sys.c

   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 file contains all the conditionally compiled bits that pull
  25   in the various operating-system specific modules
  26   */
  27
  28 #include "config.h"
  29
  30 #include "sysincl.h"
  31
  32 #include "sys.h"
  33 #include "sys_null.h"
  34 #include "logging.h"
  35
  36 #if defined(LINUX)
  37 #include "sys_linux.h"
  38 #include "sys_posix.h"
  39 #elif defined(SOLARIS)
  40 #include "sys_solaris.h"
  41 #include "sys_posix.h"
  42 #elif defined(NETBSD) || defined(FREEBSD)
  43 #include "sys_netbsd.h"
  44 #include "sys_posix.h"
  45 #elif defined(MACOSX)
  46 #include "sys_macosx.h"
  47 #endif
  48
  49 /* ================================================== */
  50
  51 static int null_driver;
  52
  53 /* ================================================== */
  54
  55 void
  56 SYS_Initialise(int clock_control)
  57 {
  58   null_driver = !clock_control;
  59   if (null_driver) {
  60     SYS_Null_Initialise();
  61     return;
  62   }
  63 #if defined(LINUX)
  64   SYS_Linux_Initialise();
  65 #elif defined(SOLARIS)
  66   SYS_Solaris_Initialise();
  67 #elif defined(NETBSD) || defined(FREEBSD)
  68   SYS_NetBSD_Initialise();
  69 #elif defined(MACOSX)
  70   SYS_MacOSX_Initialise();
  71 #else
  72 #error Unknown system
  73 #endif
  74 }
  75
  76 /* ================================================== */
  77
  78 void
  79 SYS_Finalise(void)
  80 {
  81   if (null_driver) {
  82     SYS_Null_Finalise();
  83     return;
  84   }
  85 #if defined(LINUX)
  86   SYS_Linux_Finalise();
  87 #elif defined(SOLARIS)
  88   SYS_Solaris_Finalise();
  89 #elif defined(NETBSD) || defined(FREEBSD)
  90   SYS_NetBSD_Finalise();
  91 #elif defined(MACOSX)
  92   SYS_MacOSX_Finalise();
  93 #else
  94 #error Unknown system
  95 #endif
  96 }
  97
  98 /* ================================================== */
  99
 100 void SYS_DropRoot(uid_t uid, gid_t gid)
 101 {
 102 #if defined(LINUX) && defined (FEAT_PRIVDROP)
 103   SYS_Linux_DropRoot(uid, gid, !null_driver);
 104 #elif defined(SOLARIS) && defined(FEAT_PRIVDROP)
 105   SYS_Solaris_DropRoot(uid, gid);
 106 #elif (defined(NETBSD) || defined(FREEBSD)) && defined(FEAT_PRIVDROP)
 107   SYS_NetBSD_DropRoot(uid, gid);
 108 #elif defined(MACOSX) && defined(FEAT_PRIVDROP)
 109   SYS_MacOSX_DropRoot(uid, gid);
 110 #else
 111   LOG_FATAL("dropping root privileges not supported");
 112 #endif
 113 }
 114
 115 /* ================================================== */
 116
 117 void SYS_EnableSystemCallFilter(int level, SYS_SystemCallContext context)
 118 {
 119 #if defined(LINUX) && defined(FEAT_SCFILTER)
 120   SYS_Linux_EnableSystemCallFilter(level, context);
 121 #else
 122   LOG_FATAL("system call filter not supported");
 123 #endif
 124 }
 125
 126 /* ================================================== */
 127
 128 void SYS_SetScheduler(int SchedPriority)
 129 {
 130 #if defined(MACOSX)
 131   SYS_MacOSX_SetScheduler(SchedPriority);
 132 #elif defined(HAVE_PTHREAD_SETSCHEDPARAM)
 133   SYS_Posix_SetScheduler(SchedPriority);
 134 #else
 135   LOG_FATAL("scheduler priority setting not supported");
 136 #endif
 137 }
 138
 139 /* ================================================== */
 140
 141 void SYS_LockMemory(void)
 142 {
 143 #if defined(HAVE_MLOCKALL)
 144   SYS_Posix_MemLockAll();
 145 #else
 146   LOG_FATAL("memory locking not supported");
 147 #endif
 148 }
 149
 150 /* ================================================== */