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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "TGAMMA" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" tgamma 
+.SH NAME
+tgamma, tgammaf, tgammal \- compute gamma() function
+.SH SYNOPSIS
+.LP
+\fB#include <math.h>
+.br
+.sp
+double tgamma(double\fP \fIx\fP\fB);
+.br
+float tgammaf(float\fP \fIx\fP\fB);
+.br
+long double tgammal(long double\fP \fIx\fP\fB);
+.br
+\fP
+.SH DESCRIPTION
+.LP
+These functions shall compute the \fIgamma\fP() function of \fIx\fP.
+.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 \fIGamma\fP(
+\fIx\fP).
+.LP
+If \fIx\fP is a negative integer, a domain error shall occur, and
+either a NaN (if supported), or an implementation-defined
+value shall be returned.
+.LP
+If the correct value would cause overflow, a range error shall occur
+and \fItgamma\fP(), \fItgammaf\fP(), and \fItgammal\fP()
+shall return \(+-HUGE_VAL, \(+-HUGE_VALF, or \(+-HUGE_VALL, respectively,
+with the same sign as the correct value of
+the function.
+.LP
+If
+\fIx\fP is NaN, a NaN shall be returned.
+.LP
+If \fIx\fP is +Inf, \fIx\fP shall be returned.
+.LP
+If \fIx\fP is \(+-0, a pole error shall occur, and \fItgamma\fP(),
+\fItgammaf\fP(), and \fItgammal\fP() shall return
+\(+-HUGE_VAL, \(+-HUGE_VALF, and \(+-HUGE_VALL, respectively.
+.LP
+If \fIx\fP is -Inf, a domain error shall occur, and either a NaN (if
+supported), or an implementation-defined value shall be
+returned. 
+.SH ERRORS
+.LP
+These functions shall fail if:
+.TP 7
+Domain\ Error
+The value of \fIx\fP is a negative integer,   \ or \fIx\fP is -Inf.
+.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.
+.TP 7
+Pole\ Error
+The value of \fIx\fP is zero. 
+.LP
+If the integer expression (math_errhandling & MATH_ERRNO) is non-zero,
+then \fIerrno\fP shall be set to [ERANGE]. If the
+integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero,
+then the divide-by-zero floating-point exception shall be
+raised. 
+.br
+.TP 7
+Range\ Error
+The value overflows. 
+.LP
+If the integer expression (math_errhandling & MATH_ERRNO) is non-zero,
+then \fIerrno\fP shall be set to [ERANGE]. If the
+integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero,
+then the overflow floating-point exception shall be
+raised.
+.sp
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+For IEEE\ Std\ 754-1985 \fBdouble\fP, overflow happens when 0 < \fIx\fP
+< 1/DBL_MAX, and 171.7 <
+\fIx\fP.
+.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
+This function is named \fItgamma\fP() in order to avoid conflicts
+with the historical \fIgamma\fP() and \fIlgamma\fP() functions.
+.SH FUTURE DIRECTIONS
+.LP
+It is possible that the error response for a negative integer argument
+may be changed to a pole error and a return value of
+\(+-Inf.
+.SH SEE ALSO
+.LP
+\fIfeclearexcept\fP() , \fIfetestexcept\fP() , \fIlgamma\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 .