CABS (man3p)
cabs, cabsf, cabsl — return a complex absolute value
cabs, cabsf, cabsl — return a complex absolute value
ctanh, ctanhf, ctanhl — complex hyperbolic tangent functions
telldir — current location of a named directory stream
pipe — create an interprocess channel
ctan, ctanf, ctanl — complex tangent functions
copysign, copysignf, copysignl — number manipulation function
posix_typed_mem_get_info — query typed memory information (ADVANCED REALTIME)
semget — get set of XSI semaphores
pthread_barrierattr_setpshared — set the process-shared attribute of the barrier attributes object
encrypt — encoding function (CRYPT)