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from __future__ import unicode_literals
#
# Copyright 2005 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# SPDX-License-Identifier: GPL-3.0-or-later
#
#
import os
def os_read_exactly(file_descriptor, nbytes):
"""
Replacement for os.read that blocks until it reads exactly nbytes.
"""
s = ''
while nbytes > 0:
sbuf = os.read(file_descriptor, nbytes)
if not(sbuf):
return ''
nbytes -= len(sbuf)
s = s + sbuf
return s
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