Date: Thu, 18 May 2000 11:28:27 +0300 (IDT)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
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To: djgpp AT delorie DOT com
Subject: Re: Porting from DJGPP C to FreePascal: Problem with signals
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On Wed, 17 May 2000, Bernhard Stiftner wrote:

> old_sig_int  = signal(SIGINT,  signal_handler); /* works OK
> */
> old_sig_kill = signal(SIGKILL, signal_handler); /* error in
> FreePascal exe */
>   /* ... */
> }
> 
> I wonder why all this signal stuff works except for
> SIGKILL...

This is expected behavior: you cannot install a handler for SIGKILL,
and you cannot ignore it (by using SIG_IGN).  This is how Unix systems
behave, and DJGPP follows suit, by returning -1 and setting errno to
EINVAL, like Unix systems do.

It is simply non-portable to call `signal' with SIGKILL and expect
anything but a failure.  Don't do that.