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116 lines
3.5 KiB
C
116 lines
3.5 KiB
C
/*
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* Copyright (c) 1992, 1993, 1996
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* Berkeley Software Design, Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Berkeley Software
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* Design, Inc.
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*
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* THIS SOFTWARE IS PROVIDED BY Berkeley Software Design, Inc. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL Berkeley Software Design, Inc. BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* BSDI signal.c,v 2.2 1996/04/08 19:33:06 bostic Exp
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*
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* $Id: signal.c,v 1.1 1997/08/09 01:42:55 dyson Exp $
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*/
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#include "doscmd.h"
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static void (*handler[NSIG])(struct sigframe *);
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static char signal_stack[16 * 1024];
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#define PSS(w) { char s; printf(w " @ %08x\n", (signal_stack + sizeof signal_stack) - &s); }
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struct sigframe *saved_sigframe;
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regcontext_t *saved_regcontext;
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int saved_valid = 0;
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static void
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sanity_check(struct sigframe *sf)
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{
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#if 0
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static sigset_t oset;
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int i;
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for (i = 1; i < 32; ++i) {
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if (sigismember(&sf->sf_sc.sc_mask, i) != sigismember(&oset, i))
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fprintf(debugf, "Signal %s %s being blocked\n",
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sys_signame[i],
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sigismember(&sf->sf_sc.sc_mask, i) ? "now" : "no longer");
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}
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oset = sf->sf_sc.sc_mask;
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#endif
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if (dead)
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fatal("attempting to return to vm86 while dead");
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}
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#if defined(__FreeBSD__) || defined(USE_VM86)
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static void
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generichandler(struct sigframe sf)
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{
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if (sf.sf_sc.sc_efl & PSL_VM) {
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saved_sigframe = &sf;
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saved_regcontext = (regcontext_t *)&(sf.sf_sc);
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saved_valid = 1;
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if (handler[sf.sf_signum])
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(*handler[sf.sf_signum])(&sf);
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saved_valid = 0;
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sanity_check(&sf);
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} else {
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if (handler[sf.sf_signum])
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(*handler[sf.sf_signum])(&sf);
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}
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}
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#else
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#error BSD/OS sigframe/trapframe kernel interface not currently supported.
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#endif
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void
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setsignal(int s, void (*h)(struct sigframe *))
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{
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static int first = 1;
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struct sigaction sa;
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sigset_t set;
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if (first) {
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struct sigaltstack sstack;
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sstack.ss_sp = signal_stack;
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sstack.ss_size = sizeof signal_stack;
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sstack.ss_flags = 0;
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sigaltstack (&sstack, NULL);
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first = 0;
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}
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if (s >= 0 && s < NSIG) {
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handler[s] = h;
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sa.sa_handler = (__sighandler_t *)generichandler;
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sigemptyset(&sa.sa_mask);
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sigaddset(&sa.sa_mask, SIGIO);
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sigaddset(&sa.sa_mask, SIGALRM);
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sa.sa_flags = SA_ONSTACK;
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sigaction(s, &sa, NULL);
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sigaddset(&set, s);
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sigprocmask(SIG_UNBLOCK, &set, 0);
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}
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}
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