257 lines
10 KiB
C
257 lines
10 KiB
C
#pragma once
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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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/types.h>
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#include "def.h"
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#include "hashmap.h"
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#include "macro.h"
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#include "set.h"
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/* An enum of well known cgroup controllers */
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typedef enum CGroupController {
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CGROUP_CONTROLLER_CPU,
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CGROUP_CONTROLLER_CPUACCT,
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CGROUP_CONTROLLER_IO,
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CGROUP_CONTROLLER_BLKIO,
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CGROUP_CONTROLLER_MEMORY,
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CGROUP_CONTROLLER_DEVICES,
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CGROUP_CONTROLLER_PIDS,
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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) (1 << (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_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_ALL = CGROUP_CONTROLLER_TO_MASK(_CGROUP_CONTROLLER_MAX) - 1
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} CGroupMask;
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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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/* Default resource limits */
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#define DEFAULT_TASKS_MAX_PERCENTAGE 15U /* 15% of PIDs, 4915 on default settings */
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#define DEFAULT_USER_TASKS_MAX_PERCENTAGE 33U /* 33% of PIDs, 10813 on default settings */
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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,
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CGROUP_IGNORE_SELF = 2,
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CGROUP_REMOVE = 4,
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} CGroupFlags;
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typedef void (*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_migrate(const char *cfrom, const char *pfrom, const char *cto, const char *pto, CGroupFlags flags);
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int cg_migrate_recursive(const char *cfrom, const char *pfrom, const char *cto, const char *pto, CGroupFlags flags);
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int cg_migrate_recursive_fallback(const char *cfrom, const char *pfrom, const char *cto, const char *pto, CGroupFlags flags);
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int cg_split_spec(const char *spec, char **controller, char **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_trim(const char *controller, const char *path, bool delete_root);
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int cg_rmdir(const char *controller, const char *path);
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int cg_create(const char *controller, const char *path);
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int cg_attach(const char *controller, const char *path, pid_t pid);
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int cg_attach_fallback(const char *controller, const char *path, pid_t pid);
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int cg_create_and_attach(const char *controller, const char *path, pid_t pid);
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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(const char *controller, const char *path, const char *attribute, const char **keys, char **values);
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int cg_set_group_access(const char *controller, const char *path, mode_t mode, uid_t uid, gid_t gid);
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int cg_set_task_access(const char *controller, const char *path, mode_t mode, 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_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_create_everywhere(CGroupMask supported, CGroupMask mask, const char *path);
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int cg_attach_everywhere(CGroupMask supported, const char *path, pid_t pid, cg_migrate_callback_t callback, void *userdata);
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int cg_attach_many_everywhere(CGroupMask supported, const char *path, Set* pids, cg_migrate_callback_t callback, void *userdata);
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int cg_migrate_everywhere(CGroupMask supported, const char *from, const char *to, cg_migrate_callback_t callback, void *userdata);
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int cg_trim_everywhere(CGroupMask supported, const char *path, bool delete_root);
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int cg_enable_everywhere(CGroupMask supported, CGroupMask mask, const char *p);
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int cg_mask_supported(CGroupMask *ret);
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int cg_kernel_controllers(Set *controllers);
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bool cg_ns_supported(void);
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int cg_all_unified(void);
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int cg_unified(const char *controller);
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void cg_unified_flush(void);
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bool cg_is_unified_wanted(void);
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bool cg_is_legacy_wanted(void);
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bool cg_is_unified_systemd_controller_wanted(void);
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bool cg_is_legacy_systemd_controller_wanted(void);
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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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int cg_weight_parse(const char *s, uint64_t *ret);
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int cg_cpu_shares_parse(const char *s, uint64_t *ret);
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int cg_blkio_weight_parse(const char *s, uint64_t *ret);
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