FM / python

/usr/lib/python3/dist-packages/twisted/python/

/usr/lib/python3/dist-packages/twisted/python

Name	Size	Mode	Actions
test/	-	0755	rm
_pydoctortemplates/	-	0755	rm
__pycache__/	-	0755	rm
compat.py	16931	0644	edit dl rm
components.py	14199	0644	edit dl rm
constants.py	513	0644	edit dl rm
context.py	4054	0644	edit dl rm
deprecate.py	27668	0644	edit dl rm
failure.py	27007	0644	edit dl rm
fakepwd.py	6732	0644	edit dl rm
filepath.py	54023	0644	edit dl rm
formmethod.py	12107	0644	edit dl rm
htmlizer.py	3626	0644	edit dl rm
lockfile.py	8026	0644	edit dl rm
log.py	22302	0644	edit dl rm
logfile.py	10119	0644	edit dl rm
modules.py	26715	0644	edit dl rm
monkey.py	2164	0644	edit dl rm
procutils.py	1371	0644	edit dl rm
randbytes.py	3459	0644	edit dl rm
rebuild.py	7122	0644	edit dl rm
reflect.py	20480	0644	edit dl rm
release.py	1104	0644	edit dl rm
roots.py	7178	0644	edit dl rm
runtime.py	5924	0644	edit dl rm
sendmsg.py	2682	0644	edit dl rm
shortcut.py	2302	0644	edit dl rm
syslog.py	3652	0644	edit dl rm
systemd.py	2987	0644	edit dl rm
text.py	5417	0644	edit dl rm
threadable.py	3327	0644	edit dl rm
threadpool.py	10203	0644	edit dl rm
twisted-completion.zsh	1371	0644	edit dl rm
url.py	244	0644	edit dl rm
urlpath.py	8447	0644	edit dl rm
usage.py	34577	0644	edit dl rm
util.py	27432	0644	edit dl rm
versions.py	273	0644	edit dl rm
win32.py	4794	0644	edit dl rm
zippath.py	9028	0644	edit dl rm
zipstream.py	9680	0644	edit dl rm
_appdirs.py	820	0644	edit dl rm
_inotify.py	3496	0644	edit dl rm
_pydoctor.py	6735	0644	edit dl rm
_release.py	18879	0644	edit dl rm
_shellcomp.py	25279	0644	edit dl rm
_textattributes.py	9097	0644	edit dl rm
_tzhelper.py	3128	0644	edit dl rm
_url.py	228	0644	edit dl rm
__init__.py	598	0644	edit dl rm

Edit: /usr/lib/python3/dist-packages/twisted/python/_inotify.py (3496B)

# -*- test-case-name: twisted.internet.test.test_inotify -*-
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.

"""
Very low-level ctypes-based interface to Linux inotify(7).

ctypes and a version of libc which supports inotify system calls are
required.
"""

import ctypes
import ctypes.util
from typing import cast

from twisted.python.filepath import FilePath

class INotifyError(Exception):
    """
    Unify all the possible exceptions that can be raised by the INotify API.
    """

def init() -> int:
    """
    Create an inotify instance and return the associated file descriptor.
    """
    fd = cast(int, libc.inotify_init())
    if fd < 0:
        raise INotifyError("INotify initialization error.")
    return fd

def add(fd: int, path: FilePath, mask: int) -> int:
    """
    Add a watch for the given path to the inotify file descriptor, and return
    the watch descriptor.

@param fd: The file descriptor returned by C{libc.inotify_init}.
    @param path: The path to watch via inotify.
    @param mask: Bitmask specifying the events that inotify should monitor.
    """
    wd = cast(int, libc.inotify_add_watch(fd, path.asBytesMode().path, mask))
    if wd < 0:
        raise INotifyError(f"Failed to add watch on '{path!r}' - ({wd!r})")
    return wd

def remove(fd: int, wd: int) -> None:
    """
    Remove the given watch descriptor from the inotify file descriptor.
    """
    # When inotify_rm_watch returns -1 there's an error:
    # The errno for this call can be either one of the following:
    #  EBADF: fd is not a valid file descriptor.
    #  EINVAL: The watch descriptor wd is not valid; or fd is
    #          not an inotify file descriptor.
    #
    # if we can't access the errno here we cannot even raise
    # an exception and we need to ignore the problem, one of
    # the most common cases is when you remove a directory from
    # the filesystem and that directory is observed. When inotify
    # tries to call inotify_rm_watch with a non existing directory
    # either of the 2 errors might come up because the files inside
    # it might have events generated way before they were handled.
    # Unfortunately only ctypes in Python 2.6 supports accessing errno:
    #  http://bugs.python.org/issue1798 and in order to solve
    # the problem for previous versions we need to introduce
    # code that is quite complex:
    #  http://stackoverflow.com/questions/661017/access-to-errno-from-python
    #
    # See #4310 for future resolution of this issue.
    libc.inotify_rm_watch(fd, wd)

def initializeModule(libc: ctypes.CDLL) -> None:
    """
    Initialize the module, checking if the expected APIs exist and setting the
    argtypes and restype for C{inotify_init}, C{inotify_add_watch}, and
    C{inotify_rm_watch}.
    """
    for function in ("inotify_add_watch", "inotify_init", "inotify_rm_watch"):
        if getattr(libc, function, None) is None:
            raise ImportError("libc6 2.4 or higher needed")
    libc.inotify_init.argtypes = []
    libc.inotify_init.restype = ctypes.c_int

libc.inotify_rm_watch.argtypes = [ctypes.c_int, ctypes.c_int]
    libc.inotify_rm_watch.restype = ctypes.c_int

libc.inotify_add_watch.argtypes = [ctypes.c_int, ctypes.c_char_p, ctypes.c_uint32]
    libc.inotify_add_watch.restype = ctypes.c_int

name = ctypes.util.find_library("c")
if not name:
    raise ImportError("Can't find C library.")
libc = ctypes.cdll.LoadLibrary(name)
initializeModule(libc)

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