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feraiseexcept(3M)

HP-UX 11i Version 3: February 2007
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NAME

feraiseexcept() — raise floating-point exceptions

SYNOPSIS

#include <fenv.h>

HP Integrity Server Only

int feraiseexcept(int excepts);

PA-RISC Only

void feraiseexcept(int excepts);

DESCRIPTION

The feraiseexcept() function raises the floating-point exceptions represented by its 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.

Any traps enabled for the specified exceptions will be taken.

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 Integrity servers, 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 optimizations 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 for HP Integrity servers at the following site: http://www.hp.com/go/fp.

RETURN VALUE

Integrity Server Only

This function always returns 0, indicating that all the specified exceptions were successfully raised.

PA-RISC Only

None.

ERRORS

No errors are defined.

EXAMPLES

Raise the underflow and inexact exceptions:

#include <fenv.h> /*...*/ feraiseexcept(FE_UNDERFLOW | FE_INEXACT);

Raise all exceptions:

#include <fenv.h> /*...*/ feraiseexcept(FE_ALL_EXCEPT);

STANDARDS CONFORMANCE

feraiseexcept() : ISO/IEC C99 (including Annex F, "IEC 60559 floating-point arithmetic")

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