Posix

Module: std.c.posix

Headers

unistd (read, write, close, fork), fcntl (open flags), dirent (opendir, readdir), pthread (threads, mutexes), semaphore, sched, mqueue, signal, wait.

sys/*

sys/socket (socket families, bind, connect), sys/stat (stat struct), sys/mman (mmap), sys/time, sys/resource, sys/utsname.

Full lists in std/c/posix/.