83 lines
1.7 KiB
C
83 lines
1.7 KiB
C
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/*
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(c) copyright 1988 by the Vrije Universiteit, Amsterdam, The Netherlands.
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See the copyright notice in the ACK home directory, in the file "Copyright".
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*/
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/*
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Module: Mapping of Unix signals to EM traps
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(only when not using the MON instruction)
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Author: Ceriel J.H. Jacobs
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Version: $Header$
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*/
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#if !defined(__em22) && !defined(__em24) && !defined(__em44)
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#define EM_trap(n) TRP(n) /* define to whatever is needed to cause the trap */
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#include <signal.h>
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#include <errno.h>
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int __signo;
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static int __traps[] = {
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-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
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-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
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-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
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};
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static void
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__ctchsig(signo)
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{
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signal(signo,__ctchsig);
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#ifdef __BSD4_2
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sigsetmask(sigblock(0) & ~(1<<(signo - 1)));
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#endif
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__signo = signo;
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EM_trap(__traps[signo]);
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}
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int
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sigtrp(trapno, signo)
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{
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/* Let Unix signal signo cause EM trap trapno to occur.
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If trapno = -2, restore default,
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If trapno = -3, ignore.
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Return old trapnumber.
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Careful, this could be -2 or -3; But return value of -1
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indicates failure, with error number in errno.
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*/
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extern int errno;
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void (*ctch)() = __ctchsig;
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void (*oldctch)();
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int oldtrap;
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if (signo <= 0 || signo >= sizeof(__traps)/sizeof(__traps[0])) {
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errno = EINVAL;
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return -1;
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}
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if (trapno == -3)
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ctch = SIG_IGN;
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else if (trapno == -2)
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ctch = SIG_DFL;
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else if (trapno >= 0 && trapno <= 252)
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;
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else {
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errno = EINVAL;
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return -1;
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}
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oldtrap = __traps[signo];
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if ((oldctch = signal(signo, ctch)) == (void (*)())-1) /* errno set by signal */
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return -1;
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else if (oldctch == SIG_IGN) {
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signal(signo, SIG_IGN);
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}
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else __traps[signo] = trapno;
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return oldtrap;
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}
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#endif
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