1 /* Enable floating-point exceptions.
2 Copyright (C) 2004 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Aldy Hernandez <aldyh@redhat.com>, 2004.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
21 #include "fenv_libc.h"
23 #include <sys/prctl.h>
26 feenableexcept (int excepts)
28 unsigned int result = 0, pflags, r;
29 INTERNAL_SYSCALL_DECL (err);
31 INTERNAL_SYSCALL (prctl, err, 2, PR_GET_FPEXC, &pflags);
33 /* Save old enable bits. */
34 if (pflags & PR_FP_EXC_OVF)
35 result |= FE_OVERFLOW;
36 if (pflags & PR_FP_EXC_UND)
37 result |= FE_UNDERFLOW;
38 if (pflags & PR_FP_EXC_INV)
40 if (pflags & PR_FP_EXC_DIV)
41 result |= FE_DIVBYZERO;
42 if (pflags & PR_FP_EXC_RES)
45 if (excepts & FE_INEXACT)
46 pflags |= PR_FP_EXC_RES;
47 if (excepts & FE_DIVBYZERO)
48 pflags |= PR_FP_EXC_DIV;
49 if (excepts & FE_UNDERFLOW)
50 pflags |= PR_FP_EXC_UND;
51 if (excepts & FE_OVERFLOW)
52 pflags |= PR_FP_EXC_OVF;
53 if (excepts & FE_INVALID)
54 pflags |= PR_FP_EXC_INV;
55 r = INTERNAL_SYSCALL (prctl, err, 2, PR_SET_FPEXC, pflags);
56 if (INTERNAL_SYSCALL_ERROR_P (r, err))