[gtk/wip/otte/for-master] broadway: fix texture upload

[Benjamin Otte <otte src gnome org>]

commit 9962ef9ac44a405df17d73bf959be73076e5603d
Author: Benjamin Otte <otte redhat com>
Date:   Thu Oct 28 14:48:20 2021 +0200

    broadway: fix texture upload
    
    This was carelessly broken by me in 5b473911.
    
    While fixing it anyway, at some support for better error handling.
    
    Fixes #4381

 gdk/broadway/gdkbroadway-server.c | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)
---
diff --git a/gdk/broadway/gdkbroadway-server.c b/gdk/broadway/gdkbroadway-server.c
index 4ce17727cd..bd221f5442 100644
--- a/gdk/broadway/gdkbroadway-server.c
+++ b/gdk/broadway/gdkbroadway-server.c
@@ -620,21 +620,28 @@ gdk_broadway_server_upload_texture (GdkBroadwayServer *server,
   gsize size;
   int fd;
 
-  id = server->next_texture_id++;
-
   bytes = gdk_texture_save_to_png_bytes (texture);
   fd = open_shared_memory ();
   data = g_bytes_get_data (bytes, &size);
 
-  while (size)
+  id = server->next_texture_id++;
+
+  msg.id = id;
+  msg.offset = 0;
+  msg.size = 0;
+
+  while (msg.size < size)
     {
-      gssize ret = write (fd, data, size);
+      gssize ret = write (fd, data + msg.size, size - msg.size);
 
       if (ret <= 0)
-        break;
+        {
+          if (errno == EINTR)
+            continue;
+          break;
+        }
 
-      size -= ret;
-      data += ret;
+      msg.size += ret;
     }
 
   g_bytes_unref (bytes);