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 Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser 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 #include "path-util.h"
36 int cgroup_bonding_realize(CGroupBonding *b) {
41 assert(b->controller);
43 r = cg_create(b->controller, b->path);
45 log_warning("Failed to create cgroup %s:%s: %s", b->controller, b->path, strerror(-r));
54 int cgroup_bonding_realize_list(CGroupBonding *first) {
58 LIST_FOREACH(by_unit, b, first)
59 if ((r = cgroup_bonding_realize(b)) < 0 && b->essential)
65 void cgroup_bonding_free(CGroupBonding *b, bool trim) {
71 LIST_REMOVE(CGroupBonding, by_unit, b->unit->cgroup_bondings, b);
73 if (streq(b->controller, SYSTEMD_CGROUP_CONTROLLER)) {
74 assert_se(f = hashmap_get(b->unit->manager->cgroup_bondings, b->path));
75 LIST_REMOVE(CGroupBonding, by_path, f, b);
78 hashmap_replace(b->unit->manager->cgroup_bondings, b->path, f);
80 hashmap_remove(b->unit->manager->cgroup_bondings, b->path);
84 if (b->realized && b->ours && trim)
85 cg_trim(b->controller, b->path, false);
92 void cgroup_bonding_free_list(CGroupBonding *first, bool remove_or_trim) {
95 LIST_FOREACH_SAFE(by_unit, b, n, first)
96 cgroup_bonding_free(b, remove_or_trim);
99 void cgroup_bonding_trim(CGroupBonding *b, bool delete_root) {
102 if (b->realized && b->ours)
103 cg_trim(b->controller, b->path, delete_root);
106 void cgroup_bonding_trim_list(CGroupBonding *first, bool delete_root) {
109 LIST_FOREACH(by_unit, b, first)
110 cgroup_bonding_trim(b, delete_root);
114 int cgroup_bonding_install(CGroupBonding *b, pid_t pid, const char *cgroup_suffix) {
123 p = strjoin(b->path, "/", cgroup_suffix, NULL);
131 r = cg_create_and_attach(b->controller, path, pid);
141 int cgroup_bonding_install_list(CGroupBonding *first, pid_t pid, const char *cgroup_suffix) {
145 LIST_FOREACH(by_unit, b, first) {
146 r = cgroup_bonding_install(b, pid, cgroup_suffix);
147 if (r < 0 && b->essential)
154 int cgroup_bonding_set_group_access(CGroupBonding *b, mode_t mode, uid_t uid, gid_t gid) {
160 return cg_set_group_access(b->controller, b->path, mode, uid, gid);
163 int cgroup_bonding_set_group_access_list(CGroupBonding *first, mode_t mode, uid_t uid, gid_t gid) {
167 LIST_FOREACH(by_unit, b, first) {
168 r = cgroup_bonding_set_group_access(b, mode, uid, gid);
176 int cgroup_bonding_set_task_access(CGroupBonding *b, mode_t mode, uid_t uid, gid_t gid, int sticky) {
182 return cg_set_task_access(b->controller, b->path, mode, uid, gid, sticky);
185 int cgroup_bonding_set_task_access_list(CGroupBonding *first, mode_t mode, uid_t uid, gid_t gid, int sticky) {
189 LIST_FOREACH(by_unit, b, first) {
190 r = cgroup_bonding_set_task_access(b, mode, uid, gid, sticky);
198 int cgroup_bonding_kill(CGroupBonding *b, int sig, bool sigcont, bool rem, Set *s, const char *cgroup_suffix) {
206 /* Don't kill cgroups that aren't ours */
211 p = strjoin(b->path, "/", cgroup_suffix, NULL);
219 r = cg_kill_recursive(b->controller, path, sig, sigcont, true, rem, s);
225 int cgroup_bonding_kill_list(CGroupBonding *first, int sig, bool sigcont, bool rem, Set *s, const char *cgroup_suffix) {
227 Set *allocated_set = NULL;
228 int ret = -EAGAIN, r;
234 if (!(s = allocated_set = set_new(trivial_hash_func, trivial_compare_func)))
237 LIST_FOREACH(by_unit, b, first) {
238 r = cgroup_bonding_kill(b, sig, sigcont, rem, s, cgroup_suffix);
240 if (r == -EAGAIN || r == -ESRCH)
247 if (ret < 0 || r > 0)
253 set_free(allocated_set);
258 /* Returns 1 if the group is empty, 0 if it is not, -EAGAIN if we
260 int cgroup_bonding_is_empty(CGroupBonding *b) {
265 if ((r = cg_is_empty_recursive(b->controller, b->path, true)) < 0)
268 /* If it is empty it is empty */
272 /* It's not only us using this cgroup, so we just don't know */
273 return b->ours ? 0 : -EAGAIN;
276 int cgroup_bonding_is_empty_list(CGroupBonding *first) {
279 LIST_FOREACH(by_unit, b, first) {
282 if ((r = cgroup_bonding_is_empty(b)) < 0) {
283 /* If this returned -EAGAIN, then we don't know if the
284 * group is empty, so let's see if another group can
296 int manager_setup_cgroup(Manager *m) {
297 char *current = NULL, *path = NULL;
303 /* 0. Be nice to Ingo Molnar #628004 */
304 if (path_is_mount_point("/sys/fs/cgroup/systemd", false) <= 0) {
305 log_warning("No control group support available, not creating root group.");
309 /* 1. Determine hierarchy */
310 r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 0, ¤t);
312 log_error("Cannot determine cgroup we are running in: %s", strerror(-r));
316 if (m->running_as == SYSTEMD_SYSTEM)
317 strcpy(suffix, "/system");
319 snprintf(suffix, sizeof(suffix), "/systemd-%lu", (unsigned long) getpid());
320 char_array_0(suffix);
323 free(m->cgroup_hierarchy);
324 if (endswith(current, suffix)) {
325 /* We probably got reexecuted and can continue to use our root cgroup */
326 m->cgroup_hierarchy = current;
330 /* We need a new root cgroup */
331 m->cgroup_hierarchy = NULL;
332 if (asprintf(&m->cgroup_hierarchy, "%s%s", streq(current, "/") ? "" : current, suffix) < 0) {
339 r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy, NULL, &path);
341 log_error("Cannot find cgroup mount point: %s", strerror(-r));
345 log_debug("Using cgroup controller " SYSTEMD_CGROUP_CONTROLLER ". File system hierarchy is at %s.", path);
347 /* 3. Install agent */
348 r = cg_install_release_agent(SYSTEMD_CGROUP_CONTROLLER, SYSTEMD_CGROUP_AGENT_PATH);
350 log_warning("Failed to install release agent, ignoring: %s", strerror(-r));
352 log_debug("Installed release agent.");
354 log_debug("Release agent already installed.");
356 /* 4. Realize the group */
357 r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy, 0);
359 log_error("Failed to create root cgroup hierarchy: %s", strerror(-r));
363 /* 5. And pin it, so that it cannot be unmounted */
364 if (m->pin_cgroupfs_fd >= 0)
365 close_nointr_nofail(m->pin_cgroupfs_fd);
367 m->pin_cgroupfs_fd = open(path, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOCTTY|O_NONBLOCK);
369 log_error("Failed to open pin file: %m");
374 log_debug("Created root group.");
376 cg_shorten_controllers(m->default_controllers);
385 void manager_shutdown_cgroup(Manager *m, bool delete) {
388 if (delete && m->cgroup_hierarchy)
389 cg_delete(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy);
391 if (m->pin_cgroupfs_fd >= 0) {
392 close_nointr_nofail(m->pin_cgroupfs_fd);
393 m->pin_cgroupfs_fd = -1;
396 free(m->cgroup_hierarchy);
397 m->cgroup_hierarchy = NULL;
400 int cgroup_bonding_get(Manager *m, const char *cgroup, CGroupBonding **bonding) {
408 b = hashmap_get(m->cgroup_bondings, cgroup);
430 b = hashmap_get(m->cgroup_bondings, p);
439 int cgroup_notify_empty(Manager *m, const char *group) {
440 CGroupBonding *l, *b;
446 r = cgroup_bonding_get(m, group, &l);
450 LIST_FOREACH(by_path, b, l) {
456 t = cgroup_bonding_is_empty_list(b);
459 /* If we don't know, we don't know */
461 log_warning("Failed to check whether cgroup is empty: %s", strerror(errno));
467 /* If it is empty, let's delete it */
468 cgroup_bonding_trim_list(b->unit->cgroup_bondings, true);
470 if (UNIT_VTABLE(b->unit)->cgroup_notify_empty)
471 UNIT_VTABLE(b->unit)->cgroup_notify_empty(b->unit);
478 Unit* cgroup_unit_by_pid(Manager *m, pid_t pid) {
479 CGroupBonding *l, *b;
487 if (cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &group) < 0)
490 l = hashmap_get(m->cgroup_bondings, group);
495 while ((slash = strrchr(group, '/'))) {
501 if ((l = hashmap_get(m->cgroup_bondings, group)))
508 LIST_FOREACH(by_path, b, l) {
520 CGroupBonding *cgroup_bonding_find_list(CGroupBonding *first, const char *controller) {
525 LIST_FOREACH(by_unit, b, first)
526 if (streq(b->controller, controller))
532 char *cgroup_bonding_to_string(CGroupBonding *b) {
537 if (asprintf(&r, "%s:%s", b->controller, b->path) < 0)
543 pid_t cgroup_bonding_search_main_pid(CGroupBonding *b) {
545 pid_t pid = 0, npid, mypid;
552 if (cg_enumerate_processes(b->controller, b->path, &f) < 0)
557 while (cg_read_pid(f, &npid) > 0) {
563 /* Ignore processes that aren't our kids */
564 if (get_parent_of_pid(npid, &ppid) >= 0 && ppid != mypid)
568 /* Dang, there's more than one daemonized PID
569 in this group, so we don't know what process
570 is the main process. */
583 pid_t cgroup_bonding_search_main_pid_list(CGroupBonding *first) {
587 /* Try to find a main pid from this cgroup, but checking if
588 * there's only one PID in the cgroup and returning it. Later
589 * on we might want to add additional, smarter heuristics
592 LIST_FOREACH(by_unit, b, first)
593 if ((pid = cgroup_bonding_search_main_pid(b)) != 0)