Function Code: X'11' Modifiers: X'80' Do not return possible Freviously opened file
Tag Address: Request field which points to a prototype file TAG for the output file,
constructed by the calling line I/O Area Address: Response field which pGints to a virtual page buffer ccntaining an I/O table, a write CCi, and a buffer for processing the output file.
linkid: Request field which specifies the requesting line driver's linkid.
Response post Codes: X'04' Error, file not opened Undefined linkid X'01' previously open file returned
Function Code: X'02' Modifiers: X'80' Do not purge copy or file X'40' Purge all copies, and purge file
Tag Address: Request field which points to the file's active TAG in tMTSYS, as supplied
by open input. I/O Area Address: Unused Unused Response Post Codes: X'04' TAG not found, close failed Function Code: X'12' Modifiers: Unused
Tag Address: Request field which points to a
constructed by the calling line to be set for the output file.
prototype file
This TAG is used
TAG for the output file,
to update the parameters I/O Area Address: Request field which pOints to the file's I/C area, as supplied by open output,. linkid: Unused
Response Post Codes: X'04' I/O area not found, close failed
Appendix C. RSCS Request Elements 301

BUILT BY: FUNCTION: DESCRIPTION: o
4
8 DMTCMX Request line port allocation
This ALERT element is passed via ALERT to the LAX and reserve line ports for links being activated
command.
Length (X'OF') Function I Response Code: X'Ol'l Code Line Address
linkid Onused Unllsed OPERATIONAL NOTES task (DMTLAX) to verify
in response to a START Certain fields are updated during processing. The meanings of the fields follow. ResFonse Codes! X'08' Specified line address not attached (CC=3) X'04' Specified line address not BSC port device type X'02' Line not available
Line Address: Request field specifying requested line address. Zero specification
implies request for allocation of a switchable line from the port table. If
successful, the port's line address is returned in this field as a resFonse.
linkid: Response field specifying the ID of the link that has reserved the particular
requested line address (with response code X'02'). 302 IBM VM/370 Data Areas and Control Block Logic