feupdateenv(3p) - phpMan

FEUPDATEENV(P)                                                  FEUPDATEENV(P)



NAME
       feupdateenv - update floating-point environment

SYNOPSIS
       #include <fenv.h>

       int feupdateenv(const fenv_t *envp);


DESCRIPTION
       The  feupdateenv()  function  shall  attempt to save the currently raised floating-
       point exceptions in its automatic storage, attempt to  install  the  floating-point
       environment represented by the object pointed to by envp, and then attempt to raise
       the saved floating-point exceptions. The argument envp shall point to an object set
       by  a  call  to feholdexcept() or fegetenv(), or equal a floating-point environment
       macro.

RETURN VALUE
       The feupdateenv() function shall return a  zero  value  if  and  only  if  all  the
       required actions were successfully carried out.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       The  following  example shows sample code to hide spurious underflow floating-point
       exceptions:


              #include <fenv.h>
              double f(double x)
              {
                  #pragma STDC FENV_ACCESS ON
                  double result;
                  fenv_t save_env;
                  feholdexcept(&save_env);
                  // compute result
                  if (/* test spurious underflow */)
                  feclearexcept(FE_UNDERFLOW);
                  feupdateenv(&save_env);
                  return result;
              }

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       fegetenv() , feholdexcept() , the Base Definitions volume of  IEEE Std 1003.1-2001,
       <fenv.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std
       1003.1, 2003 Edition, Standard for Information  Technology  --  Portable  Operating
       System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C)
       2001-2003 by the Institute of Electrical and Electronics  Engineers,  Inc  and  The
       Open  Group.  In the event of any discrepancy between this version and the original
       IEEE and The Open Group Standard, the original IEEE and The Open Group Standard  is
       the   referee   document.   The   original  Standard  can  be  obtained  online  at
       http://www.opengroup.org/unix/online.html .



POSIX                                2003                       FEUPDATEENV(P)

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