util-vserver-0.30.208

[util-vserver.git] / lib_internal / switchtowatchxid.c

diff --git a/lib_internal/switchtowatchxid.c b/lib_internal/switchtowatchxid.c
new file mode 100644 (file)
index 0000000..b49305b
--- /dev/null
+++ b/lib_internal/switchtowatchxid.c
@@ -0,0 +1,58 @@
+// $Id: switchtowatchxid.c,v 1.4 2005/03/25 02:37:41 ensc Exp $    --*- c -*--
+
+// Copyright (C) 2004 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
+//  
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; version 2 of the License.
+//  
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//  
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include <vserver.h>
+#include <errno.h>
+#include <unistd.h>
+
+  // try to switch into context 1
+bool
+switchToWatchXid(char const **errptr)
+{
+#if 0
+#  warning Compiling in debug-code
+  return;
+#endif
+  if (vc_get_task_xid(0)==1) return true;
+
+  if (vc_isSupported(vcFEATURE_MIGRATE)) {
+    if (vc_ctx_migrate(1)==-1) {
+      if (errptr) *errptr = "vc_migrate_context()";
+      return false;
+    }
+  }
+  else {
+#if VC_ENABLE_API_COMPAT
+    if (vc_new_s_context(1,0,0)==VC_NOCTX) {
+      if (errptr) *errptr = "vc_new_s_context()";
+      return false;
+    }
+#else
+    if (errptr) *errptr = "can not change context: migrate kernel feature missing and 'compat' API disabled";
+    errno = ENOSYS;
+    return false;
+#endif
+  }
+
+  return true;
+}
+