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serenity/Kernel/Syscalls
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Nico Weber 323e727a4c Kernel+LibC: Add adjtime(2) 
Most systems (Linux, OpenBSD) adjust 0.5 ms per second, or 0.5 us per
1 ms tick. That is, the clock is sped up or slowed down by at most
0.05%.  This means adjusting the clock by 1 s takes 2000 s, and the
clock an be adjusted by at most 1.8 s per hour.

FreeBSD adjusts 5 ms per second if the remaining time adjustment is
>= 1 s (0.5%) , else it adjusts by 0.5 ms as well. This allows adjusting
by (almost) 18 s per hour.

Since Serenity OS can lose more than 22 s per hour (#3429), this
picks an adjustment rate up to 1% for now. This allows us to
adjust up to 36s per hour, which should be sufficient to adjust
the clock fast enough to keep up with how much time the clock
currently loses. Once we have a fancier NTP implementation that can
adjust tick rate in addition to offset, we can think about reducing
this.

adjtime is a bit old-school and most current POSIX-y OSs instead
implement adjtimex/ntp_adjtime, but a) we have to start somewhere
b) ntp_adjtime() is a fairly gnarly API. OpenBSD's adjfreq looks
like it might provide similar functionality with a nicer API. But
before worrying about all this, it's probably a good idea to get
to a place where the kernel APIs are (barely) good enough so that
we can write an ntp service, and once we have that we should write
a way to automatically evaluate how well it keeps the time adjusted,
and only then should we add improvements ot the adjustment mechanism.
2020-11-10 19:03:08 +01:00
..
access.cpp Kernel: Convert some more syscalls to Userspace<T> 2020-08-02 11:01:00 +02:00
alarm.cpp Kernel: Move syscall implementations out of Process.cpp 2020-07-30 23:40:57 +02:00
beep.cpp Kernel: Move syscall implementations out of Process.cpp 2020-07-30 23:40:57 +02:00
chdir.cpp Kernel: Make copy_to/from_user safe and remove unnecessary checks 2020-09-13 21:19:15 +02:00
chmod.cpp Kernel: Use Userspace<T> for the chmod syscall 2020-08-10 12:52:15 +02:00
chown.cpp Kernel: Make copy_to/from_user safe and remove unnecessary checks 2020-09-13 21:19:15 +02:00
chroot.cpp Kernel: Use Userspace<T> for the chroot syscall 2020-08-10 12:52:15 +02:00
clock.cpp Kernel+LibC: Add adjtime(2) 2020-11-10 19:03:08 +01:00
debug.cpp Kernel: Make copy_to/from_user safe and remove unnecessary checks 2020-09-13 21:19:15 +02:00
disown.cpp Kernel: PID/TID typing 2020-08-10 11:51:45 +02:00
dup2.cpp Kernel+LibC+UserspaceEmulator: Bring back sys$dup2() 2020-08-15 11:11:34 +02:00
execve.cpp Kernel: Fix a few deadlocks with Thread::m_lock and g_scheduler_lock 2020-10-26 08:57:25 +01:00
exit.cpp Kernel: Move syscall implementations out of Process.cpp 2020-07-30 23:40:57 +02:00
fcntl.cpp Kernel: Turn Process::FileDescriptionAndFlags into a proper class 2020-07-30 23:50:31 +02:00
fork.cpp Kernel: Fix a few deadlocks with Thread::m_lock and g_scheduler_lock 2020-10-26 08:57:25 +01:00
ftruncate.cpp Kernel: Move syscall implementations out of Process.cpp 2020-07-30 23:40:57 +02:00
futex.cpp Kernel: Make copy_to/from_user safe and remove unnecessary checks 2020-09-13 21:19:15 +02:00
get_dir_entries.cpp Kernel: Make copy_to/from_user safe and remove unnecessary checks 2020-09-13 21:19:15 +02:00
get_stack_bounds.cpp Kernel: Make copy_to/from_user safe and remove unnecessary checks 2020-09-13 21:19:15 +02:00
getrandom.cpp Meta+Kernel: Make clang-format-10 clean 2020-09-25 21:18:17 +02:00
getuid.cpp Kernel: Make copy_to/from_user safe and remove unnecessary checks 2020-09-13 21:19:15 +02:00
hostname.cpp Kernel: Make copy_to/from_user safe and remove unnecessary checks 2020-09-13 21:19:15 +02:00
ioctl.cpp Kernel: Remove SmapDisabler in sys$ioctl() 2020-07-31 00:17:25 +02:00
kill.cpp Kernel: Rename Process::is_ring0/3 to Process::is_kernel/user_process 2020-09-10 19:57:15 +02:00
link.cpp Kernel: Make copy_to/from_user safe and remove unnecessary checks 2020-09-13 21:19:15 +02:00
lseek.cpp Kernel: Move syscall implementations out of Process.cpp 2020-07-30 23:40:57 +02:00
mkdir.cpp Kernel: Convert some more syscalls to Userspace<T> 2020-08-02 11:01:00 +02:00
mknod.cpp Kernel: Make copy_to/from_user safe and remove unnecessary checks 2020-09-13 21:19:15 +02:00
mmap.cpp Kernel: Make copy_to/from_user safe and remove unnecessary checks 2020-09-13 21:19:15 +02:00
module.cpp Kernel: Make copy_to/from_user safe and remove unnecessary checks 2020-09-13 21:19:15 +02:00
mount.cpp Kernel: Make copy_to/from_user safe and remove unnecessary checks 2020-09-13 21:19:15 +02:00
open.cpp Kernel: Make copy_to/from_user safe and remove unnecessary checks 2020-09-13 21:19:15 +02:00
perf_event.cpp Kernel: Move syscall implementations out of Process.cpp 2020-07-30 23:40:57 +02:00
pipe.cpp Kernel: Make copy_to/from_user safe and remove unnecessary checks 2020-09-13 21:19:15 +02:00
pledge.cpp Kernel: Unbreak sys$pledge() 2020-09-17 15:07:20 +02:00
process.cpp Kernel: Make copy_to/from_user safe and remove unnecessary checks 2020-09-13 21:19:15 +02:00
profiling.cpp Kernel: Remove ProcessInspectionHandle and make Process RefCounted 2020-08-02 17:15:11 +02:00
ptrace.cpp Meta+Kernel: Make clang-format-10 clean 2020-09-25 21:18:17 +02:00
purge.cpp Kernel: Move syscall implementations out of Process.cpp 2020-07-30 23:40:57 +02:00
read.cpp Kernel: Make copy_to/from_user safe and remove unnecessary checks 2020-09-13 21:19:15 +02:00
readlink.cpp Kernel: Make copy_to/from_user safe and remove unnecessary checks 2020-09-13 21:19:15 +02:00
realpath.cpp Kernel: Make copy_to/from_user safe and remove unnecessary checks 2020-09-13 21:19:15 +02:00
rename.cpp Kernel: Make copy_to/from_user safe and remove unnecessary checks 2020-09-13 21:19:15 +02:00
rmdir.cpp Kernel: Convert some more syscalls to Userspace<T> 2020-08-02 11:01:00 +02:00
sched.cpp Kernel: Make Thread refcounted 2020-09-27 19:46:04 +02:00
select.cpp Meta+Kernel: Make clang-format-10 clean 2020-09-25 21:18:17 +02:00
sendfd.cpp Kernel: Move syscall implementations out of Process.cpp 2020-07-30 23:40:57 +02:00
setkeymap.cpp Kernel: Make copy_to/from_user safe and remove unnecessary checks 2020-09-13 21:19:15 +02:00
setpgid.cpp Kernel: Distinguish between new and old process groups with equal pgids 2020-08-19 21:21:34 +02:00
setuid.cpp Kernel: Make copy_to/from_user safe and remove unnecessary checks 2020-09-13 21:19:15 +02:00
shbuf.cpp Kernel: Make copy_to/from_user safe and remove unnecessary checks 2020-09-13 21:19:15 +02:00
shutdown.cpp Kernel: Add shutdown commands for other virtualizers 2020-08-30 10:31:39 +02:00
sigaction.cpp Kernel: Make copy_to/from_user safe and remove unnecessary checks 2020-09-13 21:19:15 +02:00
socket.cpp Kernel+LibC+UserspaceEmulator: Add SO_TIMESTAMP, and cmsg definitions 2020-09-17 17:23:01 +02:00
stat.cpp Kernel: Make copy_to/from_user safe and remove unnecessary checks 2020-09-13 21:19:15 +02:00
sync.cpp Kernel: Move syscall implementations out of Process.cpp 2020-07-30 23:40:57 +02:00
sysconf.cpp Kernel: Implement _SC_OPEN_MAX 2020-09-27 01:02:11 +02:00
thread.cpp Kernel: Fix a few deadlocks with Thread::m_lock and g_scheduler_lock 2020-10-26 08:57:25 +01:00
times.cpp Kernel: Make copy_to/from_user safe and remove unnecessary checks 2020-09-13 21:19:15 +02:00
ttyname.cpp Kernel: Make copy_to/from_user safe and remove unnecessary checks 2020-09-13 21:19:15 +02:00
umask.cpp Kernel: Move syscall implementations out of Process.cpp 2020-07-30 23:40:57 +02:00
uname.cpp Kernel: Make copy_to/from_user safe and remove unnecessary checks 2020-09-13 21:19:15 +02:00
unlink.cpp Kernel: Make copy_to/from_user safe and remove unnecessary checks 2020-09-13 21:19:15 +02:00
unveil.cpp Kernel: Prevent unveil returning ENOENT with cpath permissions 2020-11-10 09:53:18 +01:00
utime.cpp Kernel: Make copy_to/from_user safe and remove unnecessary checks 2020-09-13 21:19:15 +02:00
waitid.cpp Kernel: Make Thread refcounted 2020-09-27 19:46:04 +02:00
watch_file.cpp Kernel: Use Userspace<T> in more syscalls 2020-08-01 11:37:40 +02:00
write.cpp Kernel: Use Userspace<> for sys$writev 2020-09-15 20:20:38 +02:00