HP OpenVMS I/O User’s Reference Manual: OpenVMS Version 8.4 > Appendix A I/O Function Codes

A.7 Fast I/O Function Codes and Modifiers

This section lists the function codes and parameters for the $IO_SETUP system service.

FunctionsArguments

IO$_READVBLK IO$_READLBLK IO$_WRITEVBLK IO$_WRITELBLK

bufobj - user's buffer

iosobj — I/O Status Area (IOSA)

astadr — Completion AST routine

flags — longword mask

return_fandle — fandle address