module ChildProcess

# File lib/childprocess.rb, line 105
def arch
  @arch ||= (
    host_cpu = RbConfig::CONFIG['host_cpu'].downcase
    case host_cpu
    when /i[3456]86/
      if workaround_older_macosx_misreported_cpu?
        # Workaround case: older 64-bit Darwin Rubies misreported as i686
        "x86_64"
      else
        "i386"
      end
    when /amd64|x86_64/
      "x86_64"
    when /ppc|powerpc/
      "powerpc"
    else
      host_cpu
    end
  )
end

# File lib/childprocess.rb, line 132
def close_on_exec(file)
  if file.respond_to?(:close_on_exec=)
    file.close_on_exec = true
  else
    raise Error, "not sure how to set close-on-exec for #{file.inspect} on #{platform_name.inspect}"
  end
end

# File lib/childprocess.rb, line 53
def jruby?
  RUBY_ENGINE == 'jruby'
end

# File lib/childprocess.rb, line 49
def linux?
  os == :linux
end

# File lib/childprocess.rb, line 28
def logger
  return @logger if defined?(@logger) and @logger

  @logger = Logger.new($stderr)
  @logger.level = $DEBUG ? Logger::DEBUG : Logger::INFO

  @logger
end

# File lib/childprocess.rb, line 16
def new(*args)
  case os
  when :macosx, :linux, :solaris, :bsd, :cygwin, :aix
    Unix::Process.new(*args)
  when :windows
    Windows::Process.new(*args)
  else
    raise Error, "unsupported platform #{platform_name.inspect}"
  end
end

# File lib/childprocess.rb, line 77
def os
  return :windows if ENV['FAKE_WINDOWS'] == 'true'

  @os ||= (
    require "rbconfig"
    host_os = RbConfig::CONFIG['host_os'].downcase

    case host_os
    when /linux/
      :linux
    when /darwin|mac os/
      :macosx
    when /mswin|msys|mingw32/
      :windows
    when /cygwin/
      :cygwin
    when /solaris|sunos/
      :solaris
    when /bsd|dragonfly/
      :bsd
    when /aix/
      :aix
    else
      raise Error, "unknown os: #{host_os.inspect}"
    end
  )
end

# File lib/childprocess.rb, line 37
def platform
  os
end

# File lib/childprocess.rb, line 41
def platform_name
  @platform_name ||= "#{arch}-#{os}"
end

# File lib/childprocess.rb, line 73
def posix_spawn=(bool)
  @posix_spawn = bool
end

# File lib/childprocess.rb, line 65
def posix_spawn?
  false
end

# File lib/childprocess.rb, line 61
def posix_spawn_chosen_explicitly?
  @posix_spawn || %w[1 true].include?(ENV['CHILDPROCESS_POSIX_SPAWN'])
end

# File lib/childprocess.rb, line 45
def unix?
  !windows?
end

# File lib/childprocess.rb, line 57
def windows?
  os == :windows
end

# File lib/childprocess.rb, line 162
def is_64_bit?
  1.size == 8
end

# File lib/childprocess.rb, line 142
def warn_once(msg)
  @warnings ||= {}

  unless @warnings[msg]
    @warnings[msg] = true
    logger.warn msg
  end
end

# File lib/childprocess.rb, line 157
def workaround_older_macosx_misreported_cpu?
  os == :macosx && is_64_bit?
end