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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "LROUND" 3P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" lround 
+.SH PROLOG
+This manual page is part of the POSIX Programmer's Manual.
+The Linux implementation of this interface may differ (consult
+the corresponding Linux manual page for details of Linux behavior),
+or the interface may not be implemented on Linux.
+.SH NAME
+lround, lroundf, lroundl \- round to nearest integer value
+.SH SYNOPSIS
+.LP
+\fB#include <math.h>
+.br
+.sp
+long lround(double\fP \fIx\fP\fB);
+.br
+long lroundf(float\fP \fIx\fP\fB);
+.br
+long lroundl(long double\fP \fIx\fP\fB);
+.br
+\fP
+.SH DESCRIPTION
+.LP
+These functions shall round their argument to the nearest integer
+value, rounding halfway cases away from zero, regardless of
+the current rounding direction.
+.LP
+An application wishing to check for error situations should set \fIerrno\fP
+to zero and call
+\fIfeclearexcept\fP(FE_ALL_EXCEPT) before calling these functions.
+On return, if \fIerrno\fP is non-zero or
+\fIfetestexcept\fP(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW)
+is non-zero, an error has occurred.
+.SH RETURN VALUE
+.LP
+Upon successful completion, these functions shall return the rounded
+integer value.
+.LP
+If
+\fIx\fP is NaN, a domain error shall occur and an unspecified value
+is returned.
+.LP
+If \fIx\fP is +Inf, a domain error shall occur and an unspecified
+value is returned.
+.LP
+If \fIx\fP is -Inf, a domain error shall occur and an unspecified
+value is returned.
+.LP
+If the correct value is positive and too large to represent as a \fBlong\fP,
+a domain error shall occur and an unspecified
+value is returned.
+.LP
+If the correct value is negative and too large to represent as a \fBlong\fP,
+a domain error shall occur and an unspecified
+value is returned. 
+.SH ERRORS
+.LP
+These functions shall fail if:
+.TP 7
+Domain\ Error
+The \fIx\fP argument is NaN or \(+-Inf, or the correct value is not
+representable as an integer. 
+.LP
+If the integer expression (math_errhandling & MATH_ERRNO) is non-zero,
+then \fIerrno\fP shall be set to [EDOM]. If the
+integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero,
+then the invalid floating-point exception shall be raised.
+.sp
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+On error, the expressions (math_errhandling & MATH_ERRNO) and (math_errhandling
+& MATH_ERREXCEPT) are independent of
+each other, but at least one of them must be non-zero.
+.SH RATIONALE
+.LP
+These functions differ from the \fIlrint\fP() functions in the default
+rounding
+direction, with the \fIlround\fP() functions rounding halfway cases
+away from zero and needing not to raise the inexact
+floating-point exception for non-integer arguments that round to within
+the range of the return type.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIfeclearexcept\fP(), \fIfetestexcept\fP(), \fIllround\fP(), the
+Base Definitions volume of IEEE\ Std\ 1003.1-2001, Section 4.18, Treatment
+of Error Conditions for Mathematical Functions, \fI<math.h>\fP
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group. In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .