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FETESTEXCEPT(3P)           POSIX Programmer's Manual          FETESTEXCEPT(3P)
PROLOG
       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
       fetestexcept -- test floating-point exception flags
SYNOPSIS
       #include <fenv.h>
       int fetestexcept(int excepts);
DESCRIPTION
       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
       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
       No errors are defined.
       The following sections are informative.
EXAMPLES
       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
       None.
RATIONALE
       None.
FUTURE DIRECTIONS
       None.
SEE ALSO
       feclearexcept(), fegetexceptflag(), feraiseexcept()
       The Base Definitions volume of POSIX.1-2008, <fenv.h>
COPYRIGHT
       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 Electri-
       cal 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.ker-
       nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group                  2013                     FETESTEXCEPT(3P)