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NetBSD 6.1.5 - man page for feraiseexcept (netbsd section 3)

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

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

LIBRARY
     Math Library (libm, -lm)

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

     int
     feclearexcept(int excepts);

     int
     fegetexceptflag(fexcept_t *flagp, int excepts);

     int
     feraiseexcept(int excepts);

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

     int
     fetestexcept(int excepts);

DESCRIPTION
     The feclearexcept() routine clears the floating-point exception flags specified by excepts,
     whereas feraiseexcept() raises the specified exceptions.  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.	Similarly, fesetexceptflag() changes the speci-
     fied 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.

IMPLEMENTATION NOTES
     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 restoring exception flags.  The latter do not
     re-raise exceptions and may preserve architecture-specific information such as addresses
     where exceptions occurred.

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

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

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

HISTORY
     These functions first appeared in FreeBSD 5.3 and NetBSD 6.0.

BSD					   May 8, 2004					      BSD


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