1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
25 #include <sys/types.h>
27 #include <sys/mount.h>
31 #include "cgroup-util.h"
34 int cgroup_bonding_realize(CGroupBonding *b) {
39 assert(b->controller);
41 r = cg_create(b->controller, b->path);
43 log_warning("Failed to create cgroup %s:%s: %s", b->controller, b->path, strerror(-r));
52 int cgroup_bonding_realize_list(CGroupBonding *first) {
56 LIST_FOREACH(by_unit, b, first)
57 if ((r = cgroup_bonding_realize(b)) < 0 && b->essential)
63 void cgroup_bonding_free(CGroupBonding *b, bool remove_or_trim) {
69 LIST_REMOVE(CGroupBonding, by_unit, b->unit->meta.cgroup_bondings, b);
71 if (streq(b->controller, SYSTEMD_CGROUP_CONTROLLER)) {
72 assert_se(f = hashmap_get(b->unit->meta.manager->cgroup_bondings, b->path));
73 LIST_REMOVE(CGroupBonding, by_path, f, b);
76 hashmap_replace(b->unit->meta.manager->cgroup_bondings, b->path, f);
78 hashmap_remove(b->unit->meta.manager->cgroup_bondings, b->path);
82 if (b->realized && b->ours && remove_or_trim) {
84 if (cgroup_bonding_is_empty(b) > 0)
85 cg_delete(b->controller, b->path);
87 cg_trim(b->controller, b->path, false);
95 void cgroup_bonding_free_list(CGroupBonding *first, bool remove_or_trim) {
98 LIST_FOREACH_SAFE(by_unit, b, n, first)
99 cgroup_bonding_free(b, remove_or_trim);
102 void cgroup_bonding_trim(CGroupBonding *b, bool delete_root) {
105 if (b->realized && b->ours)
106 cg_trim(b->controller, b->path, delete_root);
109 void cgroup_bonding_trim_list(CGroupBonding *first, bool delete_root) {
112 LIST_FOREACH(by_unit, b, first)
113 cgroup_bonding_trim(b, delete_root);
116 int cgroup_bonding_install(CGroupBonding *b, pid_t pid) {
122 if ((r = cg_create_and_attach(b->controller, b->path, pid)) < 0)
129 int cgroup_bonding_install_list(CGroupBonding *first, pid_t pid) {
133 LIST_FOREACH(by_unit, b, first)
134 if ((r = cgroup_bonding_install(b, pid)) < 0 && b->essential)
140 int cgroup_bonding_set_group_access(CGroupBonding *b, mode_t mode, uid_t uid, gid_t gid) {
146 return cg_set_group_access(b->controller, b->path, mode, uid, gid);
149 int cgroup_bonding_set_group_access_list(CGroupBonding *first, mode_t mode, uid_t uid, gid_t gid) {
153 LIST_FOREACH(by_unit, b, first) {
154 r = cgroup_bonding_set_group_access(b, mode, uid, gid);
162 int cgroup_bonding_set_task_access(CGroupBonding *b, mode_t mode, uid_t uid, gid_t gid) {
168 return cg_set_task_access(b->controller, b->path, mode, uid, gid);
171 int cgroup_bonding_set_task_access_list(CGroupBonding *first, mode_t mode, uid_t uid, gid_t gid) {
175 LIST_FOREACH(by_unit, b, first) {
176 r = cgroup_bonding_set_task_access(b, mode, uid, gid);
184 int cgroup_bonding_kill(CGroupBonding *b, int sig, bool sigcont, Set *s) {
188 /* Don't kill cgroups that aren't ours */
192 return cg_kill_recursive(b->controller, b->path, sig, sigcont, true, false, s);
195 int cgroup_bonding_kill_list(CGroupBonding *first, int sig, bool sigcont, Set *s) {
197 Set *allocated_set = NULL;
198 int ret = -EAGAIN, r;
201 if (!(s = allocated_set = set_new(trivial_hash_func, trivial_compare_func)))
204 LIST_FOREACH(by_unit, b, first) {
205 if ((r = cgroup_bonding_kill(b, sig, sigcont, s)) < 0) {
206 if (r == -EAGAIN || r == -ESRCH)
213 if (ret < 0 || r > 0)
219 set_free(allocated_set);
224 /* Returns 1 if the group is empty, 0 if it is not, -EAGAIN if we
226 int cgroup_bonding_is_empty(CGroupBonding *b) {
231 if ((r = cg_is_empty_recursive(b->controller, b->path, true)) < 0)
234 /* If it is empty it is empty */
238 /* It's not only us using this cgroup, so we just don't know */
239 return b->ours ? 0 : -EAGAIN;
242 int cgroup_bonding_is_empty_list(CGroupBonding *first) {
245 LIST_FOREACH(by_unit, b, first) {
248 if ((r = cgroup_bonding_is_empty(b)) < 0) {
249 /* If this returned -EAGAIN, then we don't know if the
250 * group is empty, so let's see if another group can
262 int manager_setup_cgroup(Manager *m) {
263 char *current = NULL, *path = NULL;
269 /* 0. Be nice to Ingo Molnar #628004 */
270 if (path_is_mount_point("/sys/fs/cgroup/systemd", false) <= 0) {
271 log_warning("No control group support available, not creating root group.");
275 /* 1. Determine hierarchy */
276 if ((r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 0, ¤t)) < 0) {
277 log_error("Cannot determine cgroup we are running in: %s", strerror(-r));
281 if (m->running_as == MANAGER_SYSTEM)
282 strcpy(suffix, "/system");
284 snprintf(suffix, sizeof(suffix), "/systemd-%lu", (unsigned long) getpid());
285 char_array_0(suffix);
288 free(m->cgroup_hierarchy);
289 if (endswith(current, suffix)) {
290 /* We probably got reexecuted and can continue to use our root cgroup */
291 m->cgroup_hierarchy = current;
295 /* We need a new root cgroup */
296 m->cgroup_hierarchy = NULL;
297 if (asprintf(&m->cgroup_hierarchy, "%s%s", streq(current, "/") ? "" : current, suffix) < 0) {
298 log_error("Out of memory");
305 if ((r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy, NULL, &path)) < 0) {
306 log_error("Cannot find cgroup mount point: %s", strerror(-r));
310 log_debug("Using cgroup controller " SYSTEMD_CGROUP_CONTROLLER ". File system hierarchy is at %s.", path);
312 /* 3. Install agent */
313 if ((r = cg_install_release_agent(SYSTEMD_CGROUP_CONTROLLER, SYSTEMD_CGROUP_AGENT_PATH)) < 0)
314 log_warning("Failed to install release agent, ignoring: %s", strerror(-r));
316 log_debug("Installed release agent.");
318 log_debug("Release agent already installed.");
320 /* 4. Realize the group */
321 if ((r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy, 0)) < 0) {
322 log_error("Failed to create root cgroup hierarchy: %s", strerror(-r));
326 /* 5. And pin it, so that it cannot be unmounted */
327 if (m->pin_cgroupfs_fd >= 0)
328 close_nointr_nofail(m->pin_cgroupfs_fd);
330 if ((m->pin_cgroupfs_fd = open(path, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOCTTY|O_NONBLOCK)) < 0) {
331 log_error("Failed to open pin file: %m");
336 log_debug("Created root group.");
345 void manager_shutdown_cgroup(Manager *m, bool delete) {
348 if (delete && m->cgroup_hierarchy)
349 cg_delete(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy);
351 if (m->pin_cgroupfs_fd >= 0) {
352 close_nointr_nofail(m->pin_cgroupfs_fd);
353 m->pin_cgroupfs_fd = -1;
356 free(m->cgroup_hierarchy);
357 m->cgroup_hierarchy = NULL;
360 int cgroup_notify_empty(Manager *m, const char *group) {
361 CGroupBonding *l, *b;
366 l = hashmap_get(m->cgroup_bondings, group);
370 LIST_FOREACH(by_path, b, l) {
376 t = cgroup_bonding_is_empty_list(b);
379 /* If we don't know, we don't know */
381 log_warning("Failed to check whether cgroup is empty: %s", strerror(errno));
387 /* If it is empty, let's delete it */
388 cgroup_bonding_trim_list(b->unit->meta.cgroup_bondings, true);
390 if (UNIT_VTABLE(b->unit)->cgroup_notify_empty)
391 UNIT_VTABLE(b->unit)->cgroup_notify_empty(b->unit);
398 Unit* cgroup_unit_by_pid(Manager *m, pid_t pid) {
399 CGroupBonding *l, *b;
407 if (cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &group) < 0)
410 l = hashmap_get(m->cgroup_bondings, group);
415 while ((slash = strrchr(group, '/'))) {
421 if ((l = hashmap_get(m->cgroup_bondings, group)))
428 LIST_FOREACH(by_path, b, l) {
440 CGroupBonding *cgroup_bonding_find_list(CGroupBonding *first, const char *controller) {
445 LIST_FOREACH(by_unit, b, first)
446 if (streq(b->controller, controller))
452 char *cgroup_bonding_to_string(CGroupBonding *b) {
457 if (asprintf(&r, "%s:%s", b->controller, b->path) < 0)
463 pid_t cgroup_bonding_search_main_pid(CGroupBonding *b) {
465 pid_t pid = 0, npid, mypid;
472 if (cg_enumerate_processes(b->controller, b->path, &f) < 0)
477 while (cg_read_pid(f, &npid) > 0) {
483 /* Ignore processes that aren't our kids */
484 if (get_parent_of_pid(npid, &ppid) >= 0 && ppid != mypid)
488 /* Dang, there's more than one daemonized PID
489 in this group, so we don't know what process
490 is the main process. */
503 pid_t cgroup_bonding_search_main_pid_list(CGroupBonding *first) {
507 /* Try to find a main pid from this cgroup, but checking if
508 * there's only one PID in the cgroup and returning it. Later
509 * on we might want to add additional, smarter heuristics
512 LIST_FOREACH(by_unit, b, first)
513 if ((pid = cgroup_bonding_search_main_pid(b)) != 0)