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fesettrapenable.3m (2010 09)

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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 bit-
wise 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 HP 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
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.
SEE ALSO
feclearexcept(3M), fegetexceptflag(3M), fegettrapenable(3M), feraiseexcept(3M), fesetexceptflag(3M),
fetestexcept(3M), fenv(5).
HP-UX 11i Version 3: September 2010 − 1 − Hewlett-Packard Company 1

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