'\" te .\" Copyright (c) 2001, the Institute of Electrical and Electronics Engineers, Inc. and The Open Group. All Rights Reserved. .\" Portions Copyright (c) 2006, Sun Microsystems, Inc. All Rights Reserved. .\" Sun Microsystems, Inc. gratefully acknowledges The Open Group for permission to reproduce portions of its copyrighted documentation. Original documentation from The Open Group can be obtained online at http://www.opengroup.org/bookstore/. .\" The Institute of Electrical and Electronics Engineers and The Open Group, have given us permission to reprint portions of their documentation. In the following statement, the phrase "this text" refers to portions of the system documentation. Portions of this text are reprinted and reproduced in electronic form in the Sun OS Reference Manual, from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between these versions 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. This notice shall appear on any product containing this material. .TH isinf 3M "17 Nov 2008" "SunOS 5.11" "Mathematical Library Functions" .SH NAME isinf \- test for infinity .SH SYNOPSIS .LP .nf c99 [ \fIflag\fR... ] \fIfile\fR... \fB-lm\fR [ \fIlibrary\fR... ] #include \fBint\fR \fBisinf\fR(\fBreal-floating\fR \fIx\fR); .fi .SH DESCRIPTION .sp .LP The \fBisinf()\fR macro determines 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 VALUES .sp .LP The \fBisinf()\fR macro returns a non-zero value if and only if its argument has an infinite value. .SH ERRORS .sp .LP No errors are defined. .SH ATTRIBUTES .sp .LP See \fBattributes\fR(5) for descriptions of the following attributes: .sp .sp .TS tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) . ATTRIBUTE TYPEATTRIBUTE VALUE _ Interface StabilityCommitted _ MT-LevelMT-Safe _ StandardSee \fBstandards\fR(5). .TE .SH SEE ALSO .sp .LP \fBfpclassify\fR(3M), \fBisfinite\fR(3M), \fBisnan\fR(3M), \fBisnormal\fR(3M), \fBmath.h\fR(3HEAD), \fBsignbit\fR(3M), \fBattributes\fR(5), \fBstandards\fR(5)