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Contents
require 'ffi'
module Inotify
extend FFI::Library
ffi_lib FFI::Library::LIBC
class Event < FFI::Struct
layout \
:wd, :int,
:mask, :uint,
:cookie, :uint,
:len, :uint
end
attach_function :init, :inotify_init, [ ], :int
attach_function :add_watch, :inotify_add_watch, [ :int, :string, :uint ], :int
attach_function :rm_watch, :inotify_rm_watch, [ :int, :uint ], :int
attach_function :read, [ :int, :buffer_out, :uint ], :int
IN_ACCESS=0x00000001
IN_MODIFY=0x00000002
IN_ATTRIB=0x00000004
IN_CLOSE_WRITE=0x00000008
IN_CLOSE_NOWRITE=0x00000010
IN_CLOSE=(IN_CLOSE_WRITE | IN_CLOSE_NOWRITE)
IN_OPEN=0x00000020
IN_MOVED_FROM=0x00000040
IN_MOVED_TO=0x00000080
IN_MOVE= (IN_MOVED_FROM | IN_MOVED_TO)
IN_CREATE=0x00000100
IN_DELETE=0x00000200
IN_DELETE_SELF=0x00000400
IN_MOVE_SELF=0x00000800
# Events sent by the kernel.
IN_UNMOUNT=0x00002000
IN_Q_OVERFLOW=0x00004000
IN_IGNORED=0x00008000
IN_ONLYDIR=0x01000000
IN_DONT_FOLLOW=0x02000000
IN_MASK_ADD=0x20000000
IN_ISDIR=0x40000000
IN_ONESHOT=0x80000000
IN_ALL_EVENTS=(IN_ACCESS | IN_MODIFY | IN_ATTRIB | IN_CLOSE_WRITE \
| IN_CLOSE_NOWRITE | IN_OPEN | IN_MOVED_FROM \
| IN_MOVED_TO | IN_CREATE | IN_DELETE \
| IN_DELETE_SELF | IN_MOVE_SELF)
end
if $0 == __FILE__
fd = Inotify.init
puts "fd=#{fd}"
wd = Inotify.add_watch(fd, "/tmp/", Inotify::IN_ALL_EVENTS)
fp = FFI::IO.for_fd(fd)
puts "wfp=#{fp}"
while true
buf = FFI::Buffer.alloc_out(Inotify::Event.size + 4096, 1, false)
ev = Inotify::Event.new buf
ready = IO.select([ fp ], nil, nil, nil)
n = Inotify.read(fd, buf, buf.total)
puts "Read #{n} bytes from inotify fd"
puts "event.wd=#{ev[:wd]} mask=#{ev[:mask]} len=#{ev[:len]} name=#{ev[:len] > 0 ? buf.get_string(16) : 'unknown'}"
end
end
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