Back to index

glibc  2.9
fesetenv.c
Go to the documentation of this file.
00001 /* Install given floating-point environment.
00002    Copyright (C) 1997, 1999, 2000, 2002 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.h>
00021 #include <shlib-compat.h>
00022 
00023 int
00024 __fesetenv (const fenv_t *envp)
00025 {
00026   fenv_t dummy;
00027 
00028   /* Put these constants in memory explicitly, so as to cope with a
00029      -fPIC bug as of gcc 970624.  Making them automatic is quicker
00030      than loading up the pic register in this instance.  */
00031 
00032   if (envp == FE_DFL_ENV)
00033     {
00034       dummy = 0;
00035       envp = &dummy;
00036     }
00037   else if (envp == FE_NOMASK_ENV)
00038     {
00039       dummy = 0x1f << 23;
00040       envp = &dummy;
00041     }
00042 
00043   __fenv_ldfsr (*envp);
00044 
00045   /* Success.  */
00046   return 0;
00047 }
00048 
00049 #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
00050 strong_alias (__fesetenv, __old_fesetenv)
00051 compat_symbol (libm, __old_fesetenv, fesetenv, GLIBC_2_1);
00052 #endif
00053 
00054 libm_hidden_ver (__fesetenv, fesetenv)
00055 versioned_symbol (libm, __fesetenv, fesetenv, GLIBC_2_2);