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/* Install given floating-point environment and raise 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, see
<http://www.gnu.org/licenses/>. */
#include "fenv_libc.h"
#include <syscall.h>
#include <sys/prctl.h>
int
__feupdateenv (const fenv_t *envp)
{
unsigned long fpescr, old, new, pflags;
fenv_union_t u;
INTERNAL_SYSCALL_DECL (err);
/* Save the currently set exceptions. */
u.fenv = *envp;
new = u.l[1];
old = fegetenv_register ();
new |= (old & FE_ALL_EXCEPT);
INTERNAL_SYSCALL (prctl, err, 2, PR_GET_FPEXC, &pflags);
pflags |= u.l[0];
INTERNAL_SYSCALL (prctl, err, 2, PR_SET_FPEXC, pflags);
/* Enable and raise (if appropriate) exceptions set in `new'. */
fesetenv_register (new);
feraiseexcept (new & FE_ALL_EXCEPT);
/* Success. */
return 0;
}
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