'\" te
.\" Copyright (c) 2001, the Institute of Electrical and Electronics Engineers, Inc. and The Open Group. All Rights Reserved.
.\" Portions Copyright (c) 2006, Sun Microsystems, Inc. All Rights Reserved.
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.TH fegetround 3M "12 Jul 2006" "SunOS 5.11" "Mathematical Library Functions"
.SH NAME
fegetround, fesetround \- get and set current rounding direction
.SH SYNOPSIS
.LP
.nf
c99 [ \fIflag\fR... ] \fIfile\fR... \fB-lm\fR [ \fIlibrary\fR... ]
#include <fenv.h>

\fBint\fR \fBfegetround\fR(\fBvoid\fR);
.fi

.LP
.nf
\fBint\fR \fBfesetround\fR(\fBint\fR \fIround\fR);
.fi

.SH DESCRIPTION
.sp
.LP
The fegetround function gets the current rounding direction.
.sp
.LP
The fesetround function establishes the rounding direction represented by its argument round. If the argument is not equal to the value of a rounding direction macro, the rounding direction is not changed.
.SH RETURN VALUES
.sp
.LP
The fegetround function returns the value of the rounding direction macro representing the current rounding direction, or a negative value if there is no such rounding direction macro or the current rounding direction is not determinable.
.sp
.LP
The fesetround function returns a 0 value if and only if the requested rounding direction was established.
.SH ERRORS
.sp
.LP
No errors are defined.
.SH EXAMPLES
.sp
.LP
The following example saves, sets, and restores the rounding direction, reporting an error and aborting if setting the rounding direction fails:
.LP
\fBExample 1 \fRSave, set, and restore the rounding direction.
.sp
.in +2
.nf
#include <fenv.h>
#include <assert.h>
void f(int round_dir)
{
      #pragma STDC FENV_ACCESS ON
      int save_round;
      int setround_ok;
      save_round = fegetround();
      setround_ok = fesetround(round_dir);
      assert(setround_ok == 0);
      /* ... */
      fesetround(save_round);
      /* ... */
}
.fi
.in -2

.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp

.sp
.TS
tab() box;
cw(2.75i) |cw(2.75i) 
lw(2.75i) |lw(2.75i) 
.
ATTRIBUTE TYPEATTRIBUTE VALUE
_
Interface StabilityCommitted
_
MT-LevelMT-Safe
_
StandardSee \fBstandards\fR(5).
.TE

.SH SEE ALSO
.sp
.LP
\fBfenv.h\fR(3HEAD), \fBattributes\fR(5), \fBstandards\fR(5)