fetestexcept(3p) [suse man page]

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)

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

       fegetexceptflag, fesetexceptflag - get and set floating-point status flags

SYNOPSIS

       #include <fenv.h>

       int fegetexceptflag(fexcept_t *flagp, int excepts);
       int fesetexceptflag(const fexcept_t *flagp, int excepts);

DESCRIPTION

       The fegetexceptflag() function shall attempt to store an implementation-defined representation of the states of the  floating-point  status
       flags indicated by the argument excepts in the object pointed to by the argument flagp.

       The  fesetexceptflag() function shall attempt to set the floating-point status flags indicated by the argument excepts to the states stored
       in the object pointed to by flagp.  The value pointed to by flagp shall have been set by a previous call to fegetexceptflag() whose  second
       argument  represented  at least those floating-point exceptions represented by the argument excepts. This function does not raise floating-
       point exceptions, but only sets the state of the flags.

RETURN VALUE

       If the representation was successfully stored, fegetexceptflag() shall return zero. Otherwise, it shall return a  non-zero  value.  If  the
       excepts argument is zero or if all the specified exceptions were successfully set, fesetexceptflag() shall return zero. Otherwise, it shall
       return a non-zero value.

ERRORS

       No errors are defined.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       feclearexcept(), feraiseexcept(), fetestexcept(), 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						       FEGETEXCEPTFLAG(3P)