71 lines
2.4 KiB
C
71 lines
2.4 KiB
C
|
/*
|
||
|
|
(c) Copyright 2019 Joel Sherrill <joel@rtems.org
|
||
|
|
All rights reserved.
|
||
|
|
|
||
|
|
Redistribution and use in source and binary forms, with or without
|
||
|
|
modification, are permitted provided that the following conditions
|
||
|
|
are met:
|
||
|
|
|
||
|
|
1. Redistributions of source code must retain the above copyright
|
||
|
|
notice, this list of conditions and the following disclaimer.
|
||
|
|
|
||
|
|
2. Redistributions in binary form must reproduce the above copyright
|
||
|
|
notice, this list of conditions and the following disclaimer in the
|
||
|
|
documentation and/or other materials provided with the distribution.
|
||
|
|
|
||
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||
|
|
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||
|
|
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
||
|
|
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
||
|
|
HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
||
|
|
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
||
|
|
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
||
|
|
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
||
|
|
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
||
|
|
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
||
|
|
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <fenv.h>
|
||
|
|
#include <errno.h>
|
||
|
|
|
||
|
|
/*
|
||
|
|
FUNCTION
|
||
|
|
<<feholdexcept>>---save current floating-point environment
|
||
|
|
|
||
|
|
INDEX
|
||
|
|
feholdexcept
|
||
|
|
|
||
|
|
SYNOPSIS
|
||
|
|
#include <fenv.h>
|
||
|
|
int feholdexcept(fenv_t *<[envp]>);
|
||
|
|
|
||
|
|
Link with -lm.
|
||
|
|
|
||
|
|
DESCRIPTION
|
||
|
|
This method attempts to save the current floating-point environment
|
||
|
|
in the fenv_t instance pointed to by <[envp]>, clear the floating
|
||
|
|
point status flags, and then, if supported by the target architecture,
|
||
|
|
install a "non-stop" (e.g. continue on floating point exceptions) mode
|
||
|
|
for all floating-point exceptions.
|
||
|
|
|
||
|
|
RETURNS
|
||
|
|
This method will return zero if the non-stop floating-point exception
|
||
|
|
handler was installed. Otherwise, a non-zero value is returned.
|
||
|
|
|
||
|
|
PORTABILITY
|
||
|
|
ANSI C requires <<feholdexcept>>.
|
||
|
|
|
||
|
|
Not all Newlib targets have a working implementation. Refer to
|
||
|
|
the file <<sys/fenv.h>> to see the status for your target.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*
|
||
|
|
* This is a non-functional implementation that should be overridden
|
||
|
|
* by an architecture specific implementation in newlib/libm/machine/ARCH.
|
||
|
|
*/
|
||
|
|
int feholdexcept(fenv_t *envp)
|
||
|
|
{
|
||
|
|
return -ENOTSUP;
|
||
|
|
}
|