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glibc  2.9
fegetenv.c
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00001 /* Store current floating-point environment.
00002    Copyright (C) 1997,1999,2000,2001,2003 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 <bp-sym.h>
00023 
00024 int
00025 __fegetenv (fenv_t *envp)
00026 {
00027   __asm__ ("fnstenv %0" : "=m" (*envp));
00028   /* And load it right back since the processor changes the mask.
00029      Intel thought this opcode to be used in interrupt handlers which
00030      would block all exceptions.  */
00031   __asm__ ("fldenv %0" : : "m" (*envp));
00032 
00033   /* Success.  */
00034   return 0;
00035 }
00036 
00037 #include <shlib-compat.h>
00038 #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
00039 strong_alias (__fegetenv, __old_fegetenv)
00040 compat_symbol (libm, BP_SYM (__old_fegetenv), BP_SYM (fegetenv), GLIBC_2_1);
00041 #endif
00042 
00043 versioned_symbol (libm, BP_SYM (__fegetenv), BP_SYM (fegetenv), GLIBC_2_2);