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NetBSD 6.1.5 - man page for feenableexcept (netbsd section 3)

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) excep-
     tions 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.

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


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