ioctl: add support for cygwin

https://github.com/msys2/msys2-runtime/blob/msys2-3.6.5/winsup/cygwin/include/sys/ioctl.h

Author: 500-internal-server-error

src/sys/ioctl/linux.rs

@@ -4,6 +4,7 @@ use cfg_if::cfg_if;
 #[cfg(any(
     target_os = "android",
     target_os = "fuchsia",
+    target_os = "cygwin",
     target_env = "musl",
     target_env = "ohos"
 ))]
@@ -12,12 +13,17 @@ pub type ioctl_num_type = ::libc::c_int;
 #[cfg(not(any(
     target_os = "android",
     target_os = "fuchsia",
+    target_os = "cygwin",
     target_env = "musl",
     target_env = "ohos"
 )))]
 #[doc(hidden)]
 pub type ioctl_num_type = ::libc::c_ulong;
 /// The datatype used for the 3rd argument
+#[cfg(target_os = "cygwin")]
+#[doc(hidden)]
+pub type ioctl_num_type = ::libc::c_int;
+#[cfg(not(target_os = "cygwin"))]
 #[doc(hidden)]
 pub type ioctl_param_type = ::libc::c_ulong;
 

src/sys/ioctl/mod.rs

@@ -227,11 +227,11 @@
 //! ```
 use cfg_if::cfg_if;
 
-#[cfg(any(linux_android, target_os = "fuchsia", target_os = "redox"))]
+#[cfg(any(linux_android, target_os = "fuchsia", target_os = "redox", target_os = "cygwin"))]
 #[macro_use]
 mod linux;
 
-#[cfg(any(linux_android, target_os = "fuchsia", target_os = "redox"))]
+#[cfg(any(linux_android, target_os = "fuchsia", target_os = "redox", target_os = "cygwin"))]
 pub use self::linux::*;
 
 #[cfg(any(bsd, solarish, target_os = "haiku",))]

src/sys/mod.rs

@@ -40,6 +40,7 @@ feature! {
     solarish,
     target_os = "fuchsia",
     target_os = "redox",
+    target_os = "cygwin",
 ))]
 #[cfg(feature = "ioctl")]
 #[cfg_attr(docsrs, doc(cfg(feature = "ioctl")))]