src/shared/apparmor-util.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2013 Lennart Poettering
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd 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   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <stddef.h>
  21
  22 #include "alloc-util.h"
  23 #include "apparmor-util.h"
  24 #include "fileio.h"
  25 #include "parse-util.h"
  26
  27 bool mac_apparmor_use(void) {
  28         static int cached_use = -1;
  29
  30         if (cached_use < 0) {
  31                 _cleanup_free_ char *p = NULL;
  32
  33                 cached_use =
  34                         read_one_line_file("/sys/module/apparmor/parameters/enabled", &p) >= 0 &&
  35                         parse_boolean(p) > 0;
  36         }
  37
  38         return cached_use;
  39 }