Flag D

Flag D_OLD

The D_OLD flag exists only to retain compatibility with certain drivers written originally for IRIX 4.x. It changes two features of the kernel-to-driver interface:

The first argument to the pfxopen() entry is a dev_t value instead of the pointer-to-dev_t that is now standard.
The driver sets its return code by storing it into a global, u.u_error, instead of returning it as the result of the function call.

D_OLD is incompatible with D_MP.

When a driver has no pfxdevflag constant, lboot assumes it is a D_OLD driver.

Note: The D_OLD flag value, and the incompatible interface that it implies, is supported for compatiblity only. Support for this flag, and support for drivers that use it (or that have no pfxdevflag constant), will be withdrawn in the release of IRIX after 6.2. It may be removed from certain platform-specific releases of IRIX 6.2. Silicon Graphics urges you to revise any driver that depends on D_OLD to use current semantics for parameters and return codes.