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304 Commits

Author SHA1 Message Date
Andreas Kling
4dd50b1f6d Get rid of three test utilities that I no longer need. 2018-12-21 02:22:21 +01:00
Andreas Kling
ec1c487dcd Yet another pass of style fixes. 2018-12-21 02:10:45 +01:00
Andreas Kling
89040cdc99 Add a "syncd" kernel process that periodically calls sync(). 2018-12-20 02:41:55 +01:00
Andreas Kling
ed7ae6c02c Add sync() syscall and a /bin/sync. 
It walks all the live Inode objects and flushes pending metadata changes
wherever needed.

This could be optimized by keeping a separate list of dirty Inodes,
but let's not get ahead of ourselves.
 2018-12-20 00:39:29 +01:00
Andreas Kling
d0f06e5f3f Automatically call Inode::flush_metadata() before an Inode is destroyed. 
Use a little template magic to have Retainable::release() call out to
T::will_be_destroyed() if such a function exists before actually calling
the destructor. This gives us full access to virtual functions in the
pre-destruction code.
 2018-12-19 22:28:09 +01:00
Andreas Kling
1f44cd9dd9 Reworked Inode to have a dirty bit and subclass-implemented flush_metadata(). 
This way we can defer disk writes as long as we like. There's no automatic
flushing happening just yet.
 2018-12-19 21:56:45 +01:00
Andreas Kling
d506c857ab Rename CoreInode to Inode. 
I don't know what I was thinking here. Clearly Inode is the right name.
 2018-12-19 21:18:28 +01:00
Andreas Kling
038d8641f9 Implement utime() along with a naive /bin/touch. 
This synchronous approach to inodes is silly, obviously. I need to rework
it so that the in-memory CoreInode object is the canonical inode, and then
we just need a sync() that flushes pending changes to disk.
 2018-12-19 21:14:55 +01:00
Andreas Kling
4f6438ec66 VirtualConsole: Support the 'A' and 'D' CSI sequences. 
This makes backspace work correctly when line editing with bash-2.05b.
 2018-12-07 01:19:02 +01:00
Andreas Kling
a8c7b6ce86 VirtualConsole: The rightmost column is always a default horizontal tab. 2018-12-07 00:26:12 +01:00
Andreas Kling
2850225587 VirtualConsole: Don't output the bell character. 2018-12-07 00:21:25 +01:00
Andreas Kling
87b10f6e6e Add basic support for horizontal tabs in the VirtualConsole. 2018-12-07 00:19:08 +01:00
Andreas Kling
ca6847b5bb Import a simple text editor I started working on. 2018-12-04 00:27:16 +01:00
Andreas Kling
405383fd2f Refactor the FIFO implementation to use a DoubleBuffer as backing store. 
This is considerably more efficient than using a CircularQueue.
 2018-12-03 02:24:11 +01:00
Andreas Kling
afc56d151f Omit duplicate lines from the ksyms map. 2018-12-03 02:23:49 +01:00
Andreas Kling
bbfae19238 Move DoubleBuffer to its own files. 2018-12-03 01:51:44 +01:00
Andreas Kling
aff89d2fd7 Yet more coding style fixes. 2018-12-03 01:38:22 +01:00
Andreas Kling
f31e1ceab0 Move InlineLinkedList to AK. 2018-12-03 01:18:54 +01:00
Andreas Kling
e7cc08226f Implement basic support for times(). 
The kernel now bills processes for time spent in kernelspace and userspace
separately. The accounting is forwarded to the parent process in reap().

This makes the "time" builtin in bash work.
 2018-12-03 01:14:19 +01:00
Andreas Kling
4bc87dc7b9 Share the "blocked-on file descriptor" number between read() and write(). 
A process can't be reading and writing at the same time, so it's fine for
them to share the variable for the blocked FD.
 2018-12-03 00:42:48 +01:00
Andreas Kling
f6e27c2abe More coding style changes. 2018-12-03 00:39:25 +01:00
Andreas Kling
407bb3e76e Some coding style fixes. I'm getting more comfortable with this style. 2018-12-03 00:20:00 +01:00
Andreas Kling
85b886c2e0 Make it possible to build the Kernel on a macOS host. 
It still requires an ELF compiler and linker, but at least it builds.
I need to get rid of the "Unix" namespace. This does a lot of that.
 2018-12-02 23:34:50 +01:00
Andreas Kling
44036f32bc Move ELFLoader code into Kernel/. 2018-12-02 20:27:08 +01:00
Andreas Kling
ac7a60225e Add TIOCGWINSZ ioctl so userland can determine terminal geometry. 
(Don't) use this to implement short-form output in ls.
I'm too tired to make a nice column formatting algorithm.
I just wanted something concise when I type "ls".
 2018-11-29 03:45:23 +01:00
Andreas Kling
f5a83c4d8a Fix bug where a signal-interrupted waitpid() wouldn't return EINTR. 2018-11-28 23:30:49 +01:00
Andreas Kling
464a16afa2 Implement signal() via sigaction() and get rid of sys$signal(). 2018-11-28 22:27:32 +01:00
Andreas Kling
d90104f9e0 Let reap() communicate the dead process's exit status to the caller. 
This way the scheduler doesn't need to plumb the exit status into the waiter.
We still plumb the waitee pid though, I don't love it but it can be fixed.
 2018-11-28 22:01:24 +01:00
Andreas Kling
938d1b8bfb Drop any old signal stacks on exec(). 2018-11-28 20:59:10 +01:00
Andreas Kling
629c5be10b Add basic zero faults. 
mmap() will now map uncommitted pages that get allocated and zeroed upon the
first access. I also made /proc/PID/vm show number of "committed" bytes in
each region. This is so cool! :^)
 2018-11-19 02:17:20 +01:00
Andreas Kling
e88f306d07 Make /proc/PID/vm more readable. 
And move the unreadable detail-heavy mess to /proc/PID/vmo.
 2018-11-19 01:49:19 +01:00
Andreas Kling
de4604ac95 Finally hook up the mkdir code to a syscall. 
Added a /bin/mkdir that makes directories. How very neat :^)
There are various limitations because of missing functionality.
 2018-11-18 15:02:16 +01:00
Andreas Kling
95e0f6ad82 Fix race condition in exec(). 
...also hook up sys$fstat in the syscall dispatcher.
 2018-11-17 00:52:29 +01:00
Andreas Kling
bb9766ee17 Tweak default hostname. 2018-11-17 00:23:39 +01:00
Andreas Kling
9d05f6b7a7 Make bash-2.05b build with minimal changes. 
This is really neat. :^)
 2018-11-17 00:14:07 +01:00
Andreas Kling
2cf477a151 Add fcntl() F_DUPFD which is slightly different from dup2(). 2018-11-16 22:14:40 +01:00
Andreas Kling
6cedb88153 Don't unblock a blocked process when it ignores a signal. 2018-11-16 21:14:25 +01:00
Andreas Kling
a788e85c09 Refactor TTY signal generation a bit. 
We now respect the VINTR and VQUIT control characters in the termios.
 2018-11-16 20:18:58 +01:00
Andreas Kling
4e2c2b9748 Minor TTY tweak. 2018-11-16 18:12:22 +01:00
Andreas Kling
d2046e79cf Add a DoubleBuffer thingy to allow TTY read/write to be interleaved. 
I feel like this concept might be useful in more places. It's very naive
right now and uses dynamically growing buffers. It should really use static
size buffers and never kmalloc().
 2018-11-16 17:57:00 +01:00
Andreas Kling
52d1822c3c Add templated helpers for read/write validation, and one for strings, too. 2018-11-16 16:26:20 +01:00
Andreas Kling
8a286b9244 Improve syscall address validation a bit. 2018-11-16 16:10:59 +01:00
Andreas Kling
084287ca45 Reimplement tcsetattr/tcgetattr as ioctls. 2018-11-16 15:41:48 +01:00
Andreas Kling
c99f8af66d Add ioctl() and reimplement tcsetpgrp/tcsetpgrp as ioctls. 2018-11-16 13:13:50 +01:00
Andreas Kling
2529925fe9 Some more renaming: 
FileSystem -> FS
SyntheticFileSystem -> SynthFS
ProcFileSystem -> ProcFS
Ext2FileSystem -> Ext2FS
Ext2Inode -> Ext2FSInode
 2018-11-15 17:13:10 +01:00
Andreas Kling
8fa2d7104a More VFS cleanup. 2018-11-15 16:04:25 +01:00
Andreas Kling
396a32835b A pass of style/naming cleanup in VFS. 2018-11-15 15:10:30 +01:00
Andreas Kling
457a5df7d5 Rename: 
VirtualFileSystem -> VFS
VirtualFileSystem::Node -> Vnode
 2018-11-15 14:43:10 +01:00
Andreas Kling
c735c56e4c More work on CoreInode. 2018-11-13 23:44:54 +01:00
Andreas Kling
26852a8363 Add metadata to CoreInode. 2018-11-13 13:32:16 +01:00