fetestexcept man page on FreeBSD

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FECLEAREXCEPT(3)	 BSD Library Functions Manual	      FECLEAREXCEPT(3)

     feclearexcept, fegetexceptflag, feraiseexcept, fesetexceptflag,
     fetestexcept — floating-point exception flag manipulation

     Math Library (libm, -lm)

     #include <fenv.h>
     #pragma STDC FENV_ACCESS ON

     feclearexcept(int excepts);

     fegetexceptflag(fexcept_t *flagp, int excepts);

     feraiseexcept(int excepts);

     fesetexceptflag(const fexcept_t *flagp, int excepts);

     fetestexcept(int excepts);

     The feclearexcept() routine clears the floating-point exception flags
     specified by excepts, whereas feraiseexcept() raises the specified excep‐
     tions.  Raising an exception causes the corresponding flag to be set, and
     a SIGFPE is delivered to the process if the exception is unmasked.

     The fetestexcept() function determines which flags are currently set, of
     those specified by excepts.

     The fegetexceptflag() function stores the state of the exception flags
     specified in excepts in the opaque object pointed to by flagp.  Simi‐
     larly, fesetexceptflag() changes the specified exception flags to reflect
     the state stored in the object pointed to by flagp.  Note that the flags
     restored with fesetexceptflag() must be a (not necessarily proper) subset
     of the flags recorded by a prior call to fegetexceptflag().

     For all of these functions, the possible types of exceptions include
     those described in fenv(3).  Some architectures may define other types of
     floating-point exceptions.

     On some architectures, raising an overflow or underflow exception also
     causes an inexact exception to be raised.	In these cases, the overflow
     or underflow will be raised first.

     The fegetexceptflag() and fesetexceptflag() routines are preferred to
     fetestexcept() and feraiseexcept(), respectively, for saving and restor‐
     ing exception flags.  The latter do not re-raise exceptions and may pre‐
     serve architecture-specific information such as addresses where excep‐
     tions occurred.

     The feclearexcept(), fegetexceptflag(), feraiseexcept(), and
     fesetexceptflag() functions return 0 upon success, and non-zero other‐
     wise.  The fetestexcept() function returns the bitwise OR of the values
     of the current exception flags that were requested.

     sigaction(2), feholdexcept(3), fenv(3), feupdateenv(3), fpgetsticky(3),

     The feclearexcept(), fegetexceptflag(), feraiseexcept(),
     fesetexceptflag(), and fetestexcept() routines conform to ISO/IEC
     9899:1999 (“ISO C99”).

     These functions first appeared in FreeBSD 5.3.

BSD				  May 8, 2004				   BSD

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