123 lines
3.5 KiB
C
123 lines
3.5 KiB
C
/* $NetBSD: except.c,v 1.5 2002/02/21 07:38:16 itojun Exp $ */
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/*-
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* Copyright (c) 1995 The NetBSD Foundation, Inc.
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* 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 the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdio.h>
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#include <signal.h>
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#include <assert.h>
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#include <ieeefp.h>
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#include <float.h>
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void sigfpe();
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volatile sig_atomic_t signal_caught;
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static volatile const double one = 1.0;
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static volatile const double zero = 0.0;
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static volatile const double huge = DBL_MAX;
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static volatile const double tiny = DBL_MIN;
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main()
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{
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volatile double x;
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/*
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* check to make sure that all exceptions are masked and
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* that the accumulated exception status is clear.
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*/
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assert(fpgetmask() == 0);
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assert(fpgetsticky() == 0);
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/* set up signal handler */
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signal (SIGFPE, sigfpe);
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signal_caught = 0;
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/* trip divide by zero */
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x = one / zero;
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assert (fpgetsticky() & FP_X_DZ);
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assert (signal_caught == 0);
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fpsetsticky(0);
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/* trip invalid operation */
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x = zero / zero;
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assert (fpgetsticky() & FP_X_INV);
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assert (signal_caught == 0);
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fpsetsticky(0);
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/* trip overflow */
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x = huge * huge;
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assert (fpgetsticky() & FP_X_OFL);
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assert (signal_caught == 0);
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fpsetsticky(0);
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/* trip underflow */
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x = tiny * tiny;
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assert (fpgetsticky() & FP_X_UFL);
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assert (signal_caught == 0);
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fpsetsticky(0);
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#if 1
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/* unmask and then trip divide by zero */
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fpsetmask(FP_X_DZ);
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x = one / zero;
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assert (signal_caught == 1);
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signal_caught = 0;
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/* unmask and then trip invalid operation */
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fpsetmask(FP_X_INV);
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x = zero / zero;
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assert (signal_caught == 1);
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signal_caught = 0;
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/* unmask and then trip overflow */
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fpsetmask(FP_X_OFL);
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x = huge * huge;
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assert (signal_caught == 1);
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signal_caught = 0;
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/* unmask and then trip underflow */
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fpsetmask(FP_X_UFL);
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x = tiny * tiny;
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assert (signal_caught == 1);
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signal_caught = 0;
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#endif
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exit(0);
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}
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void
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sigfpe()
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{
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signal_caught = 1;
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}
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