Modifying entry point routines

The entry point routine set for DDI 8 is significantly different from that used for DDI 7, earlier DDI versions, and SCO OpenServer 5; see ``Entry-point routines''. Intro(D2) includes a table that summarizes the changes, and ``Driver structure'' give an overview of the structure of a DDI 8 driver.

To summarize the major changes in the entry point set beginning with DDI 8:

• The same entry point routines are used for block and character drivers.

• The open(D2) and close(D2) entry point routines have the same syntax and behavior for STREAMS and non-STREAMS drivers.

• The named entry point scheme used for SCO OpenServer 5 and pre-DDI 8 drivers has been replaced by the drvinfo(D4) and drvops(D4) kernel structures that point to the entry point routines.

• DDI entry point routines should return 0 on success. If an error occurs, the entry point should return an error number from those listed on the errnos(D5) manual page rather than setting errors in the u.u_error member. The one exception is the biostart(D2) entry point routine, which does not return anything, but instead sets error information in the b_error member of the buf structure.