2004-11-03 13:51:07 +00:00
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.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
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.\"
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\"
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.\" References consulted:
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.\" Linux libc source code
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.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
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.\" 386BSD man pages
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.\" Modified Sat Jul 24 19:11:11 1993 by Rik Faith (faith@cs.unc.edu)
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2004-11-12 17:39:18 +00:00
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.\" Modified 2004-11-12 as per suggestion by Fabian Kreutz/AEB
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.\" to note that this function is not available in glibc2.
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.\"
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2004-11-03 13:51:07 +00:00
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.TH INFNAN 3 1993-06-02 "GNU" "Linux Programmer's Manual"
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.SH NAME
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infnan \- deal with infinite or not-a-number (NaN) result
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.SH SYNOPSIS
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.nf
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.B #include <math.h>
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.sp
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.BI "double infnan(int " error );
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.fi
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.sp
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Link with \-lm.
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.SH DESCRIPTION
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2005-10-19 07:07:02 +00:00
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The \fBinfnan\fP() function returns a suitable value for infinity and
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"not-a-number" (NaN) results. The value of \fIerror\fP can be ERANGE
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to represent infinity or anything else to represent NaN. \fIerrno\fP
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is also set.
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2004-11-12 17:39:18 +00:00
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.SH NOTES
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This obsolete function was provided in
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.I libc4
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and
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.IR libc5 ,
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but is not available in
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.IR glibc2 .
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.SH "RETURN VALUE"
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If \fIerror\fP is ERANGE (Infinity), HUGE_VAL is returned.
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.PP
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2005-07-06 08:00:30 +00:00
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If \fIerror\fP is \-ERANGE (\-Infinity), \-HUGE_VAL is returned.
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.PP
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If \fIerror\fP is anything else, NAN is returned.
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.SH ERRORS
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.TP
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.B EDOM
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The value of \fIerror\fP is "not-a-number" (NaN).
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.TP
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.B ERANGE
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The value of \fIerror\fP is positive or negative infinity.
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.SH "CONFORMING TO"
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2005-07-18 15:05:56 +00:00
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4.3BSD
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