fetestexcept(3M) Mathematical Library Functions fetestexcept(3M)NAMEfetestexcept - test floating-point exception flags
SYNOPSIS
c99 [ flag... ] file... -lm [ library... ]
#include <fenv.h>
int fetestexcept(int excepts);
DESCRIPTION
The fetestexcept() function determines which of a specified subset of
the floating-point exception flags are currently set. The excepts argu‐
ment specifies the floating-point status flags to be queried.
RETURN VALUES
The fetestexcept() function returns the value of the bitwise-inclusive
OR of the floating-point exception macros corresponding to the cur‐
rently set floating-point exceptions included in excepts.
ERRORS
No errors are defined.
EXAMPLES
Example 1: Example using fetestexcept()
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();
/* ... */
}
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Interface Stability │Standard │
├─────────────────────────────┼─────────────────────────────┤
│MT-Level │MT-Safe │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOfeclearexcept(3M), fegetexceptflag(3M), fenv.h(3HEAD), attributes(5),
standards(5)SunOS 5.10 12 Jul 2006 fetestexcept(3M)
