GETCHAR_UNLOCKED (man3p)
getchar_unlocked — stdio with explicit client locking
getchar_unlocked — stdio with explicit client locking
pthread_cancel — cancel execution of a thread
sigqueue — queue a signal to a process
shm_unlink — remove a shared memory object (REALTIME)
fcntl — file control
ilogb, ilogbf, ilogbl — return an unbiased exponent
tmpnam — create a name for a temporary file
setbuf — assign buffering to a stream
strtoul, strtoull — convert a string to an unsigned long
random — generate pseudo-random number