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/* Enable floating-point exceptions.
Copyright (C) 2004 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Aldy Hernandez <aldyh@redhat.com>, 2004.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include "fenv_libc.h"
#include <syscall.h>
#include <sys/prctl.h>
int
feenableexcept (int excepts)
{
unsigned int result = 0, pflags, r;
INTERNAL_SYSCALL_DECL (err);
INTERNAL_SYSCALL (prctl, err, 2, PR_GET_FPEXC, &pflags);
/* Save old enable bits. */
if (pflags & PR_FP_EXC_OVF)
result |= FE_OVERFLOW;
if (pflags & PR_FP_EXC_UND)
result |= FE_UNDERFLOW;
if (pflags & PR_FP_EXC_INV)
result |= FE_INVALID;
if (pflags & PR_FP_EXC_DIV)
result |= FE_DIVBYZERO;
if (pflags & PR_FP_EXC_RES)
result |= FE_INEXACT;
if (excepts & FE_INEXACT)
pflags |= PR_FP_EXC_RES;
if (excepts & FE_DIVBYZERO)
pflags |= PR_FP_EXC_DIV;
if (excepts & FE_UNDERFLOW)
pflags |= PR_FP_EXC_UND;
if (excepts & FE_OVERFLOW)
pflags |= PR_FP_EXC_OVF;
if (excepts & FE_INVALID)
pflags |= PR_FP_EXC_INV;
r = INTERNAL_SYSCALL (prctl, err, 2, PR_SET_FPEXC, pflags);
if (INTERNAL_SYSCALL_ERROR_P (r, err))
return -1;
return result;
}
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