golden hour

/usr/include/linux

File/Folder	Size	Actions
a.out.h	6.73 KB
acct.h	3.82 KB
acrn.h	16.29 KB
adb.h	1.11 KB
adfs_fs.h	993 B
affs_hardblocks.h	1.54 KB
agpgart.h	3.85 KB
aio_abi.h	3.32 KB
am437x-vpfe.h	3.59 KB
android	-
apm_bios.h	3.6 KB
arcfb.h	213 B
arm_sdei.h	2.69 KB
aspeed-lpc-ctrl.h	1.74 KB
aspeed-p2a-ctrl.h	1.86 KB
atalk.h	1023 B
atm.h	7.7 KB
atm_eni.h	648 B
atm_he.h	406 B
atm_idt77105.h	955 B
atm_nicstar.h	1.25 KB
atm_tcp.h	1.58 KB
atm_zatm.h	1.5 KB
atmapi.h	952 B
atmarp.h	1.27 KB
atmbr2684.h	3.19 KB
atmclip.h	576 B
atmdev.h	7.5 KB
atmioc.h	1.61 KB
atmlec.h	2.33 KB
atmmpc.h	4.13 KB
atmppp.h	639 B
atmsap.h	4.85 KB
atmsvc.h	1.81 KB
audit.h	21.06 KB
auto_dev-ioctl.h	4.87 KB
auto_fs.h	6.28 KB
auto_fs4.h	451 B
auxvec.h	1.56 KB
ax25.h	2.76 KB
batadv_packet.h	19.87 KB
batman_adv.h	16.49 KB
baycom.h	883 B
bcm933xx_hcs.h	419 B
bfs_fs.h	1.86 KB
binfmts.h	776 B
bits.h	447 B
blkpg.h	904 B
blktrace_api.h	4.59 KB
blkzoned.h	6.34 KB
bpf.h	272.11 KB
bpf_common.h	1.33 KB
bpf_perf_event.h	529 B
bpfilter.h	465 B
bpqether.h	981 B
bsg.h	2.44 KB
bt-bmc.h	572 B
btf.h	5.46 KB
btrfs.h	29.85 KB
btrfs_tree.h	25.22 KB
byteorder	-
cachefiles.h	1.61 KB
caif	-
can	-
can.h	11.03 KB
capability.h	13.17 KB
capi.h	3.05 KB
cciss_defs.h	3.2 KB
cciss_ioctl.h	2.7 KB
ccs.h	767 B
cdrom.h	28.87 KB
cec-funcs.h	53.14 KB
cec.h	40.47 KB
cfm_bridge.h	1.42 KB
cgroupstats.h	2.17 KB
chio.h	5.16 KB
cifs	-
close_range.h	377 B
cm4000_cs.h	1.76 KB
cn_proc.h	4.05 KB
coda.h	17.79 KB
coff.h	12.25 KB
connector.h	2.2 KB
const.h	987 B
coresight-stm.h	747 B
cramfs_fs.h	3.47 KB
cryptouser.h	5.2 KB
cuda.h	905 B
cxl_mem.h	7.73 KB
cycx_cfm.h	2.92 KB
dcbnl.h	24.7 KB
dccp.h	6.29 KB
devlink.h	22.3 KB
dlm.h	2.49 KB
dlm_device.h	2.48 KB
dlm_netlink.h	1.13 KB
dlm_plock.h	894 B
dlmconstants.h	4.96 KB
dm-ioctl.h	11.48 KB
dm-log-userspace.h	14.83 KB
dma-buf.h	5.12 KB
dma-heap.h	1.36 KB
dn.h	4.53 KB
dns_resolver.h	3.86 KB
dpll.h	7.19 KB
dqblk_xfs.h	9.17 KB
dvb	-
edd.h	5.47 KB
efs_fs_sb.h	2.17 KB
elf-em.h	2.57 KB
elf-fdpic.h	1.1 KB
elf.h	14.69 KB
errno.h	23 B
errqueue.h	1.94 KB
erspan.h	1.03 KB
ethtool.h	100.09 KB
ethtool_netlink.h	29.87 KB
eventfd.h	264 B
eventpoll.h	2.84 KB
f2fs.h	3.22 KB
fadvise.h	842 B
falloc.h	3.5 KB
fanotify.h	6.64 KB
fb.h	16.09 KB
fcntl.h	4.22 KB
fd.h	11.83 KB
fdreg.h	5.24 KB
fib_rules.h	1.99 KB
fiemap.h	2.71 KB
filter.h	2.16 KB
firewire-cdev.h	43.2 KB
firewire-constants.h	3.16 KB
fou.h	819 B
fpga-dfl.h	8.52 KB
fs.h	12.88 KB
fscrypt.h	6.41 KB
fsi.h	2.2 KB
fsl_hypervisor.h	7.13 KB
fsl_mc.h	734 B
fsmap.h	4.29 KB
fsverity.h	3.11 KB
fuse.h	25.36 KB
futex.h	5.98 KB
gameport.h	897 B
gen_stats.h	1.49 KB
genetlink.h	2.19 KB
genwqe	-
gfs2_ondisk.h	14.43 KB
gpio.h	19.46 KB
gsmmux.h	4.4 KB
gtp.h	734 B
handshake.h	1.61 KB
hash_info.h	971 B
hdlc	-
hdlc.h	637 B
hdlcdrv.h	2.84 KB
hdreg.h	22.17 KB
hid.h	2.04 KB
hiddev.h	6.2 KB
hidraw.h	1.95 KB
hpet.h	743 B
hsi	-
hsr_netlink.h	1.08 KB
hw_breakpoint.h	742 B
hyperv.h	10.89 KB
i2c-dev.h	1.83 KB
i2c.h	6.73 KB
i2o-dev.h	11.28 KB
i8k.h	1.49 KB
icmp.h	4.67 KB
icmpv6.h	4.2 KB
idxd.h	9.11 KB
if.h	10.67 KB
if_addr.h	1.84 KB
if_addrlabel.h	721 B
if_alg.h	1.53 KB
if_arcnet.h	3.63 KB
if_arp.h	6.41 KB
if_bonding.h	5.02 KB
if_bridge.h	20.18 KB
if_cablemodem.h	986 B
if_eql.h	1.32 KB
if_ether.h	8.21 KB
if_fc.h	1.7 KB
if_fddi.h	4.27 KB
if_hippi.h	4.14 KB
if_infiniband.h	1.22 KB
if_link.h	52.83 KB
if_ltalk.h	210 B
if_macsec.h	6.35 KB
if_packet.h	7.99 KB
if_phonet.h	424 B
if_plip.h	660 B
if_ppp.h	29 B
if_pppol2tp.h	3.23 KB
if_pppox.h	4.76 KB
if_slip.h	872 B
if_team.h	2.54 KB
if_tun.h	4 KB
if_tunnel.h	5.36 KB
if_vlan.h	1.79 KB
if_x25.h	881 B
if_xdp.h	4.89 KB
ife.h	351 B
igmp.h	2.99 KB
iio	-
ila.h	1.22 KB
in.h	10.15 KB
in6.h	7.36 KB
in_route.h	936 B
inet_diag.h	4.9 KB
inotify.h	3.21 KB
input-event-codes.h	29.5 KB
input.h	15.84 KB
io_uring.h	20.4 KB
ioctl.h	163 B
iommufd.h	28.39 KB
ioprio.h	4.08 KB
ip.h	4.7 KB
ip6_tunnel.h	1.91 KB
ip_vs.h	13.8 KB
ipc.h	2.05 KB
ipmi.h	15.08 KB
ipmi_bmc.h	488 B
ipmi_msgdefs.h	3.35 KB
ipmi_ssif_bmc.h	441 B
ipsec.h	947 B
ipv6.h	4.07 KB
ipv6_route.h	1.86 KB
ipx.h	2.29 KB
irqnr.h	104 B
isdn	-
iso_fs.h	6.33 KB
isst_if.h	14.92 KB
ivtv.h	2.95 KB
ivtvfb.h	1.18 KB
jffs2.h	6.66 KB
joystick.h	3.35 KB
kcm.h	822 B
kcmp.h	522 B
kcov.h	1.92 KB
kd.h	6.3 KB
kdev_t.h	383 B
kernel-page-flags.h	900 B
kernel.h	194 B
kernelcapi.h	1019 B
kexec.h	2.05 KB
keyboard.h	13.14 KB
keyctl.h	5.86 KB
kfd_ioctl.h	56.75 KB
kfd_sysfs.h	5.1 KB
kvm.h	46.76 KB
kvm_para.h	1001 B
l2tp.h	5.61 KB
landlock.h	10.14 KB
libc-compat.h	8.09 KB
limits.h	937 B
lirc.h	7.95 KB
llc.h	3.09 KB
loadpin.h	834 B
loop.h	3.32 KB
lp.h	4.09 KB
lsm.h	1.51 KB
lwtunnel.h	2.31 KB
magic.h	3.73 KB
major.h	4.55 KB
map_to_7segment.h	6.45 KB
matroxfb.h	1.43 KB
max2175.h	1.01 KB
mdio.h	23.78 KB
media-bus-format.h	6.75 KB
media.h	12.46 KB
mei.h	3.4 KB
mei_uuid.h	738 B
membarrier.h	9.14 KB
memfd.h	1.43 KB
mempolicy.h	2.51 KB
meye.h	2.47 KB
mii.h	9.27 KB
minix_fs.h	2.07 KB
misc	-
mman.h	1.75 KB
mmc	-
mmtimer.h	2.07 KB
module.h	293 B
mount.h	4.9 KB
mpls.h	2.25 KB
mpls_iptunnel.h	761 B
mptcp.h	3.67 KB
mptcp_pm.h	4.3 KB
mqueue.h	2.15 KB
mroute.h	5.78 KB
mroute6.h	4.81 KB
mrp_bridge.h	1.67 KB
msdos_fs.h	6.57 KB
msg.h	3.31 KB
mtio.h	7.98 KB
nbd-netlink.h	2.35 KB
nbd.h	3.77 KB
ncsi.h	4.71 KB
ndctl.h	6.67 KB
neighbour.h	5.91 KB
net.h	2.04 KB
net_dropmon.h	2.85 KB
net_namespace.h	715 B
net_tstamp.h	5.97 KB
netconf.h	614 B
netdev.h	5.39 KB
netdevice.h	2.2 KB
netfilter	-
netfilter.h	1.69 KB
netfilter_arp	-
netfilter_arp.h	445 B
netfilter_bridge	-
netfilter_bridge.h	1.14 KB
netfilter_decnet.h	1.72 KB
netfilter_ipv4	-
netfilter_ipv4.h	1.45 KB
netfilter_ipv6	-
netfilter_ipv6.h	1.35 KB
netlink.h	12.09 KB
netlink_diag.h	1.49 KB
netrom.h	807 B
nexthop.h	3.97 KB
nfc.h	10.95 KB
nfs.h	4.36 KB
nfs2.h	1.43 KB
nfs3.h	2.4 KB
nfs4.h	6.54 KB
nfs4_mount.h	1.89 KB
nfs_fs.h	1.62 KB
nfs_idmap.h	2.19 KB
nfs_mount.h	2.09 KB
nfsacl.h	718 B
nfsd	-
nfsd_netlink.h	1.95 KB
nilfs2_api.h	7.41 KB
nilfs2_ondisk.h	17.66 KB
nitro_enclaves.h	12.85 KB
nl80211.h	338.95 KB
nsfs.h	639 B
nubus.h	8 KB
nvme_ioctl.h	2.43 KB
nvram.h	532 B
omap3isp.h	20.36 KB
omapfb.h	5.78 KB
oom.h	511 B
openat2.h	1.42 KB
openvswitch.h	40.41 KB
packet_diag.h	1.63 KB
param.h	141 B
parport.h	3.56 KB
patchkey.h	892 B
pci.h	1.35 KB
pci_regs.h	60.58 KB
pcitest.h	920 B
perf_event.h	42.43 KB
personality.h	2.05 KB
pfkeyv2.h	10.32 KB
pfrut.h	7.8 KB
pg.h	2.34 KB
phantom.h	1.62 KB
phonet.h	4.57 KB
pidfd.h	256 B
pkt_cls.h	18.65 KB
pkt_sched.h	28.66 KB
pktcdvd.h	2.63 KB
pmu.h	5.32 KB
poll.h	22 B
posix_acl.h	1.22 KB
posix_acl_xattr.h	1.09 KB
posix_types.h	1.07 KB
ppdev.h	3.21 KB
ppp-comp.h	2.47 KB
ppp-ioctl.h	5.59 KB
ppp_defs.h	5.43 KB
pps.h	4.62 KB
pr.h	1.59 KB
prctl.h	10.81 KB
psample.h	2.57 KB
psci.h	5.02 KB
psp-dbc.h	5.16 KB
psp-sev.h	6.26 KB
ptp_clock.h	7.35 KB
ptrace.h	4.29 KB
qemu_fw_cfg.h	2.41 KB
qnx4_fs.h	2.27 KB
qnxtypes.h	624 B
qrtr.h	893 B
quota.h	6.16 KB
radeonfb.h	360 B
raid	-
random.h	1.38 KB
rds.h	10.91 KB
reboot.h	1.31 KB
reiserfs_fs.h	775 B
reiserfs_xattr.h	533 B
remoteproc_cdev.h	1.08 KB
resource.h	2.32 KB
rfkill.h	6.45 KB
rio_cm_cdev.h	3.17 KB
rio_mport_cdev.h	9.11 KB
rkisp1-config.h	30.63 KB
romfs_fs.h	1.21 KB
rose.h	2.18 KB
route.h	2.28 KB
rpl.h	814 B
rpl_iptunnel.h	424 B
rpmsg.h	1.03 KB
rpmsg_types.h	288 B
rseq.h	4.79 KB
rtc.h	5.19 KB
rtnetlink.h	20.8 KB
rxrpc.h	4.81 KB
scc.h	4.52 KB
sched	-
sched.h	6.12 KB
scif_ioctl.h	6.23 KB
screen_info.h	2.42 KB
sctp.h	35.18 KB
seccomp.h	5.6 KB
securebits.h	2.64 KB
sed-opal.h	5.29 KB
seg6.h	1.14 KB
seg6_genl.h	589 B
seg6_hmac.h	423 B
seg6_iptunnel.h	984 B
seg6_local.h	3.78 KB
selinux_netlink.h	1.17 KB
sem.h	2.98 KB
serial.h	4.9 KB
serial_core.h	4.93 KB
serial_reg.h	15.65 KB
serio.h	2.09 KB
sev-guest.h	2.47 KB
shm.h	3.71 KB
signal.h	388 B
signalfd.h	1.2 KB
smc.h	8.31 KB
smc_diag.h	2.77 KB
smiapp.h	1.03 KB
snmp.h	13.92 KB
sock_diag.h	1.27 KB
socket.h	919 B
sockios.h	6.69 KB
sonet.h	2.24 KB
sonypi.h	5.18 KB
sound.h	1.21 KB
soundcard.h	44.96 KB
spi	-
stat.h	7.23 KB
stddef.h	1.69 KB
stm.h	1.25 KB
string.h	238 B
sunrpc	-
surface_aggregator	-
suspend_ioctls.h	1.4 KB
swab.h	6.76 KB
switchtec_ioctl.h	5.14 KB
sync_file.h	3.49 KB
synclink.h	8.77 KB
sysctl.h	25.3 KB
sysinfo.h	1.02 KB
target_core_user.h	4.52 KB
taskstats.h	8.13 KB
tc_act	-
tc_ematch	-
tcp.h	11.65 KB
tcp_metrics.h	1.94 KB
tdx-guest.h	1.27 KB
tee.h	13.09 KB
termios.h	172 B
thermal.h	3.23 KB
time.h	1.71 KB
time_types.h	1.24 KB
timerfd.h	936 B
times.h	278 B
timex.h	7.63 KB
tiocl.h	1.69 KB
tipc.h	8.62 KB
tipc_config.h	14.52 KB
tipc_netlink.h	9.17 KB
tipc_sockets_diag.h	468 B
tls.h	7.06 KB
toshiba.h	1.88 KB
tps6594_pfsm.h	1.13 KB
tty.h	1.55 KB
tty_flags.h	4.4 KB
types.h	1.6 KB
udf_fs_i.h	697 B
udmabuf.h	643 B
udp.h	1.65 KB
uhid.h	4.54 KB
uinput.h	9.04 KB
uio.h	732 B
uleds.h	798 B
ultrasound.h	4.46 KB
um_timetravel.h	3.87 KB
un.h	384 B
unistd.h	220 B
unix_diag.h	1.3 KB
usb	-
usbdevice_fs.h	8.12 KB
usbip.h	1.47 KB
userfaultfd.h	10.68 KB
userio.h	1.48 KB
utime.h	223 B
utsname.h	669 B
uuid.h	28 B
uvcvideo.h	2.57 KB
v4l2-common.h	2.01 KB
v4l2-controls.h	94.59 KB
v4l2-dv-timings.h	30.39 KB
v4l2-mediabus.h	5.3 KB
v4l2-subdev.h	9.76 KB
vbox_err.h	7.09 KB
vbox_vmmdev_types.h	11.38 KB
vboxguest.h	9.15 KB
vdpa.h	1.74 KB
vduse.h	9.58 KB
version.h	374 B
veth.h	224 B
vfio.h	70.12 KB
vfio_ccw.h	1.29 KB
vfio_zdev.h	2.48 KB
vhost.h	8.24 KB
vhost_types.h	4.77 KB
videodev2.h	98.83 KB
virtio_9p.h	2 KB
virtio_balloon.h	5.16 KB
virtio_blk.h	9.75 KB
virtio_bt.h	910 B
virtio_config.h	4.36 KB
virtio_console.h	3.08 KB
virtio_crypto.h	13.56 KB
virtio_fs.h	573 B
virtio_gpio.h	1.7 KB
virtio_gpu.h	11.28 KB
virtio_i2c.h	1.16 KB
virtio_ids.h	3.7 KB
virtio_input.h	2.46 KB
virtio_iommu.h	3.84 KB
virtio_mem.h	6.99 KB
virtio_mmio.h	4.85 KB
virtio_net.h	14.72 KB
virtio_pci.h	7.3 KB
virtio_pcidev.h	2.33 KB
virtio_pmem.h	641 B
virtio_ring.h	8.52 KB
virtio_rng.h	265 B
virtio_scmi.h	637 B
virtio_scsi.h	5.94 KB
virtio_snd.h	12.86 KB
virtio_types.h	2.1 KB
virtio_vsock.h	3.27 KB
vm_sockets.h	7.18 KB
vm_sockets_diag.h	963 B
vmcore.h	455 B
vsockmon.h	1.84 KB
vt.h	2.99 KB
vtpm_proxy.h	1.68 KB
wait.h	682 B
watch_queue.h	3.41 KB
watchdog.h	2.28 KB
wireguard.h	7.57 KB
wireless.h	41.7 KB
wmi.h	1.72 KB
wwan.h	295 B
x25.h	3.48 KB
xattr.h	2.95 KB
xdp_diag.h	1.43 KB
xfrm.h	12.33 KB
xilinx-v4l2-controls.h	2.91 KB
zorro.h	3.22 KB
zorro_ids.h	29.26 KB

Edit: userfaultfd.h

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
 *  include/linux/userfaultfd.h
 *
 *  Copyright (C) 2007  Davide Libenzi <davidel@xmailserver.org>
 *  Copyright (C) 2015  Red Hat, Inc.
 *
 */

#ifndef _LINUX_USERFAULTFD_H
#define _LINUX_USERFAULTFD_H

#include <linux/types.h>

/* ioctls for /dev/userfaultfd */
#define USERFAULTFD_IOC 0xAA
#define USERFAULTFD_IOC_NEW _IO(USERFAULTFD_IOC, 0x00)

/*
 * If the UFFDIO_API is upgraded someday, the UFFDIO_UNREGISTER and
 * UFFDIO_WAKE ioctls should be defined as _IOW and not as _IOR.  In
 * userfaultfd.h we assumed the kernel was reading (instead _IOC_READ
 * means the userland is reading).
 */
#define UFFD_API ((__u64)0xAA)
#define UFFD_API_REGISTER_MODES (UFFDIO_REGISTER_MODE_MISSING |	\
				 UFFDIO_REGISTER_MODE_WP |	\
				 UFFDIO_REGISTER_MODE_MINOR)
#define UFFD_API_FEATURES (UFFD_FEATURE_PAGEFAULT_FLAG_WP |	\
			   UFFD_FEATURE_EVENT_FORK |		\
			   UFFD_FEATURE_EVENT_REMAP |		\
			   UFFD_FEATURE_EVENT_REMOVE |		\
			   UFFD_FEATURE_EVENT_UNMAP |		\
			   UFFD_FEATURE_MISSING_HUGETLBFS |	\
			   UFFD_FEATURE_MISSING_SHMEM |		\
			   UFFD_FEATURE_SIGBUS |		\
			   UFFD_FEATURE_THREAD_ID |		\
			   UFFD_FEATURE_MINOR_HUGETLBFS |	\
			   UFFD_FEATURE_MINOR_SHMEM |		\
			   UFFD_FEATURE_EXACT_ADDRESS |		\
			   UFFD_FEATURE_WP_HUGETLBFS_SHMEM |	\
			   UFFD_FEATURE_WP_UNPOPULATED |	\
			   UFFD_FEATURE_POISON)
#define UFFD_API_IOCTLS				\
	((__u64)1 << _UFFDIO_REGISTER |		\
	 (__u64)1 << _UFFDIO_UNREGISTER |	\
	 (__u64)1 << _UFFDIO_API)
#define UFFD_API_RANGE_IOCTLS			\
	((__u64)1 << _UFFDIO_WAKE |		\
	 (__u64)1 << _UFFDIO_COPY |		\
	 (__u64)1 << _UFFDIO_ZEROPAGE |		\
	 (__u64)1 << _UFFDIO_WRITEPROTECT |	\
	 (__u64)1 << _UFFDIO_CONTINUE |		\
	 (__u64)1 << _UFFDIO_POISON)
#define UFFD_API_RANGE_IOCTLS_BASIC		\
	((__u64)1 << _UFFDIO_WAKE |		\
	 (__u64)1 << _UFFDIO_COPY |		\
	 (__u64)1 << _UFFDIO_WRITEPROTECT |	\
	 (__u64)1 << _UFFDIO_CONTINUE |		\
	 (__u64)1 << _UFFDIO_POISON)

/*
 * Valid ioctl command number range with this API is from 0x00 to
 * 0x3F.  UFFDIO_API is the fixed number, everything else can be
 * changed by implementing a different UFFD_API. If sticking to the
 * same UFFD_API more ioctl can be added and userland will be aware of
 * which ioctl the running kernel implements through the ioctl command
 * bitmask written by the UFFDIO_API.
 */
#define _UFFDIO_REGISTER		(0x00)
#define _UFFDIO_UNREGISTER		(0x01)
#define _UFFDIO_WAKE			(0x02)
#define _UFFDIO_COPY			(0x03)
#define _UFFDIO_ZEROPAGE		(0x04)
#define _UFFDIO_WRITEPROTECT		(0x06)
#define _UFFDIO_CONTINUE		(0x07)
#define _UFFDIO_POISON			(0x08)
#define _UFFDIO_API			(0x3F)

/* userfaultfd ioctl ids */
#define UFFDIO 0xAA
#define UFFDIO_API		_IOWR(UFFDIO, _UFFDIO_API,	\
				      struct uffdio_api)
#define UFFDIO_REGISTER		_IOWR(UFFDIO, _UFFDIO_REGISTER, \
				      struct uffdio_register)
#define UFFDIO_UNREGISTER	_IOR(UFFDIO, _UFFDIO_UNREGISTER,	\
				     struct uffdio_range)
#define UFFDIO_WAKE		_IOR(UFFDIO, _UFFDIO_WAKE,	\
				     struct uffdio_range)
#define UFFDIO_COPY		_IOWR(UFFDIO, _UFFDIO_COPY,	\
				      struct uffdio_copy)
#define UFFDIO_ZEROPAGE		_IOWR(UFFDIO, _UFFDIO_ZEROPAGE,	\
				      struct uffdio_zeropage)
#define UFFDIO_WRITEPROTECT	_IOWR(UFFDIO, _UFFDIO_WRITEPROTECT, \
				      struct uffdio_writeprotect)
#define UFFDIO_CONTINUE		_IOWR(UFFDIO, _UFFDIO_CONTINUE,	\
				      struct uffdio_continue)
#define UFFDIO_POISON		_IOWR(UFFDIO, _UFFDIO_POISON, \
				      struct uffdio_poison)

/* read() structure */
struct uffd_msg {
	__u8	event;

__u8	reserved1;
	__u16	reserved2;
	__u32	reserved3;

union {
		struct {
			__u64	flags;
			__u64	address;
			union {
				__u32 ptid;
			} feat;
		} pagefault;

struct {
			__u32	ufd;
		} fork;

struct {
			__u64	from;
			__u64	to;
			__u64	len;
		} remap;

struct {
			__u64	start;
			__u64	end;
		} remove;

struct {
			/* unused reserved fields */
			__u64	reserved1;
			__u64	reserved2;
			__u64	reserved3;
		} reserved;
	} arg;
} __attribute__((packed));

/*
 * Start at 0x12 and not at 0 to be more strict against bugs.
 */
#define UFFD_EVENT_PAGEFAULT	0x12
#define UFFD_EVENT_FORK		0x13
#define UFFD_EVENT_REMAP	0x14
#define UFFD_EVENT_REMOVE	0x15
#define UFFD_EVENT_UNMAP	0x16

/* flags for UFFD_EVENT_PAGEFAULT */
#define UFFD_PAGEFAULT_FLAG_WRITE	(1<<0)	/* If this was a write fault */
#define UFFD_PAGEFAULT_FLAG_WP		(1<<1)	/* If reason is VM_UFFD_WP */
#define UFFD_PAGEFAULT_FLAG_MINOR	(1<<2)	/* If reason is VM_UFFD_MINOR */

struct uffdio_api {
	/* userland asks for an API number and the features to enable */
	__u64 api;
	/*
	 * Kernel answers below with the all available features for
	 * the API, this notifies userland of which events and/or
	 * which flags for each event are enabled in the current
	 * kernel.
	 *
	 * Note: UFFD_EVENT_PAGEFAULT and UFFD_PAGEFAULT_FLAG_WRITE
	 * are to be considered implicitly always enabled in all kernels as
	 * long as the uffdio_api.api requested matches UFFD_API.
	 *
	 * UFFD_FEATURE_MISSING_HUGETLBFS means an UFFDIO_REGISTER
	 * with UFFDIO_REGISTER_MODE_MISSING mode will succeed on
	 * hugetlbfs virtual memory ranges. Adding or not adding
	 * UFFD_FEATURE_MISSING_HUGETLBFS to uffdio_api.features has
	 * no real functional effect after UFFDIO_API returns, but
	 * it's only useful for an initial feature set probe at
	 * UFFDIO_API time. There are two ways to use it:
	 *
	 * 1) by adding UFFD_FEATURE_MISSING_HUGETLBFS to the
	 *    uffdio_api.features before calling UFFDIO_API, an error
	 *    will be returned by UFFDIO_API on a kernel without
	 *    hugetlbfs missing support
	 *
	 * 2) the UFFD_FEATURE_MISSING_HUGETLBFS can not be added in
	 *    uffdio_api.features and instead it will be set by the
	 *    kernel in the uffdio_api.features if the kernel supports
	 *    it, so userland can later check if the feature flag is
	 *    present in uffdio_api.features after UFFDIO_API
	 *    succeeded.
	 *
	 * UFFD_FEATURE_MISSING_SHMEM works the same as
	 * UFFD_FEATURE_MISSING_HUGETLBFS, but it applies to shmem
	 * (i.e. tmpfs and other shmem based APIs).
	 *
	 * UFFD_FEATURE_SIGBUS feature means no page-fault
	 * (UFFD_EVENT_PAGEFAULT) event will be delivered, instead
	 * a SIGBUS signal will be sent to the faulting process.
	 *
	 * UFFD_FEATURE_THREAD_ID pid of the page faulted task_struct will
	 * be returned, if feature is not requested 0 will be returned.
	 *
	 * UFFD_FEATURE_MINOR_HUGETLBFS indicates that minor faults
	 * can be intercepted (via REGISTER_MODE_MINOR) for
	 * hugetlbfs-backed pages.
	 *
	 * UFFD_FEATURE_MINOR_SHMEM indicates the same support as
	 * UFFD_FEATURE_MINOR_HUGETLBFS, but for shmem-backed pages instead.
	 *
	 * UFFD_FEATURE_EXACT_ADDRESS indicates that the exact address of page
	 * faults would be provided and the offset within the page would not be
	 * masked.
	 *
	 * UFFD_FEATURE_WP_HUGETLBFS_SHMEM indicates that userfaultfd
	 * write-protection mode is supported on both shmem and hugetlbfs.
	 *
	 * UFFD_FEATURE_WP_UNPOPULATED indicates that userfaultfd
	 * write-protection mode will always apply to unpopulated pages
	 * (i.e. empty ptes).  This will be the default behavior for shmem
	 * & hugetlbfs, so this flag only affects anonymous memory behavior
	 * when userfault write-protection mode is registered.
	 */
#define UFFD_FEATURE_PAGEFAULT_FLAG_WP		(1<<0)
#define UFFD_FEATURE_EVENT_FORK			(1<<1)
#define UFFD_FEATURE_EVENT_REMAP		(1<<2)
#define UFFD_FEATURE_EVENT_REMOVE		(1<<3)
#define UFFD_FEATURE_MISSING_HUGETLBFS		(1<<4)
#define UFFD_FEATURE_MISSING_SHMEM		(1<<5)
#define UFFD_FEATURE_EVENT_UNMAP		(1<<6)
#define UFFD_FEATURE_SIGBUS			(1<<7)
#define UFFD_FEATURE_THREAD_ID			(1<<8)
#define UFFD_FEATURE_MINOR_HUGETLBFS		(1<<9)
#define UFFD_FEATURE_MINOR_SHMEM		(1<<10)
#define UFFD_FEATURE_EXACT_ADDRESS		(1<<11)
#define UFFD_FEATURE_WP_HUGETLBFS_SHMEM		(1<<12)
#define UFFD_FEATURE_WP_UNPOPULATED		(1<<13)
#define UFFD_FEATURE_POISON			(1<<14)
	__u64 features;

__u64 ioctls;
};

struct uffdio_range {
	__u64 start;
	__u64 len;
};

struct uffdio_register {
	struct uffdio_range range;
#define UFFDIO_REGISTER_MODE_MISSING	((__u64)1<<0)
#define UFFDIO_REGISTER_MODE_WP		((__u64)1<<1)
#define UFFDIO_REGISTER_MODE_MINOR	((__u64)1<<2)
	__u64 mode;

/*
	 * kernel answers which ioctl commands are available for the
	 * range, keep at the end as the last 8 bytes aren't read.
	 */
	__u64 ioctls;
};

struct uffdio_copy {
	__u64 dst;
	__u64 src;
	__u64 len;
#define UFFDIO_COPY_MODE_DONTWAKE		((__u64)1<<0)
	/*
	 * UFFDIO_COPY_MODE_WP will map the page write protected on
	 * the fly.  UFFDIO_COPY_MODE_WP is available only if the
	 * write protected ioctl is implemented for the range
	 * according to the uffdio_register.ioctls.
	 */
#define UFFDIO_COPY_MODE_WP			((__u64)1<<1)
	__u64 mode;

/*
	 * "copy" is written by the ioctl and must be at the end: the
	 * copy_from_user will not read the last 8 bytes.
	 */
	__s64 copy;
};

struct uffdio_zeropage {
	struct uffdio_range range;
#define UFFDIO_ZEROPAGE_MODE_DONTWAKE		((__u64)1<<0)
	__u64 mode;

/*
	 * "zeropage" is written by the ioctl and must be at the end:
	 * the copy_from_user will not read the last 8 bytes.
	 */
	__s64 zeropage;
};

struct uffdio_writeprotect {
	struct uffdio_range range;
/*
 * UFFDIO_WRITEPROTECT_MODE_WP: set the flag to write protect a range,
 * unset the flag to undo protection of a range which was previously
 * write protected.
 *
 * UFFDIO_WRITEPROTECT_MODE_DONTWAKE: set the flag to avoid waking up
 * any wait thread after the operation succeeds.
 *
 * NOTE: Write protecting a region (WP=1) is unrelated to page faults,
 * therefore DONTWAKE flag is meaningless with WP=1.  Removing write
 * protection (WP=0) in response to a page fault wakes the faulting
 * task unless DONTWAKE is set.
 */
#define UFFDIO_WRITEPROTECT_MODE_WP		((__u64)1<<0)
#define UFFDIO_WRITEPROTECT_MODE_DONTWAKE	((__u64)1<<1)
	__u64 mode;
};

struct uffdio_continue {
	struct uffdio_range range;
#define UFFDIO_CONTINUE_MODE_DONTWAKE		((__u64)1<<0)
	/*
	 * UFFDIO_CONTINUE_MODE_WP will map the page write protected on
	 * the fly.  UFFDIO_CONTINUE_MODE_WP is available only if the
	 * write protected ioctl is implemented for the range
	 * according to the uffdio_register.ioctls.
	 */
#define UFFDIO_CONTINUE_MODE_WP			((__u64)1<<1)
	__u64 mode;

/*
	 * Fields below here are written by the ioctl and must be at the end:
	 * the copy_from_user will not read past here.
	 */
	__s64 mapped;
};

struct uffdio_poison {
	struct uffdio_range range;
#define UFFDIO_POISON_MODE_DONTWAKE		((__u64)1<<0)
	__u64 mode;

/*
	 * Fields below here are written by the ioctl and must be at the end:
	 * the copy_from_user will not read past here.
	 */
	__s64 updated;
};

/*
 * Flags for the userfaultfd(2) system call itself.
 */

/*
 * Create a userfaultfd that can handle page faults only in user mode.
 */
#define UFFD_USER_MODE_ONLY 1

#endif /* _LINUX_USERFAULTFD_H */