xorg-x11-server/U_xwayland-Allow-passing-a-fd.patch

From 7ad1d0d384085fb480e00547c22a3e8a14b514ea Mon Sep 17 00:00:00 2001
From: Carlos Garnacho <carlosg@gnome.org>
Date: Sat, 20 Jul 2019 00:16:43 +0200
Subject: [PATCH] xwayland: Allow passing a fd for set up clients
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This FD also triggers the "wait for WM_S0" paths, so that the
compositor may set up a "maintenance line" for Xwayland, for
services that are essential to run before any client (eg. xrdb).
Those services would use this FD, disguised as an extra display
connection.

This -initfd can be seen as a generalization of -wm, a Wayland
compositor may use -initfd to launch its WM and any other clients
that should start up, or it may use -wm as a dedicated connection for
the WM and optionally use -initfd for the misc. startup clients.

If either of -wm or -initfd is passed, Xwayland will expect a selection
notification on WM_S0 before incorporating the FDs in -listen to the
poll list.

Also, correct a minor typo in the listenfd argument output,
give → given.

Signed-off-by: Carlos Garnacho <carlosg@gnome.org>
---
 hw/xwayland/xwayland.c | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/hw/xwayland/xwayland.c b/hw/xwayland/xwayland.c
index 111d4fafd..3983a114c 100644
--- orig-xorg-server-1.20.5/hw/xwayland/xwayland.c	2019-05-30 20:27:34.000000000 +0200
+++ xorg-server-1.20.5/hw/xwayland/xwayland.c	2019-09-16 17:26:47.771777034 +0200
@@ -95,7 +95,8 @@
 {
     ErrorF("-rootless              run rootless, requires wm support\n");
     ErrorF("-wm fd                 create X client for wm on given fd\n");
-    ErrorF("-listen fd             add give fd as a listen socket\n");
+    ErrorF("-initfd fd             add given fd as a listen socket for initialization clients\n");
+    ErrorF("-listenfd fd           add given fd as a listen socket\n");
     ErrorF("-eglstream             use eglstream backend for nvidia GPUs\n");
 }
 
+static int init_fd = -1;
 static int wm_fd = -1;
 static int listen_fds[5] = { -1, -1, -1, -1, -1 };
 static int listen_fd_count = 0;
@@ -148,6 +150,11 @@ ddxProcessArgument(int argc, char *argv[], int i)
         wm_fd = atoi(argv[i + 1]);
         return 2;
     }
+    else if (strcmp(argv[i], "-initfd") == 0) {
+        CHECK_FOR_REQUIRED_ARGUMENTS(1);
+        init_fd = atoi(argv[i + 1]);
+        return 2;
+    }
     else if (strcmp(argv[i], "-shm") == 0) {
         return 1;
     }
@@ -1287,10 +1294,14 @@ InitOutput(ScreenInfo * screen_info, int argc, char **argv)
 
     LocalAccessScopeUser();
 
-    if (wm_fd >= 0) {
-        TimerSet(NULL, 0, 1, add_client_fd, NULL);
+    if (wm_fd >= 0 || init_fd >= 0) {
+        if (wm_fd >= 0)
+            TimerSet(NULL, 0, 1, add_client_fd, NULL);
+        if (init_fd >= 0)
+            ListenOnOpenFD(init_fd, FALSE);
         AddCallback(&SelectionCallback, wm_selection_callback, NULL);
-    } else if (listen_fd_count > 0) {
+    }
+    else if (listen_fd_count > 0) {
         listen_on_fds();
     }
 }
-- 
2.22.0