The current spanZ() function will not scan for a 0 terminator if the
type is not 0 terminated. This encourages using 0 terminated array
types to bind C arrays which hold 0 terminated strings. However, this is
a big footgun as nothing in the C type system guarantees there to be a
0 terminator at the end of the array and if there is none this becomes
Illegal Behavior in Zig.
To solve this, deprecate spanZ() and lenZ(), adding a new sliceTo()
function that always scans for the given terminator even if the type is
not sentinel terminated.
Currently zig will always try to build its own libc and compile against
that. This of course makes sense for cross-compilation, but can cause
problems when targeting the native OS/ABI.
For example, if the system uses a newer glibc version than zig ships
zig will fall back to using the newest version it does ship. However
this causes linking system libraries to fail as they are built against a
different glibc version than the zig code is built against.
To remedy this, simply default to linking the system libc when targeting
the native OS/ABI.
It turns out that nothing in the test suite was exercising
preadv/pwritev and so the previous commits silently broke them.
Adding tests revealed readvAll and preadvAll were also broken and not
covered by any test.
While musl decided to hard-wire off_t to a 64bit quantity, glibc is much
older and defaults to 32bit offsets and offers some -64 suffixed
versions of I/O functions.
There's a weird mix-up of types: sometimes off_t is used, sometimes not,
sometimes it's defined as a signed quantity and sometimes as an unsigned
one, but we'll sort this problem later.
Implement loading Winsock extensions.
Add missing Winsock extension GUID's.
Implement readVectorized() for POSIX sockets and
readVectorized() / writeVectorized() for Windows
sockets.
Inverse how mixins are used to implement platform-independent syscalls
for the std.x.os.Socket abstraction. This cleans up the API as suggested
by @komuw.
Add missing constants to ws2_32 such as SIO_BASE_HANDLE.
Made all declared constants in ws2_32 comptime_int, and fixed a few
broken constants (i.e. GUID's).
Fixed a few syscalls not having callconv(WINAPI) in ws2_32.
Fixed a typo in std.x.net.tcp.Client.
Removed unnecessary @alignCast's for socket addresses in
std.x.net.Socket.
Added a warning on using timeout methods for std.x.net.Socket.
Fixed compilation error spotted by CI in std.os that references
std.os.windows.ws2_32.SD_RECEIVE.
Renamed std.x.os.Socket.setOption()'s parameter `name: u32` to `code:
u32`.
