Product Documentation

FairCom ISAM for C

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filmod Values

At file creation and open, the filmod parameter is used to specify the important file characteristics discussed above. Due to the number of different options it is not practical to show you all possible combinations.

When you are asked to supply the filmod parameter you can OR the various options together. For example:

(ctVIRTUAL | ctEXCLUSIVE | ctFIXED)

(ctPERMANENT | ctSHARED | ctFIXED | ctTRNLOG | ctDUPCHANEL)

Certain options are mutually exclusive, so they should not be used together. Only one option should be used from each of the following groups:

ctVIRTUAL or ctPERMANENT

ctEXCLUSIVE or (ctSHARED and/or ctREADFIL)

ctFIXED or ctVLENGTH

ctPREIMG or ctTRNLOG

When creating a data or index file you MUST specify one option from each of the FIRST THREE groups shown above.

Most file modes are applicable to data and index files. The following four exceptions should only be applied to data files:

ctSUPERFILE ctVLENGTH ctCHECKLOCK ctCHECKREAD

The following table defines the values for the file modes. You should always use the defined name for the values if possible. However, you need the numeric values if you are using an ISAM parameter file.

These values can be found in ctport.h.

File mode

Decimal value

Hexadecimal value

ctEXCLUSIVE

0

0x0000

ctSHARED

1

0x0001

ctVIRTUAL

0

0x0000

ctPERMANENT

2

0x0002

ctFIXED

0

0x0000

ctVLENGTH

4

0x0004

ctREADFIL

8

0x0008

ctPREIMG

16

0x0010

ctTRNLOG

48

0x0030

ctWRITETHRU

64

0x0040

ctCHECKLOCK

128

0x0080

ctDUPCHANEL

256

0x0100

ctSUPERFILE

512

0x0200

ctCHECKREAD

1024

0x0400

ctDISABLERES

2048

0x0800

ctMIRROR_SKP

8192

0x2000

ctOPENCRPT

16384

0x4000

ctLOGIDX

32768

0x8000

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