Document lgamma_r, lgammaf_r, and lgammal_r.

Prodded by espie@, OK martynas@

1 files changed, 35 insertions, 2 deletions

diff --git a/lib/libm/man/lgamma.3 b/lib/libm/man/lgamma.3
index 0e4bf818aea..914a8df95a4 100644
--- a/lib/libm/man/lgamma.3
+++ b/lib/libm/man/lgamma.3
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: lgamma.3,v 1.20 2013/07/17 05:42:11 schwarze Exp $
+.\"	$OpenBSD: lgamma.3,v 1.21 2013/08/07 22:20:25 millert Exp $
 .\" Copyright (c) 1985, 1991 Regents of the University of California.
 .\" All rights reserved.
 .\"
@@ -28,13 +28,16 @@
 .\"
 .\"     from: @(#)lgamma.3	6.6 (Berkeley) 12/3/92
 .\"
-.Dd $Mdocdate: July 17 2013 $
+.Dd $Mdocdate: August 7 2013 $
 .Dt LGAMMA 3
 .Os
 .Sh NAME
 .Nm lgamma ,
 .Nm lgammaf ,
 .Nm lgammal ,
+.Nm lgamma_r ,
+.Nm lgammaf_r ,
+.Nm lgammal_r ,
 .Nm tgamma ,
 .Nm tgammaf ,
 .Nm tgammal
@@ -51,6 +54,12 @@
 .Ft long double
 .Fn lgammal "long double x"
 .Ft double
+.Fn lgamma_r "double x" "int *signgamp"
+.Ft float
+.Fn lgammaf_r "float x" "int *signgamp"
+.Ft long double
+.Fn lgammal_r "long double x" "int *signgamp"
+.Ft double
 .Fn tgamma "double x"
 .Ft float
 .Fn tgammaf "float x"
@@ -82,6 +91,21 @@ function is an extended precision version of
 .Fn lgamma .
 .Pp
 The
+.Fn lgamma_r ,
+.Fn lgammaf_r ,
+and
+.Fn lgammal_r
+functions are thread-safe versions of
+.Fn lgamma ,
+.Fn lgammaf ,
+and
+.Fn lgammal
+that return the sign via the
+.Fa signgamp
+pointer instead of modifying
+.Fa signgam .
+.Pp
+The
 .Fn tgamma x ,
 .Fn tgammaf x
 and
@@ -134,6 +158,15 @@ and
 functions are expected to conform to
 .St -isoC-99 .
 .Pp
+The
+.Fn lgamma_r ,
+.Fn lgammaf_r ,
+and
+.Fn lgammal_r
+functions are
+.Bx
+extensions.
+.Pp
 .Fn gamma
 and
 .Fn gammaf