diff --git a/photon/libc/sys/horizon/launch.c b/photon/libc/sys/horizon/launch.c
index fe36ec4..5c1ae8f 100644
--- a/photon/libc/sys/horizon/launch.c
+++ b/photon/libc/sys/horizon/launch.c
@@ -203,7 +203,7 @@ static int validate_ns(int flags, const struct namespace_entry *ns, size_t count
         return EFAULT;
     }
 
-    if ((flags & LAUNCH_INHERIT_NS) && count) {
+    if (!(flags & LAUNCH_SET_NS) && count) {
         /* TODO better error messages */
         set_error_msg("cannot create a new namespace and inherit an existing one");
         return EINVAL;
@@ -238,7 +238,7 @@ static int collect_names(const struct launch_info *info, struct launch_ctx *ctx)
     size_t ns_count = info->ns_count;
     const struct namespace_entry *ns = info->ns;
 
-    if (info->flags & LAUNCH_INHERIT_NS) {
+    if (!(info->flags & LAUNCH_SET_NS)) {
         ns_count = ctx->inherited_ns_len;
         ns = ctx->inherited_ns;
     }
@@ -278,7 +278,7 @@ static int count_handles(const struct launch_info *info, struct launch_ctx *ctx)
     const struct namespace_entry *ns = info->ns;
     bool auto_ns = false;
 
-    if (info->flags & LAUNCH_INHERIT_NS) {
+    if (!(info->flags & LAUNCH_SET_NS)) {
         ns_len = ctx->inherited_ns_len;
         ns = ctx->inherited_ns;
         auto_ns = true;
@@ -302,6 +302,9 @@ static int count_handles(const struct launch_info *info, struct launch_ctx *ctx)
          * all other handle types are used internally by launch() */
         case MX_B_TUNNEL_LDSVC:
         case MX_B_TUNNEL_EXPORT:
+        case MX_B_RESOURCE_ROOT:
+        case MX_B_RESOURCE_IOPORT:
+        case MX_B_RESOURCE_IRQ:
         case MX_B_USER0:
         case MX_B_USER1:
         case MX_B_USER2:
@@ -373,7 +376,7 @@ static int collect_handles(const struct launch_info *info, struct launch_ctx *ct
         ctx->stdio[i] = fd_handle;
     }
 
-    if (info->flags & LAUNCH_INHERIT_NS) {
+    if (!(info->flags & LAUNCH_SET_NS)) {
         for (size_t i = 0; i < ctx->inherited_ns_len; i++) {
             const struct namespace_entry *ent = &ctx->inherited_ns[i];
 
@@ -605,7 +608,7 @@ static void success_cleanup(struct launch_ctx *ctx)
 
 static int inherit_namespace(const struct launch_info *info, struct launch_ctx *ctx)
 {
-    if (!(info->flags & LAUNCH_INHERIT_NS)) {
+    if (info->flags & LAUNCH_SET_NS) {
         return 0;
     }
 
@@ -633,27 +636,6 @@ static mx_handle_t request_v1(mx_handle_t ldsvc, const char *name)
 
     mx_tunnel_write(ldsvc, msg_buf, msg_len, NULL, 0);
 
-#if 0
-    mx_signals_t sig = 0;
-    mx_status_t err = mx_object_wait(ldsvc,
-            MX_TUNNEL_READABLE | MX_TUNNEL_REMOTE_CLOSED,
-            mx_deadline_after(MX_SEC(3)), &sig);
-
-    if (sig & MX_TUNNEL_REMOTE_CLOSED) {
-        return MX_NULL_HANDLE;
-    }
-
-    if (err == MX_ERR_TIMED_OUT) {
-        return MX_NULL_HANDLE;
-    }
-
-    size_t nr_handles = 0;
-    mx_tunnel_read(ldsvc, NULL, 0, NULL, 0, &msg_len, &nr_handles);
-
-    unsigned char resp_buf[msg_len];
-    mx_handle_t handles[nr_handles];
-#endif
-
     mx_handle_t handle;
 
     mx_tunnel_read(ldsvc,
@@ -1091,20 +1073,31 @@ static int send_exec_bootstrap_message(const struct launch_info *args, struct la
      */
     int tmp = 0;
     default_handles[tmp++] = ARG_HANDLE(ctx->new_task,              MX_B_HND(MX_B_TASK_SELF,    0));
-    default_handles[tmp++] = ARG_HANDLE(vdso_vmo,                       MX_B_HND(MX_B_VMO_VDSO,     0));
+    default_handles[tmp++] = ARG_HANDLE(vdso_vmo,                   MX_B_HND(MX_B_VMO_VDSO,     0));
     default_handles[tmp++] = ARG_HANDLE(ctx->exec_vmo,              MX_B_HND(MX_B_VMO_EXEC,     0));
     default_handles[tmp++] = ARG_HANDLE(ctx->new_vmar,              MX_B_HND(MX_B_VMAR_ROOT,    0));
     default_handles[tmp++] = ARG_HANDLE(ctx->exec.remote_exec_vmar, MX_B_HND(MX_B_VMAR_EXEC,    0));
     default_handles[tmp++] = ARG_HANDLE(ctx->bootstrap_remote,      MX_B_HND(MX_B_TUNNEL_BTSTP, 0));
 
+    const char *default_argv[] = { args->path };
+    int default_argc = sizeof default_argv / sizeof *default_argv;
+
+    const char **argv = args->argv;
+    int argc = args->argc;
+
+    if (!argv) {
+        argv = default_argv;
+        argc = default_argc;
+    }
+
     mx_handle_t *raw_handles;
 
     size_t msg_len;
     mx_bootstrap_msg_t *msg = build_bootstrap_message(
-            args->argc,              args->argv,
+            argc,                    argv,
             0,                       NULL,
-            ctx->name_count,     ctx->names,
-            ctx->b_handle_count, ctx->b_handles,
+            ctx->name_count,         ctx->names,
+            ctx->b_handle_count,     ctx->b_handles,
             &msg_len,                &raw_handles);
 
     mx_tunnel_write_etc(ctx->bootstrap_local,
diff --git a/photon/libc/sys/horizon/sys/launch.h b/photon/libc/sys/horizon/sys/launch.h
index 5e56166..86d238a 100644
--- a/photon/libc/sys/horizon/sys/launch.h
+++ b/photon/libc/sys/horizon/sys/launch.h
@@ -13,9 +13,8 @@
 #define NS_ENTRY_PATH(p, s)   { .path = (p), .src = (s),  .fd = -1,  .handle = MX_NULL_HANDLE }
 
 enum launch_flags {
-    /* inherit parent task's namespace. if this flag is set,
-     * launch_info.ns must be NULL. */
-    LAUNCH_INHERIT_NS    = 0x01u,
+    /* don't inherit parent task's namespace. */
+    LAUNCH_SET_NS = 0x01u,
     /* use launch_info.fd as the new task's stdio file descriptors */
     LAUNCH_SET_FD = 0x02u,
 };