This is xnu-8019. See this file in:
Directory listing for xnu-8019//osfmk/mach
Makefile
arcade_register.defs
arcade_upcall.defs
arm/
arm64/
audit_triggers.defs
audit_triggers_types.h
boolean.h
bootstrap.h
clock.defs
clock_priv.defs
clock_reply.defs
clock_types.defs
clock_types.h
coalition.h
coalition_notification.defs
dyld_kernel.h
dyld_kernel_fixups.h
error.h
events_info.h
exc.defs
exception.h
exception_types.h
fairplayd_notification.defs
host_info.h
host_notify.h
host_notify_reply.defs
host_priv.defs
host_reboot.h
host_security.defs
host_special_ports.h
i386/
iocompressionstats_notification.defs
kern_return.h
kmod.h
ktrace_background.defs
ledger.defs
lock_set.defs
mach.h
mach.modulemap
mach_eventlink.defs
mach_eventlink_types.h
mach_exc.defs
mach_host.defs
mach_interface.h
mach_notify.defs
mach_param.h
mach_port.defs
mach_private.modulemap
mach_syscalls.h
mach_test_upcall.defs
mach_time.h
mach_traps.h
mach_types.defs
mach_types.h
mach_vm.defs
mach_voucher.defs
mach_voucher_attr_control.defs
mach_voucher_types.h
machine/
machine.h
memory_entry.defs
memory_object.defs
memory_object.h
memory_object_control.defs
memory_object_default.defs
memory_object_types.h
message.h
mig.h
mig_errors.h
mig_log.h
mig_strncpy_zerofill_support.h
mig_voucher_support.h
mk_timer.h
mk_traps.h
msg_type.h
ndr.h
notify.defs
notify.h
policy.h
port.h
processor.defs
processor_info.h
processor_set.defs
prof.defs
prof_types.h
resource_monitors.h
resource_notify.defs
restartable.defs
rpc.h
sdt.h
semaphore.defs
semaphore.h
sfi_class.h
shared_memory_server.h
shared_region.h
std_types.defs
std_types.h
sync_policy.h
syscall_sw.h
sysdiagnose_notification.defs
task.defs
task_access.defs
task_info.h
task_inspect.h
task_ledger.h
task_policy.h
task_special_ports.h
telemetry_notification.defs
thread_act.defs
thread_info.h
thread_policy.h
thread_special_ports.h
thread_status.h
thread_switch.h
time_value.h
upl.defs
vfs_nspace.defs
vm32_map.defs
vm_attributes.h
vm_behavior.h
vm_inherit.h
vm_map.defs
vm_param.h
vm_prot.h
vm_purgable.h
vm_region.h
vm_statistics.h
vm_sync.h
vm_types.h