SETITIMER (man3p)
setitimer — set the value of an interval timer
setitimer — set the value of an interval timer
posix_memalign — aligned memory allocation (ADVANCED REALTIME)
erff, erfl — error functions
log, logf, logl — natural logarithm function
getrlimit, setrlimit — control maximum resource consumption
dprintf, fprintf, printf, snprintf, sprintf — print formatted output
pthread_attr_setstacksize — set the stacksize attribute
putenv — change or add a value to an environment
sigtimedwait, sigwaitinfo — wait for queued signals
mkdtemp, mkstemp — create a unique directory or file