Beginnings of documentation, & some minor occasional cleanup

Basically, need to finish the User Libraries and User Space sections.

The entirety of kernel space should be documented now at least.

code/apps/sys-everest.lua

@@ -15,16 +15,13 @@
 --  though with automatically closing windows on process death.
 
 -- How Bristol talks to this is:
--- 1. Bristol starts up Everest. Everest does not claim new monitors by default.
--- 2. Bristol claims all available monitors to blank out the display
--- 3. The user logs in
--- 4. Bristol runs "startSession", enabling claiming of free monitors, and then promptly dies.
+-- 1. The user logs in
+-- 2. Bristol starts up Everest, and frees the primary monitor
+-- 3. The primary monitor is claimed by Everest and becomes monitor 1
+-- 4. After a small time, Bristol dies, unclaiming all monitors
 -- 5. Everest claims the new monitors, and the desktop session begins
--- 6. Everest dies/respawns, or endSession is called - in both cases,
---    Everest is now essentially back at the state in 1.
--- 7. Either this is Bristol, so go to 2,
---     or this is a screensaver host, and has a saving-throw to start Bristol if it dies unexpectedly.
---    In any case, this eventually returns to 2 or 4.
+-- 6. Everest shuts down for some reason,
+--     sys-init gets started UNLESS endSession(false) was used
 
 local everestProvider = neo.requireAccess("r.neo.pub.window", "registering npw")
 local everestSessionProvider = neo.requireAccess("r.neo.sys.session", "registering nsse")
@@ -46,7 +43,7 @@ neo.requestAccess("s.h.key_down")
 local monitors = {}
 
 -- NULL VIRTUAL MONITOR!
--- This is where we stuff processes while Bristol isn't online
+-- This is where we stuff processes until monitors show up
 monitors[0] = {nil, nil, 160, 50}
 
 -- {monitor, x, y, w, h, callback}

code/apps/sys-glacier.lua

@@ -14,7 +14,6 @@ local gpus = neo.requireAccess("c.gpu", "screen control")
 local screens = neo.requireAccess("c.screen", "screen control")
 neo.requireAccess("s.h.component_added", "HW management")
 neo.requireAccess("s.h.component_removed", "HW management")
-neo.requireAccess("s.h.key_down", "Keymap guesswork")
 
 local function shutdownFin(reboot)
  -- any final actions donkonit needs to take here

code/data/app-claw/local.lua

@@ -1,7 +1,7 @@
 return {
  ["neo"] = {
   desc = "KittenOS NEO Kernel & Base Libs",
-  v = 1,
+  v = 2,
   deps = {
   },
   dirs = {
@@ -50,7 +50,7 @@ return {
  },
  ["neo-everest"] = {
   desc = "KittenOS NEO / Everest (windowing)",
-  v = 0,
+  v = 2,
   deps = {
    "neo"
   },

code/init.lua

@@ -263,7 +263,7 @@ wrapOs = wrapMeta({
   totalMemory = computer.totalMemory, freeMemory = computer.freeMemory,
   energy = computer.energy, maxEnergy = computer.maxEnergy,
   clock = os.clock, date = os.date, difftime = os.difftime,
-  time = os.time, uptime = computer.uptime
+  time = os.time, uptime = computer.uptime, address = computer.address
  })
 wrapDebug = wrapMeta(debug)
 
@@ -530,7 +530,7 @@ function start(pkg, ...)
  env.neo.requestAccessAsync = requestAccessAsync
  env.neo.requestAccess = function (perm, handler)
   requestAccessAsync(perm)
-  if not handler then handler = function() end end
+  handler = handler or function() end
   while true do
    local n = {coroutine.yield()}
    handler(table.unpack(n))

repository/data/app-claw/local.lua

@@ -17,5 +17,24 @@ return {
   files = {
    "apps/app-eeprog.lua"
   },
+ },
+ ["neo-docs"] = {
+  desc = "KittenOS NEO system documentation",
+  v = 2,
+  deps = {
+  },
+  dirs = {
+   "docs"
+  },
+  files = {
+   "docs/an-intro",
+   "docs/kn-intro",
+   "docs/kn-refer",
+   "docs/kn-sched",
+   "docs/kn-perms",
+   "docs/us-perms",
+   "docs/ul-neoux",
+   "docs/ul-broil",
+  },
  }
 }

repository/docs/an-intro

@@ -0,0 +1,245 @@
+Welcome to the documentation for your
+ KittenOS NEO system.
+
+These documents are written to a 37-
+ column standard, in order to match
+ the Neolithic text editor.
+
+If editing them, please set a right
+ margin of 37, or an equivalent,
+ in order to ensure that the
+ documents do not require horizontal
+ scroll in order to read.
+
+This documentation is aimed at those
+ who wish to develop things for the
+ KittenOS NEO system.
+
+Due to the size of the system, it is
+ divided into several sections,
+ each section being a file.
+
+This section will cover an overview
+ of the KittenOS NEO system.
+
+It is an abstract overview, but one
+ that will give you a framework in
+ which the components make sense,
+ should you simply skip to them.
+
+The KittenOS NEO system is divided
+ into three things - the kernel,
+ libraries, and the processes.
+
+The kernel is always loaded at all
+ times, and is the root of all system
+ activity.
+
+The libraries are essentially Lua
+ values that are kept in memory by a
+ weak-valued table.
+
+This allows them to be reused,
+ and memory saved, if possible,
+ while also allowing unloading.
+
+This is a critical memory management
+ technique in KittenOS NEO, as it
+ allows certain libraries to be
+ loaded only when in active use.
+
+(This also means libraries can have
+  security side-effects, but they
+  always can in any system, arguably,
+  and it's worth it for the memory.)
+
+The processes are applications and
+ services, that communicate with the
+ kernel via the NEO Kernel API, and
+ that communicate with others via
+ Lua values and tables shared between
+ the processes, that also constitute
+ a form of API.
+
+These APIs are shared and retrieved
+ via Accesses - anything that causes
+ a permissions check is an Access.
+
+Accesses are easy to replace in the
+ system, should you wish to heavily
+ customize the system in some way.
+
+The ability to receive given events,
+ is also an Access, though all "k."
+ events are always accessible for
+ simplicity reasons.
+
+"All components are replacable, as
+ long as you implement it correctly."
+
+Regarding the KittenOS NEO system
+ that you are now possibly running,
+ it likely has 3 critical services.
+
+I refer to these as the Trinity, just
+ because it seemed to fit.
+
+The following list notes which APIs
+ they provide and require, but only
+ from those in the "x." space.
+
+Anything else is an implementation
+ detail, subject to change - indeed,
+ these are only listed for the sake
+ of those who need to find code for
+ a given API.
+
+-------------------------------------
+
+Glacier: sys-glacier
+         * formerly sys-donkonit
+ Shell-independent parts of NEO, such
+  as screen management and settings,
+  and the "saving throw" recovery
+  mechanism.
+
+ Provides x.neo.sys.manage
+          x.neo.sys.screens
+          x.neo.pub.globals
+
+Everest: sys-everest
+ This is the default shell.
+
+ Provides x.neo.sys.session
+          x.neo.pub.window
+
+ Requires x.neo.sys.screens
+ Prefers  x.neo.sys.manage
+
+Icecap: sys-icecap
+ Shell-dependent component that
+  gains k.root and uses Everest
+  to implement the security policy.
+
+ Provides x.neo.pub.base
+ Requires x.neo.sys.manage
+ Prefers  x.neo.pub.window
+
+-------------------------------------
+
+The bootup process, meanwhile, is
+ rather simple.
+
+The kernel first designates the
+ primaryDisk based on the boot disk,
+ via the "deprecated" computer API
+ that has no replacement and is thus
+ nowhere near safe to remove.
+
+The primaryDisk is *the*
+ KittenOS NEO system disk - it holds
+ the system, in full.
+
+Inelegance here falls to the greater
+ power of practicality, as a VFS is
+ an unnecessary component here.
+
+After moving it's many globals into
+ place, it then immediately loads and
+ runs sys-init.
+
+sys-init's job is to firstly display
+ the KittenOS NEO boot screen -
+ this is where it got it's original
+ name from, s-bristol (see: Plymouth)
+
+It chooses the screen / GPU based on
+ the best combination it can find.
+
+The screen that it displays on is
+ then noted as the primary screen.
+
+During this boot screen, it firstly
+ starts Glacier, which is always a
+ necessary component for sys-init to
+ operate correctly.
+
+It then starts all services that have
+ "run." entries set to "yes".
+
+By default this means sys-icecap.
+
+Note that sys- entries occur first.
+
+This allows a security policy to be
+ installed, typically by sys-icecap,
+ that allows non-sys- parts to
+ perform useful operations.
+
+Finally, screen control is passed to
+ Glacier, and sys-init resets the
+ screens to their login-screen-state.
+
+If the settings daemon is not around
+ by this point, sys-init fails-safe
+ and allows login & safe-mode.
+
+(If you happen to be able to cause a
+ sys-glacier error, during early boot
+ in a way that does not require any
+ permissions with other ways of
+ creating havoc, then, this may be a
+ flaw in the system security model.
+ The risk is considered worth the
+  ability to theoretically use the
+  system.)
+
+If the setting "sys-init.nologin" is
+ set to "yes", then the login screen
+ is skipped.
+
+If the password is not empty, then
+ a password prompt is used.
+
+If Lua 5.2 is in use, the usual set
+ of instructions are replaced with a
+ warning to use Lua 5.3.
+
+After the login screen finishes,
+ sys-init disclaims the primary
+ screen, and runs the shell, dictated
+ by the setting "sys-init.shell" -
+ if settings are not available, then
+ sys-everest is used as a guess.
+
+Up to 5 seconds later, sys-init
+ confirms that "x.neo.sys.session" is
+ an existing API, and thus a shell is
+ currently running.
+
+If this does not occur in time,
+ then sys-init provides the:
+"That wasn't a shell. Try Safe Mode."
+ message, and causes a reboot.
+
+If it does, then sys-init finally
+ exits, with the "Trinity" in place,
+ and all screens automatically
+ disclaimed by sys-init's quit.
+
+(NOTE: If your particularly beady
+ service happens to get ahold of a
+ screen during startup, then that
+ screen is of course unaffected,
+ unless your service dies. This is of
+ course intentional in case you want
+ a service to control a screen.)
+
+This should summarize the system.
+Good luck. - 20kdc
+
+All of the KittenOS NEO documentation
+ is released into the public domain.
+
+No warranty is provided, implied,
+ or otherwise.

repository/docs/kn-intro

@@ -0,0 +1,92 @@
+The KittenOS NEO Kernel,
+ aka "init.lua", or as I like to call
+ it, "KNOSKRNL", is what happens when
+ someone tries to write a microkernel
+ in Lua, and make it efficient.
+
+Obviously, the result is not entirely
+ what would be expected from a kernel
+ at all, nevermind a microkernel.
+
+In particular, it borrows an
+ important concept, specifically fast
+ yet secure IPC.
+
+By which I of course mean that the
+ IPC consists of programs giving Lua
+ values to each other directly, and
+ the kernel giving the programs some
+ mechanisms to help secure this.
+
+Not what you expected, I assume.
+
+The "kn-" group of documents is about
+ the KittenOS NEO kernel.
+
+This is specifically ONLY about the
+ kernel, and only about features the
+ kernel provides directly.
+
+As the kernel provides many things to
+ everything under it, I believe this
+ is of great use.
+
+It's now time for the notes about the
+ kernel side of the boot process.
+
+Firstly, the startup of sys-init is
+ unlike any other - specifically, it
+ has a nil callerPid/callerPkg pair.
+
+This is because no application ran a
+ function to create the process - it
+ was created by the kernel.
+
+Secondly, here's what goes on in the
+ kernel when an Access is registered,
+ and when it's accessed:
+
+1. The service requests access with
+    an AID starting with "r.".
+2. The security policy presumably
+    accepts the registration.
+3. A blank registration in the table
+    "accesses" is made immediately.
+   This registration always fails to
+    be retrieved, but exists.
+4. A function is returned to reset
+    the registration.
+5. The service calls the function,
+    thus the registration is now
+    completed.
+
+6. The user-process requests access
+    with an AID starting with "x.",
+    everything after matching that
+    in the "r." registration.
+7. The security policy presumably
+    accepts the use of that API.
+8. The callback in the registration
+    is called.
+   It's first return value is sent
+    back to the user-process.
+   If it errors, then nil is given
+    instead (the error is not sent).
+
+Thirdly, the security policy is set
+ by getting the kernel global table
+ with "k.root", and then changing the
+ global "securityPolicy".
+
+Given this operation is only ever
+ performed once in typical use, and
+ having control over it is equivalent
+ to instant root, it seems fitting
+ that it is done this way.
+
+(Making absolute power absolute is
+ also why the kernel loves globals.)
+
+Finally, the kernel prevents those
+ processes that aren't "sys-" from
+ calling "sys-" processes.

repository/docs/kn-perms

@@ -0,0 +1,76 @@
+This is the list of Accesses natively
+ supported by the KittenOS NEO
+ kernel. It does not include those
+ that are handled by services,
+ but does include the mechanism for
+ creating & using services.
+
+For the services, see us-perms.
+
+Here, "*" means that everything after
+ this point is considered an argument
+ to the access.
+
+"c.*": Component. Returns:
+ list: Returns iterator over proxies.
+       These proxies may be set up to
+        be unalterable for obvious
+        security reasons.
+ For "filesystem", additionally:
+  primary: The primaryDisk proxy.
+  temporary: The RAM-FS proxy.
+  (These entries are included in the
+    above list - these fields serve
+    to identify the components.)
+
+"s.*": Allows receiving a signal.
+       Totally useless for any signal
+        prefixed with "k." or "x." -
+        "k." is always let through,
+        and "x." can't be sent to you
+        in a situation where you
+        don't have permission,
+        under normal circumstances.
+
+"k.root": The kernel's _ENV table.
+
+"k.computer": The "computer" table,
+               with wrapMeta applied,
+               pullSignal removed,
+               and also pushSignal.
+
+"k.kill": function (pid) to kill any
+           process on the system.
+
+"r.*": Registers a service's API for
+ retrieval via the "x." mechanism.
+ Returns a:
+ function (function (pkg, pid, send))
+ While the registration is locked on
+  success, attempting to use it will
+  fail, as no handler has been given.
+ The returned function finishes the
+  registration with a callback used
+  for when a process tries to use the
+  registered API.
+ What that API returns goes to the
+  target process.
+ The given "sendSig" function can be
+  used to send an event to the target
+  process, the type of which matches
+  the "x." name of the access, and
+  the parameters being those given to
+  sendSig.
+ So sendSig(1) from a service
+  registered via "r.carrot" would
+  generate the event: "x.carrot", 1.
+ (NOTE: Regarding management of
+  processes that die, just make sure
+  to check for k.procdie events and
+  handle as necessary.)
+
+"x.*": Accesses a registered service
+ API, returning whatever that service
+ intends to give you. Also gives you
+ "s.x.*" automatically to receive the
+ output of sendSig.

repository/docs/kn-refer

@@ -0,0 +1,282 @@
+This is a full reference on those
+ functions and fields exposed by the
+ kernel to processes and libraries.
+
+Firstly, it is important to note that
+ a process runs within a coroutine.
+
+This allows a highly "traditional"
+ form of mixing async and synchronous
+ code with event-loop nesting and
+ such designs. If this is not to your
+ taste then you can just use one, not
+ nested event loop.
+
+As it runs in a coroutine, events are
+ received via coroutine.yield() -
+ sandboxers beware! You may have to
+ use coroutine.running() in order to
+ successfully hide the implementation
+ details of your sandbox (also events
+ and potentially accesses headed in
+ its direction...)
+
+An example KittenOS NEO program,
+ solely using kernel APIs,
+ that you will likely have to kill:
+
+neo.scheduleTimer(os.uptime() + 1)
+while true do
+ local ev = coroutine.yield()
+ if ev == "k.timer" then
+  neo.emergency("Hello...")
+  neo.scheduleTimer(os.uptime() + 1)
+ end
+end
+
+This will say "Hello..." via the
+ neo.emergency mechanism once every
+ second, independently of anything
+ else on the system.
+
+While this is obviously not a sane
+ sys-init for actual use, if you have
+ a disk that you can copy the kernel
+ to and a copy of this, it might make
+ a fun experiment.
+
+The way to exit the program is to
+ return from your process's main
+ function.
+
+The first field to note is:
+
+_VERSION: _VERSION from the host.
+
+The following are just wrapMeta'd
+ host libraries (*: altered):
+
+math, table, string, unicode*,
+ coroutine, os*, debug
+
+unicode is extended with:
+ safeTextFormat(s, p):
+  Takes a string s, and a position p,
+   (the position is optional, and is
+     assumed to be 1 otherwise)
+   and returns a space-padded string,
+    with a space after each wide char
+    to make unicode.len & co. act in
+    screen units, along with the
+    position translated.
+ undoSafeTextFormat(s):
+  Takes a string in padded-widechar
+   format, and gets rid of the pad.
+  Note that if padding is *missing*,
+   wide characters become spaces.
+  This leaves a string that's usually
+   safe to pass to a GPU without any
+   odd graphical glitches.
+
+os is replaced with:
+ totalMemory = computer.totalMemory,
+ freeMemory = computer.freeMemory,
+ energy = computer.energy,
+ maxEnergy = computer.maxEnergy,
+ clock = os.clock, date = os.date,
+ difftime = os.difftime,
+ time = os.time,
+ uptime = computer.uptime,
+ address = computer.address
+
+The following are just wrapMeta'd
+ host functions
+ (*: wrapped for security):
+
+ assert, ipairs, load, next*,
+ pairs, pcall, xpcall, select,
+ type, error, tonumber, tostring,
+ setmetatable, getmetatable*,
+ rawset*, rawget, rawlen, rawequal
+
+"require" and "neo" are the parts of
+ the environment where a NEO-specific
+ nature presents itself.
+
+require takes a string, and returns
+ the value returned by the library at
+ "libs/" .. str .. ".lua" on the
+ primary disk.
+The library name must be a valid path
+ component, and the library path must
+ also be valid - see
+ ensurePathComponent, ensurePath for
+ more info.
+
+The "neo" table is where most of the
+ NEO-specificness is hiding, which is
+ probably shown by its name.
+
+It is also where libraries differ to
+ processes, as libraries get a subset
+ of the table.
+
+For libraries, it contains:
+ emergency: Equals ocemu.log, if
+  available on the system. Else, NOP.
+ readBufSize: The readBufSize kernel
+  configuration value. Default: 2048.
+  Adjusting this in the kernel allows
+   adjusting how much the system will
+   read at any given time, which can
+   have non-obvious memory usage
+   effects.
+  Do note, following this limit is
+   not a requirement and is not
+   enforced - it's not a security
+   matter, just optimization/memory.
+ wrapMeta: A function that takes a
+  value, and wraps it in such a way
+  as to be immutable, returning the
+   wrapped value.
+  This is the first line of defense
+   against memory use - by using this
+   to protect a table, the result can
+   be shared between untrusted code.
+ listProcs: A function that returns a
+  table of processes. Index is ipairs
+  -friendly, values are:
+  {pid, pkg, cpuUsageInSeconds}
+ listApps: Returns an ipairs-friendly
+  list of applications on the system,
+  such as:
+  {"app-out-of-sight-is-out-of-mind",
+   "svc-i-see-the-ones-that-play"}
+ listLibs: Returns an ipairs-friendly
+  list of libraries on the system,
+  such as:
+  {"fmttext",
+   "braille"}
+ totalIdleTime: Returns the current
+  kernel idle time total, useful for
+  measuring current CPU usage, and in
+  turn comparing to application CPU
+  time to get various statistics.
+ ensurePath: (s, root)
+  Attempts to verify the
+  safety of a path, and errors if any
+  aspect seems incorrect.
+  The root must be a prefix to the
+   path, and the path must follow a
+   strict standardized form that is
+   guaranteed to always be supported
+   and handled in the same way on any
+   OC system.
+  Essentially, "//" must not occur,
+   and all "[^/]+" matches must be
+   valid path components.
+ ensurePathComponent: (s)
+  Ensures that a string is a safe
+   filename via a character list and
+   some special filename checks.
+  UTF-8 characters are just flat out
+   disallowed until someone can give
+   me proof they won't blow up
+   something somewhere.
+  (This restriction is Windows's
+   fault - I can't trust the encoding
+   mess to not find some new and
+   imaginative way of breaking
+   filenames, so I'd rather that they
+   get avoided until someone can try
+   actually using them.)
+  This does NOT ACCOUNT for *all* the
+   Windows total nonsense (aux, com1)
+   because if OC doesn't cover up
+   that then you're kinda doomed.
+ ensureType: (v, ts)
+  Checks that a value is of a given
+   type, and errors otherwise. If the
+   type is "table", it also errors if
+   a metatable exists.
+
+The additional things available to
+ processes are those things that
+ require a process to use:
+
+ pid: A field that specifies the
+  process ID of this process.
+  Harmless, but not entirely useful.
+ dead: Actually a field, that isn't
+  set at first, but is set later to
+  indicate deadness. Useful if your
+  process does anything that might
+  lead to functions being called in
+  the afterlife, such as providing an
+  API.
+ executeAsync: Function that takes
+  an app name (aka: pkg), and a
+  set of arguments to give it.
+  NOTE: sys- apps cannot be started
+   from non sys- apps no matter how
+   hard you try, without k.root
+   alterations to runProgramPolicy.
+  Your process pkg and ID is
+   prepended to the arguments.
+  NOTE: This uses the result, err
+   return format, except for security
+   errors in which case it uses a
+   full error, because you might just
+   ignore the return value.
+  A successful result is the PID.
+ executeExt: Like executeAsync, but
+  firstly, synchronous, and secondly,
+  with an extra first parameter that
+  contains a function to call on
+  events encountered during the time.
+  As for the return values, it tries
+   to emulate os.execute, so it
+   returns -1 & reason on load error,
+   and 0 & death-reason otherwise.
+ execute: executeExt, but with the
+  first parameter set to a blank
+  function.
+ requestAccessAsync: A function that
+  takes an access ID (aka 'perm') as
+  a string (see kn-perms for info),
+  and starts a security request that
+  is responded to with a
+  k.securityresponse such as:
+  "k.securityresponse", perm, obj
+ requestAccess: A function with
+  (perm, handler) as the arguments -
+  runs requestAccessAsync, then sends
+  events to handler (if any) while
+  waiting for the response.
+ requireAccess: requestAccess, but
+  (perm, reason) - the reason is used
+   in an error if the access cannot
+   be gained.
+ scheduleTimer: Given an os.uptime
+  value, creates a timer and returns
+  a completely meaningless table that
+  is never touched by the kernel
+  directly, called the "tag".
+  The resulting event:
+  "k.timer", tag, time, ofs
+  These events are ONLY EVER sent as
+   a consequence of this function,
+   and this can be relied on safely.
+  NOTE: Setting timers too far in the
+   future has effects on system
+   stability. So does using memory,
+   and there's no way for me to stop
+   that, either. So long as the timer
+   is reached, alive or dead, things
+   will work, but spamming timers has
+   the consequence of memory use,
+   and timers stick around after the
+   process that owns them is dead.
+
+With that, I hope I have documented
+ the kernel's interface to programs.

repository/docs/kn-sched

@@ -0,0 +1,70 @@
+This is an overview of what a program
+ can expect from the scheduler.
+
+The kernel's scheduling is entirely,
+ and I mean entirely, timer-based.
+
+Everything in the kernel,
+ that has to occur the next time the
+ CPU has reached the main loop,
+ is, without exception, a timer,
+ apart from the timer system itself.
+
+That last note is important, since as
+ the timer system controls sleeping,
+ it must use computer.pullSignal -
+ thus, that part of the mechanism is
+ not in itself a timer - it is the
+ mechanism that waits for timers.
+
+Signals that have been retrieved with
+ computer.pullSignal, however, do
+ become timers.
+
+Timers are kept in a list, and have
+ their "target uptime" - the
+ computer.uptime() at which they are
+ due to be executed, their callback,
+ and after the callback, a list of
+ arguments to give to the callback.
+
+The current time as KittenOS NEO
+ sees it is available as os.uptime().
+ (and the address, as os.address() -
+ bit of a cheat, but who's counting?)
+
+This source is always in seconds, and
+ so KittenOS NEO timing is always in
+ seconds.
+
+The scheduling loop's precise details
+ are in the kernel itself, and any
+ precise description would be a
+ translation into pseudocode of what
+ is already there.
+
+But it suffices to note that the
+ scheduling loop works by, 16 times
+ at most, executing and removing all
+ timers from first defined to last
+ that have passed their time,
+ and getting the minimum time of all
+ unexecuted timers during each loop.
+
+The last minimum time, if it exists,
+ is then bounded to at least 0.05,
+ an OC minimum value for a yield.
+
+The pullSignal is then called with
+ the bounded time, if any.
+
+(If no bounded time exists, then the
+ system goes into more or less a deep
+ freeze, which is useful to conserve
+ energy, even when apps are "running"
+ but aren't using timers.)
+
+If there is any signal, distEvent is
+ called to distribute it to those
+ processes with the right accessses,
+ with an "h." prefix.

repository/docs/ul-broil

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+Hello World.

repository/docs/ul-neoux

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+Hello World.

repository/docs/us-perms

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+Hello World.