msgq on macOS (#36958)

* msgq on macOS

* clean that up

common/prefix.h

@@ -13,7 +13,11 @@ public:
     if (prefix.empty()) {
       prefix = util::random_string(15);
     }
-    msgq_path = Path::shm_path() + "/msgq_" + prefix;
+#ifdef __APPLE__
+    msgq_path = "/tmp/msgq_" + prefix;
+#else
+    msgq_path = "/dev/shm/msgq_" + prefix;
+#endif
     bool ret = util::create_directories(msgq_path, 0777);
     assert(ret);
     setenv("OPENPILOT_PREFIX", prefix.c_str(), 1);

common/prefix.py

@@ -1,4 +1,5 @@
 import os
+import platform
 import shutil
 import uuid
 
@@ -11,7 +12,8 @@ from openpilot.system.hardware.hw import DEFAULT_DOWNLOAD_CACHE_ROOT
 class OpenpilotPrefix:
   def __init__(self, prefix: str = None, create_dirs_on_enter: bool = True, clean_dirs_on_exit: bool = True, shared_download_cache: bool = False):
     self.prefix = prefix if prefix else str(uuid.uuid4().hex[0:15])
-    self.msgq_path = os.path.join(Paths.shm_path(), "msgq_" + self.prefix)
+    shm_path = "/tmp" if platform.system() == "Darwin" else "/dev/shm"
+    self.msgq_path = os.path.join(shm_path, "msgq_" + self.prefix)
     self.create_dirs_on_enter = create_dirs_on_enter
     self.clean_dirs_on_exit = clean_dirs_on_exit
     self.shared_download_cache = shared_download_cache