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FPGETMASK(3)			   BSD Library Functions Manual 		     FPGETMASK(3)

     fpgetmask, fpgetprec, fpgetround, fpgetsticky, fpsetmask, fpsetprec, fpsetround, fpsetsticky
     -- IEEE FP mode control

     Standard C Library (libc, -lc)

     #include <ieeefp.h>





     fpsetmask(fp_except_t mask);

     fpsetprec(fp_prec_t prec);

     fpsetround(fp_rnd_t rnd_dir);

     fpsetsticky(fp_except_t sticky);

     A rounding mode fp_rnd_t is one of:

	   FP_RZ    rounding towards zero
	   FP_RM    rounding down to (Minus infinity)
	   FP_RN    rounding to nearest
	   FP_RP    rounding down to (Plus infinity)
     The default mode is FP_RN.

     An fp_except_t value is a bitmask specifying an exception type and containing any of the
     values listed below.

	   FP_X_INV	 Invalid Operation
	   FP_X_DZ	 Division by zero
	   FP_X_OFL	 Overflow
	   FP_X_UFL	 Underflow
	   FP_X_IMP	 Imprecision (inexact)
	   FP_X_IOV	 Integer Overflow

     An fp_prec_t specifies the precision of the floating point operations listed below.

	   FP_PS     24 bit (single-precision)
	   FP_PRS    reserved
	   FP_PD     53 bit (double-precision)
	   FP_PE     64 bit (extended-precision)

     The fpsetmask() function will set the current exception mask, i.e., it will cause future
     operations with the specified result status to raise the SIGFPE exception.  The fpgetmask()
     function will return the current exception mask.

     The fpgetprec() function will return the current floating point precision.  The fpsetprec()
     function will set the floating point precision and will return the previous precision.

     The fpsetround() function will cause future operations to use the specified dynamic rounding
     mode.  The fpgetround() function will return the current rounding mode.

     Note:   On some architectures, instructions can optionally specify static rounding modes and
	     exception enables that will supersede the specified dynamic mode.	On other archi-
	     tectures, these features may not be fully supported.

     A ``sticky'' status word may be maintained in which a bit is set every time an exceptional
     floating point condition is encountered, whether or not a SIGFPE is generated.  The
     fpsetsticky() function will set or clear the specified exception history bits.  The
     fpgetsticky() function will return the exception history bits.

     The fpgetround() and fpsetround() functions return the (previous) rounding mode.  The
     fpgetmask(), fpsetmask(), fpgetsticky(), and fpsetsticky() functions return the (previous)
     exception mask and exception history bits.

     sigaction(2), fenv(3)

     There is no way to return an unsupported value.  Not all processors support all the modes.
     These interfaces are deprecated and the ones in fenv(3) should be used, although the inter-
     faces in fenv(3) don't support getting or setting the precision.

BSD					  March 26, 2011				      BSD
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