centos man page for fetestexcept

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 correspond-
       ing 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 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 IEEE Std 1003.1-2001, <fenv.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
       Electrical and Electronics Engineers, Inc and The Open Group. 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.opengroup.org/unix/online.html .

IEEE
/The Open Group						       2003							  FETESTEXCEPT(3P)