fd-tracker: refactor: extract fs_handle interface from fd_tracker

[lttng-tools.git] / src / common / fs-handle-internal.h

diff --git a/src/common/fs-handle-internal.h b/src/common/fs-handle-internal.h
new file mode 100644 (file)
index 0000000..0fe3f8c
--- /dev/null
+++ b/src/common/fs-handle-internal.h
@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2020 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by the
+ * Free Software Foundation; version 2.1 of the License.
+ *
+ * This library is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
+ */
+
+#ifndef FS_HANDLE_INTERNAL_H
+#define FS_HANDLE_INTERNAL_H
+
+struct fs_handle;
+
+/*
+ * Multiple internal APIs return fs_handles. For the moment, this internal
+ * interface allows the use of different fs_handle implementations in different
+ * daemons. For instance, the trace chunk interface returns fs_handles that
+ * behave diffently depending on whether or not the trace chunk was configured
+ * to use an fd-tracker.
+ */
+
+typedef int (*fs_handle_get_fd_cb)(struct fs_handle *);
+typedef void (*fs_handle_put_fd_cb)(struct fs_handle *);
+typedef int (*fs_handle_unlink_cb)(struct fs_handle *);
+typedef int (*fs_handle_close_cb)(struct fs_handle *);
+
+struct fs_handle {
+       fs_handle_get_fd_cb get_fd;
+       fs_handle_put_fd_cb put_fd;
+       fs_handle_unlink_cb unlink;
+       fs_handle_close_cb close;
+};
+
+#endif /* FS_HANDLE_INTERNAL_H */