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AIX Version 4.3 Communications Technical Reference, Volume 1
write Subroutine Extended Parameters for DLC
Provide generic data link control (GDLC) with data types, service access points (SAPs), and link station (LS) correlators.
An extended write or writex subroutine must be issued by an application or kernel user to provide GDLC with data types, SAPs, and LS correlators.
|| Specifies the GDLC SAP correlator of the write data. This field must contain the same correlator value passed back form GDLC in the gdlc_sap_corr
field when the SAP was enabled.|
|| Not used for writes.|
|| Specifies the GDLC LS correlator of the write data. This field must contain the same correlator value passed back from GDLC in the gdlc_ls_corr
field when the LS was started.|
|| Specifies flags for the writex subroutine. The following flags are supported:
|| Requests a sequenced data class of information to be sent (generally called I-frames).
This request is valid any time the target link station has been started and contacted.
|| Requests an exchange identification (XID) non-sequenced command or response packet to be sent.
This request is valid any time the target link station has been started with the following rules:
GDLC sends the XID as a command as long as no DLC_TEST, DLC_CONTACT, DLC_HALT_LS, or DLC_XIDD write subroutine is already in progress, and no received XID is waiting for a response. If a received XID is waiting for a response, GDLC automatically sends the write XID as that response. If no response is pending and a command is already in progress, the write is rejected by GDLC.
|| Requests a datagram packet to be sent. A datagram is an unnumbered information (UI) response.
This request is valid any time the target link station has been started.
|| Requests that network data be sent.
Examples of network data include special modem control data or user-generated medium access control (MAC) and logical link control (LLC) headers.
Network data must contain the entire MAC layer packet headers so that the packet can be sent without the data link control (DLC)'s intervention. GDLC only provides a pass-through function for this type of write.
This request is valid any time the SAP is open.
These DLC extended parameters for the write subroutine are part of the data link control in BOS Extensions 2 for the device manager you are using.
The write or writex subroutine.
List of Kernel Routines for DLC.
read Subroutine Extended Parameters for DLC.
Generic Data Link Control (GDLC) Environment Overview in AIX Version 4.3 Communications Programming Concepts.
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