1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
| | # Copyright (C) 2013-2019 all contributors <dtas-all@nongnu.org>
# License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
# frozen_string_literal: true
require_relative '../dtas'
require_relative 'nonblock'
begin
module DTAS::Watchable # :nodoc:
module InotifyCommon # :nodoc:
FLAGS = 8 | 128 # IN_CLOSE_WRITE | IN_MOVED_TO
def readable_iter
or_call = false
while event = take(true) # drain the buffer
w = @watches[event.wd] or next
if (event.mask & FLAGS) != 0 && w[event.name]
or_call = true
end
end
if or_call
@on_readable.call
:delete
else
:wait_readable
end
end
# we must watch the directory, since
def watch_files(paths, blk)
@watches = {} # wd -> { basename -> true }
@on_readable = blk
@dir2wd = {}
Array(paths).each do |path|
watchdir, watchbase = File.split(File.expand_path(path))
begin
wd = @dir2wd[watchdir] ||= add_watch(watchdir, FLAGS)
m = @watches[wd] ||= {}
m[watchbase] = true
rescue SystemCallError => e
warn "#{watchdir.dump}: #{e.message} (#{e.class})"
end
end
end
end # module InotifyCommon
begin
require_relative 'watchable/inotify'
rescue LoadError
# TODO: support kevent
require_relative 'watchable/fiddle_ino'
end
def watch_begin(blk)
@ino = DTAS::Watchable::InotifyReadableIter.new
@ino.watch_files(@watch_extra << @infile, blk)
@ino
end
def watch_extra(paths)
@ino.watch_extra(paths)
end
# Closing the inotify descriptor (instead of using inotify_rm_watch)
# is cleaner because it avoids EINVAL on race conditions in case
# a directory is deleted: https://lkml.org/lkml/2007/7/9/3
def watch_end(srv)
srv.wait_ctl(@ino, :delete)
@ino = @ino.close
end
end # module DTAS::Watchable
rescue LoadError, StandardError => e
warn "#{e.message} (#{e.class})"
end # begin
|