1FETESTEXCEPT(3P)           POSIX Programmer's Manual          FETESTEXCEPT(3P)
2
3
4

PROLOG

6       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
7       implementation of this interface may differ (consult the  corresponding
8       Linux  manual page for details of Linux behavior), or the interface may
9       not be implemented on Linux.
10
11

NAME

13       fetestexcept — test floating-point exception flags
14

SYNOPSIS

16       #include <fenv.h>
17
18       int fetestexcept(int excepts);
19

DESCRIPTION

21       The functionality described on this reference page is aligned with  the
22       ISO C  standard.  Any  conflict between the requirements described here
23       and the ISO C standard is unintentional. This  volume  of  POSIX.1‐2008
24       defers to the ISO C standard.
25
26       The fetestexcept() function shall determine which of a specified subset
27       of the floating-point exception flags are currently  set.  The  excepts
28       argument specifies the floating-point status flags to be queried.
29

RETURN VALUE

31       The  fetestexcept()  function  shall  return  the value of the bitwise-
32       inclusive OR of the floating-point exception  macros  corresponding  to
33       the currently set floating-point exceptions included in excepts.
34

ERRORS

36       No errors are defined.
37
38       The following sections are informative.
39

EXAMPLES

41       The  following  example  calls  function f() if an invalid exception is
42       set, and then function g() if an overflow exception is set:
43
44           #include <fenv.h>
45           /* ... */
46           {
47               #pragma STDC FENV_ACCESS ON
48               int set_excepts;
49               feclearexcept(FE_INVALID | FE_OVERFLOW);
50               // maybe raise exceptions
51               set_excepts = fetestexcept(FE_INVALID | FE_OVERFLOW);
52               if (set_excepts & FE_INVALID) f();
53               if (set_excepts & FE_OVERFLOW) g();
54               /* ... */
55           }
56

APPLICATION USAGE

58       None.
59

RATIONALE

61       None.
62

FUTURE DIRECTIONS

64       None.
65

SEE ALSO

67       feclearexcept(), fegetexceptflag(), feraiseexcept()
68
69       The Base Definitions volume of POSIX.1‐2008, <fenv.h>
70

72       Portions of this text are reprinted and reproduced in  electronic  form
73       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
74       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
75       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
76       cal and Electronics Engineers,  Inc  and  The  Open  Group.   (This  is
77       POSIX.1-2008  with  the  2013  Technical Corrigendum 1 applied.) In the
78       event of any discrepancy between this version and the original IEEE and
79       The  Open Group Standard, the original IEEE and The Open Group Standard
80       is the referee document. The original Standard can be  obtained  online
81       at http://www.unix.org/online.html .
82
83       Any  typographical  or  formatting  errors that appear in this page are
84       most likely to have been introduced during the conversion of the source
85       files  to  man page format. To report such errors, see https://www.ker‐
86       nel.org/doc/man-pages/reporting_bugs.html .
87
88
89
90IEEE/The Open Group                  2013                     FETESTEXCEPT(3P)
Impressum