Give an actual name to MemoryIO on FreeBSD

dmoj/cptbox/utils.py

@@ -2,14 +2,17 @@
 import io
 import mmap
 import os
+from tempfile import mktemp
 from typing import Optional
 
 from dmoj.cptbox._cptbox import memory_fd_create, memory_fd_seal
+from dmoj.cptbox.tracer import FREEBSD
 
 
 class MemoryIO(io.FileIO):
     def __init__(self, prefill: Optional[bytes] = None, seal=False) -> None:
         super().__init__(memory_fd_create(), 'r+')
+        self._name = None
         if prefill:
             self.write(prefill)
         if seal:
@@ -32,8 +35,28 @@ def seal(self) -> None:
         finally:
             os.close(new_fd)
 
+    def close(self) -> None:
+        super().close()
+        if self._name:
+            os.unlink(self._name)
+
     def to_path(self) -> str:
-        return f'/proc/{os.getpid()}/fd/{self.fileno()}'
+        if not FREEBSD:
+            return f'/proc/{os.getpid()}/fd/{self.fileno()}'
+
+        if self._name:
+            return self._name
+
+        while True:
+            name = mktemp()
+            try:
+                os.link(f'/dev/fd/{self.fileno()}', name, follow_symlinks=True)
+            except OSError as e:
+                if e.errno != errno.EEXIST:
+                    raise
+            else:
+                self._name = name
+                return name
 
     def to_bytes(self) -> bytes:
         try: