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glibc  2.9
feupdateenv.c
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00001 /* Install given floating-point environment and raise exceptions.
00002    Copyright (C) 1997, 1999, 2000, 2008 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
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.h>
00022 #include <fpu_control.h>
00023 
00024 #include <unistd.h>
00025 #include <ldsodefs.h>
00026 #include <dl-procinfo.h>
00027 #include <sysdep.h>
00028 
00029 int
00030 __feupdateenv (const fenv_t *envp)
00031 {
00032   if (GLRO (dl_hwcap) & HWCAP_ARM_VFP)
00033     {
00034       unsigned int temp;
00035 
00036       /* Get the current exception state.  */
00037       _FPU_GETCW (temp);
00038 
00039       /* Install new environment.  */
00040       fesetenv (envp);
00041 
00042       /* Raise the saved exceptions.  */
00043       feraiseexcept (temp & FE_ALL_EXCEPT);
00044 
00045       /* Success.  */
00046       return 0;
00047     }
00048 
00049   /* Unsupported, so fail.  */
00050   return 1;
00051 }
00052 
00053 #include <shlib-compat.h>
00054 #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
00055 strong_alias (__feupdateenv, __old_feupdateenv)
00056 compat_symbol (libm, __old_feupdateenv, feupdateenv, GLIBC_2_1);
00057 #endif
00058 
00059 versioned_symbol (libm, __feupdateenv, feupdateenv, GLIBC_2_2);