Module: SubSpawn::POSIX::PtyHelper

Defined in:
lib/subspawn/posix/pty.rb

Defined Under Namespace

Classes: PtyIO

Class Method Summary collapse

Class Method Details

.open ⇒ Object 



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# File 'lib/subspawn/posix/pty.rb', line 45

def self.open
  *files, name = open_internal(true)
  return files unless block_given?

  begin
    return yield files.dup # Array, not splatted
  ensure
    files.reject(&:closed?).each(&:close)
  end
end

.open_internal(chmod_for_open = false) ⇒ Object 



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# File 'lib/subspawn/posix/pty.rb', line 25

def self.open_internal(chmod_for_open = false)
  m, s, name = Internal::OpenPTY.call

  # chmod the slave path, but only if were were called as ::open, not as ::spawn
  # I don't understand why, but doing this just to mirror MRI
  File.chmod(0o600, name) if chmod_for_open

  master = PtyIO.for_fd(m, IO::RDWR | IO::SYNC)
  master.send(:__subspawn_init, name)

  # we could shim the slave to be a fake file, or we could just re-open the path
  # which fixes #inspect, #tty?, #path, and #close_on_exec, all in one go
  # https://bugs.ruby-lang.org/issues/19036
  slave = File.open(name, IO::RDWR | IO::SYNC)
  slave.sync = true # still must do this manually though, as IO::SYNC seems to be mostly ignored
  Internal::OpenPTY.close(s)

  [master, slave, name]
end