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/* upstart
*
* cgroup.c - cgroup support.
*
* Copyright © 2013-2014 Canonical Ltd.
* Author: James Hunt <james.hunt@canonical.com>.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2, as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef INIT_CGROUP_H
#define INIT_CGROUP_H
#include <nih/hash.h>
#include <json.h>
/**
* DBUS_PATH_CGMANAGER:
*
* D-Bus object path the cgroup manager is available on.
**/
#ifndef DBUS_PATH_CGMANAGER
#define DBUS_PATH_CGMANAGER "/org/linuxcontainers/cgmanager"
#endif
/**
* UPSTART_CGROUP_ROOT:
*
* Name of root cgroup.
**/
#define UPSTART_CGROUP_ROOT "/"
/**
* UPSTART_CGROUP_ENVVAR:
*
* Name of special variable that may be specified within a cgroup stanza
* and which expands to a job-unique cgroup path.
**/
#define UPSTART_CGROUP_ENVVAR "UPSTART_CGROUP"
/**
* UPSTART_CGROUP_SHELL_ENVVAR:
*
* Value of UPSTART_CGROUP_ENVVAR with leading dollar.
**/
#define UPSTART_CGROUP_SHELL_ENVVAR "$" UPSTART_CGROUP_ENVVAR
/**
* CGroupSetting:
*
* Representation of a control group setting.
*
* Control groups are implemented as directories created under a
* special sysfs sub-directory mount. These directories contain files
* created by the kernel. Some of these files represent tunables
* such that values written into them modify the behaviour of the parent
* cgroup. A CGroupSetting represents the meta-data to be written to
* such a tunable cgroup file.
*
* @entry: list header,
* @key: setting to change,
* @value: value of @key.
**/
typedef struct cgroup_setting {
NihList entry;
char *key;
char *value;
} CGroupSetting;
/**
* CGroupName:
*
* @entry: list header,
* @name: name of cgroup,
* @expanded: value of @name where all variables have been expanded
* (or NULL if expanded value is the same as @name),
* @settings: list of CGroupSettings.
*
* Representation of a control group name.
*
* Note: @name is in fact a relative path fragment which can optionally
* contain embedded variables which will be expanded and which will be created
* below the appropriate cgroup controller.
**/
typedef struct cgroup_name {
NihList entry;
char *name;
char *expanded;
NihList settings;
} CGroupName;
/**
* CGroup:
*
* @entry: list header,
* @controller: cgroup controller name,
* @names: list of CGroupName objects.
*
* Representation of a control group.
*
* Note: @cgroups must contain atleast one entry since a control group
* is represented by its controlling subsystem and a name.
**/
typedef struct cgroup {
NihList entry;
char *controller;
NihList names;
} CGroup;
NIH_BEGIN_EXTERN
void cgroup_init (void);
int cgroup_support_enabled (void)
__attribute__ ((warn_unused_result));
CGroupName *cgroup_name_new (void *parent, const char *name)
__attribute__ ((warn_unused_result));
json_object *cgroup_name_serialise (CGroupName *name)
__attribute__ ((warn_unused_result));
json_object *cgroup_name_serialise_all (NihList *names)
__attribute__ ((warn_unused_result));
CGroupName *cgroup_name_deserialise (void *parent, json_object *json)
__attribute__ ((warn_unused_result));
int cgroup_name_deserialise_all (void *parent,
NihList *list,
json_object *json)
__attribute__ ((warn_unused_result));
json_object *cgroup_serialise (CGroup *group)
__attribute__ ((warn_unused_result));
json_object *cgroup_serialise_all (NihList *cgroups)
__attribute__ ((warn_unused_result));
CGroup *cgroup_deserialise (void *parent, json_object *json)
__attribute__ ((warn_unused_result));
int cgroup_deserialise_all (void *parent,
NihList *list,
json_object *json)
__attribute__ ((warn_unused_result));
CGroupSetting *cgroup_setting_new (void *parent,
const char *key, const char *value)
__attribute__ ((warn_unused_result));
CGroup *cgroup_new (void *parent, const char *controller)
__attribute__ ((warn_unused_result));
int cgroup_manager_set_address (const char *address)
__attribute__ ((warn_unused_result));
int cgroup_manager_connect (void)
__attribute__ ((warn_unused_result));
int cgroup_manager_available (void)
__attribute__ ((warn_unused_result));
int cgroup_clear (NihList *cgroups);
int cgroup_setup (NihList *cgroups, char * const *env,
uid_t uid, gid_t gid)
__attribute__ ((warn_unused_result));
int cgroup_chown (const char *controller,
const char *path,
uid_t uid, gid_t gid)
__attribute__ ((warn_unused_result));
json_object *cgroup_manager_serialise (void)
__attribute__ ((warn_unused_result));
int cgroup_manager_deserialise (json_object *json)
__attribute__ ((warn_unused_result));
json_object *cgroup_serialise_all (NihList *cgroups)
__attribute__ ((warn_unused_result));
json_object *cgroup_setting_serialise (const CGroupSetting *setting)
__attribute__ ((warn_unused_result));
json_object *cgroup_setting_serialise_all (NihList *settings)
__attribute__ ((warn_unused_result));
CGroupSetting *cgroup_setting_deserialise (void *parent,
json_object *json)
__attribute__ ((warn_unused_result));
int cgroup_setting_deserialise_all (void *parent, NihList *list,
json_object *json)
__attribute__ ((warn_unused_result));
int cgroup_add (void *parent, NihList *list, const char *controller,
const char *name, const char *key, const char *value)
__attribute__ ((warn_unused_result));
int cgroup_create (const char *controller, const char *path)
__attribute__ ((warn_unused_result));
int cgroup_enter (const char *controller, const char *path, pid_t pid)
__attribute__ ((warn_unused_result));
int cgroup_enter_groups (NihList *cgroups)
__attribute__ ((warn_unused_result));
int cgroup_settings_apply (const char *controller,
const char *path, NihList *settings)
__attribute__ ((warn_unused_result));
NIH_END_EXTERN
#endif /* INIT_CGROUP_H */
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