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diff --git a/man3p/llround.3p b/man3p/llround.3p new file mode 100644 index 000000000..b65ed8506 --- /dev/null +++ b/man3p/llround.3p @@ -0,0 +1,100 @@ +.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved +.TH "LLROUND" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual" +.\" llround +.SH NAME +llround, llroundf, llroundl \- round to nearest integer value +.SH SYNOPSIS +.LP +\fB#include <math.h> +.br +.sp +long long llround(double\fP \fIx\fP\fB); +.br +long long llroundf(float\fP \fIx\fP\fB); +.br +long long llroundl(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 +long\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 +long\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 \fIllrint\fP() functions in that the +default rounding +direction for the \fIllround\fP() functions round halfway cases away +from zero and need not 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() , \fIlround\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 . |