Section 2

• obsolete · obsolete system calls
• oldfstat · get file status
• oldlstat · get file status
• oldolduname · get name and information about current kernel
• oldstat · get file status
• olduname · get name and information about current kernel
• open · open and possibly create a file
• open_by_handle_at · obtain handle for a pathname and open file via a handle
• open_tree · open path or create detached mount object and attach to fd
• open_tree_attr · open path or create detached mount object and attach to fd
• openat · open and possibly create a file
• openat2 · open and possibly create a file (extended)
• openat_authenticated_np · open files with authenticated volume verification
• outb · port I/O
• outb_p · port I/O
• outl · port I/O
• outl_p · port I/O
• outsb · port I/O
• outsl · port I/O
• outsw · port I/O
• outw · port I/O
• outw_p · port I/O
• OwnSelect · make a window the owner of the primary selection