Which INT 21h function would you call if you wanted to make a file read-only?
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Which INT 21h function would you call if you wanted to make a file read-only?
The INT 21h function, 7143h, is used to make a file read-only.
This function involves the data registers, the accumulator and the carry flag.
The function is explained with an example as follows.
EXAMPLE
The register AX contains the value 7143h.
The register BL contains the action code.
For BL, the action code 00h indicates get attributes and the action code 01h indicates set attributes.
Here, AX is the accumulator.
BL is the lower half of the 16-bit data register and is an 8-bit data register.
EAX, ECX, EDX are the 32-bit data registers.
CF is the carry flag.
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