dev: Implement basic devctl

dev/char/chardev.c

@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: ISC
 
 #include <zinnia/chardev.h>
+#include <zinnia/devctl.h>
 
 void chardev_init(
     struct chardev* dev,
@@ -55,9 +56,12 @@ errno_t devtmpfs_add_chardev(const char* name, struct chardev* dev, mode_t mode)
     struct vfs_path root = devtmpfs_root();
     errno_t status = vfs_mknod(root, root, name, mode, &target, ident_kernel(), nullptr);
     vfs_path_drop(root);
-    if (status)
+    if (status) {
         chardev_unref(dev);
-    return status;
+        return status;
+    }
+    devctl_notify_create(name);
+    return 0;
 }
 
 errno_t devtmpfs_mkdir(const char* name, mode_t mode) {
@@ -71,7 +75,10 @@ errno_t devtmpfs_remove(const char* name) {
     struct vfs_path root = devtmpfs_root();
     errno_t status = vfs_unlink(root, root, name, ident_kernel());
     vfs_path_drop(root);
-    return status;
+    if (status)
+        return status;
+    devctl_notify_destroy(name);
+    return 0;
 }
 
 errno_t devtmpfs_symlink(const char* name, const char* target) {