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glibc  2.9
fclrexcpt.c
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00001 /* Clear given exceptions in current floating-point environment.
00002    Copyright (C) 1997,99,2000,01 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #include <fenv_libc.h>
00021 
00022 #undef feclearexcept
00023 int
00024 __feclearexcept (int excepts)
00025 {
00026   fenv_union_t u;
00027 
00028   /* Get the current state.  */
00029   u.fenv = fegetenv_register ();
00030 
00031   /* Clear the relevant bits.  */
00032   u.l[1] = u.l[1] & ~((-(excepts >> (31 - FPSCR_VX) & 1) & FE_ALL_INVALID)
00033                     | (excepts & FPSCR_STICKY_BITS));
00034 
00035   /* Put the new state in effect.  */
00036   fesetenv_register (u.fenv);
00037 
00038   /* Success.  */
00039   return 0;
00040 }
00041 
00042 #include <shlib-compat.h>
00043 #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
00044 strong_alias (__feclearexcept, __old_feclearexcept)
00045 compat_symbol (libm, __old_feclearexcept, feclearexcept, GLIBC_2_1);
00046 #endif
00047 
00048 versioned_symbol (libm, __feclearexcept, feclearexcept, GLIBC_2_2);