class SystemFunction(object):

	name = None

	@classmethod

	def getFunctionName(cls):

		return cls.name

	@classmethod

	def getMakeName(cls):

		return cls.name.upper()

	@classmethod

	def iterHeaders(cls, targetPlatform):

		raise NotImplementedError

class FTruncateFunction(SystemFunction):

	name = 'ftruncate'

	@classmethod

	def iterHeaders(cls, targetPlatform):

		yield '<unistd.h>'

class MMapFunction(SystemFunction):

	name = 'mmap'

	@classmethod

	def iterHeaders(cls, targetPlatform):

		if targetPlatform in ('darwin', 'openbsd'):

			yield '<sys/types.h>'

		yield '<sys/mman.h>'

# Build a list of system functions using introspection.

systemFunctions = [

	obj

	for obj in locals().values()

	if isinstance(obj, type)

		and issubclass(obj, SystemFunction)

		and obj is not SystemFunction

	]