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Values signal handler is called with

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Data:
AL = signal number (see #01793)
AH = signal argument
Return:
RETF, CF set - terminate process
RETF, CF clear, ZF set - abort any interrupted system call with an error
RETF, CF clear, ZF clear - restart any interrupted system call
IRET - restart any interrupted system call
Notes: The signal handler may also perform a nonlocal GOTO by resetting the stack pointer and jumping; before doing so, it should dismiss the signal by calling this function with BL=04h.