This is xnu-8019. See this file in:
Directory listing for xnu-8019//libsyscall/wrappers/legacy
accept.c
bind.c
connect.c
getattrlist.c
getaudit.c
getpeername.c
getsockname.c
kill.c
lchown.c
listen.c
mprotect.c
msync.c
munmap.c
recvfrom.c
recvmsg.c
select-pre1050.c
select.c
sendmsg.c
sendto.c
setattrlist.c
sigsuspend.c
socketpair.c