POSIX_SPAWNATTR_SETSIGMASK (man3p)
posix_spawnattr_setsigmask — set the spawn-sigmask attribute of a spawn attributes object (ADVANCED REALTIME)
posix_spawnattr_setsigmask — set the spawn-sigmask attribute of a spawn attributes object (ADVANCED REALTIME)
if_indextoname — map a network interface index to its corresponding name
getnameinfo — get name information
strcspn — get the length of a complementary substring
setpgid — set process group ID for job control
erand48 — generate uniformly distributed pseudo-random numbers
pthread_setcancelstate, pthread_setcanceltype, pthread_testcancel — set cancelability state
rmdir — remove a directory
getgroups — get supplementary group IDs
pthread_spin_unlock — unlock a spin lock object