Hi! I am András Retzler,
an open source enthusiast,
engineer, and radio amateur.

My open source projects

Notes on using rpitx with GNU Radio and csdr

Nov 8, 2015

You can find my article on Github.

The source of this post is my previous blog at HA5KFU.

Playing audio with gr-ha5kfu if Audio Sink fails

I’ve got continuous underruns and overruns, clicks with Audio Sink in GNU Radio, so I used the Execute External Process Sink in gr-ha5kfu, with csdr, and the mplayer command line tools.

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fork() and stdin behaviour

I’ve stumbled upon this: if we fork() a process, its standard input and output file descriptors remain the same for both processes. It means that the forked process can read() from stdin, and then the read data is taken away, and the original process can’t read it.

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