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

23       These functions shall compute the  inverse  hyperbolic  sine  of  their
24       argument x.
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26       An  application  wishing to check for error situations should set errno
27       to zero and  call  feclearexcept(FE_ALL_EXCEPT)  before  calling  these
28       functions.   On return, if errno is non-zero or fetestexcept(FE_INVALID
29       | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an error  has
30       occurred.
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RETURN VALUE

33       Upon  successful  completion,  these functions shall return the inverse
34       hyperbolic sine of their argument.
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36       If x is NaN, a NaN shall be returned.
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38       If x is ±0, or ±Inf, x shall be returned.
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40       If x is subnormal, a range error may occur and x should be returned.
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ERRORS

43       These functions may fail if:
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45       Range Error
46              The value of x is subnormal.
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48       If the integer expression (math_errhandling & MATH_ERRNO) is  non-zero,
49       then  errno  shall  be  set  to  [ERANGE].  If  the  integer expression
50       (math_errhandling & MATH_ERREXCEPT) is  non-zero,  then  the  underflow
51       floating-point exception shall be raised.
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54       The following sections are informative.
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EXAMPLES

57       None.
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APPLICATION USAGE

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

65       None.
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FUTURE DIRECTIONS

68       None.
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SEE ALSO

71       feclearexcept(), fetestexcept(), sinh(), the Base Definitions volume of
72       IEEE Std 1003.1-2001, Section 4.18, Treatment of Error  Conditions  for
73       Mathematical Functions, <math.h>
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76       Portions  of  this text are reprinted and reproduced in electronic form
77       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
78       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
79       Specifications Issue 6, Copyright (C) 2001-2003  by  the  Institute  of
80       Electrical  and  Electronics  Engineers, Inc and The Open Group. In the
81       event of any discrepancy between this version and the original IEEE and
82       The  Open Group Standard, the original IEEE and The Open Group Standard
83       is the referee document. The original Standard can be  obtained  online
84       at http://www.opengroup.org/unix/online.html .
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88IEEE/The Open Group                  2003                            ASINH(3P)
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