switchtowatchxid.c (1570B)
1 // $Id$ --*- c -*-- 2 3 // Copyright (C) 2004 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de> 4 // 5 // This program is free software; you can redistribute it and/or modify 6 // it under the terms of the GNU General Public License as published by 7 // the Free Software Foundation; version 2 of the License. 8 // 9 // This program is distributed in the hope that it will be useful, 10 // but WITHOUT ANY WARRANTY; without even the implied warranty of 11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 // GNU General Public License for more details. 13 // 14 // You should have received a copy of the GNU General Public License 15 // along with this program; if not, write to the Free Software 16 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 17 18 19 #ifdef HAVE_CONFIG_H 20 # include <config.h> 21 #endif 22 23 #include <vserver.h> 24 #include <errno.h> 25 #include <unistd.h> 26 27 // try to switch into context 1 28 bool 29 switchToWatchXid(char const **errptr) 30 { 31 #if 0 32 # warning Compiling in debug-code 33 return; 34 #endif 35 if (vc_get_task_xid(0)==1) return true; 36 37 if (vc_isSupported(vcFEATURE_MIGRATE)) { 38 if (vc_ctx_migrate(1, 0)==-1) { 39 if (errptr) *errptr = "vc_migrate_context()"; 40 return false; 41 } 42 } 43 else { 44 #if VC_ENABLE_API_COMPAT 45 if (vc_new_s_context(1,0,0)==VC_NOCTX) { 46 if (errptr) *errptr = "vc_new_s_context()"; 47 return false; 48 } 49 #else 50 if (errptr) *errptr = "can not change context: migrate kernel feature missing and 'compat' API disabled"; 51 errno = ENOSYS; 52 return false; 53 #endif 54 } 55 56 return true; 57 } 58