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require "fcntl"
class IO
def nonblock?
(fcntl(Fcntl::F_GETFL) & File::NONBLOCK) != 0
end
def nonblock=(nb)
f = fcntl(Fcntl::F_GETFL)
if nb
f |= File::NONBLOCK
else
f &= ~File::NONBLOCK
end
fcntl(Fcntl::F_SETFL, f)
end
def nonblock(nb = true)
nb, self.nonblock = nonblock?, nb
yield
ensure
self.nonblock = nb
end
end if defined?(Fcntl::F_GETFL)