some semblance of socket support

src/boxext.rs

@@ -0,0 +1,27 @@
+use std::{ffi::OsStr, path::Path, ptr};
+
+/// Until [`Box::map()`] is stable, there's no way to do this that is safe, stable, and
+/// allocationless.
+pub trait BoxedPathExt {
+    fn into_boxed_os_str(self) -> Box<OsStr>;
+}
+
+impl BoxedPathExt for Box<Path> {
+    fn into_boxed_os_str(self) -> Box<OsStr> {
+        let path_mut_ptr: *mut Path = Box::into_raw(self);
+
+        // SAFETY: we just got `path_mut_ptr` from a valid Box.
+        let os_str_mut_ptr: *mut OsStr = unsafe {
+            let os_str_mut_ref = path_mut_ptr
+                .as_mut()
+                .expect("avoided undefined behavior")
+                .as_mut_os_str();
+
+            ptr::from_mut(os_str_mut_ref)
+        };
+
+        // SAFETY: allocation came from `Box::into_raw()`, and we are not extending
+        // its lifetime. There are also no shared or exclusive references.
+        unsafe { Box::<OsStr>::from_raw(os_str_mut_ptr) }
+    }
+}