dlinfo.3: ATTRIBUTES: Note function that is thread-safe

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

.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
.\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk
.\"     <mtk.manpages@gmail.com>
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.\" 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 2002-07-25 by Walter Harms
.\" 	(walter.harms@informatik.uni-oldenburg.de)
.\"
.TH ASIN 3 2015-04-19 "" "Linux Programmer's Manual"
.SH NAME
asin, asinf, asinl \- arc sine function
.SH SYNOPSIS
.nf
.B #include <math.h>
.sp
.BI "double asin(double " x );
.br
.BI "float asinf(float " x );
.br
.BI "long double asinl(long double " x );
.fi
.sp
Link with \fI\-lm\fP.
.sp
.in -4n
Feature Test Macro Requirements for glibc (see
.BR feature_test_macros (7)):
.in
.sp
.ad l
.BR asinf (),
.BR asinl ():
.RS 4
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE ||
_POSIX_C_SOURCE\ >=\ 200112L;
.br
or
.I cc\ -std=c99
.RE
.ad b
.SH DESCRIPTION
These functions calculate the principal value of the arc sine of
.IR x ;
that is the value whose sine is
.IR x .
.SH RETURN VALUE
On success, these functions return the principal value of the arc sine of
.IR x
in radians; the return value is in the range [\-pi/2,\ pi/2].

If
.I x
is a NaN, a NaN is returned.

If
.I x
is +0 (\-0),
+0 (\-0) is returned.

If
.I x