Merging upstream version 6.8.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 150 insertions, 0 deletions

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+'\" t
+.\" Copyright 1995 Jim Van Zandt <jrv@vanzandt.mv.com>
+.\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk
+.\"     <mtk.manpages@gmail.com>
+.\"
+.\" SPDX-License-Identifier: Linux-man-pages-copyleft
+.\"
+.\" Modified 2002-07-27 by Walter Harms
+.\" 	(walter.harms@informatik.uni-oldenburg.de)
+.TH log1p 3 2024-05-02 "Linux man-pages (unreleased)"
+.SH NAME
+log1p, log1pf, log1pl \-  logarithm of 1 plus argument
+.SH LIBRARY
+Math library
+.RI ( libm ", " \-lm )
+.SH SYNOPSIS
+.nf
+.B #include <math.h>
+.P
+.BI "double log1p(double " x );
+.BI "float log1pf(float " x );
+.BI "long double log1pl(long double " x );
+.P
+.fi
+.RS -4
+Feature Test Macro Requirements for glibc (see
+.BR feature_test_macros (7)):
+.RE
+.P
+.nf
+.BR log1p ():
+    _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
+.P
+.BR log1pf (),
+.BR log1pl ():
+.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 a value equivalent to
+.P
+.nf
+    log (1 + \fIx\fP)
+.fi
+.P
+The result is computed in a way
+that is accurate even if the value of
+.I x
+is near zero.
+.SH RETURN VALUE
+On success, these functions return the natural logarithm of
+.IR "(1\ +\ x)" .
+.P
+If
+.I x
+is a NaN,
+a NaN is returned.
+.P
+If
+.I x
+is positive infinity, positive infinity is returned.
+.P
+If
+.I x
+is \-1, a pole error occurs,
+and the functions return
+.RB \- HUGE_VAL ,
+.RB \- HUGE_VALF ,
+or
+.RB \- HUGE_VALL ,
+respectively.
+.P
+If
+.I x
+is less than \-1 (including negative infinity),
+a domain error occurs,
+and a NaN (not a number) is returned.
+.\" POSIX.1 specifies a possible range error if x is subnormal
+.\" glibc 2.8 doesn't do this
+.SH ERRORS
+See
+.BR math_error (7)
+for information on how to determine whether an error has occurred
+when calling these functions.
+.P
+The following errors can occur:
+.TP
+Domain error: \fIx\fP is less than \-1
+.I errno
+is set to
+.B EDOM
+(but see BUGS).
+An invalid floating-point exception
+.RB ( FE_INVALID )
+is raised.
+.TP
+Pole error: \fIx\fP is \-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).
+.TS
+allbox;
+lbx lb lb
+l l l.
+Interface	Attribute	Value
+T{
+.na
+.nh
+.BR log1p (),
+.BR log1pf (),
+.BR log1pl ()
+T}	Thread safety	MT-Safe
+.TE
+.SH STANDARDS
+C11, POSIX.1-2008.
+.SH HISTORY
+C99, POSIX.1-2001.
+.\" BSD
+.SH BUGS
+Before glibc 2.22, the glibc implementation did not set
+.\" https://www.sourceware.org/bugzilla/show_bug.cgi?id=6792
+.I errno
+to
+.B EDOM
+when a domain error occurred.
+.P
+Before glibc 2.22, the glibc implementation did not set
+.\" https://www.sourceware.org/bugzilla/show_bug.cgi?id=6792
+.I errno
+to
+.B ERANGE
+when a range error occurred.
+.SH SEE ALSO
+.BR exp (3),
+.BR expm1 (3),
+.BR log (3)