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fetestexcept

Section: Mathematical Library Functions (3M)
Updated: 12 Jul 2006
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NAME

fetestexcept - test floating-point exception flags  

SYNOPSIS

c99 [ flag... ] file... -lm [ library... ]
#include <fenv.h>

int fetestexcept(int excepts);  

DESCRIPTION

The fetestexcept() function determines which of a specified subset of the floating-point exception flags are currently set. The excepts argument specifies the floating-point status flags to be queried.  

RETURN VALUES

The fetestexcept() function returns the value of the bitwise-inclusive OR of the floating-point exception macros corresponding to the currently set floating-point exceptions included in excepts.  

ERRORS

No errors are defined.  

EXAMPLES

Example 1: Example using fetestexcept()

The following example calls function f( ) if an invalid exception is set, and then function g( ) if an overflow exception is set:

#include <fenv.h>
/* ... */
{
#     pragma STDC FENV_ACCESS ON
      int set_excepts;              
      feclearexcept(FE_INVALID | FE_OVERFLOW);
      // maybe raise exceptions
      set_excepts = fetestexcept(FE_INVALID | FE_OVERFLOW);
      if (set_excepts & FE_INVALID) f();
      if (set_excepts & FE_OVERFLOW) g();
      /* ... */
}

 

ATTRIBUTES

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPEATTRIBUTE VALUE
Interface StabilityStandard
MT-LevelMT-Safe

 

SEE ALSO

feclearexcept(3M), fegetexceptflag(3M), fenv.h(3HEAD), attributes(5), standards(5)


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUES
ERRORS
EXAMPLES
ATTRIBUTES
SEE ALSO

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Time: 02:39:33 GMT, October 02, 2010