LOG1P (man3p)
log1p, log1pf, log1pl — compute a natural logarithm
log1p, log1pf, log1pl — compute a natural logarithm
closelog, openlog, setlogmask, syslog — control system log
wmemset — set wide characters in memory
atof — convert a string to a double-precision number
sigfillset — initialize and fill a signal set
y0, y1, yn — Bessel functions of the second kind
munlock — unlock a range of process address space
iswdigit, iswdigit_l — test for a decimal digit wide-character code
cfgetospeed — get output baud rate
wcstok — split a wide-character string into tokens