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INT 21 - European MS-DOS 4.0 - SET SIGNAL HANDLER
AH = 8Ch
AL = signal number (see #01793)
BL = action (see #01794)
DS:DX -> signal handler (see #01795)
Return: CF clear if successful
AL = previous action
ES:BX -> previous signal handler
CF set on error
AX = error code (01h,invalid SigNumber or Action)
Desc: set the routine which will be invoked on a number of exceptional
conditions
Allow only SIGHUP (signum = 2), and send it when EOF detected.
This allows to interrupt syscalls with int16.
See dosemu2/dosemu2#1005 (comment)
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INT 21 - European MS-DOS 4.0 - SET SIGNAL HANDLER
AH = 8Ch
AL = signal number (see #01793)
BL = action (see #01794)
DS:DX -> signal handler (see #01795)
Return: CF clear if successful
AL = previous action
ES:BX -> previous signal handler
CF set on error
AX = error code (01h,invalid SigNumber or Action)
Desc: set the routine which will be invoked on a number of exceptional
conditions
Allow only SIGHUP (signum = 2), and send it when EOF detected. This allows to interrupt syscalls with int16.
See dosemu2/dosemu2#1005 (comment)