Correct the third argument to ioctl on appropriate platforms.

While usually `ioctl()` passes a pointer, the function call has been
overloaded to allow integers to be passed. For some platforms this
is an `int` and on others it's a `ulong`.

src/sys/ioctl/bsd.rs

@@ -1,6 +1,9 @@
 /// The datatype used for the ioctl number
 #[doc(hidden)]
 pub type ioctl_num_type = ::libc::c_ulong;
+/// The datatype used for the 3rd argument
+#[doc(hidden)]
+pub type ioctl_param_type = ::libc::c_int;
 
 mod consts {
     use ::sys::ioctl::ioctl_num_type;

src/sys/ioctl/linux.rs

@@ -1,10 +1,9 @@
 /// The datatype used for the ioctl number
-#[cfg(any(target_os = "android", target_env = "musl"))]
 #[doc(hidden)]
 pub type ioctl_num_type = ::libc::c_int;
-#[cfg(not(any(target_os = "android", target_env = "musl")))]
+/// The datatype used for the 3rd argument
 #[doc(hidden)]
-pub type ioctl_num_type = ::libc::c_ulong;
+pub type ioctl_param_type = ::libc::c_ulong;
 
 #[doc(hidden)]
 pub const NRBITS: ioctl_num_type = 8;

src/sys/ioctl/mod.rs

@@ -541,7 +541,7 @@ cfg_if!{
             ($(#[$attr:meta])* $name:ident, $ioty:expr, $nr:expr) => (
                 $(#[$attr])*
                 pub unsafe fn $name(fd: $crate::libc::c_int,
-                                    data: $crate::libc::c_int)
+                                    data: $crate::sys::ioctl::ioctl_param_type)
                                     -> $crate::Result<$crate::libc::c_int> {
                     convert_ioctl_res!($crate::libc::ioctl(fd, request_code_write_int!($ioty, $nr) as $crate::sys::ioctl::ioctl_num_type, data))
                 }
@@ -578,7 +578,7 @@ cfg_if!{
             ($(#[$attr:meta])* $name:ident, $ioty:expr, $nr:expr) => (
                 $(#[$attr])*
                 pub unsafe fn $name(fd: $crate::libc::c_int,
-                                    data: $crate::libc::c_int)
+                                    data: $crate::sys::ioctl::ioctl_param_type)
                                     -> $crate::Result<$crate::libc::c_int> {
                     convert_ioctl_res!($crate::libc::ioctl(fd, request_code_write!($ioty, $nr, ::std::mem::size_of::<$crate::libc::c_int>()) as $crate::sys::ioctl::ioctl_num_type, data))
                 }