1 /*
2 (c) Copyright 2019 Joel Sherrill <joel@rtems.org
3 All rights reserved.
4
5 Redistribution and use in source and binary forms, with or without
6 modification, are permitted provided that the following conditions
7 are met:
8
9 1. Redistributions of source code must retain the above copyright
10 notice, this list of conditions and the following disclaimer.
11
12 2. Redistributions in binary form must reproduce the above copyright
13 notice, this list of conditions and the following disclaimer in the
14 documentation and/or other materials provided with the distribution.
15
16 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include <fenv.h>
30 #include <errno.h>
31
32 /*
33 FUNCTION
34 <<feholdexcept>>---save current floating-point environment
35
36 INDEX
37 feholdexcept
38
39 SYNOPSIS
40 #include <fenv.h>
41 int feholdexcept(fenv_t *<[envp]>);
42
43 Link with -lm.
44
45 DESCRIPTION
46 This method attempts to save the current floating-point environment
47 in the fenv_t instance pointed to by <[envp]>, clear the floating
48 point status flags, and then, if supported by the target architecture,
49 install a "non-stop" (e.g. continue on floating point exceptions) mode
50 for all floating-point exceptions.
51
52 RETURNS
53 This method will return zero if the non-stop floating-point exception
54 handler was installed. Otherwise, a non-zero value is returned.
55
56 PORTABILITY
57 ANSI C requires <<feholdexcept>>.
58
59 Not all Newlib targets have a working implementation. Refer to
60 the file <<sys/fenv.h>> to see the status for your target.
61 */
62
63 /*
64 * This is a non-functional implementation that should be overridden
65 * by an architecture specific implementation in newlib/libm/machine/ARCH.
66 */
feholdexcept(fenv_t * envp)67 int feholdexcept(fenv_t *envp)
68 {
69 (void) envp;
70 return -ENOTSUP;
71 }
72
