1 /* Store current floating-point environment and clear exceptions.
3 Copyright (C) 2004-2014 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
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, see
18 <http://www.gnu.org/licenses/>. */
20 #include <fenv_libc.h>
22 #include <sys/prctl.h>
25 feholdexcept (fenv_t *envp)
28 INTERNAL_SYSCALL_DECL (err);
31 /* Get the current state. */
32 r = INTERNAL_SYSCALL (prctl, err, 2, PR_GET_FPEXC, &u.l[0]);
33 if (INTERNAL_SYSCALL_ERROR_P (r, err))
36 u.l[1] = fegetenv_register ();
39 /* Clear everything except for the rounding mode and trapping to the
41 u.l[0] &= ~(PR_FP_EXC_DIV
46 u.l[1] &= SPEFSCR_FRMC | (SPEFSCR_ALL_EXCEPT_ENABLE & ~SPEFSCR_FINXE);
48 /* Put the new state in effect. */
49 fesetenv_register (u.l[1]);
50 r = INTERNAL_SYSCALL (prctl, err, 2, PR_SET_FPEXC,
51 u.l[0] | PR_FP_EXC_SW_ENABLE);
52 if (INTERNAL_SYSCALL_ERROR_P (r, err))
57 libm_hidden_def (feholdexcept)