ISINF (man3p)
isinf — test for infinity
isinf — test for infinity
sigdelset — delete a signal from a signal set
gethostname — get name of current host
fsync — synchronize changes to a file
modf, modff, modfl — decompose a floating-point number
frexp, frexpf, frexpl — extract mantissa and exponent from a double precision number
abort — generate an abnormal process abort
setstate — switch pseudo-random number generator state arrays
isprint, isprint_l — test for a printable character
getpid — get the process ID