| paul@6 | 1 | #!/usr/bin/env python |
| paul@6 | 2 | |
| paul@328 | 3 | """ |
| paul@328 | 4 | POSIX input/output functions. |
| paul@328 | 5 | |
| paul@328 | 6 | Copyright (C) 2016 Paul Boddie <paul@boddie.org.uk> |
| paul@328 | 7 | |
| paul@328 | 8 | This program is free software; you can redistribute it and/or modify it under |
| paul@328 | 9 | the terms of the GNU General Public License as published by the Free Software |
| paul@328 | 10 | Foundation; either version 3 of the License, or (at your option) any later |
| paul@328 | 11 | version. |
| paul@328 | 12 | |
| paul@328 | 13 | This program is distributed in the hope that it will be useful, but WITHOUT |
| paul@328 | 14 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
| paul@328 | 15 | FOR A PARTICULAR PURPOSE. See the GNU General Public License for more |
| paul@328 | 16 | details. |
| paul@328 | 17 | |
| paul@328 | 18 | You should have received a copy of the GNU General Public License along with |
| paul@328 | 19 | this program. If not, see <http://www.gnu.org/licenses/>. |
| paul@328 | 20 | """ |
| paul@328 | 21 | |
| paul@328 | 22 | import native |
| paul@328 | 23 | |
| paul@336 | 24 | # Abstractions for system-level files and streams. |
| paul@336 | 25 | |
| paul@332 | 26 | class sysfile: |
| paul@332 | 27 | |
| paul@332 | 28 | "A system-level file object." |
| paul@332 | 29 | |
| paul@332 | 30 | def __init__(self, fd): |
| paul@332 | 31 | |
| paul@332 | 32 | "Initialise the file with the given 'fd'." |
| paul@332 | 33 | |
| paul@332 | 34 | self.fd = fd |
| paul@332 | 35 | |
| paul@332 | 36 | def read(self, n): |
| paul@332 | 37 | |
| paul@336 | 38 | "Read 'n' bytes from the file, returning a string." |
| paul@332 | 39 | |
| paul@336 | 40 | _check_int(n) |
| paul@332 | 41 | return read(self.fd, n) |
| paul@332 | 42 | |
| paul@332 | 43 | def write(self, s): |
| paul@332 | 44 | |
| paul@336 | 45 | "Write string 's' to the file." |
| paul@336 | 46 | |
| paul@336 | 47 | _check_string(s) |
| paul@336 | 48 | write(self.fd, s) |
| paul@336 | 49 | |
| paul@336 | 50 | class sysstream: |
| paul@336 | 51 | |
| paul@336 | 52 | "A system-level stream object." |
| paul@336 | 53 | |
| paul@336 | 54 | def __init__(self, fd, mode="r"): |
| paul@336 | 55 | |
| paul@336 | 56 | "Initialise the stream with the given 'fd' and 'mode'." |
| paul@336 | 57 | |
| paul@336 | 58 | self.__data__ = fdopen(fd, mode) |
| paul@332 | 59 | |
| paul@336 | 60 | def read(self, n): |
| paul@336 | 61 | |
| paul@336 | 62 | "Read 'n' bytes from the stream." |
| paul@336 | 63 | |
| paul@336 | 64 | _check_int(n) |
| paul@336 | 65 | return native._fread(self.__data__, n) |
| paul@336 | 66 | |
| paul@336 | 67 | def write(self, s): |
| paul@336 | 68 | |
| paul@336 | 69 | "Write string 's' to the stream." |
| paul@336 | 70 | |
| paul@336 | 71 | _check_string(s) |
| paul@336 | 72 | native._fwrite(self.__data__, s) |
| paul@336 | 73 | |
| paul@337 | 74 | # Standard streams. |
| paul@337 | 75 | |
| paul@337 | 76 | stdin = sysstream(0) |
| paul@337 | 77 | stdout = sysstream(1, "w") |
| paul@337 | 78 | stderr = sysstream(2, "w") |
| paul@337 | 79 | |
| paul@336 | 80 | # Input/output functions. |
| paul@332 | 81 | |
| paul@6 | 82 | def close(fd): pass |
| paul@6 | 83 | def closerange(fd_low, fd_high): pass |
| paul@6 | 84 | def dup(fd): pass |
| paul@6 | 85 | def dup2(old_fd, new_fd): pass |
| paul@328 | 86 | def fchdir(fd): pass |
| paul@6 | 87 | def fchmod(fd, mode): pass |
| paul@6 | 88 | def fchown(fd, uid, gid): pass |
| paul@328 | 89 | def fdatasync(fd): pass |
| paul@328 | 90 | |
| paul@328 | 91 | def fdopen(fd, mode="r"): |
| paul@328 | 92 | |
| paul@328 | 93 | """ |
| paul@328 | 94 | Open a stream for the given file descriptor 'fd', operating in the given |
| paul@328 | 95 | 'mode'. |
| paul@328 | 96 | """ |
| paul@328 | 97 | |
| paul@328 | 98 | _check_fd(fd) |
| paul@328 | 99 | _check_string(mode) |
| paul@328 | 100 | return native._fdopen(fd, mode) |
| paul@328 | 101 | |
| paul@6 | 102 | def fpathconf(fd, name): pass |
| paul@6 | 103 | def fstat(fd): pass |
| paul@6 | 104 | def fstatvfs(fd): pass |
| paul@328 | 105 | def fsync(fd): pass |
| paul@6 | 106 | def ftruncate(fd, length): pass |
| paul@6 | 107 | def isatty(fd): pass |
| paul@328 | 108 | |
| paul@328 | 109 | SEEK_CUR = 1 |
| paul@328 | 110 | SEEK_END = 2 |
| paul@328 | 111 | SEEK_SET = 0 |
| paul@328 | 112 | |
| paul@6 | 113 | def lseek(fd, pos, how): pass |
| paul@6 | 114 | def open(filename, flag, mode=0777): pass |
| paul@6 | 115 | def openpty(): pass |
| paul@6 | 116 | def pipe(): pass |
| paul@6 | 117 | def putenv(key, value): pass |
| paul@328 | 118 | |
| paul@328 | 119 | def read(fd, n): |
| paul@328 | 120 | |
| paul@328 | 121 | """ |
| paul@328 | 122 | Read using the low-level file descriptor 'fd' the given number of bytes 'n'. |
| paul@328 | 123 | """ |
| paul@328 | 124 | |
| paul@328 | 125 | _check_fd(fd) |
| paul@328 | 126 | _check_int(n) |
| paul@328 | 127 | return native._read(fd, n) |
| paul@328 | 128 | |
| paul@6 | 129 | def times(): pass |
| paul@6 | 130 | def ttyname(fd): pass |
| paul@6 | 131 | def umask(new_mask): pass |
| paul@6 | 132 | def uname(): pass |
| paul@6 | 133 | def unsetenv(key): pass |
| paul@328 | 134 | |
| paul@328 | 135 | def write(fd, s): |
| paul@328 | 136 | |
| paul@328 | 137 | "Write using the low-level file descriptor 'fd' the given string 's'." |
| paul@328 | 138 | |
| paul@328 | 139 | _check_fd(fd) |
| paul@328 | 140 | _check_string(s) |
| paul@328 | 141 | native._write(fd, s) |
| paul@6 | 142 | |
| paul@336 | 143 | # Constants. |
| paul@336 | 144 | |
| paul@6 | 145 | O_APPEND = 1024 |
| paul@6 | 146 | O_ASYNC = 8192 |
| paul@6 | 147 | O_CREAT = 64 |
| paul@6 | 148 | O_DIRECT = 16384 |
| paul@6 | 149 | O_DIRECTORY = 65536 |
| paul@6 | 150 | O_DSYNC = 4096 |
| paul@6 | 151 | O_EXCL = 128 |
| paul@6 | 152 | O_LARGEFILE = 32768 |
| paul@6 | 153 | O_NDELAY = 2048 |
| paul@6 | 154 | O_NOATIME = 262144 |
| paul@6 | 155 | O_NOCTTY = 256 |
| paul@6 | 156 | O_NOFOLLOW = 131072 |
| paul@6 | 157 | O_NONBLOCK = 2048 |
| paul@6 | 158 | O_RDONLY = 0 |
| paul@6 | 159 | O_RDWR = 2 |
| paul@6 | 160 | O_RSYNC = 1052672 |
| paul@6 | 161 | O_SYNC = 1052672 |
| paul@6 | 162 | O_TRUNC = 512 |
| paul@6 | 163 | O_WRONLY = 1 |
| paul@6 | 164 | |
| paul@336 | 165 | # Type validation functions. |
| paul@336 | 166 | |
| paul@328 | 167 | def _check_fd(fd): |
| paul@328 | 168 | |
| paul@328 | 169 | "Check the given low-level file descriptor 'fd'." |
| paul@328 | 170 | |
| paul@328 | 171 | if not native._isinstance(fd, int): |
| paul@328 | 172 | raise ValueError(fd) |
| paul@328 | 173 | |
| paul@328 | 174 | def _check_int(i): |
| paul@328 | 175 | |
| paul@328 | 176 | "Check the given int 'i'." |
| paul@328 | 177 | |
| paul@328 | 178 | if not native._isinstance(i, int): |
| paul@328 | 179 | raise ValueError(i) |
| paul@328 | 180 | |
| paul@328 | 181 | def _check_string(s): |
| paul@328 | 182 | |
| paul@328 | 183 | "Check the given string 's'." |
| paul@328 | 184 | |
| paul@328 | 185 | if not native._isinstance(s, string): |
| paul@328 | 186 | raise ValueError(s) |
| paul@6 | 187 | |
| paul@6 | 188 | # vim: tabstop=4 expandtab shiftwidth=4 |
