fesetexceptflag

fesetexceptflag

Set floating point exception flags

Portability: C99

SYNOPSIS
DESCRIPTION
RETURN VALUE
CAUTIONS
RELATED FUNCTIONS
SEE ALSO

SYNOPSIS

   #include <fenv.h>

   void fesetexceptflag(const fexcept_t *flags, int excepts);

DESCRIPTION

fesetexceptflag is used to set the exception flag settings in the current floating-point environment. The excepts argument is the sum of one or more floating-point exception names indicating which flags are to be set. The flags argument addresses the location from which the new settings of the flags should be taken. In normal usage, the memory addressed by flags will have been initialized by a previous call to fegetexceptflag.

For SAS/C, the flags pointer addresses a character which contains the sum of the requested flags which were set in the current environment. If you depend on this format, it will make your program non-portable.

RETURN VALUE

fesetexceptflag has no return value.

CAUTIONS

fesetexceptflag has no effect when called from a function whose default floating-point format is hexadecimal, that is, one compiled without the bfp option.

A program which calls fesetexceptflag must use the standard FENV_ACCESS pragma in an enclosing scope, or the effects are unpredictable.

RELATED FUNCTIONS

feclearexcept, fegetexceptflag, feraiseexcept, fetestexcept

SEE ALSO

"Mathematical Functions" in Chapter 2, "Function Categories"

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