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 FLOATINGPOINT.H 3HEAD "Mar 5, 1993"
 NAME
floatingpoint.h, floatingpoint - IEEE floating point definitions

 SYNOPSIS


#include <floatingpoint.h>




 DESCRIPTION

This file defines constants, types, and functions used to implement standard
floating point according to ANSI/IEEE Std 754-1985. The functions are
implemented in libc. The included header file <sys/ieeefp.h>
defines certain types of interest to the kernel.

 "IEEE Rounding Modes"
fp_direction_type


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



fp_precision_type


The type of the IEEE rounding precision mode, which only applies on systems
that support extended precision such as machines based on the Intel 80387 FPU
or the 80486. 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 the user, 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.




 "IEEE Formats and Classification"
single;\|extended;\|quadruple


Definitions of IEEE formats.



fp_class_type


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




 "IEEE Base Conversion"

The functions described under floating_to_decimal(3C) and
decimal_to_floating(3C) satisfy not only the IEEE Standard, but
also the stricter requirements of correct rounding for all arguments.
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

 SEE ALSO

 abort (3C),  decimal_to_floating (3C),  econvert (3C),  floating_to_decimal (3C),  sigfpe (3C),  string_to_decimal (3C),  strtod (3C)