POSIX

See the following pages for POSIX

https://en.kompf.de/cplus/posixlist.html

https://pubs.opengroup.org/onlinepubs/9699919799/toc.htm

Choose two POSIX APIs (e.g., pthread_create, mq_open, fork) and write detailed explanations on how they work, their parameters, return values, and typical use cases.