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52 lines
1.6 KiB
C
52 lines
1.6 KiB
C
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/* Procedure definition for FE_NOMASK_ENV for Linux/ppc.
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Copyright (C) 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <fenv.h>
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#include <errno.h>
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#include <signal.h>
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#include <unistd.h>
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/* This is rather fiddly under Linux. We don't have direct access,
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and there is no system call, but we can change the bits
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in a signal handler's context... */
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static struct sigaction oact;
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static void
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fe_nomask_handler (int signum, struct sigcontext *sc)
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{
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sc->regs->msr |= 0x900ul; /* FE0 | FE1 */
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sigaction (SIGUSR1, &oact, NULL);
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}
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const fenv_t *
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__fe_nomask_env(void)
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{
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struct sigaction act;
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act.sa_handler = (sighandler_t) fe_nomask_handler;
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sigemptyset (&act.sa_mask);
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act.sa_flags = 0;
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sigaction (SIGUSR1, &act, &oact);
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raise (SIGUSR1);
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return FE_ENABLED_ENV;
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}
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