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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; } |