Update *_badfd methods in the adapter to return an errno (#7672)

Makes them a bit more consistent with the rest of the WASI functions as
opposed to returning a boolean.

crates/test-programs/src/bin/preview2_adapter_badfd.rs

@@ -2,15 +2,15 @@ fn main() {
     #[link(wasm_import_module = "wasi_snapshot_preview1")]
     extern "C" {
         #[cfg_attr(target_arch = "wasm32", link_name = "adapter_open_badfd")]
-        fn adapter_open_badfd(fd: *mut u32) -> bool;
+        fn adapter_open_badfd(fd: *mut u32) -> wasi::Errno;
 
         #[cfg_attr(target_arch = "wasm32", link_name = "adapter_close_badfd")]
-        fn adapter_close_badfd(fd: u32) -> bool;
+        fn adapter_close_badfd(fd: u32) -> wasi::Errno;
     }
 
     unsafe {
         let mut fd = 0;
-        assert!(adapter_open_badfd(&mut fd));
+        assert_eq!(adapter_open_badfd(&mut fd), wasi::ERRNO_SUCCESS);
 
         assert_eq!(wasi::fd_close(fd), Err(wasi::ERRNO_BADF));
 
@@ -41,6 +41,6 @@ fn main() {
             Err(wasi::ERRNO_BADF)
         );
 
-        assert!(adapter_close_badfd(fd));
+        assert_eq!(adapter_close_badfd(fd), wasi::ERRNO_SUCCESS);
     }
 }

crates/wasi-preview1-component-adapter/src/lib.rs

@@ -152,17 +152,17 @@ impl<T, E> TrappingUnwrap<T> for Result<T, E> {
 /// from WASI Preview 1 to Preview 2.  It will use this function to reserve
 /// descriptors for its own use, valid only for use with libc functions.
 #[no_mangle]
-pub unsafe extern "C" fn adapter_open_badfd(fd: *mut u32) -> bool {
+pub unsafe extern "C" fn adapter_open_badfd(fd: *mut u32) -> Errno {
     State::with(|state| {
         *fd = state.descriptors_mut().open(Descriptor::Bad)?;
         Ok(())
-    }) == wasi::ERRNO_SUCCESS
+    })
 }
 
 /// Close a descriptor previously opened using `adapter_open_badfd`.
 #[no_mangle]
-pub unsafe extern "C" fn adapter_close_badfd(fd: u32) -> bool {
-    State::with(|state| state.descriptors_mut().close(fd)) == wasi::ERRNO_SUCCESS
+pub unsafe extern "C" fn adapter_close_badfd(fd: u32) -> Errno {
+    State::with(|state| state.descriptors_mut().close(fd))
 }
 
 #[no_mangle]