ESP32: add support for "Platform Attachments"

This will allow to store miscellaneous information inside ESP32PlatformData sturct, so we don't need to add new fields or lists to it every time we add support to a new NIF. This change has been introduced to support tracking of mounted filesystem in order to allow umounting them using `esp:umount/1`. Signed-off-by: Davide Bettio <[email protected]>
atomvm · Sep 29, 2024 · 06370b6 · 06370b6
1 parent 389ec97
commit 06370b6
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diff --git a/src/platforms/esp32/components/avm_sys/include/esp32_sys.h b/src/platforms/esp32/components/avm_sys/include/esp32_sys.h
@@ -89,6 +89,16 @@ struct EventListener
     listener_event_t sender;
 };
 
+struct PlatformAttachment
+{
+    struct ListHead list_head;
+
+    // attachment_type must be unique for a certain type of entry.
+    // I suggest using a function pointer to the "constructor function" as a unique value since
+    // different functions have always different (and unique) addresses.
+    uintptr_t attachment_type;
+};
+
 struct ESP32PlatformData
 {
     pthread_t select_thread;
@@ -114,6 +124,8 @@ struct ESP32PlatformData
 #endif
     mbedtls_ctr_drbg_context random_ctx;
     bool random_is_initialized;
+
+    struct SyncList attachment_list;
 };
 
 typedef void (*port_driver_init_t)(GlobalContext *global);

diff --git a/src/platforms/esp32/components/avm_sys/sys.c b/src/platforms/esp32/components/avm_sys/sys.c
@@ -264,6 +264,8 @@ void sys_init_platform(GlobalContext *glb)
 
     platform->entropy_is_initialized = false;
     platform->random_is_initialized = false;
+
+    synclist_init(&platform->attachment_list);
 }
 
 void sys_free_platform(GlobalContext *glb)