def recvfds(sockfd): | |
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121 | """receive list of file descriptors via socket""" | |
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122 | dummy = (ctypes.c_ubyte * 1)() | |
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123 | iov = _iovec(ctypes.cast(dummy, ctypes.c_void_p), ctypes.sizeof(dummy)) | |
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124 | cbuf = ctypes.create_string_buffer(256) | |
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125 | msgh = _msghdr(None, 0, | |
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126 | ctypes.pointer(iov), 1, | |
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127 | ctypes.cast(cbuf, ctypes.c_void_p), ctypes.sizeof(cbuf), | |
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128 | 0) | |
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129 | r = _recvmsg(sockfd, ctypes.byref(msgh), 0) | |
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130 | if r < 0: | |
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131 | e = ctypes.get_errno() | |
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132 | raise OSError(e, os.strerror(e)) | |
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133 | # assumes that the first cmsg has fds because it isn't easy to write | |
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134 | # portable CMSG_NXTHDR() with ctypes. | |
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135 | cmsg = _CMSG_FIRSTHDR(msgh) | |
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136 | if not cmsg: | |
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137 | return [] | |
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138 | if (cmsg.cmsg_level != socket.SOL_SOCKET or | |
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139 | cmsg.cmsg_type != _SCM_RIGHTS): | |
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140 | return [] | |
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141 | rfds = ctypes.cast(cmsg.cmsg_data, ctypes.POINTER(ctypes.c_int)) | |
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142 | rfdscount = ((cmsg.cmsg_len - _cmsghdr.cmsg_data.offset) / | |
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143 | ctypes.sizeof(ctypes.c_int)) | |
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144 | return [rfds[i] for i in xrange(rfdscount)] | |
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145 | ||
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146 | else: | |
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64 | 147 | import msvcrt |
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65 | 148 | |
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66 | 149 | _kernel32 = ctypes.windll.kernel32 |
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67 | 150 | |
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68 | 151 | _DWORD = ctypes.c_ulong |
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69 | 152 | _LPCSTR = _LPSTR = ctypes.c_char_p |
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70 | 153 | _HANDLE = ctypes.c_void_p |
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71 | 154 | |
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72 | 155 | _INVALID_HANDLE_VALUE = _HANDLE(-1).value |
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73 | 156 | |
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74 | 157 | # CreateFile |
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75 | 158 | _FILE_SHARE_READ = 0x00000001 |
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76 | 159 | _FILE_SHARE_WRITE = 0x00000002 |
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77 | 160 | _FILE_SHARE_DELETE = 0x00000004 |
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78 | 161 | |
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79 | 162 | _CREATE_ALWAYS = 2 |
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80 | 163 | _OPEN_EXISTING = 3 |
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81 | 164 | _OPEN_ALWAYS = 4 |
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82 | 165 | |
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83 | 166 | _GENERIC_READ = 0x80000000 |
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84 | 167 | _GENERIC_WRITE = 0x40000000 |
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85 | 168 | |
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86 | 169 | _FILE_ATTRIBUTE_NORMAL = 0x80 |
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87 | 170 | |
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88 | 171 | # open_osfhandle flags |
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89 | 172 | _O_RDONLY = 0x0000 |
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90 | 173 | _O_RDWR = 0x0002 |
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91 | 174 | _O_APPEND = 0x0008 |
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92 | 175 | |
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93 | 176 | _O_TEXT = 0x4000 |
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94 | 177 | _O_BINARY = 0x8000 |
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95 | 178 | |
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96 | 179 | # types of parameters of C functions used (required by pypy) |
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97 | 180 | |
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98 | 181 | _kernel32.CreateFileA.argtypes = [_LPCSTR, _DWORD, _DWORD, ctypes.c_void_p, |
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99 | 182 | _DWORD, _DWORD, _HANDLE] |
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100 | 183 | _kernel32.CreateFileA.restype = _HANDLE |
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101 | 184 | |
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102 | 185 | def _raiseioerror(name): |
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103 | 186 | err = ctypes.WinError() |
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104 | 187 | raise IOError(err.errno, '%s: %s' % (name, err.strerror)) |
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105 | 188 | |
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106 | 189 | class posixfile(object): |
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107 | 190 | '''a file object aiming for POSIX-like semantics |
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108 | 191 | |
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109 | 192 | CPython's open() returns a file that was opened *without* setting the |
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110 | 193 | _FILE_SHARE_DELETE flag, which causes rename and unlink to abort. |
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111 | 194 | This even happens if any hardlinked copy of the file is in open state. |
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112 | 195 | We set _FILE_SHARE_DELETE here, so files opened with posixfile can be |
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113 | 196 | renamed and deleted while they are held open. |
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114 | 197 | Note that if a file opened with posixfile is unlinked, the file |
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115 | 198 | remains but cannot be opened again or be recreated under the same name, |
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116 | 199 | until all reading processes have closed the file.''' |
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117 | 200 | |
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118 | 201 | def __init__(self, name, mode='r', bufsize=-1): |
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119 | 202 | if 'b' in mode: |
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120 | 203 | flags = _O_BINARY |
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121 | 204 | else: |
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122 | 205 | flags = _O_TEXT |
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123 | 206 | |
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124 | 207 | m0 = mode[0] |
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125 | 208 | if m0 == 'r' and '+' not in mode: |
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126 | 209 | flags |= _O_RDONLY |
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127 | 210 | access = _GENERIC_READ |
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128 | 211 | else: |
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129 | 212 | # work around http://support.microsoft.com/kb/899149 and |
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130 | 213 | # set _O_RDWR for 'w' and 'a', even if mode has no '+' |
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131 | 214 | flags |= _O_RDWR |
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132 | 215 | access = _GENERIC_READ | _GENERIC_WRITE |
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133 | 216 | |
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134 | 217 | if m0 == 'r': |
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135 | 218 | creation = _OPEN_EXISTING |
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136 | 219 | elif m0 == 'w': |
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137 | 220 | creation = _CREATE_ALWAYS |
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138 | 221 | elif m0 == 'a': |
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139 | 222 | creation = _OPEN_ALWAYS |
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140 | 223 | flags |= _O_APPEND |
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141 | 224 | else: |
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142 | 225 | raise ValueError("invalid mode: %s" % mode) |
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143 | 226 | |
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144 | 227 | fh = _kernel32.CreateFileA(name, access, |
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145 | 228 | _FILE_SHARE_READ | _FILE_SHARE_WRITE | _FILE_SHARE_DELETE, |
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146 | 229 | None, creation, _FILE_ATTRIBUTE_NORMAL, None) |
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147 | 230 | if fh == _INVALID_HANDLE_VALUE: |
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148 | 231 | _raiseioerror(name) |
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149 | 232 | |
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150 | 233 | fd = msvcrt.open_osfhandle(fh, flags) |
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151 | 234 | if fd == -1: |
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152 | 235 | _kernel32.CloseHandle(fh) |
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153 | 236 | _raiseioerror(name) |
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154 | 237 | |
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155 | 238 | f = os.fdopen(fd, mode, bufsize) |
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156 | 239 | # unfortunately, f.name is '<fdopen>' at this point -- so we store |
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157 | 240 | # the name on this wrapper. We cannot just assign to f.name, |
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158 | 241 | # because that attribute is read-only. |
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159 | 242 | object.__setattr__(self, 'name', name) |
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160 | 243 | object.__setattr__(self, '_file', f) |
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161 | 244 | |
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162 | 245 | def __iter__(self): |
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163 | 246 | return self._file |
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164 | 247 | |
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165 | 248 | def __getattr__(self, name): |
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166 | 249 | return getattr(self._file, name) |
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167 | 250 | |
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168 | 251 | def __setattr__(self, name, value): |
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169 | 252 | '''mimics the read-only attributes of Python file objects |
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170 | 253 | by raising 'TypeError: readonly attribute' if someone tries: |
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171 | 254 | f = posixfile('foo.txt') |
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172 | 255 | f.name = 'bla' ''' |
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173 | 256 | return self._file.__setattr__(name, value) |
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