.\" 386BSD man pages
.\" Modified 1993-07-24 by Rik Faith (faith@cs.unc.edu)
.\" Modified 2002-08-10 by Walter Harms (walter.harms@informatik.uni-oldenburg.de)
-.TH COPYSIGN 3 2012-03-25 "GNU" "Linux Programmer's Manual"
+.TH COPYSIGN 3 2013-10-14 "GNU" "Linux Programmer's Manual"
.SH NAME
copysign, copysignf, copysignl \- copy sign of a number
.SH SYNOPSIS
.ad b
.SH DESCRIPTION
The
-.BR copysign ()
+.BR copysign (),
+.BR copysignf (),
+and
+.BR copysignl ()
functions return a value whose absolute value matches
that of
.IR x ,
is returned.
.SH ERRORS
No errors occur.
+.SH ATTRIBUTES
+.SS Multithreading (see pthreads(7))
+The
+.BR copysign (),
+.BR copysignf (),
+and
+.BR copysignl ()
+functions are thread-safe.
.SH CONFORMING TO
C99, POSIX.1-2001.
.\" 4.3BSD.
recommended functions in IEEE 754/IEEE 854).
.SH NOTES
On architectures where the floating-point formats are not IEEE 754 compliant,
-the
-.BR copysign ()
+these
functions may treat a negative zero as positive.
.SH SEE ALSO
.BR signbit (3)
+.SH COLOPHON
+This page is part of release 3.79 of the Linux
+.I man-pages
+project.
+A description of the project,
+information about reporting bugs,
+and the latest version of this page,
+can be found at
+\%http://www.kernel.org/doc/man\-pages/.