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fegetenv.3m (2010 09)

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fegetenv(3M) fegetenv(3M)
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 success-
fully stored.
PA-RISC Only
None.
ERRORS
No errors are defined.
EXAMPLES
Store the current floating-point environment:
#include <fenv.h>
/*...*/
fenv_t env;
/*...*/
fegetenv(&env);
SEE ALSO
feholdexcept(3M), fesetenv(3M), feupdateenv(3M), fenv(5).
STANDARDS CONFORMANCE
fegetenv() : ISO/IEC C99 (including Annex F, "IEC 60559 floating-point arithmetic")
HP-UX 11i Version 3: September 2010 − 1 − Hewlett-Packard Company 1

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