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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "ISINF" 3P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" isinf 
+.SH PROLOG
+This manual page is part of the POSIX Programmer's Manual.
+The Linux implementation of this interface may differ (consult
+the corresponding Linux manual page for details of Linux behavior),
+or the interface may not be implemented on Linux.
+.SH NAME
+isinf \- test for infinity
+.SH SYNOPSIS
+.LP
+\fB#include <math.h>
+.br
+.sp
+int isinf(real-floating\fP \fIx\fP\fB);
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fIisinf\fP() macro shall determine whether its argument value
+is an infinity (positive or negative). First, an argument
+represented in a format wider than its semantic type is converted
+to its semantic type. Then determination is based on the type of
+the argument.
+.SH RETURN VALUE
+.LP
+The \fIisinf\fP() macro shall return a non-zero value if and only
+if its argument has an infinite value.
+.SH ERRORS
+.LP
+No errors are defined.
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+None.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIfpclassify\fP(), \fIisfinite\fP(), \fIisnan\fP(), \fIisnormal\fP(),
+\fIsignbit\fP(), the
+Base Definitions volume of IEEE\ Std\ 1003.1-2001 \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 .