HP-UX Reference (11i v2 07/12) - 3 Library Functions A-M (vol 6)

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fesettrapenable(3M) fesettrapenable(3M)

NAME

fesettrapenable( ) - set exception trap enables

SYNOPSIS

#include <fenv.h>

void fesettrapenable(int excepts);

DESCRIPTION

The fesettrapenable()

function enables the exception traps indicated by the argument excepts and

disables the exception traps not indicated by the argument. The argument can be constructed as a bitwise

OR of the exception macros:

FE_INEXACT , FE_DIVBYZERO

, FE_UNDERFLOW , FE_OVERFLOW , and

FE_INVALID . FE_ALL_EXCEPT

represents all the exceptions.

USAGE

To use this function, compile either with the default

-Ae option or with the -Aa and -D_HPUX_SOURCE

options. Make sure your program includes <fenv.h>

For Itanium(R)-based systems, specify

+Ofenvaccess on the compiler command line or place the call to

this function under the effect of an afﬁrmative

FENV_ACCESS pragma:

#pragma STDC FENV_ACCESS ON

If the FENV_ACCESS pragma is placed outside of any top-level declarations in a ﬁle, the pragma will

apply to all declarations in the compilation following the pragma until another FENV_ACCESS pragma is

encountered or until the end of the ﬁle is reached.

If the FENV_ACCESS pragma is placed at the beginning of a block (compound statement), the pragma will

apply until another FENV_ACCESS pragma is encountered or until the end of the block is reached.

For PA-RISC, you might need to use the

+Onomoveflops compiler option in order to prevent optimiza-

tions that can undermine the speciﬁed behavior of this function.

Link in the math library by specifying

-lm on the compiler or linker command line.

For more information, see the HP-UX Floating-Point Guide.

RETURN VALUE

None.

ERRORS

No errors are deﬁned.

EXAMPLES

Enable overﬂow and divide by zero traps and disable the others

#include <fenv.h>

/*...*/

fesettrapenable(FE_OVERFLOW | FE_DIVBYZERO);

AUTHOR

fesettrapenable() was developed by HP and is not required by any current standard.