NAME
feraiseexcept —
raise floating-point exception
SYNOPSIS
#include
<fenv.h>
int feraiseexcept(int excepts);
DESCRIPTION
[CX] 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 IEEE Std 1003.1-2001 (“POSIX.1”) defers to the ISO C standard.
The feraiseexcept () function
shall attempt to raise the supported floating-point exceptions represented
by the argument
excepts. The
order in which these floating-point exceptions are raised is unspecified.
Whether the feraiseexcept () function additionally
raises the inexact floating-point exception whenever it raises the overflow
or underflow floating-point exception is implementation-defined.
RETURN VALUE
If the argument is zero or if all the specified exceptions were
successfully raised, feraiseexcept () shall return
zero. Otherwise, it shall return a non-zero value.
ERRORS
No errors are defined.
EXAMPLES
None.
APPLICATION USAGE
The effect is intended to be similar to that of floating-point exceptions raised by arithmetic operations. Hence, enabled traps for floating-point exceptions raised by this function are taken.
RATIONALE
Raising overflow or underflow is allowed to also raise inexact because on some architectures the only practical way to raise an exception is to execute an instruction that has the exception as a side effect. The function is not restricted to accept only valid coincident expressions for atomic operations, so the function can be used to raise exceptions accrued over several operations.
FUTURE DIRECTIONS
None.
SEE ALSO
feclearexcept(3) , fegetexceptflag(3) , fesetexceptflag(3) , fetestexcept(3) , the Base Definitions volume of IEEE Std 1003.1-2001 (“POSIX.1”), <fenv.h>
CHANGE HISTORY
First released in Issue 6. Derived from the ISO/IEC 9899:1999 (“ISO C99”) standard.
ISO/IEC 9899:1999 (“ISO C99”) standard, Technical Corrigendum No. 1 is incorporated.
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