* use `read()` instead of `recv()`
* use `write()` instead of `send()`
* use `CONFIG_POSIX_API` and drop `<zephyr/posix/..>` prefix
* use `perror()`
* fix `Makefile.posix` to use `CC` instead of `CXX`
* fix race condition which caused an unhandled EOF
and infinite loop, by adding a readback / echo
* Updated the docs to reflect the expected stdout
* Improve doc clarity
Signed-off-by: Chris Friedt <cfriedt@meta.com>
Support for the socketpair(2) system call was recently
added for 2.3.0 .
This change adds a sample application that demonstrates
how it can be used.
Fixes#25527
Signed-off-by: Christopher Friedt <chrisfriedt@gmail.com>
