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

DL_UNBIND_REQ Primitive for X.25


Requests the data link service (DLS) provider to unbind a data link service access point (DLSAP).


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

typedef struct {
   ulong dl_primitive;
} dl_unbind_req_t;


The DL_UNBIND_REQ primitive requests that the DLS provider unbind the DLSAP that had been bound by a previous DL_BIND_REQ primitive. If one or more DLSAPs were bound to the stream with a DL_SUBS_BIND_REQ primitive and have not been unbound with a DL_SUBS_UNBIND_REQ primitive, the DL_UNBIND_REQ primitive unbinds all the subsequent DLSAPs for that stream along with the DLSAP bound with the previous DL_BIND_REQ primitive.

At the successful completion of the request, the DLS user can issue a new DL_BIND_REQ primitive for a potentially new DLSAP.


dl_primitive Specifies the DL_UNBIND_REQ primitive.


Valid The message is valid in the DL_IDLE state.
New The resulting state is DL_UNBIND_PENDING.


Successful The DL_OK_ACK primitive is sent to the DLS user resulting in the DL_UNBOUND state.
Unsuccessful The DL_ERROR_ACK primitive is returned and the resulting state is unchanged.

Error Codes

DL_OUTSTATE    Indicates the primitive was issued from an invalid state.
DL_SYSERR Indicates a system error. The error is specified in the DL_ERROR_ACK primitive.

Implementation Specifics

The DL_UNBIND_REQ primitive is part of X.25 Licensed Program.

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