1 files changed, 32 insertions, 13 deletions
diff --git a/lib/std/os.zig b/lib/std/os.zig
index be1fe3e5f4..7967811672 100644
--- a/lib/std/os.zig
+++ b/lib/std/os.zig
@@ -5378,22 +5378,41 @@ pub const SetSockOptError = error{
 
     /// Insufficient resources are available in the system to complete the call.
     SystemResources,
+
+    NetworkSubsystemFailed,
+    FileDescriptorNotASocket,
+    SocketNotBound,
 } || UnexpectedError;
 
 /// Set a socket's options.
-pub fn setsockopt(fd: fd_t, level: u32, optname: u32, opt: []const u8) SetSockOptError!void {
-    switch (errno(system.setsockopt(fd, level, optname, opt.ptr, @intCast(socklen_t, opt.len)))) {
-        0 => {},
-        EBADF => unreachable, // always a race condition
-        ENOTSOCK => unreachable, // always a race condition
-        EINVAL => unreachable,
-        EFAULT => unreachable,
-        EDOM => return error.TimeoutTooBig,
-        EISCONN => return error.AlreadyConnected,
-        ENOPROTOOPT => return error.InvalidProtocolOption,
-        ENOMEM => return error.SystemResources,
-        ENOBUFS => return error.SystemResources,
-        else => |err| return unexpectedErrno(err),
+pub fn setsockopt(fd: socket_t, level: u32, optname: u32, opt: []const u8) SetSockOptError!void {
+    if (builtin.os.tag == .windows) {
+        const rc = windows.ws2_32.setsockopt(fd, level, optname, opt.ptr, @intCast(socklen_t, opt.len));
+        if (rc == windows.ws2_32.SOCKET_ERROR) {
+            switch (windows.ws2_32.WSAGetLastError()) {
+                .WSANOTINITIALISED => unreachable,
+                .WSAENETDOWN => return error.NetworkSubsystemFailed,
+                .WSAEFAULT => unreachable,
+                .WSAENOTSOCK => return error.FileDescriptorNotASocket,
+                .WSAEINVAL => return error.SocketNotBound,
+                else => |err| return windows.unexpectedWSAError(err),
+            }
+        }
+        return;
+    } else {
+        switch (errno(system.setsockopt(fd, level, optname, opt.ptr, @intCast(socklen_t, opt.len)))) {
+            0 => {},
+            EBADF => unreachable, // always a race condition
+            ENOTSOCK => unreachable, // always a race condition
+            EINVAL => unreachable,
+            EFAULT => unreachable,
+            EDOM => return error.TimeoutTooBig,
+            EISCONN => return error.AlreadyConnected,
+            ENOPROTOOPT => return error.InvalidProtocolOption,
+            ENOMEM => return error.SystemResources,
+            ENOBUFS => return error.SystemResources,
+            else => |err| return unexpectedErrno(err),
+        }
     }
 }