Warning: broken pipe -- some output may be lost

GNU Radio
1

Hi,I use file sink in GRC and Random Source,and want to see the data
with read_short_binary.m in Octave, but it appears like this:octave:10>
a1=read_short_binary(‘a.dat’,1e5)
warning: broken pipe – some output may be lost.
So what’s wrong?
Thank you.
Brooke