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glibc  2.9
fsetexcptflg.c
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00001 /* Set floating-point environment exception handling.
00002    Copyright (C) 2000 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 <math.h>
00023 #include <fpu_control.h>
00024 
00025 int
00026 fesetexceptflag (const fexcept_t *flagp, int excepts)
00027 {
00028   fexcept_t temp,newexcepts;
00029 
00030   /* Get the current environment.  We have to do this since we cannot
00031      separately set the status word.  */
00032   _FPU_GETCW (temp);
00033   /* Install the new exception bits in the Accrued Exception Byte.  */
00034   excepts = excepts & FE_ALL_EXCEPT;
00035   newexcepts = (excepts << FPC_DXC_SHIFT) | (excepts << FPC_FLAGS_SHIFT);
00036   temp &= ~newexcepts;
00037   temp |= *flagp & newexcepts;
00038 
00039   /* Store the new status word (along with the rest of the environment.
00040      Possibly new exceptions are set but they won't get executed unless
00041      the next floating-point instruction.  */
00042   _FPU_SETCW (temp);
00043 
00044   /* Success.  */
00045   return 0;
00046 }