src/lxc/caps.h

   1 /*
   2  * lxc: linux Container library
   3  *
   4  * (C) Copyright IBM Corp. 2007, 2008
   5  *
   6  * Authors:
   7  * Daniel Lezcano <dlezcano at fr.ibm.com>
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  */
  23 #ifndef _caps_h
  24 #define _caps_h
  25
  26 extern int lxc_caps_reset(void);
  27 extern int lxc_caps_down(void);
  28 extern int lxc_caps_up(void);
  29 extern int lxc_caps_init(void);
  30 extern int lxc_caps_check(void);
  31
  32 extern int lxc_caps_last_cap(void);
  33
  34 #define lxc_priv(__lxc_function)                        \
  35         ({                                              \
  36                 int __ret, __ret2, __errno = 0;         \
  37                 __ret = lxc_caps_up();                  \
  38                 if (__ret)                              \
  39                         goto __out;                     \
  40                 __ret = __lxc_function;                 \
  41                 if (__ret)                              \
  42                         __errno = errno;                \
  43                 __ret2 = lxc_caps_down();               \
  44         __out:  __ret ? errno = __errno,__ret : __ret2; \
  45         })
  46
  47 #define lxc_unpriv(__lxc_function)              \
  48         ({                                              \
  49                 int __ret, __ret2, __errno = 0;         \
  50                 __ret = lxc_caps_down();                \
  51                 if (__ret)                              \
  52                         goto __out;                     \
  53                 __ret = __lxc_function;                 \
  54                 if (__ret)                              \
  55                         __errno = errno;                \
  56                 __ret2 = lxc_caps_up();                 \
  57         __out:  __ret ? errno = __errno,__ret : __ret2; \
  58         })
  59 #endif