1ASINH(3P)                  POSIX Programmer's Manual                 ASINH(3P)
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PROLOG

6       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
7       implementation of this interface may differ (consult the  corresponding
8       Linux  manual page for details of Linux behavior), or the interface may
9       not be implemented on Linux.
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11

NAME

13       asinh, asinhf, asinhl — inverse hyperbolic sine functions
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SYNOPSIS

16       #include <math.h>
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18       double asinh(double x);
19       float asinhf(float x);
20       long double asinhl(long double x);
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DESCRIPTION

23       The functionality described on this reference page is aligned with  the
24       ISO C  standard.  Any  conflict between the requirements described here
25       and the ISO C standard is unintentional. This  volume  of  POSIX.1‐2008
26       defers to the ISO C standard.
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28       These  functions  shall  compute  the  inverse hyperbolic sine of their
29       argument x.
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31       An application wishing to check for error situations should  set  errno
32       to  zero  and  call  feclearexcept(FE_ALL_EXCEPT)  before calling these
33       functions. On return, if errno is non-zero or fetestexcept(FE_INVALID |
34       FE_DIVBYZERO  |  FE_OVERFLOW  | FE_UNDERFLOW) is non-zero, an error has
35       occurred.
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RETURN VALUE

38       Upon successful completion, these functions shall  return  the  inverse
39       hyperbolic sine of their argument.
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41       If x is NaN, a NaN shall be returned.
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43       If x is ±0, or ±Inf, x shall be returned.
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45       If x is subnormal, a range error may occur
46       and x should be returned.
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48       If  x  is not returned, asinh(), asinhf(), and asinhl() shall return an
49       implementation-defined value no  greater  in  magnitude  than  DBL_MIN,
50       FLT_MIN, and LDBL_MIN, respectively.
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ERRORS

53       These functions may fail if:
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55       Range Error The value of x is subnormal.
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57                   If  the  integer expression (math_errhandling & MATH_ERRNO)
58                   is non-zero, then errno shall be set to [ERANGE].   If  the
59                   integer  expression  (math_errhandling & MATH_ERREXCEPT) is
60                   non-zero, then the underflow floating-point exception shall
61                   be raised.
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63       The following sections are informative.
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EXAMPLES

66       None.
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APPLICATION USAGE

69       On   error,   the   expressions  (math_errhandling  &  MATH_ERRNO)  and
70       (math_errhandling & MATH_ERREXCEPT) are independent of each other,  but
71       at least one of them must be non-zero.
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RATIONALE

74       None.
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FUTURE DIRECTIONS

77       None.
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SEE ALSO

80       feclearexcept(), fetestexcept(), sinh()
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82       The Base Definitions volume of POSIX.1‐2008, Section 4.19, Treatment of
83       Error Conditions for Mathematical Functions, <math.h>
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86       Portions of this text are reprinted and reproduced in  electronic  form
87       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
88       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
89       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
90       cal and Electronics Engineers,  Inc  and  The  Open  Group.   (This  is
91       POSIX.1-2008  with  the  2013  Technical Corrigendum 1 applied.) In the
92       event of any discrepancy between this version and the original IEEE and
93       The  Open Group Standard, the original IEEE and The Open Group Standard
94       is the referee document. The original Standard can be  obtained  online
95       at http://www.unix.org/online.html .
96
97       Any  typographical  or  formatting  errors that appear in this page are
98       most likely to have been introduced during the conversion of the source
99       files  to  man page format. To report such errors, see https://www.ker
100       nel.org/doc/man-pages/reporting_bugs.html .
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104IEEE/The Open Group                  2013                            ASINH(3P)
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