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// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//! C definitions used by libnative that don't belong in liblibc
#![allow(type_overflow)]
use libc;
pub static WSADESCRIPTION_LEN: uint = 256;
pub static WSASYS_STATUS_LEN: uint = 128;
pub static FIONBIO: libc::c_long = 0x8004667e;
static FD_SETSIZE: uint = 64;
pub static MSG_DONTWAIT: libc::c_int = 0;
#[repr(C)]
pub struct WSADATA {
pub wVersion: libc::WORD,
pub wHighVersion: libc::WORD,
pub szDescription: [u8, ..WSADESCRIPTION_LEN + 1],
pub szSystemStatus: [u8, ..WSASYS_STATUS_LEN + 1],
pub iMaxSockets: u16,
pub iMaxUdpDg: u16,
pub lpVendorInfo: *u8,
}
pub type LPWSADATA = *mut WSADATA;
#[repr(C)]
pub struct fd_set {
fd_count: libc::c_uint,
fd_array: [libc::SOCKET, ..FD_SETSIZE],
}
pub fn fd_set(set: &mut fd_set, s: libc::SOCKET) {
set.fd_array[set.fd_count as uint] = s;
set.fd_count += 1;
}
#[link(name = "ws2_32")]
extern "system" {
pub fn WSAStartup(wVersionRequested: libc::WORD,
lpWSAData: LPWSADATA) -> libc::c_int;
pub fn WSAGetLastError() -> libc::c_int;
pub fn ioctlsocket(s: libc::SOCKET, cmd: libc::c_long,
argp: *mut libc::c_ulong) -> libc::c_int;
pub fn select(nfds: libc::c_int,
readfds: *fd_set,
writefds: *fd_set,
exceptfds: *fd_set,
timeout: *libc::timeval) -> libc::c_int;
pub fn getsockopt(sockfd: libc::SOCKET,
level: libc::c_int,
optname: libc::c_int,
optval: *mut libc::c_char,
optlen: *mut libc::c_int) -> libc::c_int;
pub fn CancelIo(hFile: libc::HANDLE) -> libc::BOOL;
pub fn CancelIoEx(hFile: libc::HANDLE,
lpOverlapped: libc::LPOVERLAPPED) -> libc::BOOL;
}
pub mod compat {
use std::intrinsics::{atomic_store_relaxed, transmute};
use libc::types::os::arch::extra::{LPCWSTR, HMODULE, LPCSTR, LPVOID};
extern "system" {
fn GetModuleHandleW(lpModuleName: LPCWSTR) -> HMODULE;
fn GetProcAddress(hModule: HMODULE, lpProcName: LPCSTR) -> LPVOID;
}
// store_func() is idempotent, so using relaxed ordering for the atomics
// should be enough. This way, calling a function in this compatibility
// layer (after it's loaded) shouldn't be any slower than a regular DLL
// call.
unsafe fn store_func(ptr: *mut uint, module: &str, symbol: &str, fallback: uint) {
let module = module.to_utf16().append_one(0);
symbol.with_c_str(|symbol| {
let handle = GetModuleHandleW(module.as_ptr());
let func: uint = transmute(GetProcAddress(handle, symbol));
atomic_store_relaxed(ptr, if func == 0 {
fallback
} else {
func
})
})
}
/// Macro for creating a compatibility fallback for a Windows function
///
/// # Example
/// ```
/// compat_fn!(adll32::SomeFunctionW(_arg: LPCWSTR) {
/// // Fallback implementation
/// })
/// ```
///
/// Note that arguments unused by the fallback implementation should not be called `_` as
/// they are used to be passed to the real function if available.
macro_rules! compat_fn(
($module:ident::$symbol:ident($($argname:ident: $argtype:ty),*)
-> $rettype:ty $fallback:block) => (
#[inline(always)]
pub unsafe fn $symbol($($argname: $argtype),*) -> $rettype {
static mut ptr: extern "system" fn($($argname: $argtype),*) -> $rettype = thunk;
extern "system" fn thunk($($argname: $argtype),*) -> $rettype {
unsafe {
::io::c::compat::store_func(&mut ptr as *mut _ as *mut uint,
stringify!($module),
stringify!($symbol),
fallback as uint);
::std::intrinsics::atomic_load_relaxed(&ptr)($($argname),*)
}
}
extern "system" fn fallback($($argname: $argtype),*) -> $rettype $fallback
::std::intrinsics::atomic_load_relaxed(&ptr)($($argname),*)
}
);
($module:ident::$symbol:ident($($argname:ident: $argtype:ty),*) $fallback:block) => (
compat_fn!($module::$symbol($($argname: $argtype),*) -> () $fallback)
)
)
/// Compatibility layer for functions in `kernel32.dll`
///
/// Latest versions of Windows this is needed for:
///
/// * `CreateSymbolicLinkW`: Windows XP, Windows Server 2003
/// * `GetFinalPathNameByHandleW`: Windows XP, Windows Server 2003
pub mod kernel32 {
use libc::types::os::arch::extra::{DWORD, LPCWSTR, BOOLEAN, HANDLE};
use libc::consts::os::extra::ERROR_CALL_NOT_IMPLEMENTED;
extern "system" {
fn SetLastError(dwErrCode: DWORD);
}
compat_fn!(kernel32::CreateSymbolicLinkW(_lpSymlinkFileName: LPCWSTR,
_lpTargetFileName: LPCWSTR,
_dwFlags: DWORD) -> BOOLEAN {
unsafe { SetLastError(ERROR_CALL_NOT_IMPLEMENTED as DWORD); }
0
})
compat_fn!(kernel32::GetFinalPathNameByHandleW(_hFile: HANDLE,
_lpszFilePath: LPCWSTR,
_cchFilePath: DWORD,
_dwFlags: DWORD) -> DWORD {
unsafe { SetLastError(ERROR_CALL_NOT_IMPLEMENTED as DWORD); }
0
})
}
}
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