src/lxc/cgroups/cgroup.c

   1 /*
   2  * lxc: linux Container library
   3  *
   4  * (C) Copyright IBM Corp. 2007, 2008
   5  *
   6  * Authors:
   7  * Daniel Lezcano <daniel.lezcano at free.fr>
   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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  22  */
  23
  24 #ifndef _GNU_SOURCE
  25 #define _GNU_SOURCE 1
  26 #endif
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <sys/types.h>
  30 #include <unistd.h>
  31
  32 #include "cgroup.h"
  33 #include "conf.h"
  34 #include "config.h"
  35 #include "initutils.h"
  36 #include "log.h"
  37 #include "start.h"
  38
  39 lxc_log_define(cgroup, lxc);
  40
  41 extern struct cgroup_ops *cgfsng_ops_init(struct lxc_conf *conf);
  42
  43 struct cgroup_ops *cgroup_init(struct lxc_conf *conf)
  44 {
  45         struct cgroup_ops *cgroup_ops;
  46
  47         cgroup_ops = cgfsng_ops_init(conf);
  48         if (!cgroup_ops) {
  49                 ERROR("Failed to initialize cgroup driver");
  50                 return NULL;
  51         }
  52
  53         if (!cgroup_ops->data_init(cgroup_ops))
  54                 return NULL;
  55
  56         TRACE("Initialized cgroup driver %s", cgroup_ops->driver);
  57
  58         if (cgroup_ops->cgroup_layout == CGROUP_LAYOUT_LEGACY)
  59                 TRACE("Running with legacy cgroup layout");
  60         else if (cgroup_ops->cgroup_layout == CGROUP_LAYOUT_HYBRID)
  61                 TRACE("Running with hybrid cgroup layout");
  62         else if (cgroup_ops->cgroup_layout == CGROUP_LAYOUT_UNIFIED)
  63                 TRACE("Running with unified cgroup layout");
  64         else
  65                 WARN("Running with unknown cgroup layout");
  66
  67         return cgroup_ops;
  68 }
  69
  70 void cgroup_exit(struct cgroup_ops *ops)
  71 {
  72         char **cur;
  73         struct hierarchy **it;
  74
  75         if (!ops)
  76                 return;
  77
  78         for (cur = ops->cgroup_use; cur && *cur; cur++)
  79                 free(*cur);
  80
  81         free(ops->cgroup_pattern);
  82         free(ops->container_cgroup);
  83
  84         for (it = ops->hierarchies; it && *it; it++) {
  85                 char **p;
  86
  87                 for (p = (*it)->controllers; p && *p; p++)
  88                         free(*p);
  89                 free((*it)->controllers);
  90
  91                 for (p = (*it)->cgroup2_chown; p && *p; p++)
  92                         free(*p);
  93                 free((*it)->cgroup2_chown);
  94
  95                 free((*it)->mountpoint);
  96                 free((*it)->container_base_path);
  97                 free((*it)->container_full_path);
  98                 free((*it)->monitor_full_path);
  99                 free(*it);
 100         }
 101         free(ops->hierarchies);
 102
 103         free(ops);
 104
 105         return;
 106 }
 107
 108 #define INIT_SCOPE "/init.scope"
 109 void prune_init_scope(char *cg)
 110 {
 111         char *point;
 112
 113         if (!cg)
 114                 return;
 115
 116         point = cg + strlen(cg) - strlen(INIT_SCOPE);
 117         if (point < cg)
 118                 return;
 119
 120         if (strcmp(point, INIT_SCOPE) == 0) {
 121                 if (point == cg)
 122                         *(point + 1) = '\0';
 123                 else
 124                         *point = '\0';
 125         }
 126 }