Compaq C
Run-Time Library Reference Manual for OpenVMS Systems

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`__stdc_version__` macro
`_ansi_c_source` macro
`_bsd44_curses` macro
`_decc_v4_source` macro
`_exit` function #1
`_exit` function #2
`_posix_c_source` macro
`_sockaddr_len` macro
`_tolower` function
`_tolower` macro
`_toupper` function
`_toupper` macro
`_vms_curses` macro
`_vms_v6_source` macro
`_xopen_source` macro
`_xopen_source_extended`XOPEN_SOURCE_EXTENDED

Compaq CRun-Time Library Reference Manual for OpenVMS Systems