def read(self, address):
u""" Nuskaito iš atminties virtualios mašinos puslapiavimo lentelę.
"""
self.PLR, self.PLBR = self.memory.get_address_tuple(address)
for id in range(4):
mode, name = self.get_file_descriptor(id)
if mode == 'i':
self.files[id] = self.create_reader(self.stdin_handler)
elif mode == 'o':
self.files[id] = self.create_writer(self.stdout_handler)
elif mode == 'r':
self.files[id] = self.create_reader(
file_system.open(name).read)
elif mode == 'w':
self.files[id] = self.create_writer(
file_system.create(name).write)
def file_create(self, name):
u""" Atidaro failą rašymui.
Sukuria failo deskriptorių ir grąžina failo id.
"""
for id in range(4):
mode, file_name = self.get_file_descriptor(id)
if mode != 0 and file_name == name:
raise ValueError(u'Failas tokiu vardu jau atidarytas.')
for id in range(4):
mode, file_name = self.get_file_descriptor(id)
if mode == '0':
self.set_file_descriptor(id, 'w', name)
self.files[id] = self.create_writer(
file_system.create(name).write)
return id
raise Exception(u'Viršytas atidarytų failų limitas.')
