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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NAME

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

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

22       The functionality described on this reference page is aligned with  the
23       ISO C  standard.  Any  conflict between the requirements described here
24       and the ISO C standard is unintentional. This  volume  of  POSIX.1‐2017
25       defers to the ISO C standard.
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27       These  functions  shall  compute  the  inverse hyperbolic sine of their
28       argument x.
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30       An application wishing to check for error situations should  set  errno
31       to  zero  and  call  feclearexcept(FE_ALL_EXCEPT)  before calling these
32       functions. On return, if errno is non-zero or fetestexcept(FE_INVALID |
33       FE_DIVBYZERO  |  FE_OVERFLOW  | FE_UNDERFLOW) is non-zero, an error has
34       occurred.
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RETURN VALUE

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

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

65       None.
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APPLICATION USAGE

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

73       None.
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FUTURE DIRECTIONS

76       None.
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SEE ALSO

79       feclearexcept(), fetestexcept(), sinh()
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81       The Base Definitions volume of POSIX.1‐2017, Section 4.20, Treatment of
82       Error Conditions for Mathematical Functions, <math.h>
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85       Portions of this text are reprinted and reproduced in  electronic  form
86       from  IEEE Std 1003.1-2017, Standard for Information Technology -- Por‐
87       table Operating System Interface (POSIX), The Open Group Base  Specifi‐
88       cations  Issue  7, 2018 Edition, Copyright (C) 2018 by the Institute of
89       Electrical and Electronics Engineers, Inc and The Open Group.   In  the
90       event of any discrepancy between this version and the original IEEE and
91       The Open Group Standard, the original IEEE and The Open Group  Standard
92       is  the  referee document. The original Standard can be obtained online
93       at http://www.opengroup.org/unix/online.html .
94
95       Any typographical or formatting errors that appear  in  this  page  are
96       most likely to have been introduced during the conversion of the source
97       files to man page format. To report such errors,  see  https://www.ker‐
98       nel.org/doc/man-pages/reporting_bugs.html .
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102IEEE/The Open Group                  2017                            ASINH(3P)
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