This is xnu-8019. See this file in:
___sandbox_me	___mac_execve
___sandbox_mm	___mac_mount
___sandbox_ms	___mac_syscall
___sandbox_msp	___mac_set_proc
__exit	___exit
_accessx_np	___access_extended
_getsgroups_np	___getsgroups
_getwgroups_np	___getwgroups
# initgroups wrapper is defined in Libinfo
_initgroups
_posix_madvise	___madvise
_pthread_getugid_np	___gettid
_pthread_setugid_np	___settid
_setsgroups_np	___setsgroups
_setwgroups_np	___setwgroups
_wait4	___wait4_nocancel