/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ #pragma once /*** This file is part of systemd. Copyright 2010 Lennart Poettering systemd is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. systemd 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with systemd; If not, see <http://www.gnu.org/licenses/>. ***/ #include <dirent.h> #include <stdbool.h> #include <stdint.h> #include <stdio.h> #include <sys/types.h> #include "def.h" #include "hashmap.h" #include "macro.h" #include "set.h" /* An enum of well known cgroup controllers */ typedef enum CGroupController { CGROUP_CONTROLLER_CPU, CGROUP_CONTROLLER_CPUACCT, CGROUP_CONTROLLER_BLKIO, CGROUP_CONTROLLER_MEMORY, CGROUP_CONTROLLER_DEVICES, CGROUP_CONTROLLER_PIDS, CGROUP_CONTROLLER_NET_CLS, _CGROUP_CONTROLLER_MAX, _CGROUP_CONTROLLER_INVALID = -1, } CGroupController; #define CGROUP_CONTROLLER_TO_MASK(c) (1 << (c)) /* A bit mask of well known cgroup controllers */ typedef enum CGroupMask { CGROUP_MASK_CPU = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_CPU), CGROUP_MASK_CPUACCT = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_CPUACCT), CGROUP_MASK_BLKIO = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_BLKIO), CGROUP_MASK_MEMORY = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_MEMORY), CGROUP_MASK_DEVICES = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_DEVICES), CGROUP_MASK_PIDS = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_PIDS), CGROUP_MASK_NET_CLS = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_NET_CLS), _CGROUP_MASK_ALL = CGROUP_CONTROLLER_TO_MASK(_CGROUP_CONTROLLER_MAX) - 1 } CGroupMask; /* Special values for the cpu.shares attribute */ #define CGROUP_CPU_SHARES_INVALID ((uint64_t) -1) #define CGROUP_CPU_SHARES_MIN UINT64_C(2) #define CGROUP_CPU_SHARES_MAX UINT64_C(262144) #define CGROUP_CPU_SHARES_DEFAULT UINT64_C(1024) static inline bool CGROUP_CPU_SHARES_IS_OK(uint64_t x) { return x == CGROUP_CPU_SHARES_INVALID || (x >= CGROUP_CPU_SHARES_MIN && x <= CGROUP_CPU_SHARES_MAX); } /* Special values for the blkio.weight attribute */ #define CGROUP_BLKIO_WEIGHT_INVALID ((uint64_t) -1) #define CGROUP_BLKIO_WEIGHT_MIN UINT64_C(10) #define CGROUP_BLKIO_WEIGHT_MAX UINT64_C(1000) #define CGROUP_BLKIO_WEIGHT_DEFAULT UINT64_C(500) static inline bool CGROUP_BLKIO_WEIGHT_IS_OK(uint64_t x) { return x == CGROUP_BLKIO_WEIGHT_INVALID || (x >= CGROUP_BLKIO_WEIGHT_MIN && x <= CGROUP_BLKIO_WEIGHT_MAX); } /* * General rules: * * We accept named hierarchies in the syntax "foo" and "name=foo". * * We expect that named hierarchies do not conflict in name with a * kernel hierarchy, modulo the "name=" prefix. * * We always generate "normalized" controller names, i.e. without the * "name=" prefix. * * We require absolute cgroup paths. When returning, we will always * generate paths with multiple adjacent / removed. */ int cg_enumerate_processes(const char *controller, const char *path, FILE **_f); int cg_read_pid(FILE *f, pid_t *_pid); int cg_enumerate_subgroups(const char *controller, const char *path, DIR **_d); int cg_read_subgroup(DIR *d, char **fn); int cg_kill(const char *controller, const char *path, int sig, bool sigcont, bool ignore_self, Set *s); int cg_kill_recursive(const char *controller, const char *path, int sig, bool sigcont, bool ignore_self, bool remove, Set *s); int cg_migrate(const char *cfrom, const char *pfrom, const char *cto, const char *pto, bool ignore_self); int cg_migrate_recursive(const char *cfrom, const char *pfrom, const char *cto, const char *pto, bool ignore_self, bool remove); int cg_migrate_recursive_fallback(const char *cfrom, const char *pfrom, const char *cto, const char *pto, bool ignore_self, bool rem); int cg_split_spec(const char *spec, char **controller, char **path); int cg_mangle_path(const char *path, char **result); int cg_get_path(const char *controller, const char *path, const char *suffix, char **fs); int cg_get_path_and_check(const char *controller, const char *path, const char *suffix, char **fs); int cg_pid_get_path(const char *controller, pid_t pid, char **path); int cg_trim(const char *controller, const char *path, bool delete_root); int cg_rmdir(const char *controller, const char *path); int cg_create(const char *controller, const char *path); int cg_attach(const char *controller, const char *path, pid_t pid); int cg_attach_fallback(const char *controller, const char *path, pid_t pid); int cg_create_and_attach(const char *controller, const char *path, pid_t pid); int cg_set_attribute(const char *controller, const char *path, const char *attribute, const char *value); int cg_get_attribute(const char *controller, const char *path, const char *attribute, char **ret); int cg_set_group_access(const char *controller, const char *path, mode_t mode, uid_t uid, gid_t gid); int cg_set_task_access(const char *controller, const char *path, mode_t mode, uid_t uid, gid_t gid); int cg_install_release_agent(const char *controller, const char *agent); int cg_uninstall_release_agent(const char *controller); int cg_is_empty(const char *controller, const char *path); int cg_is_empty_recursive(const char *controller, const char *path); int cg_get_root_path(char **path); int cg_path_get_session(const char *path, char **session); int cg_path_get_owner_uid(const char *path, uid_t *uid); int cg_path_get_unit(const char *path, char **unit); int cg_path_get_user_unit(const char *path, char **unit); int cg_path_get_machine_name(const char *path, char **machine); int cg_path_get_slice(const char *path, char **slice); int cg_path_get_user_slice(const char *path, char **slice); int cg_shift_path(const char *cgroup, const char *cached_root, const char **shifted); int cg_pid_get_path_shifted(pid_t pid, const char *cached_root, char **cgroup); int cg_pid_get_session(pid_t pid, char **session); int cg_pid_get_owner_uid(pid_t pid, uid_t *uid); int cg_pid_get_unit(pid_t pid, char **unit); int cg_pid_get_user_unit(pid_t pid, char **unit); int cg_pid_get_machine_name(pid_t pid, char **machine); int cg_pid_get_slice(pid_t pid, char **slice); int cg_pid_get_user_slice(pid_t pid, char **slice); int cg_path_decode_unit(const char *cgroup, char **unit); char *cg_escape(const char *p); char *cg_unescape(const char *p) _pure_; bool cg_controller_is_valid(const char *p); int cg_slice_to_path(const char *unit, char **ret); typedef const char* (*cg_migrate_callback_t)(CGroupMask mask, void *userdata); int cg_create_everywhere(CGroupMask supported, CGroupMask mask, const char *path); int cg_attach_everywhere(CGroupMask supported, const char *path, pid_t pid, cg_migrate_callback_t callback, void *userdata); int cg_attach_many_everywhere(CGroupMask supported, const char *path, Set* pids, cg_migrate_callback_t callback, void *userdata); int cg_migrate_everywhere(CGroupMask supported, const char *from, const char *to, cg_migrate_callback_t callback, void *userdata); int cg_trim_everywhere(CGroupMask supported, const char *path, bool delete_root); int cg_enable_everywhere(CGroupMask supported, CGroupMask mask, const char *p); int cg_mask_supported(CGroupMask *ret); int cg_kernel_controllers(Set *controllers); int cg_unified(void); void cg_unified_flush(void); bool cg_is_unified_wanted(void); bool cg_is_legacy_wanted(void); const char* cgroup_controller_to_string(CGroupController c) _const_; CGroupController cgroup_controller_from_string(const char *s) _pure_; int cg_cpu_shares_parse(const char *s, uint64_t *ret); int cg_blkio_weight_parse(const char *s, uint64_t *ret);