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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) (see #01680 at AH=59h/BX=0000h)
Desc: Set the routine which will be invoked on a number of exceptional conditions
Note: All signals will be sent to the most recently installed handler
See Also: AH=8Dh
(Table 01793) Values for European MS-DOS 4.0 signal number: 01h SIGINTR Control-C or user defined interrupt key 08h SIGTERM program termination 09h SIGPIPE broken pipe 0Dh SIGUSER1 reserved for user definition 0Eh SIGUSER2 reserved for user definition
(Table 01794) Values for signal action: 00h SIG_DFL terminate process on receipt 01h SIG_IGN ignore signal 02h SIG_GET signal is accepted 03h SIG_ERR sender gets error 04h SIG_ACK acknowledge received signal and clear it, but don't change current setting
(Table 01795) Values signal handler is called with:. 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
Note: 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
Category: DOS Kernel - Int 21h - E
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