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use crate::io;
use core::mem::MaybeUninit;
use windows_sys::Win32::Networking::WinSock::{WSACleanup, WSAData, WSAGetLastError, WSAStartup};
/// `WSAStartup()`—Initialize process-wide Windows support for sockets.
///
/// On Windows, it's necessary to initialize the sockets subsystem before
/// using sockets APIs. The function performs the necessary initialization.
///
/// # References
/// - [Winsock2]
///
/// [Winsock2]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-wsastartup
pub fn wsa_startup() -> io::Result<WSAData> {
// Request version 2.2, which has been the latest version since far older
// versions of Windows than we support here. For more information about
// the version, see [here].
//
// [here]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-wsastartup#remarks
let version = 0x202;
let mut data = MaybeUninit::uninit();
unsafe {
let ret = WSAStartup(version, data.as_mut_ptr());
if ret == 0 {
Ok(data.assume_init())
} else {
Err(io::Errno::from_raw_os_error(WSAGetLastError()))
}
}
}
/// `WSACleanup()`—Clean up process-wide Windows support for sockets.
///
/// In a program where `init` is called, if sockets are no longer necessary,
/// this function releases associated resources.
///
/// # References
/// - [Winsock2]
///
/// [Winsock2]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-wsacleanup
pub fn wsa_cleanup() -> io::Result<()> {
unsafe {
if WSACleanup() == 0 {
Ok(())
} else {
Err(io::Errno::from_raw_os_error(WSAGetLastError()))
}
}
}
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