STRLEN (man3p)
strlen, strnlen — get length of fixed size string
strlen, strnlen — get length of fixed size string
endnetent, getnetbyaddr, getnetbyname, getnetent, setnetent — network database functions
pause — suspend the thread until a signal is received
pthread_attr_setinheritsched — set the inheritsched attribute (REALTIME THREADS)
sighold, sigignore, sigpause, sigrelse, sigset — signal management
mq_notify — notify process that a message is available (REALTIME)
ccosl — complex cosine functions
pthread_condattr_getclock, pthread_condattr_setclock — get and set the clock selection condition variable attribute
posix_trace_trid_eventid_open — open a trace event type identifier (TRACING)
iswalnum, iswalnum_l — test for an alphanumeric wide-character code