src/basic/cgroup-util.h

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 #pragma once
   3
   4 #include <dirent.h>
   5 #include <stdbool.h>
   6 #include <stdint.h>
   7 #include <stdio.h>
   8 #include <sys/statfs.h>
   9 #include <sys/types.h>
  10
  11 #include "def.h"
  12 #include "set.h"
  13
  14 #define SYSTEMD_CGROUP_CONTROLLER_LEGACY "name=systemd"
  15 #define SYSTEMD_CGROUP_CONTROLLER_HYBRID "name=unified"
  16 #define SYSTEMD_CGROUP_CONTROLLER "_systemd"
  17
  18 /* An enum of well known cgroup controllers */
  19 typedef enum CGroupController {
  20         /* Original cgroup controllers */
  21         CGROUP_CONTROLLER_CPU,
  22         CGROUP_CONTROLLER_CPUACCT,    /* v1 only */
  23         CGROUP_CONTROLLER_IO,         /* v2 only */
  24         CGROUP_CONTROLLER_BLKIO,      /* v1 only */
  25         CGROUP_CONTROLLER_MEMORY,
  26         CGROUP_CONTROLLER_DEVICES,    /* v1 only */
  27         CGROUP_CONTROLLER_PIDS,
  28
  29         /* BPF-based pseudo-controllers, v2 only */
  30         CGROUP_CONTROLLER_BPF_FIREWALL,
  31         CGROUP_CONTROLLER_BPF_DEVICES,
  32
  33         _CGROUP_CONTROLLER_MAX,
  34         _CGROUP_CONTROLLER_INVALID = -1,
  35 } CGroupController;
  36
  37 #define CGROUP_CONTROLLER_TO_MASK(c) (1U << (c))
  38
  39 /* A bit mask of well known cgroup controllers */
  40 typedef enum CGroupMask {
  41         CGROUP_MASK_CPU = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_CPU),
  42         CGROUP_MASK_CPUACCT = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_CPUACCT),
  43         CGROUP_MASK_IO = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_IO),
  44         CGROUP_MASK_BLKIO = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_BLKIO),
  45         CGROUP_MASK_MEMORY = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_MEMORY),
  46         CGROUP_MASK_DEVICES = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_DEVICES),
  47         CGROUP_MASK_PIDS = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_PIDS),
  48         CGROUP_MASK_BPF_FIREWALL = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_BPF_FIREWALL),
  49         CGROUP_MASK_BPF_DEVICES = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_BPF_DEVICES),
  50
  51         /* All real cgroupv1 controllers */
  52         CGROUP_MASK_V1 = CGROUP_MASK_CPU|CGROUP_MASK_CPUACCT|CGROUP_MASK_BLKIO|CGROUP_MASK_MEMORY|CGROUP_MASK_DEVICES|CGROUP_MASK_PIDS,
  53
  54         /* All real cgroupv2 controllers */
  55         CGROUP_MASK_V2 = CGROUP_MASK_CPU|CGROUP_MASK_IO|CGROUP_MASK_MEMORY|CGROUP_MASK_PIDS,
  56
  57         /* All cgroupv2 BPF pseudo-controllers */
  58         CGROUP_MASK_BPF = CGROUP_MASK_BPF_FIREWALL|CGROUP_MASK_BPF_DEVICES,
  59
  60         _CGROUP_MASK_ALL = CGROUP_CONTROLLER_TO_MASK(_CGROUP_CONTROLLER_MAX) - 1
  61 } CGroupMask;
  62
  63 static inline CGroupMask CGROUP_MASK_EXTEND_JOINED(CGroupMask mask) {
  64         /* We always mount "cpu" and "cpuacct" in the same hierarchy. Hence, when one bit is set also set the other */
  65
  66         if (mask & (CGROUP_MASK_CPU|CGROUP_MASK_CPUACCT))
  67                 mask |= (CGROUP_MASK_CPU|CGROUP_MASK_CPUACCT);
  68
  69         return mask;
  70 }
  71
  72 /* Special values for all weight knobs on unified hierarchy */
  73 #define CGROUP_WEIGHT_INVALID ((uint64_t) -1)
  74 #define CGROUP_WEIGHT_MIN UINT64_C(1)
  75 #define CGROUP_WEIGHT_MAX UINT64_C(10000)
  76 #define CGROUP_WEIGHT_DEFAULT UINT64_C(100)
  77
  78 #define CGROUP_LIMIT_MIN UINT64_C(0)
  79 #define CGROUP_LIMIT_MAX ((uint64_t) -1)
  80
  81 static inline bool CGROUP_WEIGHT_IS_OK(uint64_t x) {
  82         return
  83             x == CGROUP_WEIGHT_INVALID ||
  84             (x >= CGROUP_WEIGHT_MIN && x <= CGROUP_WEIGHT_MAX);
  85 }
  86
  87 /* IO limits on unified hierarchy */
  88 typedef enum CGroupIOLimitType {
  89         CGROUP_IO_RBPS_MAX,
  90         CGROUP_IO_WBPS_MAX,
  91         CGROUP_IO_RIOPS_MAX,
  92         CGROUP_IO_WIOPS_MAX,
  93
  94         _CGROUP_IO_LIMIT_TYPE_MAX,
  95         _CGROUP_IO_LIMIT_TYPE_INVALID = -1
  96 } CGroupIOLimitType;
  97
  98 extern const uint64_t cgroup_io_limit_defaults[_CGROUP_IO_LIMIT_TYPE_MAX];
  99
 100 const char* cgroup_io_limit_type_to_string(CGroupIOLimitType t) _const_;
 101 CGroupIOLimitType cgroup_io_limit_type_from_string(const char *s) _pure_;
 102
 103 /* Special values for the cpu.shares attribute */
 104 #define CGROUP_CPU_SHARES_INVALID ((uint64_t) -1)
 105 #define CGROUP_CPU_SHARES_MIN UINT64_C(2)
 106 #define CGROUP_CPU_SHARES_MAX UINT64_C(262144)
 107 #define CGROUP_CPU_SHARES_DEFAULT UINT64_C(1024)
 108
 109 static inline bool CGROUP_CPU_SHARES_IS_OK(uint64_t x) {
 110         return
 111             x == CGROUP_CPU_SHARES_INVALID ||
 112             (x >= CGROUP_CPU_SHARES_MIN && x <= CGROUP_CPU_SHARES_MAX);
 113 }
 114
 115 /* Special values for the blkio.weight attribute */
 116 #define CGROUP_BLKIO_WEIGHT_INVALID ((uint64_t) -1)
 117 #define CGROUP_BLKIO_WEIGHT_MIN UINT64_C(10)
 118 #define CGROUP_BLKIO_WEIGHT_MAX UINT64_C(1000)
 119 #define CGROUP_BLKIO_WEIGHT_DEFAULT UINT64_C(500)
 120
 121 static inline bool CGROUP_BLKIO_WEIGHT_IS_OK(uint64_t x) {
 122         return
 123             x == CGROUP_BLKIO_WEIGHT_INVALID ||
 124             (x >= CGROUP_BLKIO_WEIGHT_MIN && x <= CGROUP_BLKIO_WEIGHT_MAX);
 125 }
 126
 127 /* Default resource limits */
 128 #define DEFAULT_TASKS_MAX_PERCENTAGE            15U /* 15% of PIDs, 4915 on default settings */
 129 #define DEFAULT_USER_TASKS_MAX_PERCENTAGE       33U /* 33% of PIDs, 10813 on default settings */
 130
 131 typedef enum CGroupUnified {
 132         CGROUP_UNIFIED_UNKNOWN = -1,
 133         CGROUP_UNIFIED_NONE = 0,        /* Both systemd and controllers on legacy */
 134         CGROUP_UNIFIED_SYSTEMD = 1,     /* Only systemd on unified */
 135         CGROUP_UNIFIED_ALL = 2,         /* Both systemd and controllers on unified */
 136 } CGroupUnified;
 137
 138 /*
 139  * General rules:
 140  *
 141  * We accept named hierarchies in the syntax "foo" and "name=foo".
 142  *
 143  * We expect that named hierarchies do not conflict in name with a
 144  * kernel hierarchy, modulo the "name=" prefix.
 145  *
 146  * We always generate "normalized" controller names, i.e. without the
 147  * "name=" prefix.
 148  *
 149  * We require absolute cgroup paths. When returning, we will always
 150  * generate paths with multiple adjacent / removed.
 151  */
 152
 153 int cg_enumerate_processes(const char *controller, const char *path, FILE **_f);
 154 int cg_read_pid(FILE *f, pid_t *_pid);
 155 int cg_read_event(const char *controller, const char *path, const char *event,
 156                   char **val);
 157
 158 int cg_enumerate_subgroups(const char *controller, const char *path, DIR **_d);
 159 int cg_read_subgroup(DIR *d, char **fn);
 160
 161 typedef enum CGroupFlags {
 162         CGROUP_SIGCONT     = 1,
 163         CGROUP_IGNORE_SELF = 2,
 164         CGROUP_REMOVE      = 4,
 165 } CGroupFlags;
 166
 167 typedef void (*cg_kill_log_func_t)(pid_t pid, int sig, void *userdata);
 168
 169 int cg_kill(const char *controller, const char *path, int sig, CGroupFlags flags, Set *s, cg_kill_log_func_t kill_log, void *userdata);
 170 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);
 171
 172 int cg_migrate(const char *cfrom, const char *pfrom, const char *cto, const char *pto, CGroupFlags flags);
 173 int cg_migrate_recursive(const char *cfrom, const char *pfrom, const char *cto, const char *pto, CGroupFlags flags);
 174 int cg_migrate_recursive_fallback(const char *cfrom, const char *pfrom, const char *cto, const char *pto, CGroupFlags flags);
 175
 176 int cg_split_spec(const char *spec, char **controller, char **path);
 177 int cg_mangle_path(const char *path, char **result);
 178
 179 int cg_get_path(const char *controller, const char *path, const char *suffix, char **fs);
 180 int cg_get_path_and_check(const char *controller, const char *path, const char *suffix, char **fs);
 181
 182 int cg_pid_get_path(const char *controller, pid_t pid, char **path);
 183
 184 int cg_trim(const char *controller, const char *path, bool delete_root);
 185
 186 int cg_rmdir(const char *controller, const char *path);
 187
 188 int cg_create(const char *controller, const char *path);
 189 int cg_attach(const char *controller, const char *path, pid_t pid);
 190 int cg_attach_fallback(const char *controller, const char *path, pid_t pid);
 191 int cg_create_and_attach(const char *controller, const char *path, pid_t pid);
 192
 193 int cg_set_attribute(const char *controller, const char *path, const char *attribute, const char *value);
 194 int cg_get_attribute(const char *controller, const char *path, const char *attribute, char **ret);
 195 int cg_get_keyed_attribute(const char *controller, const char *path, const char *attribute, char **keys, char **values);
 196
 197 int cg_set_access(const char *controller, const char *path, uid_t uid, gid_t gid);
 198
 199 int cg_set_xattr(const char *controller, const char *path, const char *name, const void *value, size_t size, int flags);
 200 int cg_get_xattr(const char *controller, const char *path, const char *name, void *value, size_t size);
 201
 202 int cg_install_release_agent(const char *controller, const char *agent);
 203 int cg_uninstall_release_agent(const char *controller);
 204
 205 int cg_is_empty(const char *controller, const char *path);
 206 int cg_is_empty_recursive(const char *controller, const char *path);
 207
 208 int cg_get_root_path(char **path);
 209
 210 int cg_path_get_session(const char *path, char **session);
 211 int cg_path_get_owner_uid(const char *path, uid_t *uid);
 212 int cg_path_get_unit(const char *path, char **unit);
 213 int cg_path_get_user_unit(const char *path, char **unit);
 214 int cg_path_get_machine_name(const char *path, char **machine);
 215 int cg_path_get_slice(const char *path, char **slice);
 216 int cg_path_get_user_slice(const char *path, char **slice);
 217
 218 int cg_shift_path(const char *cgroup, const char *cached_root, const char **shifted);
 219 int cg_pid_get_path_shifted(pid_t pid, const char *cached_root, char **cgroup);
 220
 221 int cg_pid_get_session(pid_t pid, char **session);
 222 int cg_pid_get_owner_uid(pid_t pid, uid_t *uid);
 223 int cg_pid_get_unit(pid_t pid, char **unit);
 224 int cg_pid_get_user_unit(pid_t pid, char **unit);
 225 int cg_pid_get_machine_name(pid_t pid, char **machine);
 226 int cg_pid_get_slice(pid_t pid, char **slice);
 227 int cg_pid_get_user_slice(pid_t pid, char **slice);
 228
 229 int cg_path_decode_unit(const char *cgroup, char **unit);
 230
 231 char *cg_escape(const char *p);
 232 char *cg_unescape(const char *p) _pure_;
 233
 234 bool cg_controller_is_valid(const char *p);
 235
 236 int cg_slice_to_path(const char *unit, char **ret);
 237
 238 typedef const char* (*cg_migrate_callback_t)(CGroupMask mask, void *userdata);
 239
 240 int cg_create_everywhere(CGroupMask supported, CGroupMask mask, const char *path);
 241 int cg_attach_everywhere(CGroupMask supported, const char *path, pid_t pid, cg_migrate_callback_t callback, void *userdata);
 242 int cg_attach_many_everywhere(CGroupMask supported, const char *path, Set* pids, cg_migrate_callback_t callback, void *userdata);
 243 int cg_migrate_everywhere(CGroupMask supported, const char *from, const char *to, cg_migrate_callback_t callback, void *userdata);
 244 int cg_trim_everywhere(CGroupMask supported, const char *path, bool delete_root);
 245 int cg_enable_everywhere(CGroupMask supported, CGroupMask mask, const char *p);
 246
 247 int cg_mask_supported(CGroupMask *ret);
 248 int cg_mask_from_string(const char *s, CGroupMask *ret);
 249 int cg_mask_to_string(CGroupMask mask, char **ret);
 250
 251 int cg_kernel_controllers(Set **controllers);
 252
 253 bool cg_ns_supported(void);
 254
 255 int cg_all_unified(void);
 256 int cg_hybrid_unified(void);
 257 int cg_unified_controller(const char *controller);
 258 int cg_unified_flush(void);
 259
 260 bool cg_is_unified_wanted(void);
 261 bool cg_is_legacy_wanted(void);
 262 bool cg_is_hybrid_wanted(void);
 263
 264 const char* cgroup_controller_to_string(CGroupController c) _const_;
 265 CGroupController cgroup_controller_from_string(const char *s) _pure_;
 266
 267 int cg_weight_parse(const char *s, uint64_t *ret);
 268 int cg_cpu_shares_parse(const char *s, uint64_t *ret);
 269 int cg_blkio_weight_parse(const char *s, uint64_t *ret);
 270
 271 bool is_cgroup_fs(const struct statfs *s);
 272 bool fd_is_cgroup_fs(int fd);