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glibc  2.9
fsetexcptflg.c
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00001 /* Set floating-point environment exception handling.
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 #include <bp-sym.h>
00022 
00023 int
00024 __fesetexceptflag (const fexcept_t *flagp, int excepts)
00025 {
00026   fenv_union_t u;
00027   fexcept_t flag;
00028 
00029   /* Get the current state.  */
00030   u.fenv = fegetenv_register ();
00031 
00032   /* Ignore exceptions not listed in 'excepts'.  */
00033   flag = *flagp & excepts;
00034 
00035   /* Replace the exception status */
00036   u.l[1] = ((u.l[1] & ~(FPSCR_STICKY_BITS & excepts))
00037            | (flag & FPSCR_STICKY_BITS)
00038            | (flag >> ((31 - FPSCR_VX) - (31 - FPSCR_VXSOFT))
00039               & FE_INVALID_SOFTWARE));
00040 
00041   /* Store the new status word (along with the rest of the environment).
00042      This may cause floating-point exceptions if the restored state
00043      requests it.  */
00044   fesetenv_register (u.fenv);
00045 
00046   /* Deal with FE_INVALID_SOFTWARE not being implemented on some chips.  */
00047   if (flag & FE_INVALID)
00048     feraiseexcept(FE_INVALID);
00049 
00050   /* Success.  */
00051   return 0;
00052 }
00053 
00054 #include <shlib-compat.h>
00055 #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
00056 strong_alias (__fesetexceptflag, __old_fesetexceptflag)
00057 compat_symbol (libm, BP_SYM (__old_fesetexceptflag), BP_SYM (fesetexceptflag), GLIBC_2_1);
00058 #endif
00059 
00060 versioned_symbol (libm, BP_SYM (__fesetexceptflag), BP_SYM (fesetexceptflag), GLIBC_2_2);