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| Document revision date: 19 July 1999 | |
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This section describes the individual FDL routines.
Note that the fdl_desc and the default_fdl_desc arguments that are used as part of these routine calls are character strings that can be either of the following:
For additional details, see the descriptions of the individual routine calls.
The FDL$CREATE routine creates a file from an FDL specification and then closes the file.
FDL$CREATE fdl_desc [,filename] [,default_name] [,result_name] [,fid_block] [,flags] [,stmnt_num] [,retlen] [,sts] [,stv] [,default_fdl_desc]
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.
fdl_desc
OpenVMS usage: char_string type: character-coded text string access: read only mechanism: by descriptor---fixed-length string descriptor
The fdl_desc argument is one of the following:The choice depends on the application making the call. For example, if the application wants to create data files that are compatible with a PC application, it might create the following FDL file and name it TRANSFER.FDL:
- A character string descriptor pointing to a file containing the FDL specification to be parsed
- A character string containing the actual FDL specification
The application could then include the address of the FDL file as the fdl_desc argument to the FDL$PARSE call:
FILE ORGANIZATION sequential RECORD FORMAT stream_lf
Optionally, the application might code the FDL specification itself into the call using a quoted character string as the fdl_desc argument:
call fdl$parse transfer.fdl ,...
call fdl$parse "FILE; ORG SEQ; FORMAT STREAM_LF;" ,...Note that directly including the FDL specification into the call requires you to do the following:
- Enclose the fdl_desc argument in quotation marks
- Use a semicolon to delimit statements within the fdl_desc argument
- Assign the symbol FDL$M_FDL_STRING as the flags mask value
filename
OpenVMS usage: char_string type: character-coded text string access: read only mechanism: by descriptor---fixed-length string descriptor
Name of the OpenVMS RMS file to be created using the FDL specification. The filename argument is the address of a character string descriptor pointing to the RMS file name. This name overrides the default_name parameter given in the FDL specification.default_name
OpenVMS usage: char_string type: character-coded text string access: read only mechanism: by descriptor---fixed-length string descriptor
Default name of the file to be created using the FDL specification. The default_name argument is the address of a character string descriptor pointing to the default file name. This name overrides any name given in the FDL specification.result_name
OpenVMS usage: char_string type: character-coded text string access: write only mechanism: by descriptor---fixed-length string descriptor
Resultant name of the file created by FDL$CREATE. The result_name argument is the address of a character string descriptor that receives the resultant file name.fid_block
OpenVMS usage: vector_longword_unsigned type: longword (unsigned) access: write only mechanism: by reference
File identification of the RMS file created by FDL$CREATE. The fid_block argument is the address of an array of longwords that receives the RMS file identification information. The first longword contains the FID_NUM, the second contains the FID_SEQ, and the third contains the FID_RVN. They have the following definitions:
FID_NUM The location of the file on the disk. Its value can range from 1 up to the number of files the disk can hold. FID_SEQ The file sequence number, which is the number of times the file number has been used. FID_RVN The relative volume number, which is the volume number of the volume on which the file is stored. If the file is not stored on a volume set, the relative volume number is 0. flags
OpenVMS usage: mask_longword type: longword (unsigned) access: read only mechanism: by reference
Flags (or masks) that control how the fdl_desc argument is interpreted and how errors are signaled. The flags argument is the address of a longword containing the control flags (or a mask). If you omit this argument or specify it as 0, no flags are set. The following table shows the flags and their meanings:
Flag Function FDL$V_FDL_STRING Interprets the fdl_desc argument as an FDL specification in string form. By default, the fdl_desc argument is interpreted as the file name of an FDL file. FDL$V_LONG_NAMES Returns the RESULT_NAME using the long result name from a long name access block (NAML). By default, the RESULT_NAME is returned from the short fields of a name access block (NAM) and thus may have a generated specification. This flag is valid for OpenVMS Alpha only.
FDL$V_SIGNAL Signals any error. By default, the status code is returned to the calling image. By default, an error status is returned rather than signaled.
stmnt_num
OpenVMS usage: longword_unsigned type: longword (unsigned) access: write only mechanism: by reference
FDL statement number. The stmnt_num argument is the address of a longword that receives the FDL statement number. If the routine finishes successfully, the stmnt_num argument is the number of statements in the FDL specification. If the routine does not finish successfully, the stmnt_num argument receives the number of the statement that caused the error. Note that line numbers and statement numbers are not the same and that an FDL specification in string form has no "lines."retlen
OpenVMS usage: longword_unsigned type: longword (unsigned) access: write only mechanism: by reference
Number of characters returned in the result_name argument. The retlen argument is the address of a longword that receives this number.sts
OpenVMS usage: longword_unsigned type: longword_unsigned access: write only mechanism: by reference
RMS status value FAB$L_STS. The sts argument is the address of a longword that receives the status value FAB$L_STS from the $CREATE system service.stv
OpenVMS usage: longword_unsigned type: longword (unsigned) access: write only mechanism: by reference
RMS status value FAB$L_STV. The stv argument is the address of a longword that receives the status value FAB$L_STV from the $CREATE system service.default_fdl_desc
OpenVMS usage: char_string type: character-coded text string access: read only mechanism: by descriptor---fixed-length string descriptor
The default_fdl_desc argument is one of the following:
- A character string descriptor pointing to a file containing the default FDL specification to be parsed
- A character string containing the actual default FDL specification
See the description of the fdl_desc argument for details.
This argument allows you to specify default FDL attributes. In other words, FDL$CREATE processes the attributes specified in this argument unless you override them with the attributes you specify in the fdl_desc argument.
You can code the FDL defaults directly into your program, typically with an FDL specification in string form.
FDL$CREATE calls the FDL$PARSE routine to parse the FDL specification. The FDL specification can be in a file or a character string.
Source of FDL Specification Advantages Disadvantages FDL file Variability; for example, if the specification changes regularly, you can revise the file without revising the calling program. File must be in default directory.
Slower.Character string You do not have to be concerned with locating a file. Program must be recoded to change FDL specification. Faster access. If the FDL specification is relatively simple and is not going to change, put the FDL specification in a character string as the fdl_desc argument to the call.
FDL$CREATE opens (creates) the specified RMS file and then closes it without putting any data in it.
FDL$CREATE does not create the output file if an error status is either returned or signaled.
SS$_NORMAL Normal successful completion. FDL$_ABKW Ambiguous keyword in statement number<CRLF> reference-text. FDL$_ABPRIKW Ambiguous primary keyword in statement number<CRLF> reference-text. FDL$_BADLOGIC Internal logic error detected. FDL$_CLOSEIN Error closing filename as input. FDL$_CLOSEOUT Error closing filename as output. FDL$_CREATE Error creating filename. FDL$_CREATED Filename created. FDL$_CREATED_STM Filename created in stream format. FDL$_FDLERROR Error parsing FDL file. FDL$_ILL_ARG Wrong number of arguments. FDL$_INSVIREM Insufficient virtual memory. FDL$_INVBLK Invalid RMS control block at virtual address 'hex-offset'. FDL$_MULPRI Multiple primary definition in statement number. FDL$_OPENFDL Error opening filename. FDL$_OPENIN Error opening filename as input. FDL$_OPENOUT Error opening filename as output. FDL$_OUTORDER Key or area primary defined out of order in statement number. FDL$_READERR Error reading filename. FDL$_RFLOC Unable to locate related file. FDL$_SYNTAX Syntax error in statement number reference-text. FDL$_UNPRIKW Unrecognized primary keyword in statement number<CRLF> reference-text. FDL$_UNQUAKW Unrecognized qualifier keyword in statement number<CRLF> reference-text. FDL$_UNSECKW Unrecognized secondary keyword in statement number<CRLF> reference-text. FDL$_VALERR Specified value is out of legal range. FDL$_VALPRI Value required on primary in statement number. FDL$_WARNING Parsed with warnings. FDL$_WRITEERR Error writing filename. RMS$_ACT File activity precludes operation. RMS$_CRE Ancillary control process (ACP) file create failed. RMS$_CREATED File was created, not opened. RMS$_DNF Directory not found. RMS$_DNR Device not ready or not mounted. RMS$_EXP File expiration date not yet reached. RMS$_FEX File already exists, not superseded. RMS$_FLK File currently locked by another user. RMS$_PRV Insufficient privilege or file protection violation. RMS$_SUPERSEDE Created file superseded existing version. RMS$_WLK Device currently write locked.
The FDL$GENERATE routine produces an FDL specification and writes it to either an FDL file or a character string.
FDL$GENERATE flags ,fab_pointer ,rab_pointer [,fdl_file_dst] [,fdl_file_resnam] [,fdl_str_dst] [,bad_blk_addr] [,retlen]
OpenVMS usage: cond_value type: longword (unsigned) access: write only mechanism: by value
Longword condition value. Most utility routines return a condition value in R0. Condition values that this routine can return are listed under Condition Values Returned.
flags
OpenVMS usage: mask_longword type: longword (unsigned) access: read only mechanism: by reference
Flags (or masks) that control how the fdl_str_dst argument is interpreted and how errors are signaled. The flags argument is the address of a longword containing the control flags (or a mask). If you omit this argument or specify it as zero, no flags are set. The flags and their meanings are as follows:
Flag Function FDL$V_FDL_STRING Interprets the fdl_str_dst argument as an FDL specification in string form. By default, the fdl_str_dst argument is interpreted as the file name of an FDL file. FDL$V_FULL_OUTPUT Includes the FDL attributes to describe all the bits and fields in the OpenVMS RMS control blocks, including run-time options. If this flag is set, every field is inspected before being written. By default, only the FDL attributes that describe permanent file attributes are included (producing a much shorter FDL specification). FDL$V_LONG_NAMES Returns the FDL_FILE_RESNAME using the long result name from a long name access block (NAML). By default, the FDL_FILE_RESNAM is returned from the short fields of a name access block (NAM) and thus may have a generated specification. This flag is valid for OpenVMS Alpha only.
FDL$V_SIGNAL Signals any error. By default, the status code is returned to the calling image. By default, an error status is returned rather than signaled.
fab_pointer
OpenVMS usage: address type: longword (unsigned) access: read only mechanism: by reference
RMS file access block (FAB). The fab_pointer argument is the address of a longword containing the address of a FAB.rab_pointer
OpenVMS usage: address type: longword (unsigned) access: read only mechanism: by reference
RMS record access block (RAB). The rab_pointer argument is the address of a longword containing the address of a RAB.fdl_file_dst
OpenVMS usage: char_string type: character-coded text string access: read only mechanism: by descriptor
Name of the FDL file to be created. The fdl_file_dst argument is the address of a character-string descriptor containing the file name of the FDL file to be created. If the FDL$V_FDL_STRING flag is set in the flags argument, this argument is ignored; otherwise, it is required. The FDL specification is written to the file named in this argument.fdl_file_resnam
OpenVMS usage: char_string type: character-coded text string access: write only mechanism: by descriptor---fixed-length string descriptor
Resultant name of the FDL file created. The fdl_file_resnam argument is the address of a variable character-string descriptor that receives the resultant name of the FDL file created (if FDL$GENERATE is directed to create an FDL file).fdl_str_dst
OpenVMS usage: char_string type: character-coded text string access: write only mechanism: by descriptor---fixed-length string descriptor
FDL specification. The fdl_str_dst argument is the address of a variable character string descriptor that receives the FDL specification created. If the FDL$V_FDL_STRING bit is set in the flags argument, this argument is required; otherwise, it is ignored.
bad_blk_addr
OpenVMS usage: address type: longword (unsigned) access: write only mechanism: by reference
Address of an invalid RMS control block. The bad_blk_addr argument is the address of a longword that receives the address of an invalid control block (a fatal error). If an invalid control block is detected, this argument is returned; otherwise, it is ignored.retlen
OpenVMS usage: longword_unsigned type: longword (unsigned) access: write only mechanism: by reference
Number of characters received in either the fdl_file_resnam or the fdl_str_dst argument. The retlen argument is the address of a longword that receives this number.
SS$_NORMAL Normal successful completion. FDL$_INVBLK Invalid block. RMS$_ACT File activity precludes operation. RMS$_CONTROLC Operation completed under Ctrl/C. RMS$_CONTROLO Output completed under Ctrl/O. RMS$_CONTROLY Operation completed under Ctrl/Y. RMS$_DNR Device not ready or mounted. RMS$_EXT ACP file extend failed. RMS$_OK_ALK Record already locked. RMS$_OK_DUP Record inserted had duplicate key. RMS$_OK_IDX Index update error occurred. RMS$_PENDING Asynchronous operation pending completion. RMS$_PRV Insufficient privilege or file protection violation. RMS$_REX Record already exists. RMS$_RLK Target record currently locked by another stream. RMS$_RSA Record stream currently active. RMS$_WLK Device currently write locked. SS$_ACCVIO Access violation. STR$_FATINERR Fatal internal error in run-time library. STR$_ILLSTRCLA Illegal string class. STR$_INSVIRMEM Insufficient virtual memory.
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