From 669b941256fbf4c5acaf4d7a2f3ce07c66e0496c Mon Sep 17 00:00:00 2001
From: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date: Sat, 3 Dec 2022 19:31:59 +0100
Subject: mach-defpager: Mark as essential

So we get to know why the system gets stuck if mach-defpager happens to
die.
---
 mach-defpager/main.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'mach-defpager/main.c')

diff --git a/mach-defpager/main.c b/mach-defpager/main.c
index 0e42040b..69f83a58 100644
--- a/mach-defpager/main.c
+++ b/mach-defpager/main.c
@@ -42,6 +42,7 @@
 #include <hurd.h>
 #include <hurd/port.h>
 #include <hurd/fd.h>
+#include <hurd/paths.h>
 /* XXX */
 
 #include "default_pager.h"
@@ -141,6 +142,18 @@ main (int argc, char **argv)
 
   mach_port_deallocate (mach_task_self (), proc);
 
+  /* Mark us as essential.  */
+  mach_port_t startup;
+  startup = file_name_lookup (_SERVERS_STARTUP, 0, 0);
+  if (startup == MACH_PORT_NULL)
+    error (0, errno, "WARNING: Cannot register as essential task\n");
+
+  startup_essential_task (startup, mach_task_self (), MACH_PORT_NULL,
+			  program_invocation_short_name,
+			  bootstrap_master_host_port);
+
+  mach_port_deallocate (mach_task_self (), startup);
+
   printf_init(bootstrap_master_device_port);
 
   /*
-- 
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