--- /dev/null
+/*
+ * Copyright (C) 2020 Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ *
+ * SPDX-License-Identifier: LGPL-2.1-only
+ *
+ */
+
+#include <unistd.h>
+#include <urcu/ref.h>
+
+#include "fd-handle.h"
+#include <common/error.h>
+
+struct fd_handle {
+ struct urcu_ref ref;
+ int fd;
+};
+
+static void fd_handle_release(struct urcu_ref *ref)
+{
+ int ret;
+ struct fd_handle *handle = container_of(ref, struct fd_handle, ref);
+
+ LTTNG_ASSERT(handle->fd >= 0);
+ ret = close(handle->fd);
+ if (ret == -1) {
+ PERROR("Failed to close file descriptor of fd_handle upon release: fd = %d",
+ handle->fd);
+ }
+
+ free(handle);
+}
+
+struct fd_handle *fd_handle_create(int fd)
+{
+ struct fd_handle *handle = NULL;
+
+ if (fd < 0) {
+ ERR("Attempted to create an fd_handle from an invalid file descriptor: fd = %d",
+ fd);
+ goto end;
+ }
+
+ handle = (fd_handle *) zmalloc(sizeof(*handle));
+ if (!handle) {
+ PERROR("Failed to allocate fd_handle");
+ goto end;
+ }
+
+ urcu_ref_init(&handle->ref);
+ handle->fd = fd;
+
+end:
+ return handle;
+}
+
+void fd_handle_get(struct fd_handle *handle)
+{
+ if (!handle) {
+ return;
+ }
+
+ urcu_ref_get(&handle->ref);
+}
+
+void fd_handle_put(struct fd_handle *handle)
+{
+ if (!handle) {
+ return;
+ }
+
+ urcu_ref_put(&handle->ref, fd_handle_release);
+}
+
+int fd_handle_get_fd(struct fd_handle *handle)
+{
+ LTTNG_ASSERT(handle);
+ return handle->fd;
+}
+
+struct fd_handle *fd_handle_copy(const struct fd_handle *handle)
+{
+ struct fd_handle *new_handle = NULL;
+ const int new_fd = dup(handle->fd);
+
+ if (new_fd < 0) {
+ PERROR("Failed to duplicate file descriptor while copying fd_handle: fd = %d", handle->fd);
+ goto end;
+ }
+
+ new_handle = fd_handle_create(new_fd);
+end:
+ return new_handle;
+}