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265 commits

Author SHA1 Message Date
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