string_copying.7: Document strndup(3)

[thirdparty/man-pages.git] / man3 / atanh.3

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-.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
-.\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk
-.\"     <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" References consulted:
-.\"     Linux libc source code
-.\"     Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
-.\"     386BSD man pages
-.\" Modified 1993-07-24 by Rik Faith (faith@cs.unc.edu)
-.\" Modified 2002-07-27 by Walter Harms
-.\"    (walter.harms@informatik.uni-oldenburg.de)
-.\"
-.TH ATANH 3 2021-03-22 GNU "Linux Programmer's Manual"
-.SH NAME
-atanh, atanhf, atanhl \- inverse hyperbolic tangent function
-.SH LIBRARY
-Math library
-.RI ( libm ", " \-lm )
-.SH SYNOPSIS
-.nf
-.B #include <math.h>
-.PP
-.BI "double atanh(double " x );
-.BI "float atanhf(float " x );
-.BI "long double atanhl(long double " x );
-.PP
-.fi
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.PP
-.BR atanh ():
-.nf
-    _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
-        || _XOPEN_SOURCE >= 500
-.\"    || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
-        || /* Since glibc 2.19: */ _DEFAULT_SOURCE
-        || /* Glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
-.fi
-.PP
-.BR atanhf (),
-.BR atanhl ():
-.nf
-    _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
-        || /* Since glibc 2.19: */ _DEFAULT_SOURCE
-        || /* Glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
-.fi
-.SH DESCRIPTION
-These functions calculate the inverse hyperbolic tangent of
-.IR x ;
-that is the value whose hyperbolic tangent is
-.IR x .
-.SH RETURN VALUE
-On success, these functions return the inverse hyperbolic tangent of
-.IR x .
-.PP
-If
-.I x
-is a NaN, a NaN is returned.
-.PP
-If
-.I x
-is +0 (\-0), +0 (\-0) is returned.
-.PP
-If
-.I x
-is +1 or \-1,
-a pole error occurs,
-and the functions return
-.BR HUGE_VAL ,
-.BR HUGE_VALF ,
-or
-.BR HUGE_VALL ,
-respectively, with the mathematically correct sign.
-.PP
-If the absolute value of
-.I x
-is greater than 1,
-a domain error occurs,
-and a NaN is returned.
-.\"
-.\" POSIX.1-2001 documents an optional range error for subnormal x;
-.\" glibc 2.8 does not do this.
-.SH ERRORS
-See
-.BR math_error (7)
-for information on how to determine whether an error has occurred
-when calling these functions.
-.PP
-The following errors can occur:
-.TP
-Domain error: \fIx\fP less than \-1 or greater than +1
-.I errno
-is set to
-.BR EDOM .
-An invalid floating-point exception
-.RB ( FE_INVALID )
-is raised.
-.TP
-Pole error: \fIx\fP is +1 or \-1
-.I errno
-is set to
-.B ERANGE
-(but see BUGS).
-A divide-by-zero floating-point exception
-.RB ( FE_DIVBYZERO )
-is raised.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.ad l
-.nh
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface      Attribute       Value
-T{
-.BR atanh (),
-.BR atanhf (),
-.BR atanhl ()
-T}     Thread safety   MT-Safe
-.TE
-.hy
-.ad
-.sp 1
-.SH STANDARDS
-C99, POSIX.1-2001, POSIX.1-2008.
-.PP
-The variant returning
-.I double
-also conforms to
-SVr4, 4.3BSD.
-.SH BUGS
-In glibc 2.9 and earlier,
-.\" Bug: http://sources.redhat.com/bugzilla/show_bug.cgi?id=6759
-.\" This can be seen in sysdeps/ieee754/k_standard.c
-when a pole error occurs,
-.I errno
-is set to
-.B EDOM
-instead of the POSIX-mandated
-.BR ERANGE .
-Since version 2.10, glibc does the right thing.
-.SH SEE ALSO
-.BR acosh (3),
-.BR asinh (3),
-.BR catanh (3),
-.BR cosh (3),
-.BR sinh (3),
-.BR tanh (3)