PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT

FETESTEXCEPT(3P)          POSIX Programmer's Manual         FETESTEXCEPT(3P)

PROLOG         top

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

NAME         top

       fetestexcept — test floating-point exception flags

SYNOPSIS         top

       #include <fenv.h>
       int fetestexcept(int excepts);

DESCRIPTION         top

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

RETURN VALUE         top

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

ERRORS         top

       No errors are defined.
       The following sections are informative.

EXAMPLES         top

       The following example calls function f() if an invalid exception is
       set, and then function g() if an overflow exception is set:
           #include <fenv.h>
           /* ... */
           {
               #pragma STDC FENV_ACCESS ON
               int set_excepts;
               feclearexcept(FE_INVALID | FE_OVERFLOW);
               // maybe raise exceptions
               set_excepts = fetestexcept(FE_INVALID | FE_OVERFLOW);
               if (set_excepts & FE_INVALID) f();
               if (set_excepts & FE_OVERFLOW) g();
               /* ... */
           }

APPLICATION USAGE         top

       None.

RATIONALE         top

       None.

FUTURE DIRECTIONS         top

       None.

SEE ALSO         top

       feclearexcept(3p), fegetexceptflag(3p), feraiseexcept(3p)
       The Base Definitions volume of POSIX.1‐2008, fenv.h(0p)

COPYRIGHT         top

       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information
       Technology -- Portable Operating System Interface (POSIX), The Open
       Group Base Specifications Issue 7, Copyright (C) 2013 by the
       Institute of Electrical and Electronics Engineers, Inc and The Open
       Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1
       applied.) In the event of any discrepancy between this version and
       the original IEEE and The Open Group Standard, the original IEEE and
       The Open Group Standard is the referee document. The original
       Standard can be obtained online at http://www.unix.org/online.html .
       Any typographical or formatting errors that appear in this page are
       most likely to have been introduced during the conversion of the
       source files to man page format. To report such errors, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group                 2013                    FETESTEXCEPT(3P)

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