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glibc  2.9
feholdexcpt.c
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00001 /* Store current floating-point environment and clear exceptions.
00002    Copyright (C) 2000, 2005, 2007 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004    Contributed by Denis Joseph Barrow (djbarrow@de.ibm.com).
00005 
00006    The GNU C Library is free software; you can redistribute it and/or
00007    modify it under the terms of the GNU Lesser General Public
00008    License as published by the Free Software Foundation; either
00009    version 2.1 of the License, or (at your option) any later version.
00010 
00011    The GNU C Library is distributed in the hope that it will be useful,
00012    but WITHOUT ANY WARRANTY; without even the implied warranty of
00013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014    Lesser General Public License for more details.
00015 
00016    You should have received a copy of the GNU Lesser General Public
00017    License along with the GNU C Library; if not, write to the Free
00018    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00019    02111-1307 USA.  */
00020 
00021 #include <fenv_libc.h>
00022 #include <fpu_control.h>
00023 
00024 int feholdexcept (fenv_t *envp)
00025 {
00026   fexcept_t fpc;
00027   /* Store the environment.  */
00028   fegetenv (envp);
00029   /* Clear the current sticky bits as more than one exception
00030      may be generated.  */
00031   fpc = envp->fpc & ~(FPC_FLAGS_MASK | FPC_DXC_MASK);
00032   /* Hold from generating fpu exceptions temporarily.  */
00033   _FPU_SETCW ((fpc & ~(FE_ALL_EXCEPT << FPC_EXCEPTION_MASK_SHIFT)));
00034   return 0;
00035 }
00036 libm_hidden_def (feholdexcept)