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Appendix C
User-state System Calls
F$DatMod
Create Data Module
ASM Call
OS9 F$DatMod
Input
d0.l
CRC)
d1.w
d2.w
d3.w
d4.l
(a0)
= size of data required (not including header or
=
=
=
=
=
desired attr/revision
desired access permission
desired type/language (optional)
memory color type (optional)
module name string ptr
=
=
=
=
=
module type/language
module attr/revision
updated name string ptr
module data ptr (’execution’ entry)
module header ptr
Output
d0.w
d1.w
(a0)
(a1)
(a2)
Error Output
cc = carry bit set
d1.w = error code if error
Function
F$DatMod creates a data module with the specified attribute/revision and
clears the data portion of the module. The module is initially created with a
valid CRC, and entered into the system module directory. Several
processes can communicate with each other using a shared data module.
Be careful not to modify the data module’s header or name string to avoid
the possibility of the module becoming unknown to the system.
C-16