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/* Procedure definition for FE_NOMASK_ENV for Linux/ppc.
Copyright (C) 2000 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <fenv.h>
#include <errno.h>
#include <signal.h>
#include <unistd.h>
/* This is rather fiddly under Linux. We don't have direct access,
and there is no system call, but we can change the bits
in a signal handler's context... */
static struct sigaction oact;
static void
fe_nomask_handler (int signum, struct sigcontext *sc)
{
sc->regs->msr |= 0x900ul; /* FE0 | FE1 */
sigaction (SIGUSR1, &oact, NULL);
}
const fenv_t *
__fe_nomask_env(void)
{
struct sigaction act;
act.sa_handler = (sighandler_t) fe_nomask_handler;
sigemptyset (&act.sa_mask);
act.sa_flags = 0;
sigaction (SIGUSR1, &act, &oact);
raise (SIGUSR1);
return FE_ENABLED_ENV;
}
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