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/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#pragma once
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#include <dirent.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <sys/statfs.h>
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#include <sys/types.h>
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#include "def.h"
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#include "set.h"
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#define SYSTEMD_CGROUP_CONTROLLER_LEGACY "name=systemd"
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#define SYSTEMD_CGROUP_CONTROLLER_HYBRID "name=unified"
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#define SYSTEMD_CGROUP_CONTROLLER "_systemd"
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/* An enum of well known cgroup controllers */
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typedef enum CGroupController {
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/* Original cgroup controllers */
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CGROUP_CONTROLLER_CPU,
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CGROUP_CONTROLLER_CPUACCT, /* v1 only */
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CGROUP_CONTROLLER_CPUSET, /* v2 only */
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CGROUP_CONTROLLER_IO, /* v2 only */
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CGROUP_CONTROLLER_BLKIO, /* v1 only */
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CGROUP_CONTROLLER_MEMORY,
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CGROUP_CONTROLLER_DEVICES, /* v1 only */
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CGROUP_CONTROLLER_PIDS,
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/* BPF-based pseudo-controllers, v2 only */
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CGROUP_CONTROLLER_BPF_FIREWALL,
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CGROUP_CONTROLLER_BPF_DEVICES,
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_CGROUP_CONTROLLER_MAX,
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_CGROUP_CONTROLLER_INVALID = -1,
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} CGroupController;
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#define CGROUP_CONTROLLER_TO_MASK(c) (1U << (c))
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/* A bit mask of well known cgroup controllers */
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typedef enum CGroupMask {
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CGROUP_MASK_CPU = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_CPU),
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CGROUP_MASK_CPUACCT = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_CPUACCT),
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CGROUP_MASK_CPUSET = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_CPUSET),
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CGROUP_MASK_IO = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_IO),
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CGROUP_MASK_BLKIO = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_BLKIO),
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CGROUP_MASK_MEMORY = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_MEMORY),
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CGROUP_MASK_DEVICES = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_DEVICES),
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CGROUP_MASK_PIDS = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_PIDS),
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CGROUP_MASK_BPF_FIREWALL = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_BPF_FIREWALL),
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CGROUP_MASK_BPF_DEVICES = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_BPF_DEVICES),
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/* All real cgroup v1 controllers */
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CGROUP_MASK_V1 = CGROUP_MASK_CPU|CGROUP_MASK_CPUACCT|CGROUP_MASK_BLKIO|CGROUP_MASK_MEMORY|CGROUP_MASK_DEVICES|CGROUP_MASK_PIDS,
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/* All real cgroup v2 controllers */
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CGROUP_MASK_V2 = CGROUP_MASK_CPU|CGROUP_MASK_CPUSET|CGROUP_MASK_IO|CGROUP_MASK_MEMORY|CGROUP_MASK_PIDS,
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/* All cgroup v2 BPF pseudo-controllers */
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CGROUP_MASK_BPF = CGROUP_MASK_BPF_FIREWALL|CGROUP_MASK_BPF_DEVICES,
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_CGROUP_MASK_ALL = CGROUP_CONTROLLER_TO_MASK(_CGROUP_CONTROLLER_MAX) - 1
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} CGroupMask;
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static inline CGroupMask CGROUP_MASK_EXTEND_JOINED(CGroupMask mask) {
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/* We always mount "cpu" and "cpuacct" in the same hierarchy. Hence, when one bit is set also set the other */
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if (mask & (CGROUP_MASK_CPU|CGROUP_MASK_CPUACCT))
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mask |= (CGROUP_MASK_CPU|CGROUP_MASK_CPUACCT);
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return mask;
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}
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CGroupMask get_cpu_accounting_mask(void);
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bool cpu_accounting_is_cheap(void);
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/* Special values for all weight knobs on unified hierarchy */
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#define CGROUP_WEIGHT_INVALID ((uint64_t) -1)
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#define CGROUP_WEIGHT_MIN UINT64_C(1)
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#define CGROUP_WEIGHT_MAX UINT64_C(10000)
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#define CGROUP_WEIGHT_DEFAULT UINT64_C(100)
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#define CGROUP_LIMIT_MIN UINT64_C(0)
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#define CGROUP_LIMIT_MAX ((uint64_t) -1)
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static inline bool CGROUP_WEIGHT_IS_OK(uint64_t x) {
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return
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x == CGROUP_WEIGHT_INVALID ||
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(x >= CGROUP_WEIGHT_MIN && x <= CGROUP_WEIGHT_MAX);
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}
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/* IO limits on unified hierarchy */
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typedef enum CGroupIOLimitType {
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CGROUP_IO_RBPS_MAX,
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CGROUP_IO_WBPS_MAX,
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CGROUP_IO_RIOPS_MAX,
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CGROUP_IO_WIOPS_MAX,
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_CGROUP_IO_LIMIT_TYPE_MAX,
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_CGROUP_IO_LIMIT_TYPE_INVALID = -1
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} CGroupIOLimitType;
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extern const uint64_t cgroup_io_limit_defaults[_CGROUP_IO_LIMIT_TYPE_MAX];
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const char* cgroup_io_limit_type_to_string(CGroupIOLimitType t) _const_;
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CGroupIOLimitType cgroup_io_limit_type_from_string(const char *s) _pure_;
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/* Special values for the cpu.shares attribute */
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#define CGROUP_CPU_SHARES_INVALID ((uint64_t) -1)
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#define CGROUP_CPU_SHARES_MIN UINT64_C(2)
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#define CGROUP_CPU_SHARES_MAX UINT64_C(262144)
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#define CGROUP_CPU_SHARES_DEFAULT UINT64_C(1024)
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static inline bool CGROUP_CPU_SHARES_IS_OK(uint64_t x) {
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return
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x == CGROUP_CPU_SHARES_INVALID ||
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(x >= CGROUP_CPU_SHARES_MIN && x <= CGROUP_CPU_SHARES_MAX);
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}
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/* Special values for the blkio.weight attribute */
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#define CGROUP_BLKIO_WEIGHT_INVALID ((uint64_t) -1)
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#define CGROUP_BLKIO_WEIGHT_MIN UINT64_C(10)
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#define CGROUP_BLKIO_WEIGHT_MAX UINT64_C(1000)
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#define CGROUP_BLKIO_WEIGHT_DEFAULT UINT64_C(500)
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static inline bool CGROUP_BLKIO_WEIGHT_IS_OK(uint64_t x) {
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return
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x == CGROUP_BLKIO_WEIGHT_INVALID ||
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(x >= CGROUP_BLKIO_WEIGHT_MIN && x <= CGROUP_BLKIO_WEIGHT_MAX);
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}
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typedef enum CGroupUnified {
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CGROUP_UNIFIED_UNKNOWN = -1,
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CGROUP_UNIFIED_NONE = 0, /* Both systemd and controllers on legacy */
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CGROUP_UNIFIED_SYSTEMD = 1, /* Only systemd on unified */
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CGROUP_UNIFIED_ALL = 2, /* Both systemd and controllers on unified */
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} CGroupUnified;
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/*
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* General rules:
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*
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* We accept named hierarchies in the syntax "foo" and "name=foo".
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*
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* We expect that named hierarchies do not conflict in name with a
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* kernel hierarchy, modulo the "name=" prefix.
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*
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* We always generate "normalized" controller names, i.e. without the
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* "name=" prefix.
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*
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* We require absolute cgroup paths. When returning, we will always
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* generate paths with multiple adjacent / removed.
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*/
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int cg_enumerate_processes(const char *controller, const char *path, FILE **_f);
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int cg_read_pid(FILE *f, pid_t *_pid);
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int cg_read_event(const char *controller, const char *path, const char *event,
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char **val);
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int cg_enumerate_subgroups(const char *controller, const char *path, DIR **_d);
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int cg_read_subgroup(DIR *d, char **fn);
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typedef enum CGroupFlags {
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CGROUP_SIGCONT = 1 << 0,
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CGROUP_IGNORE_SELF = 1 << 1,
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CGROUP_REMOVE = 1 << 2,
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} CGroupFlags;
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typedef int (*cg_kill_log_func_t)(pid_t pid, int sig, void *userdata);
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int cg_kill(const char *controller, const char *path, int sig, CGroupFlags flags, Set *s, cg_kill_log_func_t kill_log, void *userdata);
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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);
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int cg_split_spec(const char *spec, char **ret_controller, char **ret_path);
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int cg_mangle_path(const char *path, char **result);
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int cg_get_path(const char *controller, const char *path, const char *suffix, char **fs);
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int cg_get_path_and_check(const char *controller, const char *path, const char *suffix, char **fs);
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int cg_pid_get_path(const char *controller, pid_t pid, char **path);
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int cg_rmdir(const char *controller, const char *path);
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typedef enum {
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CG_KEY_MODE_GRACEFUL = 1 << 0,
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} CGroupKeyMode;
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int cg_set_attribute(const char *controller, const char *path, const char *attribute, const char *value);
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int cg_get_attribute(const char *controller, const char *path, const char *attribute, char **ret);
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int cg_get_keyed_attribute_full(const char *controller, const char *path, const char *attribute, char **keys, char **values, CGroupKeyMode mode);
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static inline int cg_get_keyed_attribute(
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const char *controller,
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const char *path,
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const char *attribute,
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char **keys,
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char **ret_values) {
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return cg_get_keyed_attribute_full(controller, path, attribute, keys, ret_values, 0);
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}
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static inline int cg_get_keyed_attribute_graceful(
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const char *controller,
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const char *path,
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const char *attribute,
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char **keys,
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char **ret_values) {
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return cg_get_keyed_attribute_full(controller, path, attribute, keys, ret_values, CG_KEY_MODE_GRACEFUL);
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}
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int cg_get_attribute_as_uint64(const char *controller, const char *path, const char *attribute, uint64_t *ret);
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/* Does a parse_boolean() on the attribute contents and sets ret accordingly */
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int cg_get_attribute_as_bool(const char *controller, const char *path, const char *attribute, bool *ret);
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int cg_set_access(const char *controller, const char *path, uid_t uid, gid_t gid);
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int cg_set_xattr(const char *controller, const char *path, const char *name, const void *value, size_t size, int flags);
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int cg_get_xattr(const char *controller, const char *path, const char *name, void *value, size_t size);
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int cg_get_xattr_malloc(const char *controller, const char *path, const char *name, char **ret);
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int cg_remove_xattr(const char *controller, const char *path, const char *name);
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int cg_install_release_agent(const char *controller, const char *agent);
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int cg_uninstall_release_agent(const char *controller);
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int cg_is_empty(const char *controller, const char *path);
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int cg_is_empty_recursive(const char *controller, const char *path);
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int cg_get_root_path(char **path);
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int cg_path_get_session(const char *path, char **session);
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int cg_path_get_owner_uid(const char *path, uid_t *uid);
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int cg_path_get_unit(const char *path, char **unit);
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int cg_path_get_user_unit(const char *path, char **unit);
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int cg_path_get_machine_name(const char *path, char **machine);
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int cg_path_get_slice(const char *path, char **slice);
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int cg_path_get_user_slice(const char *path, char **slice);
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int cg_shift_path(const char *cgroup, const char *cached_root, const char **shifted);
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int cg_pid_get_path_shifted(pid_t pid, const char *cached_root, char **cgroup);
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int cg_pid_get_session(pid_t pid, char **session);
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int cg_pid_get_owner_uid(pid_t pid, uid_t *uid);
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int cg_pid_get_unit(pid_t pid, char **unit);
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int cg_pid_get_user_unit(pid_t pid, char **unit);
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int cg_pid_get_machine_name(pid_t pid, char **machine);
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int cg_pid_get_slice(pid_t pid, char **slice);
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int cg_pid_get_user_slice(pid_t pid, char **slice);
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int cg_path_decode_unit(const char *cgroup, char **unit);
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char *cg_escape(const char *p);
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char *cg_unescape(const char *p) _pure_;
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bool cg_controller_is_valid(const char *p);
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int cg_slice_to_path(const char *unit, char **ret);
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typedef const char* (*cg_migrate_callback_t)(CGroupMask mask, void *userdata);
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int cg_mask_supported(CGroupMask *ret);
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int cg_mask_from_string(const char *s, CGroupMask *ret);
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int cg_mask_to_string(CGroupMask mask, char **ret);
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int cg_kernel_controllers(Set **controllers);
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bool cg_ns_supported(void);
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bool cg_freezer_supported(void);
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int cg_all_unified(void);
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int cg_hybrid_unified(void);
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int cg_unified_controller(const char *controller);
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int cg_unified_cached(bool flush);
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static inline int cg_unified(void) {
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return cg_unified_cached(true);
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}
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const char* cgroup_controller_to_string(CGroupController c) _const_;
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CGroupController cgroup_controller_from_string(const char *s) _pure_;
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bool is_cgroup_fs(const struct statfs *s);
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bool fd_is_cgroup_fs(int fd);
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typedef enum ManagedOOMMode {
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MANAGED_OOM_AUTO,
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MANAGED_OOM_KILL,
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_MANAGED_OOM_MODE_MAX,
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_MANAGED_OOM_MODE_INVALID = -1,
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} ManagedOOMMode;
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const char* managed_oom_mode_to_string(ManagedOOMMode m) _const_;
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ManagedOOMMode managed_oom_mode_from_string(const char *s) _pure_;
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