+++ /dev/null
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-/***
- 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 General Public License as published by
- the Free Software Foundation; either version 2 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
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include <errno.h>
-#include <assert.h>
-#include <unistd.h>
-#include <sys/types.h>
-#include <signal.h>
-#include <sys/mount.h>
-#include <fcntl.h>
-
-#include "cgroup.h"
-#include "cgroup-util.h"
-#include "log.h"
-
-int cgroup_bonding_realize(CGroupBonding *b) {
- int r;
-
- assert(b);
- assert(b->path);
- assert(b->controller);
-
- r = cg_create(b->controller, b->path);
- if (r < 0) {
- log_warning("Failed to create cgroup %s:%s: %s", b->controller, b->path, strerror(-r));
- return r;
- }
-
- b->realized = true;
-
- return 0;
-}
-
-int cgroup_bonding_realize_list(CGroupBonding *first) {
- CGroupBonding *b;
- int r;
-
- LIST_FOREACH(by_unit, b, first)
- if ((r = cgroup_bonding_realize(b)) < 0 && b->essential)
- return r;
-
- return 0;
-}
-
-void cgroup_bonding_free(CGroupBonding *b, bool trim) {
- assert(b);
-
- if (b->unit) {
- CGroupBonding *f;
-
- LIST_REMOVE(CGroupBonding, by_unit, b->unit->cgroup_bondings, b);
-
- if (streq(b->controller, SYSTEMD_CGROUP_CONTROLLER)) {
- assert_se(f = hashmap_get(b->unit->manager->cgroup_bondings, b->path));
- LIST_REMOVE(CGroupBonding, by_path, f, b);
-
- if (f)
- hashmap_replace(b->unit->manager->cgroup_bondings, b->path, f);
- else
- hashmap_remove(b->unit->manager->cgroup_bondings, b->path);
- }
- }
-
- if (b->realized && b->ours && trim)
- cg_trim(b->controller, b->path, false);
-
- free(b->controller);
- free(b->path);
- free(b);
-}
-
-void cgroup_bonding_free_list(CGroupBonding *first, bool remove_or_trim) {
- CGroupBonding *b, *n;
-
- LIST_FOREACH_SAFE(by_unit, b, n, first)
- cgroup_bonding_free(b, remove_or_trim);
-}
-
-void cgroup_bonding_trim(CGroupBonding *b, bool delete_root) {
- assert(b);
-
- if (b->realized && b->ours)
- cg_trim(b->controller, b->path, delete_root);
-}
-
-void cgroup_bonding_trim_list(CGroupBonding *first, bool delete_root) {
- CGroupBonding *b;
-
- LIST_FOREACH(by_unit, b, first)
- cgroup_bonding_trim(b, delete_root);
-}
-
-int cgroup_bonding_install(CGroupBonding *b, pid_t pid) {
- int r;
-
- assert(b);
- assert(pid >= 0);
-
- if ((r = cg_create_and_attach(b->controller, b->path, pid)) < 0)
- return r;
-
- b->realized = true;
- return 0;
-}
-
-int cgroup_bonding_install_list(CGroupBonding *first, pid_t pid) {
- CGroupBonding *b;
- int r;
-
- LIST_FOREACH(by_unit, b, first)
- if ((r = cgroup_bonding_install(b, pid)) < 0 && b->essential)
- return r;
-
- return 0;
-}
-
-int cgroup_bonding_set_group_access(CGroupBonding *b, mode_t mode, uid_t uid, gid_t gid) {
- assert(b);
-
- if (!b->realized)
- return -EINVAL;
-
- return cg_set_group_access(b->controller, b->path, mode, uid, gid);
-}
-
-int cgroup_bonding_set_group_access_list(CGroupBonding *first, mode_t mode, uid_t uid, gid_t gid) {
- CGroupBonding *b;
- int r;
-
- LIST_FOREACH(by_unit, b, first) {
- r = cgroup_bonding_set_group_access(b, mode, uid, gid);
- if (r < 0)
- return r;
- }
-
- return 0;
-}
-
-int cgroup_bonding_set_task_access(CGroupBonding *b, mode_t mode, uid_t uid, gid_t gid, int sticky) {
- assert(b);
-
- if (!b->realized)
- return -EINVAL;
-
- return cg_set_task_access(b->controller, b->path, mode, uid, gid, sticky);
-}
-
-int cgroup_bonding_set_task_access_list(CGroupBonding *first, mode_t mode, uid_t uid, gid_t gid, int sticky) {
- CGroupBonding *b;
- int r;
-
- LIST_FOREACH(by_unit, b, first) {
- r = cgroup_bonding_set_task_access(b, mode, uid, gid, sticky);
- if (r < 0)
- return r;
- }
-
- return 0;
-}
-
-int cgroup_bonding_kill(CGroupBonding *b, int sig, bool sigcont, Set *s) {
- assert(b);
- assert(sig >= 0);
-
- /* Don't kill cgroups that aren't ours */
- if (!b->ours)
- return 0;
-
- return cg_kill_recursive(b->controller, b->path, sig, sigcont, true, false, s);
-}
-
-int cgroup_bonding_kill_list(CGroupBonding *first, int sig, bool sigcont, Set *s) {
- CGroupBonding *b;
- Set *allocated_set = NULL;
- int ret = -EAGAIN, r;
-
- if (!first)
- return 0;
-
- if (!s)
- if (!(s = allocated_set = set_new(trivial_hash_func, trivial_compare_func)))
- return -ENOMEM;
-
- LIST_FOREACH(by_unit, b, first) {
- if ((r = cgroup_bonding_kill(b, sig, sigcont, s)) < 0) {
- if (r == -EAGAIN || r == -ESRCH)
- continue;
-
- ret = r;
- goto finish;
- }
-
- if (ret < 0 || r > 0)
- ret = r;
- }
-
-finish:
- if (allocated_set)
- set_free(allocated_set);
-
- return ret;
-}
-
-/* Returns 1 if the group is empty, 0 if it is not, -EAGAIN if we
- * cannot know */
-int cgroup_bonding_is_empty(CGroupBonding *b) {
- int r;
-
- assert(b);
-
- if ((r = cg_is_empty_recursive(b->controller, b->path, true)) < 0)
- return r;
-
- /* If it is empty it is empty */
- if (r > 0)
- return 1;
-
- /* It's not only us using this cgroup, so we just don't know */
- return b->ours ? 0 : -EAGAIN;
-}
-
-int cgroup_bonding_is_empty_list(CGroupBonding *first) {
- CGroupBonding *b;
-
- LIST_FOREACH(by_unit, b, first) {
- int r;
-
- if ((r = cgroup_bonding_is_empty(b)) < 0) {
- /* If this returned -EAGAIN, then we don't know if the
- * group is empty, so let's see if another group can
- * tell us */
-
- if (r != -EAGAIN)
- return r;
- } else
- return r;
- }
-
- return -EAGAIN;
-}
-
-int manager_setup_cgroup(Manager *m) {
- char *current = NULL, *path = NULL;
- int r;
- char suffix[32];
-
- assert(m);
-
- /* 0. Be nice to Ingo Molnar #628004 */
- if (path_is_mount_point("/sys/fs/cgroup/systemd", false) <= 0) {
- log_warning("No control group support available, not creating root group.");
- return 0;
- }
-
- /* 1. Determine hierarchy */
- if ((r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 0, ¤t)) < 0) {
- log_error("Cannot determine cgroup we are running in: %s", strerror(-r));
- goto finish;
- }
-
- if (m->running_as == MANAGER_SYSTEM)
- strcpy(suffix, "/system");
- else {
- snprintf(suffix, sizeof(suffix), "/systemd-%lu", (unsigned long) getpid());
- char_array_0(suffix);
- }
-
- free(m->cgroup_hierarchy);
- if (endswith(current, suffix)) {
- /* We probably got reexecuted and can continue to use our root cgroup */
- m->cgroup_hierarchy = current;
- current = NULL;
-
- } else {
- /* We need a new root cgroup */
- m->cgroup_hierarchy = NULL;
- if (asprintf(&m->cgroup_hierarchy, "%s%s", streq(current, "/") ? "" : current, suffix) < 0) {
- log_error("Out of memory");
- r = -ENOMEM;
- goto finish;
- }
- }
-
- /* 2. Show data */
- if ((r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy, NULL, &path)) < 0) {
- log_error("Cannot find cgroup mount point: %s", strerror(-r));
- goto finish;
- }
-
- log_debug("Using cgroup controller " SYSTEMD_CGROUP_CONTROLLER ". File system hierarchy is at %s.", path);
-
- /* 3. Install agent */
- if ((r = cg_install_release_agent(SYSTEMD_CGROUP_CONTROLLER, SYSTEMD_CGROUP_AGENT_PATH)) < 0)
- log_warning("Failed to install release agent, ignoring: %s", strerror(-r));
- else if (r > 0)
- log_debug("Installed release agent.");
- else
- log_debug("Release agent already installed.");
-
- /* 4. Realize the group */
- if ((r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy, 0)) < 0) {
- log_error("Failed to create root cgroup hierarchy: %s", strerror(-r));
- goto finish;
- }
-
- /* 5. And pin it, so that it cannot be unmounted */
- if (m->pin_cgroupfs_fd >= 0)
- close_nointr_nofail(m->pin_cgroupfs_fd);
-
- if ((m->pin_cgroupfs_fd = open(path, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOCTTY|O_NONBLOCK)) < 0) {
- log_error("Failed to open pin file: %m");
- r = -errno;
- goto finish;
- }
-
- log_debug("Created root group.");
-
-finish:
- free(current);
- free(path);
-
- return r;
-}
-
-void manager_shutdown_cgroup(Manager *m, bool delete) {
- assert(m);
-
- if (delete && m->cgroup_hierarchy)
- cg_delete(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy);
-
- if (m->pin_cgroupfs_fd >= 0) {
- close_nointr_nofail(m->pin_cgroupfs_fd);
- m->pin_cgroupfs_fd = -1;
- }
-
- free(m->cgroup_hierarchy);
- m->cgroup_hierarchy = NULL;
-}
-
-int cgroup_bonding_get(Manager *m, const char *cgroup, CGroupBonding **bonding) {
- CGroupBonding *b;
- char *p;
-
- assert(m);
- assert(cgroup);
- assert(bonding);
-
- b = hashmap_get(m->cgroup_bondings, cgroup);
- if (b) {
- *bonding = b;
- return 1;
- }
-
- p = strdup(cgroup);
- if (!p)
- return -ENOMEM;
-
- for (;;) {
- char *e;
-
- e = strrchr(p, '/');
- if (!e || e == p) {
- free(p);
- *bonding = NULL;
- return 0;
- }
-
- *e = 0;
-
- b = hashmap_get(m->cgroup_bondings, p);
- if (b) {
- free(p);
- *bonding = b;
- return 1;
- }
- }
-}
-
-int cgroup_notify_empty(Manager *m, const char *group) {
- CGroupBonding *l, *b;
- int r;
-
- assert(m);
- assert(group);
-
- r = cgroup_bonding_get(m, group, &l);
- if (r <= 0)
- return r;
-
- LIST_FOREACH(by_path, b, l) {
- int t;
-
- if (!b->unit)
- continue;
-
- t = cgroup_bonding_is_empty_list(b);
- if (t < 0) {
-
- /* If we don't know, we don't know */
- if (t != -EAGAIN)
- log_warning("Failed to check whether cgroup is empty: %s", strerror(errno));
-
- continue;
- }
-
- if (t > 0) {
- /* If it is empty, let's delete it */
- cgroup_bonding_trim_list(b->unit->cgroup_bondings, true);
-
- if (UNIT_VTABLE(b->unit)->cgroup_notify_empty)
- UNIT_VTABLE(b->unit)->cgroup_notify_empty(b->unit);
- }
- }
-
- return 0;
-}
-
-Unit* cgroup_unit_by_pid(Manager *m, pid_t pid) {
- CGroupBonding *l, *b;
- char *group = NULL;
-
- assert(m);
-
- if (pid <= 1)
- return NULL;
-
- if (cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &group) < 0)
- return NULL;
-
- l = hashmap_get(m->cgroup_bondings, group);
-
- if (!l) {
- char *slash;
-
- while ((slash = strrchr(group, '/'))) {
- if (slash == group)
- break;
-
- *slash = 0;
-
- if ((l = hashmap_get(m->cgroup_bondings, group)))
- break;
- }
- }
-
- free(group);
-
- LIST_FOREACH(by_path, b, l) {
-
- if (!b->unit)
- continue;
-
- if (b->ours)
- return b->unit;
- }
-
- return NULL;
-}
-
-CGroupBonding *cgroup_bonding_find_list(CGroupBonding *first, const char *controller) {
- CGroupBonding *b;
-
- assert(controller);
-
- LIST_FOREACH(by_unit, b, first)
- if (streq(b->controller, controller))
- return b;
-
- return NULL;
-}
-
-char *cgroup_bonding_to_string(CGroupBonding *b) {
- char *r;
-
- assert(b);
-
- if (asprintf(&r, "%s:%s", b->controller, b->path) < 0)
- return NULL;
-
- return r;
-}
-
-pid_t cgroup_bonding_search_main_pid(CGroupBonding *b) {
- FILE *f;
- pid_t pid = 0, npid, mypid;
-
- assert(b);
-
- if (!b->ours)
- return 0;
-
- if (cg_enumerate_processes(b->controller, b->path, &f) < 0)
- return 0;
-
- mypid = getpid();
-
- while (cg_read_pid(f, &npid) > 0) {
- pid_t ppid;
-
- if (npid == pid)
- continue;
-
- /* Ignore processes that aren't our kids */
- if (get_parent_of_pid(npid, &ppid) >= 0 && ppid != mypid)
- continue;
-
- if (pid != 0) {
- /* Dang, there's more than one daemonized PID
- in this group, so we don't know what process
- is the main process. */
- pid = 0;
- break;
- }
-
- pid = npid;
- }
-
- fclose(f);
-
- return pid;
-}
-
-pid_t cgroup_bonding_search_main_pid_list(CGroupBonding *first) {
- CGroupBonding *b;
- pid_t pid;
-
- /* Try to find a main pid from this cgroup, but checking if
- * there's only one PID in the cgroup and returning it. Later
- * on we might want to add additional, smarter heuristics
- * here. */
-
- LIST_FOREACH(by_unit, b, first)
- if ((pid = cgroup_bonding_search_main_pid(b)) != 0)
- return pid;
-
- return 0;
-
-}
~ianmdlvl / elogind.git / blobdiff