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     The log and log10 functions calculate the natural logarithm and
     base-10 logarithm of <x>, respectively.
 
     The ...l functions use the 80-bit long double form of arguments
     and return values. In all other respects, they are identical to
     the regular functions.
 
     Return Value
 
     These functions return the logarithm result. If <x> is negative,
     the functions print a DOMAIN error message to stderr, return the
     value -HUGE_VAL, and set errno to EDOM. If <x> is 0, the functions
     print a SING error message to stderr, return the value -HUGE_VAL,
     and set errno to ERANGE.
 
     Error handling can be modified by using the matherr (or _matherrl)
     routine.
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