1 /* SPDX-License-Identifier: LGPL-2.1+ */
8 #include <sys/statfs.h>
16 #define SYSTEMD_CGROUP_CONTROLLER_LEGACY "name=systemd"
17 #define SYSTEMD_CGROUP_CONTROLLER_HYBRID "name=unified"
18 #define SYSTEMD_CGROUP_CONTROLLER "_systemd"
20 /* An enum of well known cgroup controllers */
21 typedef enum CGroupController
{
22 CGROUP_CONTROLLER_CPU
,
23 CGROUP_CONTROLLER_CPUACCT
, /* v1 only */
24 CGROUP_CONTROLLER_IO
, /* v2 only */
25 CGROUP_CONTROLLER_BLKIO
, /* v1 only */
26 CGROUP_CONTROLLER_MEMORY
,
27 CGROUP_CONTROLLER_DEVICES
, /* v1 only */
28 CGROUP_CONTROLLER_PIDS
,
29 _CGROUP_CONTROLLER_MAX
,
30 _CGROUP_CONTROLLER_INVALID
= -1,
33 #define CGROUP_CONTROLLER_TO_MASK(c) (1 << (c))
35 /* A bit mask of well known cgroup controllers */
36 typedef enum CGroupMask
{
37 CGROUP_MASK_CPU
= CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_CPU
),
38 CGROUP_MASK_CPUACCT
= CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_CPUACCT
),
39 CGROUP_MASK_IO
= CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_IO
),
40 CGROUP_MASK_BLKIO
= CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_BLKIO
),
41 CGROUP_MASK_MEMORY
= CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_MEMORY
),
42 CGROUP_MASK_DEVICES
= CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_DEVICES
),
43 CGROUP_MASK_PIDS
= CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_PIDS
),
44 _CGROUP_MASK_ALL
= CGROUP_CONTROLLER_TO_MASK(_CGROUP_CONTROLLER_MAX
) - 1
47 /* Special values for all weight knobs on unified hierarchy */
48 #define CGROUP_WEIGHT_INVALID ((uint64_t) -1)
49 #define CGROUP_WEIGHT_MIN UINT64_C(1)
50 #define CGROUP_WEIGHT_MAX UINT64_C(10000)
51 #define CGROUP_WEIGHT_DEFAULT UINT64_C(100)
53 #define CGROUP_LIMIT_MIN UINT64_C(0)
54 #define CGROUP_LIMIT_MAX ((uint64_t) -1)
56 static inline bool CGROUP_WEIGHT_IS_OK(uint64_t x
) {
58 x
== CGROUP_WEIGHT_INVALID
||
59 (x
>= CGROUP_WEIGHT_MIN
&& x
<= CGROUP_WEIGHT_MAX
);
62 /* IO limits on unified hierarchy */
63 typedef enum CGroupIOLimitType
{
69 _CGROUP_IO_LIMIT_TYPE_MAX
,
70 _CGROUP_IO_LIMIT_TYPE_INVALID
= -1
73 extern const uint64_t cgroup_io_limit_defaults
[_CGROUP_IO_LIMIT_TYPE_MAX
];
75 const char* cgroup_io_limit_type_to_string(CGroupIOLimitType t
) _const_
;
76 CGroupIOLimitType
cgroup_io_limit_type_from_string(const char *s
) _pure_
;
78 /* Special values for the cpu.shares attribute */
79 #define CGROUP_CPU_SHARES_INVALID ((uint64_t) -1)
80 #define CGROUP_CPU_SHARES_MIN UINT64_C(2)
81 #define CGROUP_CPU_SHARES_MAX UINT64_C(262144)
82 #define CGROUP_CPU_SHARES_DEFAULT UINT64_C(1024)
84 static inline bool CGROUP_CPU_SHARES_IS_OK(uint64_t x
) {
86 x
== CGROUP_CPU_SHARES_INVALID
||
87 (x
>= CGROUP_CPU_SHARES_MIN
&& x
<= CGROUP_CPU_SHARES_MAX
);
90 /* Special values for the blkio.weight attribute */
91 #define CGROUP_BLKIO_WEIGHT_INVALID ((uint64_t) -1)
92 #define CGROUP_BLKIO_WEIGHT_MIN UINT64_C(10)
93 #define CGROUP_BLKIO_WEIGHT_MAX UINT64_C(1000)
94 #define CGROUP_BLKIO_WEIGHT_DEFAULT UINT64_C(500)
96 static inline bool CGROUP_BLKIO_WEIGHT_IS_OK(uint64_t x
) {
98 x
== CGROUP_BLKIO_WEIGHT_INVALID
||
99 (x
>= CGROUP_BLKIO_WEIGHT_MIN
&& x
<= CGROUP_BLKIO_WEIGHT_MAX
);
102 /* Default resource limits */
103 #define DEFAULT_TASKS_MAX_PERCENTAGE 15U /* 15% of PIDs, 4915 on default settings */
104 #define DEFAULT_USER_TASKS_MAX_PERCENTAGE 33U /* 33% of PIDs, 10813 on default settings */
106 typedef enum CGroupUnified
{
107 CGROUP_UNIFIED_UNKNOWN
= -1,
108 CGROUP_UNIFIED_NONE
= 0, /* Both systemd and controllers on legacy */
109 CGROUP_UNIFIED_SYSTEMD
= 1, /* Only systemd on unified */
110 CGROUP_UNIFIED_ALL
= 2, /* Both systemd and controllers on unified */
116 * We accept named hierarchies in the syntax "foo" and "name=foo".
118 * We expect that named hierarchies do not conflict in name with a
119 * kernel hierarchy, modulo the "name=" prefix.
121 * We always generate "normalized" controller names, i.e. without the
124 * We require absolute cgroup paths. When returning, we will always
125 * generate paths with multiple adjacent / removed.
128 int cg_enumerate_processes(const char *controller
, const char *path
, FILE **_f
);
129 int cg_read_pid(FILE *f
, pid_t
*_pid
);
130 int cg_read_event(const char *controller
, const char *path
, const char *event
,
133 int cg_enumerate_subgroups(const char *controller
, const char *path
, DIR **_d
);
134 int cg_read_subgroup(DIR *d
, char **fn
);
136 typedef enum CGroupFlags
{
138 CGROUP_IGNORE_SELF
= 2,
142 typedef void (*cg_kill_log_func_t
)(pid_t pid
, int sig
, void *userdata
);
144 int cg_kill(const char *controller
, const char *path
, int sig
, CGroupFlags flags
, Set
*s
, cg_kill_log_func_t kill_log
, void *userdata
);
145 int cg_kill_recursive(const char *controller
, const char *path
, int sig
, CGroupFlags flags
, Set
*s
, cg_kill_log_func_t kill_log
, void *userdata
);
147 int cg_migrate(const char *cfrom
, const char *pfrom
, const char *cto
, const char *pto
, CGroupFlags flags
);
148 int cg_migrate_recursive(const char *cfrom
, const char *pfrom
, const char *cto
, const char *pto
, CGroupFlags flags
);
149 int cg_migrate_recursive_fallback(const char *cfrom
, const char *pfrom
, const char *cto
, const char *pto
, CGroupFlags flags
);
151 int cg_split_spec(const char *spec
, char **controller
, char **path
);
152 int cg_mangle_path(const char *path
, char **result
);
154 int cg_get_path(const char *controller
, const char *path
, const char *suffix
, char **fs
);
155 int cg_get_path_and_check(const char *controller
, const char *path
, const char *suffix
, char **fs
);
157 int cg_pid_get_path(const char *controller
, pid_t pid
, char **path
);
159 int cg_trim(const char *controller
, const char *path
, bool delete_root
);
161 int cg_rmdir(const char *controller
, const char *path
);
163 int cg_create(const char *controller
, const char *path
);
164 int cg_attach(const char *controller
, const char *path
, pid_t pid
);
165 int cg_attach_fallback(const char *controller
, const char *path
, pid_t pid
);
166 int cg_create_and_attach(const char *controller
, const char *path
, pid_t pid
);
168 int cg_set_attribute(const char *controller
, const char *path
, const char *attribute
, const char *value
);
169 int cg_get_attribute(const char *controller
, const char *path
, const char *attribute
, char **ret
);
170 int cg_get_keyed_attribute(const char *controller
, const char *path
, const char *attribute
, char **keys
, char **values
);
172 int cg_set_access(const char *controller
, const char *path
, uid_t uid
, gid_t gid
);
174 int cg_set_xattr(const char *controller
, const char *path
, const char *name
, const void *value
, size_t size
, int flags
);
175 int cg_get_xattr(const char *controller
, const char *path
, const char *name
, void *value
, size_t size
);
177 int cg_install_release_agent(const char *controller
, const char *agent
);
178 int cg_uninstall_release_agent(const char *controller
);
180 int cg_is_empty(const char *controller
, const char *path
);
181 int cg_is_empty_recursive(const char *controller
, const char *path
);
183 int cg_get_root_path(char **path
);
185 int cg_path_get_session(const char *path
, char **session
);
186 int cg_path_get_owner_uid(const char *path
, uid_t
*uid
);
187 int cg_path_get_unit(const char *path
, char **unit
);
188 int cg_path_get_user_unit(const char *path
, char **unit
);
189 int cg_path_get_machine_name(const char *path
, char **machine
);
190 int cg_path_get_slice(const char *path
, char **slice
);
191 int cg_path_get_user_slice(const char *path
, char **slice
);
193 int cg_shift_path(const char *cgroup
, const char *cached_root
, const char **shifted
);
194 int cg_pid_get_path_shifted(pid_t pid
, const char *cached_root
, char **cgroup
);
196 int cg_pid_get_session(pid_t pid
, char **session
);
197 int cg_pid_get_owner_uid(pid_t pid
, uid_t
*uid
);
198 int cg_pid_get_unit(pid_t pid
, char **unit
);
199 int cg_pid_get_user_unit(pid_t pid
, char **unit
);
200 int cg_pid_get_machine_name(pid_t pid
, char **machine
);
201 int cg_pid_get_slice(pid_t pid
, char **slice
);
202 int cg_pid_get_user_slice(pid_t pid
, char **slice
);
204 int cg_path_decode_unit(const char *cgroup
, char **unit
);
206 char *cg_escape(const char *p
);
207 char *cg_unescape(const char *p
) _pure_
;
209 bool cg_controller_is_valid(const char *p
);
211 int cg_slice_to_path(const char *unit
, char **ret
);
213 typedef const char* (*cg_migrate_callback_t
)(CGroupMask mask
, void *userdata
);
215 int cg_create_everywhere(CGroupMask supported
, CGroupMask mask
, const char *path
);
216 int cg_attach_everywhere(CGroupMask supported
, const char *path
, pid_t pid
, cg_migrate_callback_t callback
, void *userdata
);
217 int cg_attach_many_everywhere(CGroupMask supported
, const char *path
, Set
* pids
, cg_migrate_callback_t callback
, void *userdata
);
218 int cg_migrate_everywhere(CGroupMask supported
, const char *from
, const char *to
, cg_migrate_callback_t callback
, void *userdata
);
219 int cg_trim_everywhere(CGroupMask supported
, const char *path
, bool delete_root
);
220 int cg_enable_everywhere(CGroupMask supported
, CGroupMask mask
, const char *p
);
222 int cg_mask_supported(CGroupMask
*ret
);
223 int cg_mask_from_string(const char *s
, CGroupMask
*ret
);
224 int cg_mask_to_string(CGroupMask mask
, char **ret
);
226 int cg_kernel_controllers(Set
**controllers
);
228 bool cg_ns_supported(void);
230 int cg_all_unified(void);
231 int cg_hybrid_unified(void);
232 int cg_unified_controller(const char *controller
);
233 int cg_unified_flush(void);
235 bool cg_is_unified_wanted(void);
236 bool cg_is_legacy_wanted(void);
237 bool cg_is_hybrid_wanted(void);
239 const char* cgroup_controller_to_string(CGroupController c
) _const_
;
240 CGroupController
cgroup_controller_from_string(const char *s
) _pure_
;
242 int cg_weight_parse(const char *s
, uint64_t *ret
);
243 int cg_cpu_shares_parse(const char *s
, uint64_t *ret
);
244 int cg_blkio_weight_parse(const char *s
, uint64_t *ret
);
246 bool is_cgroup_fs(const struct statfs
*s
);
247 bool fd_is_cgroup_fs(int fd
);