module ChildProcess

# File lib/childprocess.rb, line 89
def close_on_exec(file)
  if file.respond_to?(:close_on_exec=)
    file.close_on_exec = true
  elsif file.respond_to?(:fcntl) && defined?(Fcntl::FD_CLOEXEC)
    file.fcntl Fcntl::F_SETFD, Fcntl::FD_CLOEXEC
  elsif windows?
    Windows.dont_inherit file
  else
    raise Error, "not sure how to set close-on-exec for #{file.inspect} on #{platform.inspect}"
  end
end

# File lib/childprocess.rb, line 48
def jruby?
  platform == :jruby
end

# File lib/childprocess.rb, line 52
def jruby_on_unix?
  return false unless jruby?
  # patterns grabbed from http://lopica.sourceforge.net/os.html
  require "java"
  name = java.lang.System.getProperty("os.name").downcase
  name =~ %rmac os|linux|solaris|bsd/
end

# File lib/childprocess.rb, line 14
def new(*args)
  case platform
  when :jruby
    JRuby::Process.new(args)
  when :ironruby
    IronRuby::Process.new(args)
  when :windows
    Windows::Process.new(args)
  when :macosx, :linux, :unix, :cygwin
    Unix::Process.new(args)
  else
    raise Error, "unsupported platform #{platform.inspect}"
  end
end

# File lib/childprocess.rb, line 64
def os
  @os ||= (
    require "rbconfig"
    host_os = RbConfig::CONFIG['host_os']

    case host_os
    when %rmswin|msys|mingw32|cygwin/
      :windows
    when %rdarwin|mac os/
      :macosx
    when %rlinux/
      :linux
    when %rsolaris|bsd/
      :unix
    else
      raise Error, "unknown os: #{host_os.inspect}"
    end
  )
end

# File lib/childprocess.rb, line 30
def platform
  if RUBY_PLATFORM == "java"
    :jruby
  elsif defined?(RUBY_ENGINE) && RUBY_ENGINE == "ironruby"
    :ironruby
  elsif RUBY_PLATFORM =~ %rmswin|msys|mingw32/
    :windows
  elsif RUBY_PLATFORM =~ %rcygwin/
    :cygwin
  else
    os
  end
end

# File lib/childprocess.rb, line 44
def unix?
  !jruby? && [:macosx, :linux, :unix].include?(os)
end

# File lib/childprocess.rb, line 60
def windows?
  !jruby? && os == :windows
end