This is obviously not always the right thing to do, but it removes some
confusion while using other resolutions. Eventually we're gonna need some
kind of compressed image decoder.
I had to change PhysicalPage around a bit for this. Physical pages can now
be instantiated for any arbitrary physical address without worrying that
such pages end up in the kernel page allocator when released.
Most of the pieces were already in place, I just glued everything together.
Track how many fds are open for a socket's Accepted and Connected roles.
This allows fork() to clone a socket fd without a subsequent close() walking
all over the parent process's fd.
Turns out FD_CLOEXEC and O_CLOEXEC are different values. Silly mistake.
I noticed that Terminal's shell process still had the Terminal's window
server connection open, albeit in a broken state.
When the kernel performs a successful exec(), whatever was on the kernel
stack for that process before goes away. For this reason, we need to make
sure we don't have any stack objects holding onto kmalloc memory.
These functions don't exit immediately, but rather on the next iteration
of the event loop.
Since exit() is already used by the standard library, let's call it quit()
instead. That way, saying exit() means the same thing here as anywhere else.
The mismatch between the two was causing some trouble if you'd mmap e.g 1KB
and then try to munmap() it. The kernel would whine that it couldn't find
any such mapping (because mmap() actually rounded the 1KB to a 4KB page.)
This mistake created an incredible amount of confusion. We would allocate
a slightly too small Painter on the stack and then invoke its constructor,
overwriting whatever came after it on the stack.
This is a monster patch that required changing a whole bunch of things.
There are performance and stability issues all over the place, but it works.
Pretty cool, I have to admit :^)
Maybe there will be other types of physical ranges to map in the future.
This API doesn't seem at all specific to framebuffers.
Also tidy up a bit in BochsVGADevice.
Currently you can only mmap the entire framebuffer.
Using this when starting up the WindowServer gets us yet another step
closer towards it moving into userspace. :^)
