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Copyright 1991 David Jurgens |
MSC: void _hardresume( int result )
MSC: void _hardretn( int error )
MSC: void _harderr( void (far *handler)() )
- prototype in dos.h
- result = return value from handler
- error = number of error
- _harderr() registers a user critical error handler with it's
own error handler which is to be called during a critical error
- handler = new INT 24 handler with the format:
handler(unsigned deverr,unsigned errcode,unsigned far *devhdr)
where: deverr = device error code (AX value DOS passes to INT 24)
errcode = error code (DI value DOS passes to INT 21)
devhdr = pointer to device header on which error occurred
- handler must return via one of three methods:
simple return returns to DOS error handler
_hardresume() returns to DOS error handler
_hardretn() returns to the application
- hardresume() returns one of the following:
_HARDERR_ABORT DOS should abort the process via INT 23
_HARDERR_FAIL DOS should fail the call (DOS 3.x+)
_HARDERR_IGNORE DOS should ignore the error
_HARDERR_RETRY DOS should retry the operation
- due to the complexity of these functions consult the vendor
documentation for more specific details
- Turbo C uses hardretn(), harderr() and hardresume()
- see INT 24
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_harderr |
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