Document revision date: 19 July 1999

The SOR$END_SORT routine performs cleanup functions, such as closing files and releasing memory.

Format

SOR$END_SORT [context]

RETURNS

OpenVMS usage:	cond_value
type:	longword (unsigned)
access:	write only
mechanism:	by value

Longword condition value. Most utility routines return a condition value in R0. Condition values that this routine can return are listed under Condition Values Returned.

Argument

context

OpenVMS usage:	context
type:	longword
access:	write only
mechanism:	by reference

Value that distinguishes between multiple, concurrent SORT/MERGE operations. The context argument is the address of a longword containing the context value. When your program makes its first call to a SORT/MERGE routine for a particular sort or merge operation, the context longword must equal zero. SORT/MERGE then stores a value in the longword to identify the operation just initiated. When you make subsequent routine calls for the same operation, you must pass the context value supplied by SORT/MERGE.

Description

The SOR$END_SORT routine ends a sort or merge operation, either at the end of a successful process or between calls because of an error. If an error status is returned, you must call SOR$END_SORT to release all allocated resources. In addition, this routine can be called at any time to close files and release memory.

The value of the optional context argument is cleared when the SOR$END_SORT routine completes its operation.

Some of the following condition values are used with different severities, depending on whether SORT/MERGE can recover. Thus, if you want to check for a specific status, you should use LIB$MATCH_COND.

Condition Values Returned

SS$_NORMAL	Normal successful completion.
SOR$_CLOSEIN	Error closing file as input.
SOR$_CLOSEOUT	Error closing file as output.
SOR$_ENDDIAGS	Completed with diagnostics.
SOR$_END_SORT	SORT/MERGE terminated, context = context.
SOR$_SYSERROR	System service error.

The SOR$PASS_FILES routine passes the names of input and output files and output file characteristics to SORT or MERGE.

Format

SOR$PASS_FILES [inp_desc] [,out_desc] [,org] [,rfm] [,bks] [,bls] [,mrs] [,alq] [,fop] [,fsz] [,context]

RETURNS

OpenVMS usage:	cond_value
type:	longword (unsigned)
access:	write only
mechanism:	by value

Longword condition value. Most utility routines return a condition value in R0. Condition values that this routine can return are listed under Condition Values Returned.

Arguments

inp_desc

OpenVMS usage:	char_string
type:	character-coded text string
access:	read only
mechanism:	by descriptor

Input file specification. The inp_desc argument is the address of a descriptor pointing to the file specification. In the file interface, you must call SOR$PASS_FILES to pass SORT the input file specifications. For multiple input files, call SOR$PASS_FILES once for each input file, passing one input file specification descriptor each time.

In the mixed interface, if you are using the record interface on input, pass only the output file specification; do not pass any input file specifications. If you are using the record interface on output, pass only the input file specifications; do not pass an output file specification or any of the optional output file arguments.

out_desc

OpenVMS usage:	char_string
type:	character-coded text string
access:	read only
mechanism:	by descriptor

Output file specification. The out_desc argument is the address of a descriptor pointing to the file specification. In the file interface, when you call SOR$PASS_FILES, you must pass the output file specification. Specify the output file specification and characteristics only once, as part of the first call, as in the following:

Call SOR$PASS_FILES(Input1,Output) Call SOR$PASS_FILES(Input2) Call SOR$PASS_FILES(Input3)

In the mixed interface, if you are using the record interface on input, pass only the output file specification; do not pass any input file specifications. If you are using the record interface on output, pass only the input file specifications; do not pass an output file specification or any of the optional output file arguments.

org

OpenVMS usage:	byte_unsigned
type:	byte (unsigned)
access:	read only
mechanism:	by reference

File organization of the output file, if different from the input file. The org argument is the address of a byte whose value specifies the organization of the output file; permissible values include the following:

FAB$C_SEQ FAB$C_REL FAB$C_IDX

For the record interface on input, the default value is sequential. For the file interface, the default value is the file organization of the first input file for record or tag sort and sequential for address and index sort.

For more information about OpenVMS RMS file organizations, see the OpenVMS Record Management Services Reference Manual.

rfm

OpenVMS usage:	byte_unsigned
type:	byte (unsigned)
access:	read only
mechanism:	by reference

Record format of the output file, if different from the input file. The rfm argument is the address of a byte whose value specifies the record format of the output file; permissible values include the following:

FAB$C_FIX FAB$C_VAR FAB$C_VFC

For the record interface on input, the default value is variable. For the file interface, the default value is the record format of the first input file for record or tag sort and fixed format for address or index sort. For the mixed interface with record interface on input, the default value is variable format.

For more information about OpenVMS RMS record formats, see the OpenVMS Record Management Services Reference Manual.

bks

OpenVMS usage:	byte_unsigned
type:	byte (unsigned)
access:	read only
mechanism:	by reference

Bucket size of the output file, if different from the first input file. The bks argument is the address of a byte containing this size. Use this argument with relative and indexed-sequential files only. If the bucket size of the output file is to differ from that of the first input file, specify a byte to indicate the bucket size. Acceptable values are from 1 to 32. If you do not pass this argument---and the output file organization is the same as that of the first input file---the bucket size defaults to the value of the first input file. If the file organizations differ or if the record interface is used on input, the default value is 1 block.

bls

OpenVMS usage:	word_unsigned
type:	word (unsigned)
access:	read only
mechanism:	by reference

Block size of a magnetic tape output file. The bls argument is the address of a word containing this size. Use this argument with magnetic tapes only. Permissible values range from 20 to 65,532. However, to ensure compatibility with non-Digital systems, ANSI standards require that the block size be less than or equal to 2048.

The block size defaults to the block size of the input file magnetic tape. If the input file is not on magnetic tape, the output file block size defaults to the size used when the magnetic tape was mounted.

mrs

OpenVMS usage:	word_unsigned
type:	word (unsigned)
access:	read only
mechanism:	by reference

Maximum record size for the output file. The mrs argument is the address of a word specifying this size. Following are acceptable values for each type of file:

File Organization	Acceptable Value
Sequential	0 to 32,767
Relative	0 to 16,383
Indexed sequential	0 to 16,362

If you omit this argument or if you specify a value of 0, SORT does not check maximum record size.

If you do not specify this argument, the default is based on the output file organization and format, unless the organization is relative or the format is fixed. The longest output record length is based on the longest calculated input record length, the type of sort, and the record format.

alq

OpenVMS usage:	longword_unsigned
type:	longword (unsigned)
access:	read only
mechanism:	by reference

Number of preallocated output file blocks. The alq argument is the address of a longword specifying the number of blocks you want to preallocate to the output file. Acceptable values range from 1 to 4,294,967,295.

Pass this argument if you know your output file allocation will be larger or smaller than that of your input files. The default value is the total allocation of all the input files. If the allocation cannot be obtained for any of the input files or if the record interface is used on input, the file allocation defaults to 1000 blocks.

fop

OpenVMS usage:	mask_longword
type:	longword (unsigned)
access:	read only
mechanism:	by reference

File-handling options. The fop argument is the address of a longword whose bit settings determine the options selected. For a list of valid file-handling options, see the description of the FAB$L_FOP field in the OpenVMS Record Management Services Reference Manual. By default, only the DFW (deferred write) option is set. If your output file is indexed, you should set the CIF (create if) option.

fsz

OpenVMS usage:	byte_unsigned
type:	byte (unsigned)
access:	read only
mechanism:	by reference

Size of the fixed portion of VFC records. The fsz argument is the address of a byte containing this size. If you do not pass this argument, the default is the size of the fixed portion of the first input file. If you specify the VFC size as 0, RMS defaults the value to 2 bytes.

context

OpenVMS usage:	context
type:	longword (unsigned)
access:	write only
mechanism:	by reference

Value that distinguishes between multiple concurrent SORT/MERGE operations. The context argument is the address of a longword containing the context value. When your program makes its first call to a SORT/MERGE routine for a particular sort or merge operation, the context longword must equal zero. SORT/MERGE then stores a value in the longword to identify the operation just initiated. When you make subsequent routine calls for the same operation, you must pass the context value supplied by SORT/MERGE.

Description

The SOR$PASS_FILES routine passes input and output file specifications to SORT. The SOR$PASS_FILES routine must be repeated for multiple input files. The output file name string and characteristics should be specified only in the first call to SOR$PASS_FILES.

This routine also accepts optional arguments that specify characteristics for the output file. By default, the output file characteristics are the same as the first input file; specified output file characteristics are used to change these defaults.

Some of the following condition values are used with different severities, depending on whether SORT/MERGE can recover. Thus, if you want to check for a specific status, you should use LIB$MATCH_COND.

Condition Values Returned

SS$_NORMAL	Normal successful completion.
SOR$_DUP_OUTPUT	Output file has already been specified.
SOR$_ENDDIAGS	Completed with diagnostics.
SOR$_INP_FILES	Too many input files specified.
SOR$_NYI	Not yet implemented.
SOR$_SORT_ON	Sort or merge routine called in incorrect order.
SOR$_SYSERROR	System service error.

The SOR$RELEASE_REC routine is used with the record interface to pass one input record to SORT or MERGE.

Format

SOR$RELEASE_REC desc [,context]

RETURNS

OpenVMS usage:	cond_value
type:	longword (unsigned)
access:	write only
mechanism:	by value

Longword condition value. Most utility routines return a condition value in R0. Condition values that this routine can return are listed under Condition Values Returned.

Arguments

desc

OpenVMS usage:	char_string
type:	character-coded text string
access:	read only
mechanism:	by descriptor

Input record buffer. The desc argument is the address of a descriptor pointing to the buffer containing the record to be sorted. If you use the record interface, this argument is required.

context

OpenVMS usage:	context
type:	longword
access:	modify
mechanism:	by reference

Value that distinguishes between multiple, concurrent SORT/MERGE operations. The context argument is the address of a longword containing the context value. When your program makes its first call to a SORT/MERGE routine for a particular sort or merge operation, the context longword must equal zero. SORT/MERGE then stores a value in the longword to identify the operation just initiated. When you make subsequent routine calls for the same operation, you must pass the context value supplied by SORT/MERGE.

Description

Call SOR$RELEASE_REC to pass records to SORT or MERGE with the record interface. SOR$RELEASE_REC must be called once for each record to be sorted.

Some of the following condition values are used with different severities, depending on whether SORT/MERGE can recover. Thus, if you want to check for a specific status, you should use LIB$MATCH_COND.

Condition Values Returned

SS$_NORMAL	Normal successful completion.
SOR$_BADLOGIC	Internal logic error detected.
SOR$_BAD_LRL	Record length n greater than longest specified record length.
SOR$_BAD_SRL	Record length n too short to contain keys.
SOR$_ENDDIAGS	Completed with diagnostics.
SOR$_EXTEND	Unable to extend work file for needed space.
SOR$_MISS_PARAM	The desc argument is missing.
SOR$_NO_WRK	Work files required; cannot do sort in memory as requested.
SOR$_OPENOUT	Error opening file as output.
SOR$_OPERFAIL	Error requesting operator service.
SOR$_READERR	Error reading file.
SOR$_REQ_ALT	Specify alternate name file (or nothing to try again).
SOR$_RTNERROR	Unexpected error status from user-written routine.
SOR$_SORT_ON	Sort or merge routines called in incorrect order.
SOR$_SYSERROR	System service error.
SOR$_USE_ALT	Using alternate file name.
SOR$_WORK_DEV	Work file name must be on random access local device.

The SOR$RETURN_REC routine is used with the record interface to return one sorted or merged record to a program.

Format

SOR$RETURN_REC desc [,length] [,context]

RETURNS

OpenVMS usage:	cond_value
type:	longword (unsigned)
access:	write only
mechanism:	by value

Longword condition value. Most utility routines return a condition value in R0. Condition values that this routine can return are listed under Condition Values Returned.

Arguments

desc

OpenVMS usage:	char_string
type:	character-coded text string
access:	write only
mechanism:	by descriptor

Output record buffer. The desc argument is the address of a descriptor pointing to the buffer that receives the sorted or merged record.

length

OpenVMS usage:	word_unsigned
type:	word (unsigned)
access:	write only
mechanism:	by reference

Length of the output record. The length argument is the address of a word receiving the length of the record returned from SORT/MERGE.

context

OpenVMS usage:	context
type:	longword (unsigned)
access:	modify
mechanism:	by reference

Value that distinguishes between multiple, concurrent SORT/MERGE operations. The context argument is the address of a longword containing the context value. When your program makes its first call to a SORT/MERGE routine for a particular sort or merge operation, the context longword must equal zero. SORT/MERGE then stores a value in the longword to identify the operation just initiated. When you make subsequent routine calls for the same operation, you must pass the context value supplied by SORT/MERGE.

Description

Call the SOR$RETURN_REC routine to release the sorted or merged records to a program. Call this routine once for each record to be returned.

SOR$RETURN_REC places the record into a record buffer that you set up in the program's data area. After SORT has successfully returned all the records to the program, it returns the status code SS$_ENDOFFILE, which indicates that there are no more records to return.

Some of the following condition values are used with different severities, depending on whether SORT/MERGE can recover. Thus, if you want to check for a specific status, you should use LIB$MATCH_COND.

Condition Values Returned

SS$_NORMAL	Normal successful completion.
SOR$_BADLOGIC	Internal logic error detected.
SOR$_ENDDIAGS	Completed with diagnostics.
SOR$_EXTEND	Unable to extend work file for needed space.
SOR$_MISS_PARAM	A required subroutine argument is missing.
SOR$_OPERFAIL	Error requesting operator service.
SOR$_READERR	Error reading file.
SOR$_REQ_ALT	Specify alternate name file (or specify nothing to simply try again).
SOR$_RTNERROR	Unexpected error status from user-written routine.
SOR$_SORT_ON	Sort or merge routines called in incorrect order.
SOR$_SYSERROR	System service error.
SOR$_USE_ALT	Using alternate file name.
SOR$_WORK_DEV	Work file name must be on random access local device.

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