ftruncate — truncate a file to a specified length
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)
getc_unlocked, getchar_unlocked, putc_unlocked, putchar_unlocked — stdio with explicit client locking
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