socket: Address family not supported by protocol error on raspberry pi 3b+ with xenomai

Question

I have been trying to run the xddp-label.c example as given in the xenomai documentation on my raspberry pi model 3b+ with xenomai patched kernel. I can compile the program just fine, but when I try to run it I get the error: socket: Address family not supported by protocol. I noticed I get the same error when trying to compile other xddp examples from the documentation. I suspect it has something to do with the AF_RTIPC macro and the sockets, but I do not know anything about socket programming, so I am not sure. I hope someone can help me with this.

I am using a prebuilt xenomai kernel on my raspberry pi from this tutorial. I have tried running the program with a custom patched xenomai kernel as well, but without success.

For reference, the output of uname -a:

Linux raspberrypi 4.9.80-v7-xeno3+ #2 SMP PREEMPT Fri Aug 10 15:04:48 KST 2018 armv7l GNU/Linux

The makefile I am using to compile the program:

SKIN=posix
MAIN_SRC=xddp_label
TARGET=xddp_label
CC=g++
LM=-lm
CFLAGS := -g $(shell xeno-config --posix --skin=$(SKIN) --cflags)
LDFLAGS := -g $(LM) $(shell xeno-config --posix --skin=$(SKIN) --ldflags)
#CC := $(shell xeno-config --cc)
$(TARGET): $(MAIN_SRC).c
 $(CC) -o $@ $< $(CFLAGS) $(LDFLAGS)

I run the program with sudo ./xddp_label.c. The OS is raspbian buster.

• David: Hi Yousousen, great question! Could you please provide some additional information: what Raspberry Pi model are you using?
• Yousousen: Sure, I edited my question and added the model.

Answer 1

I have found the solution myself.

While building the kernel, in the kernel configuration the CONFIG_XENO_DRIVERS_RTIPC_XDDP option needs to be enabled.

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