FTRUNCATE (man3p)
ftruncate — truncate a file to a specified length
ftruncate — truncate a file to a specified length
getpmsg — receive next message from a STREAMS file
sinl — sine function
posix_spawnattr_setpgroup — set the spawn-pgroup attribute of a spawn attributes object (ADVANCED REALTIME)
sched_get_priority_max, sched_get_priority_min — get priority limits (REALTIME)
lldiv — compute quotient and remainder of a long division
pthread_spin_lock, pthread_spin_trylock — lock a spin lock object
getc_unlocked, getchar_unlocked, putc_unlocked, putchar_unlocked — stdio with explicit client locking
ftw — traverse (walk) a file tree
_toupper — transliterate lowercase characters to uppercase