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 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.
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.
