log1pl man page on OpenIndiana

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log1p(3M)		Mathematical Library Functions		     log1p(3M)

NAME
       log1p, log1pf, log1pl - compute natural logarithm

SYNOPSIS
       c99 [ flag... ] file... -lm [ library... ]
       #include <math.h>

       double log1p(double x);

       float log1pf(float x);

       long double log1pl(long double x);

DESCRIPTION
       These functions compute log(e)(1.0 + x).

RETURN VALUES
       Upon  successful	 completion,  these functions return the natural loga‐
       rithm of 1.0 + x.

       If x is −1, a pole error occurs and  log1p(),  log1pf(),	 and  log1pl()
       return −HUGE_VAL, −HUGE_VALF, and −HUGE_VALL, respectively.

       For finite values of x that are less than −1, or if x is −Inf, a domain
       error occurs and a NaN is returned.

       If x is NaN, a NaN is returned.

       If x is ±0 or +Inf, x is returned.

       For exceptional cases, matherr(3M) tabulates the values to be  returned
       by log1p() as specified by SVID3 and XPG3.

ERRORS
       These functions will fail if:

       Domain Error    The finite value of x is less than −1, or x is -Inf.

		       If   the	  integer   expression	 (math_errhandling   &
		       MATH_ERREXCEPT) is non-zero, the invalid floating-point
		       exception is raised.

		       The log1p() function sets errno to EDOM if the value of
		       x is less than −1.

       Pole Error      The value of x is −1.

		       If   the	  integer   expression	 (math_errhandling   &
		       MATH_ERREXCEPT)	is non-zero, the divide-by-zero float‐
		       ing-point exception is raised.

USAGE
       An application wanting to check for exceptions should  call  feclearex‐
       cept(FE_ALL_EXCEPT)  before  calling  these  functions.	On  return, if
       fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is
       non-zero,  an  exception	 has been raised. An application should either
       examine the return value or check the floating point exception flags to
       detect exceptions.

       An  application	can  also  set	errno  to 0 before calling log1p(). On
       return, if errno is non-zero, an error has occurred. The	 log1pf()  and
       log1pl() functions do not set errno.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       ┌─────────────────────────────┬─────────────────────────────┐
       │      ATTRIBUTE TYPE	     │	    ATTRIBUTE VALUE	   │
       ├─────────────────────────────┼─────────────────────────────┤
       │Interface Stability	     │Committed			   │
       ├─────────────────────────────┼─────────────────────────────┤
       │MT-Level		     │MT-Safe			   │
       ├─────────────────────────────┼─────────────────────────────┤
       │Standard		     │See standards(5).		   │
       └─────────────────────────────┴─────────────────────────────┘

SEE ALSO
       feclearexcept(3M),   fetestexcept(3M),  log(3M),	 math.h(3HEAD),	 math‐
       err(3M), attributes(5), standards(5)

SunOS 5.11			  12 Jul 2006			     log1p(3M)
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