HP-UX Reference (11i v3 07/02) - 3 Library Functions A-M (vol 6)

f
feraiseexcept(3M) feraiseexcept(3M)
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 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 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);
SEE ALSO
feclearexcept(3M), fegetexceptflag(3M), fegettrapenable(3M), fesetexceptflag(3M), fesettrapenable(3M),
fetestexcept(3M), fenv(5).
HP-UX 11i Version 3: February 2007 − 1 − Hewlett-Packard Company 429