mirror of https://github.com/mkerrisk/man-pages
92 lines
2.4 KiB
Groff
92 lines
2.4 KiB
Groff
.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
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.\"
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.\" %%%LICENSE_START(VERBATIM)
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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.\" manual page may be incorrect or out-of-date.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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.\" %%%LICENSE_END
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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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.\" 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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.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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.PP
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.BI "double infnan(int " error );
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.fi
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.PP
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Link with \fI\-lm\fP.
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.SH DESCRIPTION
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The
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.BR infnan ()
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function returns a suitable value for infinity and
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"not-a-number" (NaN) results.
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The value of
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.I error
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can be
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.B ERANGE
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to represent infinity or anything else to represent NaN.
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.I errno
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is also set.
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.SH RETURN VALUE
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If
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.I error
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is
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.B ERANGE
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(Infinity),
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.B HUGE_VAL
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is returned.
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.PP
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If
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.I error
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is
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.RB \- ERANGE
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(\-Infinity),
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.RB \- HUGE_VAL
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is returned.
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.PP
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If
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.I error
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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
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.I error
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is "not-a-number" (NaN).
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.TP
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.B ERANGE
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The value of
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.I error
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is positive infinity or negative infinity.
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.SH CONFORMING TO
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4.3BSD.
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.SH NOTES
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This obsolete function was provided in
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libc4 and libc5, but is not available in glibc2.
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