1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
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>
32 static int translate_error(int error
, int _errno
) {
36 case ECGROUPNOTCOMPILED
:
37 case ECGROUPNOTMOUNTED
:
39 case ECGROUPNOTCREATED
:
45 case ECGROUPNOTALLOWED
:
55 int cgroup_bonding_realize(CGroupBonding
*b
) {
60 assert(b
->controller
);
65 if (!(b
->cgroup
= cgroup_new_cgroup(b
->path
)))
68 if (!cgroup_add_controller(b
->cgroup
, b
->controller
)) {
74 r
= cgroup_create_cgroup_from_parent(b
->cgroup
, true);
76 r
= cgroup_create_cgroup(b
->cgroup
, true);
79 r
= translate_error(r
, errno
);
86 cgroup_free(&b
->cgroup
);
91 int cgroup_bonding_realize_list(CGroupBonding
*first
) {
94 LIST_FOREACH(by_unit
, b
, first
) {
97 if ((r
= cgroup_bonding_realize(b
)) < 0)
104 void cgroup_bonding_free(CGroupBonding
*b
) {
110 LIST_REMOVE(CGroupBonding
, by_unit
, b
->unit
->meta
.cgroup_bondings
, b
);
112 assert_se(f
= hashmap_get(b
->unit
->meta
.manager
->cgroup_bondings
, b
->path
));
113 LIST_REMOVE(CGroupBonding
, by_path
, f
, b
);
116 hashmap_replace(b
->unit
->meta
.manager
->cgroup_bondings
, b
->path
, f
);
118 hashmap_remove(b
->unit
->meta
.manager
->cgroup_bondings
, b
->path
);
126 if (b
->only_us
&& b
->clean_up
)
127 cgroup_delete_cgroup(b
->cgroup
, true);
129 cgroup_free(&b
->cgroup
);
135 void cgroup_bonding_free_list(CGroupBonding
*first
) {
136 CGroupBonding
*b
, *n
;
138 LIST_FOREACH_SAFE(by_unit
, b
, n
, first
)
139 cgroup_bonding_free(b
);
142 int cgroup_bonding_install(CGroupBonding
*b
, pid_t pid
) {
154 if ((r
= cgroup_attach_task_pid(b
->cgroup
, pid
)))
155 return translate_error(r
, errno
);
160 int cgroup_bonding_install_list(CGroupBonding
*first
, pid_t pid
) {
163 LIST_FOREACH(by_unit
, b
, first
) {
166 if ((r
= cgroup_bonding_install(b
, pid
)) < 0)
173 int cgroup_bonding_kill(CGroupBonding
*b
, int sig
) {
185 if (!(s
= set_new(trivial_hash_func
, trivial_compare_func
)))
188 log_debug("Killing processes from process group %s:%s", b
->controller
, b
->path
);
196 if ((r
= cgroup_get_task_begin(b
->path
, b
->controller
, &iterator
, &pid
)) != 0) {
201 r
= translate_error(r
, errno
);
207 if (set_get(s
, INT_TO_PTR(pid
)) != INT_TO_PTR(pid
)) {
209 /* If we haven't killed this process
212 if (kill(pid
, sig
) < 0 && errno
!= ESRCH
) {
220 if ((r
= set_put(s
, INT_TO_PTR(pid
))) < 0)
224 if ((r
= cgroup_get_task_next(&iterator
, &pid
)) != 0) {
229 r
= translate_error(r
, errno
);
236 assert_se(cgroup_get_task_end(&iterator
) == 0);
238 /* To avoid racing against processes which fork
239 * quicker than we can kill them we repeat this until
240 * no new pids need to be killed. */
242 } while (!done
&& r
>= 0);
249 return killed
? 0 : -ESRCH
;
252 int cgroup_bonding_kill_list(CGroupBonding
*first
, int sig
) {
256 LIST_FOREACH(by_unit
, b
, first
) {
257 if ((r
= cgroup_bonding_kill(b
, sig
)) < 0) {
258 if (r
== -EAGAIN
|| -ESRCH
)
270 /* Returns 1 if the group is empty, 0 if it is not, -EAGAIN if we
272 int cgroup_bonding_is_empty(CGroupBonding
*b
) {
279 r
= cgroup_get_task_begin(b
->path
, b
->controller
, &iterator
, &pid
);
281 if (r
== 0 || r
== ECGEOF
)
282 cgroup_get_task_end(&iterator
);
284 /* Hmm, no PID in this group? Then it is definitely empty */
288 /* Some error? Let's return it */
290 return translate_error(r
, errno
);
292 /* It's not empty, and we are the only user, then it is
293 * definitely not empty */
297 /* There are PIDs in the group but we aren't the only users,
298 * hence we cannot say */
302 int cgroup_bonding_is_empty_list(CGroupBonding
*first
) {
305 LIST_FOREACH(by_unit
, b
, first
) {
308 if ((r
= cgroup_bonding_is_empty(b
)) < 0) {
309 /* If this returned -EAGAIN, then we don't know if the
310 * group is empty, so let's see if another group can
322 static int install_release_agent(Manager
*m
, const char *mount_point
) {
329 if (asprintf(&p
, "%s/release_agent", mount_point
) < 0)
332 if ((r
= read_one_line_file(p
, &c
)) < 0) {
340 if ((r
= write_one_line_file(p
, CGROUP_AGENT_PATH
"\n" )) < 0) {
345 } else if (!streq(sc
, CGROUP_AGENT_PATH
)) {
354 if (asprintf(&p
, "%s/notify_on_release", mount_point
) < 0)
357 if ((r
= read_one_line_file(p
, &c
)) < 0) {
364 if (streq(sc
, "0")) {
365 if ((r
= write_one_line_file(p
, "1\n")) < 0) {
370 } else if (!streq(sc
, "1")) {
382 static int create_hierarchy_cgroup(Manager
*m
) {
388 if (!(cg
= cgroup_new_cgroup(m
->cgroup_hierarchy
)))
391 if (!(cgroup_add_controller(cg
, m
->cgroup_controller
))) {
396 if ((r
= cgroup_create_cgroup(cg
, true)) != 0) {
397 log_error("Failed to create cgroup hierarchy group: %s", cgroup_strerror(r
));
398 r
= translate_error(r
, errno
);
402 if ((r
= cgroup_attach_task(cg
)) != 0) {
403 log_error("Failed to add ourselves to hierarchy group: %s", cgroup_strerror(r
));
404 r
= translate_error(r
, errno
);
415 int manager_setup_cgroup(Manager
*m
) {
422 if ((r
= cgroup_init()) != 0) {
423 log_error("Failed to initialize libcg: %s", cgroup_strerror(r
));
424 return translate_error(r
, errno
);
427 free(m
->cgroup_controller
);
428 if (!(m
->cgroup_controller
= strdup("debug")))
431 if ((r
= cgroup_get_subsys_mount_point(m
->cgroup_controller
, &mp
)))
432 return translate_error(r
, errno
);
436 if ((r
= cgroup_get_current_controller_path(pid
, m
->cgroup_controller
, &cp
))) {
438 return translate_error(r
, errno
);
441 free(m
->cgroup_hierarchy
);
442 m
->cgroup_hierarchy
= NULL
;
443 if (asprintf(&m
->cgroup_hierarchy
, "%s/systemd-%llu", strcmp(cp
, "/") == 0 ? "" : cp
, (unsigned long long) pid
) < 0) {
449 log_info("Using cgroup controller <%s>, hierarchy mounted at <%s>, using root group <%s>.",
450 m
->cgroup_controller
,
452 m
->cgroup_hierarchy
);
454 if ((r
= install_release_agent(m
, mp
)) < 0)
455 log_warning("Failed to install release agent, ignoring: %s", strerror(-r
));
457 log_info("Installed release agent, or already installed.");
462 if ((r
= create_hierarchy_cgroup(m
)) < 0)
463 log_error("Failed to create root cgroup hierarchy: %s", strerror(-r
));
465 log_info("Created root group.");
470 int manager_shutdown_cgroup(Manager
*m
) {
476 if (!m
->cgroup_hierarchy
)
479 if (!(cg
= cgroup_new_cgroup(m
->cgroup_hierarchy
)))
482 if (!(cgroup_add_controller(cg
, m
->cgroup_controller
))) {
487 if ((r
= cgroup_delete_cgroup_ext(cg
, CGFLAG_DELETE_IGNORE_MIGRATION
|CGFLAG_DELETE_RECURSIVE
)) != 0) {
488 log_error("Failed to delete cgroup hierarchy group: %s", cgroup_strerror(r
));
489 r
= translate_error(r
, errno
);
500 int cgroup_notify_empty(Manager
*m
, const char *group
) {
501 CGroupBonding
*l
, *b
;
506 if (!(l
= hashmap_get(m
->cgroup_bondings
, group
)))
509 LIST_FOREACH(by_path
, b
, l
) {
515 if ((t
= cgroup_bonding_is_empty_list(b
)) < 0) {
517 /* If we don't know, we don't know */
519 log_warning("Failed to check whether cgroup is empty: %s", strerror(errno
));
525 if (UNIT_VTABLE(b
->unit
)->cgroup_notify_empty
)
526 UNIT_VTABLE(b
->unit
)->cgroup_notify_empty(b
->unit
);
532 CGroupBonding
*cgroup_bonding_find_list(CGroupBonding
*first
, const char *controller
) {
537 LIST_FOREACH(by_unit
, b
, first
)
538 if (streq(b
->controller
, controller
))