Adding upstream version 4.22.0.upstream/4.22.0

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

1 files changed, 160 insertions, 0 deletions

diff --git a/upstream/archlinux/man3p/lgamma.3p b/upstream/archlinux/man3p/lgamma.3p
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+'\" et
+.TH LGAMMA "3P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\"
+.SH PROLOG
+This manual page is part of the POSIX Programmer's Manual.
+The Linux implementation of this interface may differ (consult
+the corresponding Linux manual page for details of Linux behavior),
+or the interface may not be implemented on Linux.
+.\"
+.EQ
+delim $$
+.EN
+.SH NAME
+lgamma,
+lgammaf,
+lgammal,
+signgam
+\(em log gamma function
+.SH SYNOPSIS
+.LP
+.nf
+#include <math.h>
+.P
+double lgamma(double \fIx\fP);
+float lgammaf(float \fIx\fP);
+long double lgammal(long double \fIx\fP);
+extern int signgam;
+.fi
+.SH DESCRIPTION
+The functionality described on this reference page is aligned with the
+ISO\ C standard. Any conflict between the requirements described here and the
+ISO\ C standard is unintentional. This volume of POSIX.1\(hy2017 defers to the ISO\ C standard.
+.P
+These functions shall compute
+$log_ e" " \(br \(*G ( ^ x ) \(br$
+where $\(*G ( ^ x )$ is defined as
+$int from 0 to inf e"^" " "{ - t } t"^" " "{ x - 1 } dt$.
+The argument
+.IR x
+need not be a non-positive integer ($\(*G( ^ x )$ is defined over
+the reals, except the non-positive integers).
+.P
+If
+.IR x
+is NaN, \-Inf, or a negative integer, the value of
+.IR signgam
+is unspecified.
+.P
+These functions need not be thread-safe.
+.P
+An application wishing to check for error situations should set
+.IR errno
+to zero and call
+.IR feclearexcept (FE_ALL_EXCEPT)
+before calling these functions. On return, if
+.IR errno
+is non-zero or \fIfetestexcept\fR(FE_INVALID | FE_DIVBYZERO |
+FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an error has occurred.
+.SH "RETURN VALUE"
+Upon successful completion, these functions shall return the
+logarithmic gamma of
+.IR x .
+.P
+If
+.IR x
+is a non-positive integer, a pole error shall occur and
+\fIlgamma\fR(),
+\fIlgammaf\fR(),
+and
+\fIlgammal\fR()
+shall return +HUGE_VAL, +HUGE_VALF, and +HUGE_VALL, respectively.
+.P
+If the correct value would cause overflow, a range error shall occur
+and
+\fIlgamma\fR(),
+\fIlgammaf\fR(),
+and
+\fIlgammal\fR()
+shall return \(+-HUGE_VAL, \(+-HUGE_VALF, and \(+-HUGE_VALL (having the
+same sign as the correct value), respectively.
+.P
+If
+.IR x
+is NaN, a NaN shall be returned.
+.P
+If
+.IR x
+is 1 or 2, +0 shall be returned.
+.P
+If
+.IR x
+is \(+-Inf, +Inf shall be returned.
+.SH ERRORS
+These functions shall fail if:
+.IP "Pole\ Error" 12
+The
+.IR x
+argument is a negative integer or zero.
+.RS 12 
+.P
+If the integer expression (\fImath_errhandling\fR & MATH_ERRNO) is
+non-zero, then
+.IR errno
+shall be set to
+.BR [ERANGE] .
+If the integer expression (\fImath_errhandling\fR & MATH_ERREXCEPT) is
+non-zero, then the divide-by-zero floating-point exception shall be
+raised.
+.RE
+.IP "Range\ Error" 12
+The result overflows.
+.RS 12 
+.P
+If the integer expression (\fImath_errhandling\fR & MATH_ERRNO) is
+non-zero, then
+.IR errno
+shall be set to
+.BR [ERANGE] .
+If the integer expression (\fImath_errhandling\fR & MATH_ERREXCEPT) is
+non-zero, then the overflow floating-point exception shall be raised.
+.RE
+.LP
+.IR "The following sections are informative."
+.SH EXAMPLES
+None.
+.SH "APPLICATION USAGE"
+On error, the expressions (\fImath_errhandling\fR & MATH_ERRNO) and
+(\fImath_errhandling\fR & MATH_ERREXCEPT) are independent of each
+other, but at least one of them must be non-zero.
+.SH RATIONALE
+None.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "\fIexp\fR\^(\|)",
+.IR "\fIfeclearexcept\fR\^(\|)",
+.IR "\fIfetestexcept\fR\^(\|)",
+.IR "\fIisnan\fR\^(\|)"
+.P
+The Base Definitions volume of POSIX.1\(hy2017,
+.IR "Section 4.20" ", " "Treatment of Error Conditions for Mathematical Functions",
+.IR "\fB<math.h>\fP"
+.\"
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1-2017, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 7, 2018 Edition,
+Copyright (C) 2018 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group.
+In the event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .
+.PP
+Any typographical or formatting errors that appear
+in this page are most likely
+to have been introduced during the conversion of the source files to
+man page format. To report such errors, see
+https://www.kernel.org/doc/man-pages/reporting_bugs.html .