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Hacked implementations of sigsetjmp() and siglongjmp(). I didn't know about
these APIs until just now, but I hope I got them right.
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Move syscall to int 0x82 since using int 0x80 was kinda prone to fork bombs
when building things on Linux. :^)
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Also show setuid and setgid bits in "ls -l" output. :^)
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And use this to implement shared bitmaps between WindowServer and clients.
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I found a cute program that renders an animated nyancat in the terminal.
This patch adds enough hackery to get it working correctly. :^)
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Looks like that's all we needed, and bc now runs. :^)
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It's really only supported in Ext2FS since SynthFS doesn't really want you
mucking around with its files. This is pretty neat though :^)
I ran into some trouble with HashMap while working on this but opted to work
around it and leave that for a separate investigation.
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This means we only have to do one fill_rect() per line and the whole process
ends up being ~10% faster than before.
Also added a read_tsc() syscall to give userspace access to the TSC.
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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.
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This is really neat. :^)
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I was surprised to find that dup()'ed fds don't share the close-on-exec flag.
That means it has to be stored separately from the FileDescriptor object.
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Another pass at getting bash-1.14.7 to build. Not that many symbols remain.
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Also teach /bin/id to print the user's supplemental groups.
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Implemented some syscalls: dup(), dup2(), getdtablesize().
FileHandle is now a retainable, since that's needed for dup()'ed fd's.
I didn't really test any of this beyond a basic smoke check.
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We're quite far from bash building, but we'll get there eventually!
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There's no support for set-uid or set-gid executables yet so these don't
actually do anything. It's just nice to get the boilerplate stuff in.
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It's really crufty, but it basically works!
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This is quite cool! The syscall entry point plumbs the register dump
down to sys$fork(), which uses it to set up the child process's TSS
in order to resume execution right after the int 0x80 fork() call. :^)
This works pretty well, although there is some problem with the kernel
alias mappings used to clone the parent process's regions. If I disable
the MM::release_page_directory() code, there's no problem. Probably there's
a premature freeing of a physical page somehow.
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For testing, I made cat put itself into a new process group.
This should eventually be done by sh between fork() and exec().
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One more step on the path to being able to ^C a runaway process. :^)
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Ran into a horrendous bug where VirtualConsole would overrun its buffer
and scribble right into some other object if we were interrupted while
processing a character. Slapped an InterruptDisabler onto onChar for now.
This provokes an interesting question though.. if a process is killed
while its in kernel space, how the heck do we release any locks it held?
I'm sure there are many different solutions to this problem, but I'll
have to think about it.
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Also add a little /etc/passwd database. There's just me in there.
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I ran out of steam writing library routines and imported two
BSD-licensed libc routines: sscanf() and getopt().
I will most likely rewrite them sooner or later. For now
I just wanted to see figlet running.
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And print a greeting when sh starts up so we know which TTY we're on.
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We now make three VirtualConsoles at boot: tty0, tty1, and tty2.
We launch an instance of /bin/sh in each one.
You switch between them with Alt+1/2/3
How very very cool :^)
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- sys$readlink + readlink()
- Add a /proc/PID/exe symlink to the process's executable.
- Print symlink contents in ls output.
- Some work on plumbing options into VFS::open().
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It's implemented as a separate process. How cute is that.
Tasks now have a current working directory. Spawned tasks inherit their
parent task's working directory.
Currently everyone just uses "/" as there's no way to chdir().
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- Turn Keyboard into a CharacterDevice (85,1) at /dev/keyboard.
- Implement MM::unmapRegionsForTask() and MM::unmapRegion()
- Save SS correctly on interrupt.
- Add a simple Spawn syscall for launching another process.
- Move a bunch of IO syscall debug output behind DEBUG_IO.
- Have ASSERT do a "cli" immediately when failing.
This makes the output look proper every time.
- Implement a bunch of syscalls in LibC.
- Add a simple shell ("sh"). All it can do now is read a line
of text from /dev/keyboard and then try launching the specified
executable by calling spawn().
There are definitely bugs in here, but we're moving on forward.
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