netbsd man page for fegetexcept

FEENABLEEXCEPT(3)					   BSD Library Functions Manual 					 FEENABLEEXCEPT(3)

NAME
     feenableexcept, fedisableexcept, fegetexcept -- floating-point exception masking

LIBRARY
     Math Library (libm, -lm)

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

     int
     feenableexcept(int excepts);

     int
     fedisableexcept(int excepts);

     int
     fegetexcept(void);

DESCRIPTION
     The feenableexcept() and fedisableexcept() functions unmask and mask (respectively) exceptions specified in excepts.  The fegetexcept() func-
     tion 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.

RETURN VALUES
     The feenableexcept(), fedisableexcept(), and fegetexcept() functions return a bitmap of the exceptions that were unmasked prior to the call.

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

BUGS
     Functions in the standard library may trigger exceptions multiple times as a result of intermediate computations; however, they generally do
     not trigger spurious exceptions.

     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.

BSD
								  March 16, 2005							       BSD