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FETESTEXCEPT 3M "Jul 12, 2006" "SunOS 5.11" "Mathematical Library Functions"
NAME
fetestexcept - 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 argument 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 currently 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 ALSO
feclearexcept(3M), fegetexceptflag(3M), fenv.h(3HEAD), attributes(5), standards(5)