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<TITLE>Int 21/AH=8Ch
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Int 21/AH=8Ch - 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)
(see #01680 at AH=59h/BX=0000h)
">
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<h2>Int 21/AH=8Ch
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<h3><font color=#C00040>European MS-DOS 4.0 - SET SIGNAL HANDLER</font></h3>
<PRE>
AH = 8Ch
AL = signal number <a href="rb-3257.htm#Table1793" tppabs="http://www.ctyme.com/intr/rb-3257.htm#Table1793">(see #01793)</a>
BL = action <a href="rb-3257.htm#Table1794" tppabs="http://www.ctyme.com/intr/rb-3257.htm#Table1794">(see #01794)</a>
DS:DX -> signal handler <a href="rb-3257.htm#Table1795" tppabs="http://www.ctyme.com/intr/rb-3257.htm#Table1795">(see #01795)</a><br>
<p><b>Return:</b><br>CF clear if successful
AL = previous action
ES:BX -> previous signal handler
CF set on error
AX = error code (01h,invalid SigNumber or Action)
<a href="javascript:if(confirm('http://www.ctyme.com/intr/rb-0000.htm \n\nThis file was not retrieved by Teleport Pro, because it was unavailable, or its retrieval was aborted, or the project was stopped too soon. \n\nDo you want to open it from the server?'))window.location='http://www.ctyme.com/intr/rb-0000.htm#Table0'" tppabs="http://www.ctyme.com/intr/rb-0000.htm#Table0"></a>(see #01680 at AH=59h/BX=0000h)
</PRE>
<p><b>Desc:</b>
Set the routine which will be invoked on a number of exceptional
conditions
<p><b>Note:</b>
All signals will be sent to the most recently installed handler
<p><b>See Also:</b>
<a href="rb-3258.htm" tppabs="http://www.ctyme.com/intr/rb-3258.htm">AH=8Dh</a>
<PRE>
<p>
<a name=table1793></a>
(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
<p>
<a name=table1794></a>
(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
<p>
<a name=table1795></a>
(Table 01795)
Values signal handler is called with:.
AL = signal number <a href="rb-3257.htm#Table1793" tppabs="http://www.ctyme.com/intr/rb-3257.htm#Table1793">(see #01793)</a>.
AH = signal argument<br>
<p><b>Return:</b><br>RETF, CF set: terminate process.
<p><b>RETF, CF clear, ZF set:</b><br>Abort any interrupted system call with an error.
<p><b>RETF, CF clear, ZF clear:</b><br>Restart any interrupted system call.
<p><b>IRET:</b><br>Restart any interrupted system call
</PRE>
<p><b>Note:</b>
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
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Int 21h</a>
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