| FEENABLEEXCEPT(3) | Library Functions Manual | FEENABLEEXCEPT(3) | 
feenableexcept, fedisableexcept,
  fegetexcept —
#include <fenv.h>
#pragma STDC FENV_ACCESS ON
int
  
  feenableexcept(int
    excepts);
int
  
  fedisableexcept(int
    excepts);
int
  
  fegetexcept(void);
feenableexcept() and
  fedisableexcept() functions unmask and mask
  (respectively) exceptions specified in excepts. The
  fegetexcept() function returns the current exception
  mask. All exceptions are masked by default.
Floating-point operations that produce unmasked exceptions will
    trap, and a SIGFPE will be delivered to the process.
    By installing a signal handler for SIGFPE,
    applications can take appropriate action immediately without testing the
    exception flags after every operation. Note that the trap may not be
    immediate, but it should occur before the next floating-point instruction is
    executed.
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.
feenableexcept(),
  fedisableexcept(), and
  fegetexcept() functions return a bitmap of the
  exceptions that were unmasked prior to the call.
No interface is provided to permit exceptions to be handled in nontrivial ways. There is no uniform way for an exception handler to access information about the exception-causing instruction, or to determine whether that instruction should be reexecuted after returning from the handler.
| March 16, 2005 | NetBSD 9.4 |