render/dmabuf: add wlr_dmabuf_attributes_copy

include/wlr/render/dmabuf.h

@@ -9,6 +9,7 @@
 #ifndef WLR_RENDER_DMABUF_H
 #define WLR_RENDER_DMABUF_H
 
+#include <stdbool.h>
 #include <stdint.h>
 
 #define WLR_DMABUF_MAX_PLANES 4
@@ -35,5 +36,10 @@ struct wlr_dmabuf_attributes {
  * Closes all file descriptors in the DMA-BUF attributes.
  */
 void wlr_dmabuf_attributes_finish(struct wlr_dmabuf_attributes *attribs);
+/**
+ * Clones the DMA-BUF attributes.
+ */
+bool wlr_dmabuf_attributes_copy(struct wlr_dmabuf_attributes *dst,
+	struct wlr_dmabuf_attributes *src);
 
 #endif

render/dmabuf.c

@@ -1,10 +1,28 @@
+#define _POSIX_C_SOURCE 200809L
+#include <fcntl.h>
 #include <unistd.h>
 #include <wlr/render/dmabuf.h>
+#include <wlr/util/log.h>
 
-void wlr_dmabuf_attributes_finish( struct wlr_dmabuf_attributes *attribs) {
+void wlr_dmabuf_attributes_finish(struct wlr_dmabuf_attributes *attribs) {
 	for (int i = 0; i < attribs->n_planes; ++i) {
 		close(attribs->fd[i]);
 		attribs->fd[i] = -1;
 	}
 	attribs->n_planes = 0;
 }
+
+bool wlr_dmabuf_attributes_copy(struct wlr_dmabuf_attributes *dst,
+		struct wlr_dmabuf_attributes *src) {
+	memcpy(dst, src, sizeof(struct wlr_dmabuf_attributes));
+
+	for (int i = 0; i < src->n_planes; ++i) {
+		dst->fd[i] = fcntl(src->fd[i], F_DUPFD_CLOEXEC, 0);
+		if (dst->fd[i] < 0) {
+			wlr_log_errno(WLR_ERROR, "fcntl(F_DUPFD_CLOEXEC) failed");
+			return false;
+		}
+	}
+
+	return true;
+}