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serenity/Libraries/LibC
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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
..
arpa LibC: Fix a warning when building LibC with -O2 2020-10-20 18:10:22 +02:00
bits LibC: Add POSIX1 minimum limits to limits.h 2020-11-10 14:39:38 +01:00
net Meta: Add a script check the presence of "#pragma once" in header files 2020-05-29 07:59:45 +02:00
netinet LibC: Add some missing netinet macros required by OpenSSH 2020-09-27 01:02:11 +02:00
sys Kernel+LibC: Add adjtime(2) 2020-11-10 19:03:08 +01:00
alloca.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
assert.cpp LibC: Remove endless loop after abort() call 2020-05-26 14:35:10 +02:00
assert.h LibC: Make sure assert() expands to *something* in non-DEBUG builds 2020-08-11 20:29:14 +02:00
byteswap.h Meta: Add missing copyright headers 2020-04-06 11:09:01 +02:00
CMakeLists.txt CMake: Use CONFIGURE_DEPENDS in existing globs. 2020-10-29 11:52:47 +01:00
crt0.cpp LibC: Avoid ninja-imports of system functions 2020-08-12 20:40:59 +02:00
crti.S Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
crtn.S Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
ctype.cpp LibC: Remove an unneeded string.h include in ctype.h/cpp 2020-09-27 21:15:25 +02:00
ctype.h LibC: Remove an unneeded string.h include in ctype.h/cpp 2020-09-27 21:15:25 +02:00
cxxabi.cpp LibC: Move C++ABI functions to cxxabi.cpp, typecheck cxa_atexit 2020-08-12 20:40:59 +02:00
dirent.cpp Kernel: Move headers intended for userspace use into Kernel/API/ 2020-07-04 17:22:23 +02:00
dirent.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
dlfcn.cpp Meta+LibC through LibHTTP: Make clang-format-10 clean 2020-09-25 21:18:17 +02:00
dlfcn.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
endian.h LibC: Fix big endian definitions 2020-02-19 16:08:28 +01:00
errno.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
errno_numbers.h Kernel+LibC: Don't allow a directory to become a subdirectory of itself 2020-11-01 19:21:19 +01:00
fcntl.cpp LibC: Missing varargs cleanup in fcntl 2020-08-17 09:17:57 +02:00
fcntl.h Kernel+LibC: Switch isatty() to use a fcntl() 2020-05-20 08:31:31 +02:00
fd_set.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
float.h Meta: Add a script check the presence of "#pragma once" in header files 2020-05-29 07:59:45 +02:00
getopt.cpp LibC: Don't include things required for getopt_long in unistd.h 2020-09-06 21:36:36 +02:00
getopt.h LibC: Include cdefs.h in getopt.h 2020-09-27 01:02:11 +02:00
grp.cpp LibC: Use AK::String-backed buffers instead of static buffers 2020-08-30 17:35:27 +02:00
grp.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
iconv.h Meta+LibC through LibHTTP: Make clang-format-10 clean 2020-09-25 21:18:17 +02:00
inttypes.h LibC: Add some missing macros to inttypes.h 2020-02-20 06:51:16 +01:00
ioctl.cpp LibC: Missing varargs cleanup in ioctl 2020-08-17 09:17:57 +02:00
libcinit.cpp LibC: Move C++ABI functions to cxxabi.cpp, typecheck cxa_atexit 2020-08-12 20:40:59 +02:00
libgen.cpp Meta: Claim copyright for files created by me 2020-01-24 15:15:16 +01:00
libgen.h Meta: Claim copyright for files created by me 2020-01-24 15:15:16 +01:00
limits.h LibC: Add POSIX1 minimum limits to limits.h 2020-11-10 14:39:38 +01:00
locale.cpp LibC: Use dbgln() in setlocale() 2020-10-30 17:03:28 +01:00
locale.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
malloc.cpp UserspaceEmulator+LibC: Have UE notice realloc() and update accounting 2020-11-08 10:43:15 +01:00
mallocdefs.h Meta+LibC through LibHTTP: Make clang-format-10 clean 2020-09-25 21:18:17 +02:00
memory.h Meta: Add a script check the presence of "#pragma once" in header files 2020-05-29 07:59:45 +02:00
mman.cpp Kernel+LibC: Use uintptr_t as the main type in the syscall interface 2020-10-12 19:53:25 +02:00
mman.h Kernel+LibC: Add minherit() and MAP_INHERIT_ZERO 2020-04-12 20:22:26 +02:00
mntent.cpp Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
mntent.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
netdb.cpp Everywhere: Fix typos 2020-10-02 16:03:17 +02:00
netdb.h LibC: getprotoent() family of functions 2020-04-18 10:11:55 +02:00
paths.h LibC: Add paths.h with some default mail directory for now 2020-09-27 01:02:11 +02:00
poll.cpp Kernel: Move headers intended for userspace use into Kernel/API/ 2020-07-04 17:22:23 +02:00
poll.h LibC+Kernel: Implement ppoll 2020-06-23 14:12:20 +02:00
pwd.cpp LibC: Use AK::String-backed buffers instead of static buffers 2020-08-30 17:35:27 +02:00
pwd.h LibC: Implement putpwent() 2020-02-02 10:58:45 +01:00
qsort.cpp LibC: Remove unused data member in the qsort() implementation 2020-08-24 18:22:09 +02:00
scanf.cpp LibC: Add FIXME for vsscanf 2020-09-27 01:02:11 +02:00
sched.cpp Kernel: Move headers intended for userspace use into Kernel/API/ 2020-07-04 17:22:23 +02:00
sched.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
serenity.cpp Kernel+LibC: Use uintptr_t as the main type in the syscall interface 2020-10-12 19:53:25 +02:00
serenity.h Kernel+LibC: Use uintptr_t as the main type in the syscall interface 2020-10-12 19:53:25 +02:00
setjmp.h Meta+LibC through LibHTTP: Make clang-format-10 clean 2020-09-25 21:18:17 +02:00
setjmp.S Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
signal.cpp Userland+LibC: Add "kill -l" to show all known signal names/numbers 2020-10-29 23:32:18 +01:00
signal.h Userland+LibC: Add "kill -l" to show all known signal names/numbers 2020-10-29 23:32:18 +01:00
signal_numbers.h Kernel+LibC+UE: Introduce SIGINFO (generated with ^T) 2020-09-09 21:10:23 +02:00
spawn.cpp Meta+LibC through LibHTTP: Make clang-format-10 clean 2020-09-25 21:18:17 +02:00
spawn.h Add manpages for posix_spawn 2020-07-06 10:01:14 +02:00
stat.cpp LibC: Move stat(), lstat() and fstat() to <sys/stat.h> 2020-08-11 20:29:14 +02:00
stdarg.h Kernel: Absorb LibBareMetal back into the kernel 2020-05-16 12:00:04 +02:00
stdbool.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
stddef.h Meta+LibC through LibHTTP: Make clang-format-10 clean 2020-09-25 21:18:17 +02:00
stdint.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
stdio.cpp AK: Make the return type of dbgputstr consistent. 2020-10-04 19:18:32 +02:00
stdio.h AK: Make the return type of dbgputstr consistent. 2020-10-04 19:18:32 +02:00
stdlib.cpp Style: Remove uses of NULL, substituting nullptr 2020-10-13 13:52:52 +02:00
stdlib.h LibC: Made mbtowc return int instead of size_t 2020-09-27 01:02:11 +02:00
string.cpp Kernel+LibC: Don't allow a directory to become a subdirectory of itself 2020-11-01 19:21:19 +01:00
string.h LibC: Don't advertise wrong functions 2020-09-12 13:46:15 +02:00
strings.cpp Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
strings.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
syslog.cpp AK: Add a forward declaration header 2020-02-14 23:31:18 +01:00
syslog.h LibC: We still need to use NULL (not nullptr) in C headers 2020-10-14 13:57:51 +02:00
termcap.cpp LibC: Deprecate strcpy(), strncpy(), strcat() and strncat() :^) 2020-08-30 17:35:27 +02:00
termcap.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
termios.cpp LibC: Implement tcflush(3) 2020-07-11 11:33:33 +02:00
termios.h LibC: Implement cf{g,s}et{i,o}speed 2020-07-04 10:49:36 +02:00
time.cpp Kernel+LibC: Add adjtime(2) 2020-11-10 19:03:08 +01:00
time.h LibC: Make difftime a function 2020-10-15 13:45:00 +02:00
times.cpp Kernel: Move headers intended for userspace use into Kernel/API/ 2020-07-04 17:22:23 +02:00
ulimit.cpp LibC: Log calls to getrusage 2020-05-07 23:32:11 +02:00
ulimit.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
unistd.cpp Kernel: Make copy_to/from_user safe and remove unnecessary checks 2020-09-13 21:19:15 +02:00
unistd.h Kernel: Implement _SC_OPEN_MAX 2020-09-27 01:02:11 +02:00
utime.cpp Kernel: Move headers intended for userspace use into Kernel/API/ 2020-07-04 17:22:23 +02:00
utime.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
utmp.h LibC: Add missing utmp backwards compatibility hacks and user/dead process macros 2020-09-27 01:02:11 +02:00
utsname.cpp Kernel: Move headers intended for userspace use into Kernel/API/ 2020-07-04 17:22:23 +02:00
wchar.cpp Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
wchar.h Meta: Add license header to source files 2020-01-18 09:45:54 +01:00