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| | # 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 'writable_iter'
require_relative 'nonblock'
# pipe wrapper for -player sinks
class DTAS::Pipe < DTAS::Nonblock # :nodoc:
include DTAS::WritableIter
attr_accessor :sink
if RUBY_PLATFORM =~ /linux/i && File.readable?('/proc/sys/fs/pipe-max-size')
F_SETPIPE_SZ = 1031
F_GETPIPE_SZ = 1032
end
def self.new
_, w = rv = pipe
w.writable_iter_init
rv
end
def pipe_size=(nr)
fcntl(F_SETPIPE_SZ, nr) if defined?(F_SETPIPE_SZ)
rescue Errno::EINVAL # old kernel
rescue Errno::EPERM
# resizes fail if Linux is close to the pipe limit for the user
# or if the user does not have permissions to resize
end
def pipe_size
fcntl(F_GETPIPE_SZ)
end if defined?(F_GETPIPE_SZ)
# avoid syscall, we never change IO#nonblock= directly
def nonblock?
false
end
end
# for non-blocking sinks, this avoids extra fcntl(..., F_GETFL) syscalls
# We don't need fcntl at all for splice/tee in Linux
# For non-Linux, we write_nonblock/read_nonblock already call fcntl()
# behind our backs, so there's no need to repeat it.
class DTAS::PipeNB < DTAS::Pipe # :nodoc:
def nonblock?
true
end
end
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