NAME
fegetenv() — get floating-point environment
SYNOPSIS
#include <fenv.h>
HP Integrity Server Only
int fegetenv(fenv_t *envp);
PA-RISC Only
void fegetenv(fenv_t *envp);
DESCRIPTION
The
fegetenv()
function stores the current floating-point environment in the object
pointed to by the argument
envp.
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 a representation
of the current environment was successfully stored.
ERRORS
No errors are defined.
EXAMPLES
Store the current floating-point environment:
#include <fenv.h>
/*...*/
fenv_t env;
/*...*/
fegetenv(&env);
STANDARDS CONFORMANCE
fegetenv()
: ISO/IEC C99 (including Annex F, "IEC 60559 floating-point arithmetic")
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