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-'\" t
-.\" 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 1995-08-14 by Arnt Gulbrandsen <agulbra@troll.no>
-.\" Modified 2002-07-27 by Walter Harms
-.\" 	(walter.harms@informatik.uni-oldenburg.de)
-.\"
-.TH log 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-log, logf, logl \- natural logarithmic function
-.SH LIBRARY
-Math library
-.RI ( libm ", " \-lm )
-.SH SYNOPSIS
-.nf
-.B #include <math.h>
-.PP
-.BI "double log(double " x );
-.BI "float logf(float " x );
-.BI "long double logl(long double " x );
-.fi
-.PP
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.PP
-.BR logf (),
-.BR logl ():
-.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 return the natural logarithm of
-.IR x .
-.SH RETURN VALUE
-On success, these functions return the natural logarithm of
-.IR x .
-.PP
-If
-.I x
-is a NaN,
-a NaN is returned.
-.PP
-If
-.I x
-is 1, the result is +0.
-.PP
-If
-.I x
-is positive infinity,
-positive infinity is returned.
-.PP
-If
-.I x
-is zero,
-then a pole error occurs, and the functions return
-.RB \- HUGE_VAL ,
-.RB \- HUGE_VALF ,
-or
-.RB \- HUGE_VALL ,
-respectively.
-.PP
-If
-.I x
-is negative (including negative infinity), then
-a domain error occurs, and a NaN (not a number) is returned.
-.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 is negative
-.I errno
-is set to
-.BR EDOM .
-An invalid floating-point exception
-.RB ( FE_INVALID )
-is raised.
-.TP
-Pole error: \fIx\fP is zero
-.I errno
-is set to
-.BR ERANGE .
-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 log (),
-.BR logf (),
-.BR logl ()
-T}	Thread safety	MT-Safe
-.TE
-.hy
-.ad
-.sp 1
-.SH STANDARDS
-C11, POSIX.1-2008.
-.SH HISTORY
-C99, POSIX.1-2001.
-.PP
-The variant returning
-.I double
-also conforms to
-SVr4, 4.3BSD, C89.
-.SH BUGS
-In glibc 2.5 and earlier,
-taking the
-.BR log ()
-of a NaN produces a bogus invalid floating-point
-.RB ( FE_INVALID )
-exception.
-.SH SEE ALSO
-.BR cbrt (3),
-.BR clog (3),
-.BR log10 (3),
-.BR log1p (3),
-.BR log2 (3),
-.BR sqrt (3)