sys.h

   1 /*
   2   chronyd/chronyc - Programs for keeping computer clocks accurate.
   3
   4  **********************************************************************
   5  * Copyright (C) Richard P. Curnow  1997-2002
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of version 2 of the GNU General Public License as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  19  *
  20  **********************************************************************
  21
  22   =======================================================================
  23
  24   This is the header for the file that links in the operating system-
  25   specific parts of the software
  26
  27 */
  28
  29 #ifndef GOT_SYS_H
  30 #define GOT_SYS_H
  31
  32 /* Called at the start of the run to do initialisation */
  33 extern void SYS_Initialise(int clock_control);
  34
  35 /* Called at the end of the run to do final clean-up */
  36 extern void SYS_Finalise(void);
  37
  38 typedef enum {
  39   SYS_MAIN_PROCESS,
  40   SYS_NTSKE_HELPER,
  41 } SYS_ProcessContext;
  42
  43 /* Switch to the specified user and group in given context */
  44 extern void SYS_DropRoot(uid_t uid, gid_t gid, SYS_ProcessContext context);
  45
  46 /* Enable a system call filter to allow only system calls
  47    which chronyd normally needs after initialization */
  48 extern void SYS_EnableSystemCallFilter(int level, SYS_ProcessContext context);
  49
  50 extern void SYS_SetScheduler(int SchedPriority);
  51 extern void SYS_LockMemory(void);
  52
  53 #endif /* GOT_SYS_H */