### Functions and Macros: "N, O"

Function/Macro | #include file | ANSI/ISO | ANSI/ISO 93 | POSIX | XPG4 | Extension | Subsystem
nl_langinfo types for nl_langinfo | <langinfo.h> |  |  |  | X |  |
_onexit | <stdlib.h> |  |  |  |  | X |
open constants for open | <io.h> <fcntl.h> |  |  |  | X | X | X
_outp | <conio.h> <builtin.h> |  |  |  |  | X X |
_outpd | <conio.h> <builtin.h> |  |  |  |  | X X |
_outpw | <conio.h> <builtin.h> |  |  |  |  | X X |

IBM C and C++ Compilers Functions and Macros