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Use Bool (1 byte) for IPV6_V6ONLY on Windows #593

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Use Bool (1 byte) for IPV6_V6ONLY on Windows #593

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2 changes: 1 addition & 1 deletion src/socket.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1935,7 +1935,7 @@ impl Socket {
/// [`set_only_v6`]: Socket::set_only_v6
pub fn only_v6(&self) -> io::Result<bool> {
unsafe {
getsockopt::<c_int>(self.as_raw(), sys::IPPROTO_IPV6, sys::IPV6_V6ONLY)
getsockopt::<Bool>(self.as_raw(), sys::IPPROTO_IPV6, sys::IPV6_V6ONLY)
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According to the docs it's a DWORD that only takes the values 0 or 1.

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@Thomasdezeeuw Thomasdezeeuw Jul 3, 2025 •
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The Windows docs are wrong a couple of places. For example for TCP_NODELAY, it says it's "DWORD (Boolean)", source: https://learn.microsoft.com/en-us/windows/win32/winsock/ipproto-tcp-socket-options. But it's actually a 1 byte boolean:

socket2/src/socket.rs

Line 2237 in 10e7cfd

getsockopt::<Bool>(self.as_raw(), sys::IPPROTO_TCP, sys::TCP_NODELAY)

socket2/src/sys/windows.rs

Line 97 in 10e7cfd

pub(crate) type Bool = windows_sys::Win32::Foundation::BOOLEAN;

https://docs.rs/windows-sys/0.59.0/windows_sys/Win32/Foundation/type.BOOLEAN.html

In this case, I think it's actually correct though and it's the 4 byte boolean version (https://docs.rs/windows-sys/0.59.0/windows_sys/Win32/Foundation/type.BOOL.html, yup we have BOOLEAN and BOOL and they're different types 🙂)

.map(|only_v6| only_v6 != 0)
}
}
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