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357 Commits

Author SHA1 Message Date
Andreas Kling
72cbcd8e98 Kernel: Dump backtrace on exit() syscall. 
This makes assertion failures a lot more pleasant to investigate.
 2019-05-06 21:48:48 +02:00
Andreas Kling
780d2a08c4 IPv4: Save the source address/port together with incoming packet payloads. 
We need the address/port to fill in the out-params in recvfrom().
It should now be more or less possible to create a UDP server. :^)
 2019-05-04 03:27:50 +02:00
Andreas Kling
8b249bd09b Kernel+Userland: Implement mknod() syscall and add a /bin/mknod program. 2019-05-03 22:59:58 +02:00
Andreas Kling
03da7046bd Kernel: Prepare Socket for becoming a File. 
Make the Socket functions take a FileDescriptor& rather than a socket role
throughout the code. Also change threads to block on a FileDescriptor,
rather than either an fd index or a Socket.
 2019-05-03 20:15:54 +02:00
Andreas Kling
c3b7ace3e0 Kernel: Assign Lock names in class member initializers. 2019-05-02 03:28:20 +02:00
Andreas Kling
14ac77131b Kernel: The exit_thread() syscall should unlock the big lock. 
Since exit_thread() never returns, it can't rely on the syscall trap handler
to unlock the big lock before returning.
 2019-04-29 15:56:25 +02:00
Andreas Kling
d07be1087a Kernel+LibC: Add exit_thread() syscall. 2019-04-29 15:17:20 +02:00
Andreas Kling
8cbb7f101f Kernel: Have File virtuals take a FileDescriptor& rather than a Process&. 
This will allow us to implement different behaviors depending on the role
of the descriptor a File is being accessed through.
 2019-04-29 13:58:40 +02:00
Andreas Kling
0a0d739e98 Kernel: Make FIFO inherit from File. 2019-04-29 04:55:54 +02:00
Andreas Kling
e886337a67 Kernel: Make ProcessTracer inherit from File. 2019-04-28 15:02:55 +02:00
Andreas Kling
679ac386eb Kernel: "Succeed" quietly for zero-length read() and write(). 2019-04-27 16:17:24 +02:00
Andreas Kling
490e89e240 LibC: Add execvpe() and make execvp()'ed children inherit environment. 2019-04-26 03:16:26 +02:00
Andreas Kling
d5578826af Kernel: Make it possible to look up FIFO's by ID. 
This will be useful when implementing the /proc/PID/fd/N links where N is
a file descriptor referring to a FIFO.
 2019-04-25 13:53:24 +02:00
Andreas Kling
c5c4e54a67 Kernel: Process destruction should destroy all child threads. 
We were only destroying the main thread when a process died, leaving any
secondary threads around. They couldn't run, but because they were still
in the global thread list, strange things could happen since they had some
now-stale pointers to their old process.
 2019-04-23 22:17:01 +02:00
Andreas Kling
5c68929aa1 Kernel: Add a systrace() syscall and implement /bin/strace using it. 
Calling systrace(pid) gives you a file descriptor with a stream of the
syscalls made by a peer process. The process must be owned by the same
UID who calls systrace(). :^)
 2019-04-22 18:44:45 +02:00
Andreas Kling
a9d09e9020 Kernel: Get rid of the "cool globals" thingy. 
This was something I used while debugging with Computron. I haven't needed
it for months, so let's get rid of it. It's trivial to readd if needed.
 2019-04-21 12:33:14 +02:00
Andreas Kling
5f63f8120c Kernel: Remove "restorer" field from SignalActionData. 
I was originally implementing signals by looking at some man page about
sigaction() to see how it works. It seems like the restorer thingy is
system-specific and not required by POSIX, so let's get rid of it.
 2019-04-20 19:32:14 +02:00
Andreas Kling
b2ebf6c798 Kernel: Shrink Thread by making kernel resume TSS heap-allocated. 2019-04-20 19:23:45 +02:00
Andreas Kling
ec365b82d5 Kernel: Make the colonel run at "Idle" priority (the lowest possible.) 
This means it won't hog the CPU for more than a single timeslice. :^)
 2019-04-20 15:58:45 +02:00
Andreas Kling
5eedb22834 Sprinkle use of AK::Vector in various places. 
Some of these are less helpful than others. Avoiding a bunch of mallocs
in the event loop wakeup code is definitely nice.
 2019-04-20 14:02:19 +02:00
Andreas Kling
1debc0a78c Kernel: Reduce kmallocing in all_processes() and all_pids(). 2019-04-16 00:37:35 +02:00
Andreas Kling
ae0dc22716 Kernel: Make validate_read_from_kernel() return early for nullptr checks. 
Null pointers are always invalid, so don't bother going through all the
various checks for them.
 2019-04-15 23:48:31 +02:00
Andreas Kling
13041f894f Kernel: Start using StringView in the VFS class. 
The less kmalloc() we can do, the better. Calling kmalloc() disables all
interrupts while it runs, so it's directly affecting responsiveness.
 2019-04-15 14:57:27 +02:00
Andreas Kling
3f6408919f AK: Improve smart pointer ergonomics a bit. 2019-04-14 02:36:06 +02:00
Andreas Kling
29d0412a06 Kernel: Remove system.h and make the uptime global a qword. 2019-04-14 01:29:14 +02:00
Andreas Kling
60a819c14a Kernel: Yet more work on bringing up POSIX SHM. 2019-04-09 02:37:38 +02:00
Andreas Kling
26a06f3fcd Kernel: More work towards POSIX SHM, also add ftruncate(). 2019-04-09 01:10:00 +02:00
Andreas Kling
99f3cc26c3 Kernel+LibC: Add stubs for POSIX shared memory API. 
Specifically shm_open() and shm_unlink(). This patch just adds stubs.
 2019-04-08 23:44:12 +02:00
Andreas Kling
65d6318c33 Kernel: Support non-blocking connect(). 
If connect() is called on a non-blocking socket, it will "fail" immediately
with -EINPROGRESS. After that, you select() on the socket and wait for it to
become writable.
 2019-04-08 04:52:21 +02:00
Andreas Kling
37ae00a4dd Kernel+Userland: Add the rename() syscall along with a basic /bin/mv. 2019-04-07 23:35:26 +02:00
Andreas Kling
644c887594 Kernel: Move FIFO into FileSystem/ and Socket+LocalSocket into Net/. 2019-04-06 20:29:48 +02:00
Andreas Kling
ac6c7d3e19 Kernel: Use alloc_fd() more instead of walking fd list manually. 2019-04-06 14:54:32 +02:00
Andreas Kling
a58d7fd8bb Kernel: Get rid of Kernel/types.h, separate LinearAddress/PhysicalAddress. 2019-04-06 14:29:29 +02:00
Andreas Kling
b9738fa8ac Kernel: Move VM-related files into Kernel/VM/. 
Also break MemoryManager.{cpp,h} into one file per class.
 2019-04-03 15:13:07 +02:00
Andreas Kling
a095a90b51 Kernel: Remove ancient nprocess and nblocked globals. 
These were not in sync with reality, and not used anywhere anyway.
 2019-04-03 13:05:20 +02:00
Andreas Kling
ab43658c55 Kernel: Move devices into Kernel/Devices/. 2019-04-03 12:36:40 +02:00
Andreas Kling
072ea7eece Kernel: Move ELF-related files into Kernel/ELF/. 2019-04-03 12:30:04 +02:00
Andreas Kling
9fca94269e Kernel: Move TTY-related files into Kernel/TTY/. 2019-04-03 12:28:45 +02:00
Andreas Kling
f9864940eb Kernel: Move FS-related files into Kernel/FileSystem/ 2019-04-03 12:25:24 +02:00
Andreas Kling
d11b5407a3 Kernel: Get rid of the GPL elf.h and import exec_elf.h from OpenBSD. 2019-04-03 11:30:56 +02:00
Andreas Kling
649c81a714 Kernel: Move networking related files into Kernel/Net/. 2019-04-02 19:54:38 +02:00
Andreas Kling
d5a9f4596b Kernel: Add a blunt big process lock. 
We can't have multiple threads in the same process running in the kernel
at the same time, so let's have a per-process lock that threads have to
acquire on syscall entry/exit (and yield while blocked.)
 2019-04-01 20:04:29 +02:00
Andreas Kling
245c4bd7c8 Kernel: Add a bit of debug output in do_exec() to learn about thread counts. 2019-03-30 21:14:40 +01:00
Andreas Kling
44e1e7423f Kernel: Put a bunch of debug spam behind #ifdefs. 2019-03-27 15:07:12 +01:00
Andreas Kling
a2fe5f8517 Kernel: Don't disable interrupts during Process destruction. 2019-03-27 14:38:32 +01:00
Andreas Kling
1592612a60 Kernel: Don't disable interrupts during Thread destruction. 2019-03-27 14:30:13 +01:00
Andreas Kling
75207ddffd Kernel: Load ELF executable pages lazily when possible. 
This currently only works for "normal" processes created by fork().
It does not work for create_user_process() processes spawned by the
kernel, as those are a bit special during construction.
 2019-03-27 04:01:15 +01:00
Andreas Kling
500df578fe LibGUI+Kernel: Add a GLock class (userspace mutex.) 
It's basically a userspace port of the kernel's Lock class.
Added gettid() and donate() syscalls to support the timeslice donation
feature we already enjoyed in the kernel.
 2019-03-25 13:03:49 +01:00
Andreas Kling
ab11f42094 Kernel: Do timekeeping manually instead of asking the RTC all the time. 
This introduces a tiny amount of timer drift which I will have to fix
somehow eventually, but it's a huge improvement in timing consistency
as we no longer suddenly jump from e.g 10:45:49.123 to 10:45:50.000.
 2019-03-25 02:06:57 +01:00
Andreas Kling
239c0bd6a6 Kernel: Make block() and yield() automatically call Scheduler::yield(). 
This exposed some places we were accidentally doing a double yield().
 2019-03-24 01:52:10 +01:00
Andreas Kling
5713c3a0cb Kernel: Fix broken destruction order for Process/Thread. 2019-03-24 01:20:35 +01:00
Andreas Kling
e561ab1b0b Kernel+LibC: Add a simple create_thread() syscall. 
It takes two parameters, a function pointer for the entry function,
and a void* argument to be passed to that function on the new thread.
 2019-03-23 22:59:08 +01:00
Andreas Kling
60d25f0f4a Kernel: Introduce threads, and refactor everything in support of it. 
The scheduler now operates on threads, rather than on processes.
Each process has a main thread, and can have any number of additional
threads. The process exits when the main thread exits.

This patch doesn't actually spawn any additional threads, it merely
does all the plumbing needed to make it possible. :^)
 2019-03-23 22:03:17 +01:00
Andreas Kling
367bb9e4eb Kernel: Remove ioctl for getting a socket peer's PID. 
Now that everything is nice and mature, the WindowServer can just use the
client PID it receives in the Greeting message, and we can get rid of this
hacky ioctl. :^)
 2019-03-20 17:14:48 +01:00
Andreas Kling
bc1da7f1fd Kernel: Snooze the NetworkTask until there are incoming packets to process. 
This is accomplished using a new Alarm class and a BlockedSnoozing state.
Basically, you call Process::snooze_until(some_alarm) and then the scheduler
won't wake up the process until some_alarm.is_ringing() returns true.
 2019-03-20 17:09:46 +01:00
Andreas Kling
e48cbf3c8c Kernel: connect() should fail with EISCONN for already-connected sockets. 
Also make sure to reset the socket role if Socket::connect() fails.
 2019-03-20 02:38:36 +01:00
Andreas Kling
4aa0ab4e08 Kernel: Fix race between accept() and connect(). 
We had a bug where an accepted socket would appear to be EOF/disconnected
on the accepting side until the connecting side had called attach_fd().

Fix this by adding a new SocketRole::Connecting state.
 2019-03-20 02:33:51 +01:00
Andreas Kling
69ffaa366d Kernel: Handle unaligned ELF segments gracefully in the executable loader. 2019-03-14 14:51:43 +01:00
Andreas Kling
66d55f8e0c IPv4: More work on the TCP implementation. 
I can now establish a connection to my little test server on the host.
 2019-03-14 00:20:44 +01:00
Andreas Kling
032d9d7065 IPv4: More hacking on bringing up TCP support. 
This was a bit more complicated than I expected, but it's moving forward.
 2019-03-13 23:14:30 +01:00
Andreas Kling
19a51132f5 Kernel: recvfrom() should treat the address arguments as outparams. 2019-03-13 14:47:21 +01:00
Andreas Kling
562663df7c Add support for socket send/receive timeouts. 
Only the receive timeout is hooked up yet. You can change the timeout by
calling setsockopt(..., SOL_SOCKET, SO_RCVTIMEO, ...).

Use this mechanism to make /bin/ping report timeouts.
 2019-03-13 13:15:05 +01:00
Andreas Kling
ce7c302933 Kernel: Oops, gettimeofday()'s tv_usec should be micro, not milliseconds. 2019-03-13 03:25:18 +01:00
Andreas Kling
a7d5e9781a Kernel+LibC+Userland: Yet more networking bringup hacking. 
All ICMP sockets now receive all ICMP packets. All this buffering is gonna
need some limits and such.
 2019-03-12 17:27:07 +01:00
Andreas Kling
a017a77442 Kernel+LibC+Userland: Start working on an IPv4 socket backend. 
The first userland networking program will be "ping" :^)
 2019-03-12 15:51:42 +01:00
Andreas Kling
c6a2012fe9 Kernel: Collect IPv4 stuff in IPv4.h and ARP stuff in ARP.h. 2019-03-12 12:49:01 +01:00
Andreas Kling
a36eaeb18c Kernel: Remove accidentally committed debugging code. 2019-03-11 01:57:34 +01:00
Andreas Kling
1678ac69ef Kernel: More work on Ethernet support. 2019-03-10 23:40:09 +01:00
Andreas Kling
97664fad60 Kernel: A bunch of hacking towards initial Ethernet support. 2019-03-10 20:59:23 +01:00
Andreas Kling
eda0866992 Add a C++ helper class for working with shared buffers. 
This is a bit more comfortable than passing the shared buffer ID manually
everywhere and keeping track of size etc.
 2019-03-08 12:24:05 +01:00
Andreas Kling
e56fe71dbc Kernel: And some more KResult/KResultOr<T> porting work. 2019-03-06 22:30:13 +01:00
Andreas Kling
028afabf6b Kernel: Port more code to KResult and KResultOr<T>. 2019-03-06 22:14:31 +01:00
Andreas Kling
1cc32ebc7e Kernel: Remove "requested wakeups" feature. 
I only needed this to support the WindowServer living inside the kernel.
Now that it's been migrated to userspace, this can go. :^)
 2019-03-05 13:34:36 +01:00
Andreas Kling
91031346e5 Kernel: More signal handling improvements. 
Finally fixed the weird flaky crashing when resizing Terminal windows.
It was because we were dispatching a signal to "current" from the scheduler.
Yet another thing I dislike about even having a "current" process while
we're in the scheduler. Not sure yet how to fix this.

Let the signal handler's kernel stack be a kmalloc() allocation for now.
Once we can do allocation of consecutive physical pages in the supervisor
memory region, we can use that for all types of kernel stacks.
 2019-03-05 12:52:35 +01:00
Andreas Kling
9e1fcb74a2 Kernel: Returning from a signal handler reset the signal mask correctly. 
We were setting the handled signal number as the new signal mask, oops.
 2019-03-05 11:00:26 +01:00
Andreas Kling
251293f2e1 Kernel: Block a signal from being dispatched again until handler returns. 
We don't handle nesting yet, but this is a step in the right direction.
 2019-03-05 10:34:08 +01:00
Andreas Kling
67fc42f64e Kernel: SIGCONT should unblock a blocked process. 
Otherwise we might stay in BlockedSignal state forever. Unblocking just
means that the current syscall may fail with EINTR.
 2019-03-04 11:25:24 +01:00
Andreas Kling
725b57fe1f Kernel: Try to do the right thing by default for unhandled signals. 2019-03-03 12:13:41 +01:00
Andreas Kling
2c5a378ccc Kernel+Userland: Add symlink() syscall and add "-s" flag to /bin/ln. 
It's now possible to create symbolic links! :^)

This exposed an issue in Ext2FS where we'd write uninitialized data past
the end of an inode's content. Fix this by zeroing out the tail end of
the last block in a file.
 2019-03-02 01:52:24 +01:00
Andreas Kling
37f6844c6c Kernel: Port stat() to KResult/KResultOr<T>. 2019-03-02 00:11:27 +01:00
Andreas Kling
f75eb9af16 Kernel: Support chdir() to a directory that's executable but not readable. 
Also the superuser should be allowed to resolve any possible path without
getting tripped up by EACCES.
 2019-03-01 23:54:07 +01:00
Andreas Kling
274b0260f7 Kernel: Don't send SIGCHLD to parent process if he has SA_NOCLDWAIT set. 
Just transfer ownership of the dead process to the colonel and let the
scheduler reap it on next iteration.
 2019-03-01 15:52:05 +01:00
Andreas Kling
1b16a29044 Kernel+Userland: Implement fchmod() syscall and use it to improve /bin/cp. 
/bin/cp will now copy the permission bits from source to destination. :^)
 2019-03-01 10:39:19 +01:00
Andreas Kling
e427b514dc Kernel: Implement basic SIGSTOP and SIGCONT support. 2019-02-28 12:27:26 +01:00
Andreas Kling
c09ab7cc40 Kernel: Only allow sending signals to process you own. 2019-02-28 11:46:38 +01:00
Andreas Kling
258f4671ea Kernel: kill() syscall should support sending a signal to yourself. 2019-02-28 09:44:48 +01:00
Andreas Kling
60d0a48be5 Kernel: Use KResult in link(). 2019-02-27 15:31:26 +01:00
Andreas Kling
5b27f11b97 Kernel: Use KResult in unlink() and rmdir(). 2019-02-27 14:11:25 +01:00
Andreas Kling
1d2529b4a1 Add chown() syscall and a simple /bin/chown program. 2019-02-27 12:32:53 +01:00
Andreas Kling
e421c10735 More compat work towards porting vim. 
It now builds and runs in the small-featureset configuration. :^)
 2019-02-27 00:02:01 +01:00
Andreas Kling
a356746d04 Compat work towards porting vim. 2019-02-26 15:57:59 +01:00
Andreas Kling
e0c1541847 Compat work towards making bash-5.0 build with less patches. 
Hacked implementations of sigsetjmp() and siglongjmp(). I didn't know about
these APIs until just now, but I hope I got them right.
 2019-02-26 14:05:28 +01:00
Andreas Kling
cccc8d8aeb More compat work. 
Move syscall to int 0x82 since using int 0x80 was kinda prone to fork bombs
when building things on Linux. :^)
 2019-02-26 12:57:02 +01:00
Andreas Kling
9624b54703 More moving towards using signed types. 
I'm still feeling this out, but I am starting to like the general idea.
 2019-02-25 22:06:55 +01:00
Andreas Kling
beda478821 Kernel: Make syscalls that take a buffer size use ssize_t instead of size_t. 
Dealing with the unsigned overflow propagation here just seems unreasonably
error prone. Let's limit ourselves to 2GB buffer sizes instead.
 2019-02-25 21:21:12 +01:00
Andreas Kling
5af4e622b9 Kernel: Add KResult and KResultOr<T> classes. 
The idea here is to combine a potential syscall error code with an arbitrary
type in the case of success. I feel like this will end up much less error
prone than returning some arbitrary type that kinda sorta has bool semantics
(but sometimes not really) and passing the error through an out-param.

This patch only converts a few syscalls to using it. More to come.
 2019-02-25 20:50:22 +01:00
Andreas Kling
15fb917f28 Convert more RetainPtr use to Retained. 2019-02-25 16:04:08 +01:00
Andreas Kling
f98dcbf1d6 Kernel: Respect the process umask in open() and mkdir(). 2019-02-22 02:39:13 +01:00
Andreas Kling
6d3e12899b Kernel: Pass process arguments directly on the stack. 
Get rid of the convoluted get_arguments and get_environment syscalls.
This patch also adds a simple /bin/env that just prints its environment.
 2019-02-22 01:55:22 +01:00
Andreas Kling
e969419202 Kernel: Don't allocate and discard an extra stack for every process. 2019-02-22 00:27:06 +01:00