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Diffstat (limited to 'gnuradio-runtime/python/gnuradio/gru/os_read_exactly.py')
| -rw-r--r-- | gnuradio-runtime/python/gnuradio/gru/os_read_exactly.py | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/gnuradio-runtime/python/gnuradio/gru/os_read_exactly.py b/gnuradio-runtime/python/gnuradio/gru/os_read_exactly.py new file mode 100644 index 0000000000..40b053770e --- /dev/null +++ b/gnuradio-runtime/python/gnuradio/gru/os_read_exactly.py @@ -0,0 +1,36 @@ +# +# Copyright 2005 Free Software Foundation, Inc. +# +# This file is part of GNU Radio +# +# GNU Radio is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 3, or (at your option) +# any later version. +# +# GNU Radio is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with GNU Radio; see the file COPYING. If not, write to +# the Free Software Foundation, Inc., 51 Franklin Street, +# Boston, MA 02110-1301, USA. +# + +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 |