1 #!/usr/bin/env python 2 3 """ 4 POSIX input/output functions. 5 6 Copyright (C) 2016 Paul Boddie <paul@boddie.org.uk> 7 8 This program is free software; you can redistribute it and/or modify it under 9 the terms of the GNU General Public License as published by the Free Software 10 Foundation; either version 3 of the License, or (at your option) any later 11 version. 12 13 This program is distributed in the hope that it will be useful, but WITHOUT 14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 15 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more 16 details. 17 18 You should have received a copy of the GNU General Public License along with 19 this program. If not, see <http://www.gnu.org/licenses/>. 20 """ 21 22 from __builtins__.file import filestream 23 from __builtins__.types import check_int, check_string 24 25 from native import ( 26 close as _close, 27 fdopen as _fdopen, 28 read as _read, 29 write as _write 30 ) 31 32 import locale 33 34 # Abstractions for system-level files and streams. 35 36 class sysfile: 37 38 "A system-level file object." 39 40 def __init__(self, fd): 41 42 "Initialise the file with the given 'fd'." 43 44 self.fd = fd 45 46 def read(self, n): 47 48 "Read 'n' bytes from the file, returning a string." 49 50 return read(self.fd, n) 51 52 def write(self, s): 53 54 "Write string 's' to the file." 55 56 return write(self.fd, s) 57 58 def close(self): 59 60 "Close the file." 61 62 close(self.fd) 63 64 class sysstream(filestream): 65 66 "A system-level stream object." 67 68 def __init__(self, fd, mode="r", encoding=None, bufsize=1024): 69 70 """ 71 Initialise the stream with the given 'fd', 'mode', 'encoding' and 72 'bufsize'. 73 """ 74 75 get_using(filestream.__init__, self)(encoding, bufsize) 76 self.__data__ = fdopen(fd, mode) 77 78 # Standard streams. 79 80 stdin = sysstream(0) 81 stdout = sysstream(1, "w") 82 stderr = sysstream(2, "w") 83 84 # Localised streams. 85 # Perform locale initialisation explicitly to ensure that the locale module 86 # and various function defaults have been initialised. 87 88 locale.initlocale() 89 lstdin = sysstream(0, "r", locale.getpreferredencoding()) 90 91 # Input/output functions. 92 93 def close(fd): 94 95 "Close the file descriptor 'fd'." 96 97 _close(fd) 98 99 def closerange(fd_low, fd_high): pass 100 def dup(fd): pass 101 def dup2(old_fd, new_fd): pass 102 def fchdir(fd): pass 103 def fchmod(fd, mode): pass 104 def fchown(fd, uid, gid): pass 105 def fdatasync(fd): pass 106 107 def fdopen(fd, mode="r"): 108 109 """ 110 Open a stream for the given file descriptor 'fd', operating in the given 111 'mode'. 112 """ 113 114 check_int(fd) 115 check_string(mode) 116 return _fdopen(fd, mode) 117 118 def fpathconf(fd, name): pass 119 def fstat(fd): pass 120 def fstatvfs(fd): pass 121 def fsync(fd): pass 122 def ftruncate(fd, length): pass 123 def isatty(fd): pass 124 125 SEEK_CUR = 1 126 SEEK_END = 2 127 SEEK_SET = 0 128 129 def lseek(fd, pos, how): pass 130 def open(filename, flag, mode=0777): pass 131 def openpty(): pass 132 def pipe(): pass 133 def putenv(key, value): pass 134 135 def read(fd, n): 136 137 """ 138 Read using the low-level file descriptor 'fd' the given number of bytes 'n'. 139 """ 140 141 check_int(fd) 142 check_int(n) 143 return _read(fd, n) 144 145 def times(): pass 146 def ttyname(fd): pass 147 def umask(new_mask): pass 148 def uname(): pass 149 def unsetenv(key): pass 150 151 def write(fd, s): 152 153 "Write using the low-level file descriptor 'fd' the given string 's'." 154 155 check_int(fd) 156 check_string(s) 157 return _write(fd, s) 158 159 # Constants. 160 161 O_APPEND = 1024 162 O_ASYNC = 8192 163 O_CREAT = 64 164 O_DIRECT = 16384 165 O_DIRECTORY = 65536 166 O_DSYNC = 4096 167 O_EXCL = 128 168 O_LARGEFILE = 32768 169 O_NDELAY = 2048 170 O_NOATIME = 262144 171 O_NOCTTY = 256 172 O_NOFOLLOW = 131072 173 O_NONBLOCK = 2048 174 O_RDONLY = 0 175 O_RDWR = 2 176 O_RSYNC = 1052672 177 O_SYNC = 1052672 178 O_TRUNC = 512 179 O_WRONLY = 1 180 181 # vim: tabstop=4 expandtab shiftwidth=4
