From 0f7feef5c7b52187cdb6a33062927bcdd2ae20ae Mon Sep 17 00:00:00 2001
From: Joe Bryan <joemfb@gmail.com>
Date: Thu, 3 Nov 2022 20:44:58 -0400
Subject: [PATCH] vere: adds --no-demand argument to disable demand paging

---
 pkg/urbit/daemon/main.c       | 20 ++++++++++++++++++++
 pkg/urbit/include/vere/vere.h |  1 +
 2 files changed, 21 insertions(+)

diff --git a/pkg/urbit/daemon/main.c b/pkg/urbit/daemon/main.c
index 486e496745..b9151f9570 100644
--- a/pkg/urbit/daemon/main.c
+++ b/pkg/urbit/daemon/main.c
@@ -153,6 +153,15 @@ _main_init(void)
   //
   u3_Host.ops_u.has = c3y;
 
+  //  demand paging (ie, file-backed mapping for the loom)
+  //  is not yet supported on windows
+  //
+#ifdef U3_OS_mingw
+  u3_Host.ops_u.map = c3n;
+#else
+  u3_Host.ops_u.map = c3y;
+#endif
+
   u3_Host.ops_u.net = c3y;
   u3_Host.ops_u.lit = c3n;
   u3_Host.ops_u.nuu = c3n;
@@ -246,6 +255,7 @@ _main_getopt(c3_i argc, c3_c** argv)
     { "scry-format",         required_argument, NULL, 'Z' },
     //
     { "urth-loom",           required_argument, NULL, 5 },
+    { "no-demand",           no_argument,       NULL, 6 },
     //
     { NULL, 0, NULL, 0 },
   };
@@ -266,6 +276,10 @@ _main_getopt(c3_i argc, c3_c** argv)
         u3_Host.ops_u.lut_y = lut_w;
         break;
       }
+      case 6: {  //  no-demand
+        u3_Host.ops_u.map = c3n;
+        break;
+      }
       case 'X': {
         u3_Host.ops_u.pek_c = strdup(optarg);
         break;
@@ -2146,6 +2160,12 @@ main(c3_i   argc,
         u3C.wag_w |= u3o_debug_ram;
       }
 
+      /*  Set no-demand flag.
+      */
+      if ( !_(u3_Host.ops_u.map) ) {
+        u3C.wag_w |= u3o_no_demand;
+      }
+
       /*  Set profile flag.
       */
       if ( _(u3_Host.ops_u.pro) ) {
diff --git a/pkg/urbit/include/vere/vere.h b/pkg/urbit/include/vere/vere.h
index f02bf4a46d..dd505d085c 100644
--- a/pkg/urbit/include/vere/vere.h
+++ b/pkg/urbit/include/vere/vere.h
@@ -313,6 +313,7 @@
         c3_c*   puf_c;                      //  -Z, scry result format
         c3_o    con;                        //      run conn
         c3_o    doc;                        //      dock binary in pier
+        c3_o    map;                        //  --no-demand (reversed)
       } u3_opts;
 
     /* u3_host: entire host.