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AIXLink/X.25 1.1 for AIX: Guide and Reference

DL_ERROR_ACK Primitive for X.25


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


This primitive consists of one M_PROTO message block with the following structure:

typedef struct {
   ulong dl_primitive;
   ulong dl_error_primitive;
   ulong dl_errno;
   ulong dl_unix_errno;
} dl_ok_ack_t;


The DL_ERROR_ACK primitive informs the DLS user that the previously issued request or response was invalid. The primitive identifies the primitive in error, specifies a data link provider interface (DLPI) error code, and if appropriate, indicates an operating system error code.


dl_primitive Specifies the DL_ERROR_ACK primitive.
dl_error_prim 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, it can have the following values:
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_SYSERR Reports operating system failures that prevent the processing of a given request or response.
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.


Valid The message 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 X.25 Licensed Program.

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