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fegettrapenable.3m (2010 09)

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fegettrapenable(3M) fegettrapenable(3M)
NAME
fegettrapenable( ) - get floating-point exception trap enables
SYNOPSIS
#include <fenv.h>
int fegettrapenable(void);
DESCRIPTION
The fegettrapenable()
function determines which floating-point exception traps are currently
enabled.
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
The
fegettrapenable()
function returns the bitwise OR of the floating-point exception macros
corresponding to the currently enabled exception traps. The macros are
FE_INEXACT, FE_DIVBYZERO,
FE_UNDERFLOW, FE_OVERFLOW, and FE_INVALID. FE_ALL_EXCEPT
represents all the floating-
point exceptions.
ERRORS
No errors are defined.
EXAMPLES
Retrieve the current trap settings and determine whether a trap for the divide by zero exception is
enabled.
#include <fenv.h>
/*...*/
if (fegettrapenable() & FE_DIVBYZERO)
printf("divide by zero trap set\\n");
AUTHOR
fegettrapenable() was developed by HP and is not required by any current standard.
SEE ALSO
feclearexcept(3M), fegetexceptflag(3M), feraiseexcept(3M), fesetexceptflag(3M), fesettrapenable(3M),
fenv(5).
HP-UX 11i Version 3: September 2010 − 1 − Hewlett-Packard Company 1

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