This will be needed to properly implement ACPI shutdown. It's also
missing PCI configuration space support unlike write_generic_address,
because it would require messing with the PCI subsystem and it's not
necessary for now.
I forgot to do this in be0e1aaf8f.
This makes us actually install that header into the sysroot, unbreaking
ports like openssl, which previously failed to build with:
"fatal error: Kernel/API/POSIX/winsize.h: No such file or directory"
Before this patch, exec commands were inheriting the environment of the
SSHServer instance while interactive shell spawned with an almost empty
env. Now, both paths start with the same basic environment and also
include modifications requested by the ssh client.
This should improve compatibility in a lot of situations but most
visibly it makes syntax highlighting and autocompletion work in
interactive shells.
The list of default environment variables is heavily inspired by what
OpenSSH is doing. Compared to what it produces on my system, we only
lack XDG_*, SSH_* and DBUS_SESSION_BUS_ADDRESS variables. As noted in
the FIXME the value of PATH also differs.
FreeBSD also makes it available from both sys/ioctl.h and termios.h.
glibc doesn't have the POSIX 2024 tc{set,get}winsize() wrappers yet,
so it doesn't even define it in termios.h at the moment.
LLVM relies on sys/ioctl.h defining struct winsize, so the llvm port and
the zig port failed to build after 312b4440bf.
Now that SSHServer sets us in the user's home directory, there is no
need to block them as they will resolve correctly according to the spec:
"File names starting with a slash are "absolute", and are relative to
the root of the file system. Names starting with any other character
are relative to the user's default directory (home directory)."
Also note that we were only refusing relative paths in the OPEN command,
but STAT was already accepting them (and resolving them incorrectly).
We were already changing the home directory for interactive shells, but
with this change single commands also get executed from the user's home
and SFTP relative paths will also resolve from the correct directory.
(Relative paths are still not allowed in the SFTP layer, but everything
will fall in place once we remove that restriction.)
We now report the actual value instead of simply returning 0/-1. We're
now using the conventional representation for signal-terminated
processes and return an exit-status of 128 + signal number.
POSIX requires it to be defined in this header:
https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/termios.h.html
"The <termios.h> header shall define the winsize structure, [...]"
This unbreaks the readline port after 8e34c970b5, which made it
use tc{get,set}winsize() instead of the ioctl.
Previously, it failed to compile with a -Wincompatible-pointer-types
warning:
"expected 'struct winsize *' but argument is of type 'struct winsize *'"
ioctl() takes the argument as a vararg, so it didn't trigger this
warning.
Undefine