FIFOs

GNU Radio
1

Hi

I’m trying to write USRP data to a FIFO and read it out using a C++
app. I can’t get it to work. What I did was to type ‘mkfifo myfifo’
in the shell. This is the output to ls -l myfifo.

prw-r–r-- 1 sebastiaan sebastiaan 0 2008-07-23 14:20 myfifo

I then tried to run my application, passing myfifo as a parameter.
This is the line of Python code that sets up the filesink.

self.dst = gr.file_sink(gr.sizeof_gr_complex, filename)

When I run the application, it hangs and when I press CTRL+C, I get
the following output.

myfifo: Interrupted system call
terminate called after throwing an instance of ‘std::runtime_error’
what(): can’t open file
Aborted

Can anyone please tell me if there are any other steps to get this to
work?

Thank you very much.

Sebastiaan

2

On Wed, Jul 23, 2008 at 02:32:06PM +0200, Sebastiaan H. wrote:

Can anyone please tell me if there are any other steps to get this to work?

Thank you very much.

Sebastiaan

You need to have a process reading on the FIFO too.

I suggest trying this out by hand on the command line first, using
“cat” to read and write data from the fifo.

Eric