Technical Reference: Communications, Volume 1

DL_ERROR_ACK Primitive

Purpose

Informs the data link service (DLS) user that a request or response was invalid.

The message consists of one M_PCPROTO message block, which contains the following structure:
typedef struct { ulong dl_primitive; ulong dl_error_primitive; ulong dl_errno; ulong dl_unix_errno; } dl_ok_ack_t;

This structure is defined in /usr/include/sys/dlpi.h.

Description

The DL_ERROR_ACK primitive informs the DLS user that the previously issued request or response was invalid. This primitive identifies the primitive in error, specifies a Data Link Provider Interface (DLPI) error code, and if appropriate, indicates an operating system error code.

Parameters

dl_primitive	Specifies the DL_ERROR_ACK primitive.
dl_error_primitive	Identifies the primitive that caused the error.
dl_errno	Specifies the DLPI error code associated with the failure. See the individual request or response for the error codes that are applicable. In addition to those errors: DL_BADPRIM Indicates an unrecognized primitive was issued by the DLS user. DL_NOTSUPPORTED Indicates an unsupported primitive was issued by the DLS user.
dl_unix_errno	Specifies the operating system error code associated with the failure. This value should be nonzero only when the dl_errno parameter is set to DL_SYSERR. It is used to report operating system failures that prevent the processing of a given request or response.

States

Valid	The primitive is valid in all states that have a pending acknowledgment or confirmation.
New	The resulting state is the same as the one from which the acknowledged request or response was generated.

Implementation Specifics

This primitive is part of Base Operating System (BOS) Runtime.

Related Information

The DL_OK_ACK primitive.