floatingpoint(3bsd)

Synopsis

   /usr/ucb/cc [flag . . . ] file . . .
   

   #include <sys/ieeefp.h>
   #include <fp.h>

Description

IEEE rounding modes:

fp_direction_type

The type of the IEEE rounding direction mode. Note: the order of enumeration varies according to hardware.

fp_direction

The IEEE rounding direction mode currently in force. This is a global variable that is intended to reflect the hardware state, so it should only be written indirectly through a function that also sets the hardware state.

fp_precision_type

The type of the IEEE rounding precision mode, which only applies on systems that support extended precision.

fp_precision

The IEEE rounding precision mode currently in force. This is a global variable that is intended to reflect the hardware state on systems with extended precision, so it should only be written indirectly.

SIGFPE handling:

sigfpe_code_type

The type of a SIGFPE code.

sigfpe_handler_type

The type of a user-definable SIGFPE exception handler called to handle a particular SIGFPE code.

SIGFPE_DEFAULT

A macro indicating the default SIGFPE exception handling, namely to perform the exception handling specified by calls to ieee_handler(3bsd), if any, and otherwise to dump core using abort(3C).

SIGFPE_IGNORE

A macro indicating an alternate SIGFPE exception handling, namely to ignore and continue execution.

SIGFPE_ABORT

A macro indicating an alternate SIGFPE exception handling, namely to abort with a core dump.

IEEE exception handling:

N_IEEE_EXCEPTION

The number of distinct IEEE floating-point exceptions.

fp_exception_type

The type of the N_IEEE_EXCEPTION exceptions. Each exception is given a bit number.

fp_exception_field_type

The type intended to hold at least N_IEEE_EXCEPTION bits corresponding to the IEEE exceptions numbered by fp_exception_type. Thus fp_inexact corresponds to the least significant bit and fp_invalid to the fifth least significant bit. Note: some operations may set more than one exception.

fp_accrued_exceptions

The IEEE exceptions between the time this global variable was last cleared, and the last time a function was called to update the variable by obtaining the hardware state.

ieee_handlers

An array of user-specifiable signal handlers for use by the standard SIGFPE handler for IEEE arithmetic-related SIGFPE codes. Since IEEE trapping modes correspond to hardware modes, elements of this array should only be modified with a function like ieee_handler(3bsd) that performs the appropriate hardware mode update. If no sigfpe_handler has been declared for a particular IEEE-related SIGFPE code, then the related ieee_handlers will be invoked.

IEEE formats and classification:

single;extended

Definitions of IEEE formats.

fp_class_type

An enumeration of the various classes of IEEE values and symbols.

IEEE base conversion:

DECIMAL_STRING_LENGTH

The length of a decimal_string.

decimal_string

The digit buffer in a decimal_record.

decimal_record

The canonical form for representing an unpacked decimal floating-point number.

decimal_form

The type used to specify fixed or floating binary to decimal conversion.

decimal_mode

A struct that contains specifications for conversion between binary and decimal.

decimal_string_form

An enumeration of possible valid character strings representing floating-point numbers, infinities, or NaNs.

Files

/usr/include/sys/ieeefp.h

/usr/include/fp.h

/usr/ucblib/libucb.a

References