.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
.\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk
.\" <mtk.manpages@gmail.com>
+.\"
+.\" %%%LICENSE_START(GPL_NOVERSION_ONELINE)
.\" Distributed under GPL
+.\" %%%LICENSE_END
+.\"
.\" Based on glibc infopages, copyright Free Software Foundation
-.TH SIGNBIT 3 2010-09-20 "GNU" "Linux Programmer's Manual"
+.\"
+.TH SIGNBIT 3 2013-07-04 "GNU" "Linux Programmer's Manual"
.SH NAME
signbit \- test sign of a real floating-point number
.SH SYNOPSIS
is negative; otherwise it returns zero.
.SH ERRORS
No errors occur.
-.SH "CONFORMING TO"
+.SH ATTRIBUTES
+.SS Multithreading (see pthreads(7))
+The
+.BR signbit ()
+macro is thread-safe.
+.SH CONFORMING TO
C99, POSIX.1-2001.
This function is defined in IEC 559 (and the appendix with
recommended functions in IEEE 754/IEEE 854).
-.SH "SEE ALSO"
+.SH SEE ALSO
.BR copysign (3)
+.SH COLOPHON
+This page is part of release 3.65 of the Linux
+.I man-pages
+project.
+A description of the project,
+and information about reporting bugs,
+can be found at
+\%http://www.kernel.org/doc/man\-pages/.