-/*-*- Mode: C; c-basic-offset: 8 -*-*/
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
#include <signal.h>
#include <string.h>
#include <stdlib.h>
-
-#include <libcgroup.h>
+#include <dirent.h>
+#include <sys/stat.h>
+#include <sys/types.h>
#include "cgroup-util.h"
#include "log.h"
#include "macro.h"
#include "util.h"
-/*
- Currently, the only remaining functionality from libcgroup we call
- here is:
-
- - cgroup_get_subsys_mount_point()
- - cgroup_walk_tree_begin()/cgroup_walk_tree_next()
- - cgroup_delete_cgroup_ext()
- */
-
-int cg_translate_error(int error, int _errno) {
-
- switch (error) {
-
- case ECGROUPNOTCOMPILED:
- case ECGROUPNOTMOUNTED:
- case ECGROUPNOTEXIST:
- case ECGROUPNOTCREATED:
- return -ENOENT;
-
- case ECGINVAL:
- return -EINVAL;
-
- case ECGROUPNOTALLOWED:
- return -EPERM;
-
- case ECGOTHER:
- return -_errno;
- }
-
- return -EIO;
-}
-
-static struct cgroup* cg_new(const char *controller, const char *path) {
- struct cgroup *cgroup;
-
- assert(path);
- assert(controller);
-
- if (!(cgroup = cgroup_new_cgroup(path)))
- return NULL;
-
- if (!cgroup_add_controller(cgroup, controller)) {
- cgroup_free(&cgroup);
- return NULL;
- }
-
- return cgroup;
-}
-
int cg_enumerate_processes(const char *controller, const char *path, FILE **_f) {
char *fs;
int r;
return 1;
}
-int cg_kill(const char *controller, const char *path, int sig, bool ignore_self) {
- bool killed = false, done = false;
- Set *s;
- pid_t my_pid;
+int cg_enumerate_subgroups(const char *controller, const char *path, DIR **_d) {
+ char *fs;
+ int r;
+ DIR *d;
+
+ assert(controller);
+ assert(path);
+ assert(_d);
+
+ /* This is not recursive! */
+
+ if ((r = cg_get_path(controller, path, NULL, &fs)) < 0)
+ return r;
+
+ d = opendir(fs);
+ free(fs);
+
+ if (!d)
+ return -errno;
+
+ *_d = d;
+ return 0;
+}
+
+int cg_read_subgroup(DIR *d, char **fn) {
+ struct dirent *de;
+
+ assert(d);
+
+ errno = 0;
+ while ((de = readdir(d))) {
+ char *b;
+
+ if (de->d_type != DT_DIR)
+ continue;
+
+ if (streq(de->d_name, ".") ||
+ streq(de->d_name, ".."))
+ continue;
+
+ if (!(b = strdup(de->d_name)))
+ return -ENOMEM;
+
+ *fn = b;
+ return 1;
+ }
+
+ if (errno)
+ return -errno;
+
+ return 0;
+}
+
+int cg_rmdir(const char *controller, const char *path) {
+ char *p;
+ int r;
+
+ if ((r = cg_get_path(controller, path, NULL, &p)) < 0)
+ return r;
+
+ r = rmdir(p);
+ free(p);
+
+ return r < 0 ? -errno : 0;
+}
+
+int cg_kill(const char *controller, const char *path, int sig, bool sigcont, bool ignore_self, Set *s) {
+ bool done = false;
int r, ret = 0;
+ pid_t my_pid;
FILE *f = NULL;
+ Set *allocated_set = NULL;
assert(controller);
assert(path);
* is repeated until no further processes are added to the
* tasks list, to properly handle forking processes */
- if (!(s = set_new(trivial_hash_func, trivial_compare_func)))
- return -ENOMEM;
+ if (!s)
+ if (!(s = allocated_set = set_new(trivial_hash_func, trivial_compare_func)))
+ return -ENOMEM;
my_pid = getpid();
do {
- pid_t pid;
+ pid_t pid = 0;
done = true;
- if ((r = cg_enumerate_processes(controller, path, &f)) < 0)
+ if ((r = cg_enumerate_processes(controller, path, &f)) < 0) {
+ if (ret >= 0 && r != -ENOENT)
+ ret = r;
+
goto finish;
+ }
while ((r = cg_read_pid(f, &pid)) > 0) {
/* If we haven't killed this process yet, kill
* it */
- if (kill(pid, sig) < 0 && errno != ESRCH) {
- if (ret == 0)
+ if (kill(pid, sig) < 0) {
+ if (ret >= 0 && errno != ESRCH)
ret = -errno;
+ } else if (ret == 0) {
+
+ if (sigcont)
+ kill(pid, SIGCONT);
+
+ ret = 1;
}
- killed = true;
done = false;
- if ((r = set_put(s, LONG_TO_PTR(pid))) < 0)
- break;
+ if ((r = set_put(s, LONG_TO_PTR(pid))) < 0) {
+ if (ret >= 0)
+ ret = r;
+
+ goto finish;
+ }
+ }
+
+ if (r < 0) {
+ if (ret >= 0)
+ ret = r;
+
+ goto finish;
}
fclose(f);
* quicker than we can kill them we repeat this until
* no new pids need to be killed. */
- } while (!done && r >= 0);
+ } while (!done);
finish:
- set_free(s);
+ if (allocated_set)
+ set_free(allocated_set);
if (f)
fclose(f);
- if (r < 0)
- return r;
-
- if (ret < 0)
- return ret;
-
- return !!killed;
+ return ret;
}
-int cg_kill_recursive(const char *controller, const char *path, int sig, bool ignore_self) {
- struct cgroup_file_info info;
- int level = 0, r, ret = 0;
- void *iterator = NULL;
- bool killed = false;
+int cg_kill_recursive(const char *controller, const char *path, int sig, bool sigcont, bool ignore_self, bool rem, Set *s) {
+ int r, ret = 0;
+ DIR *d = NULL;
+ char *fn;
+ Set *allocated_set = NULL;
assert(path);
assert(controller);
assert(sig >= 0);
- zero(info);
+ if (!s)
+ if (!(s = allocated_set = set_new(trivial_hash_func, trivial_compare_func)))
+ return -ENOMEM;
- r = cgroup_walk_tree_begin(controller, path, 0, &iterator, &info, &level);
- while (r == 0) {
- int k;
- char *p;
+ ret = cg_kill(controller, path, sig, sigcont, ignore_self, s);
- if (info.type != CGROUP_FILE_TYPE_DIR)
- goto next;
+ if ((r = cg_enumerate_subgroups(controller, path, &d)) < 0) {
+ if (ret >= 0 && r != -ENOENT)
+ ret = r;
- if (asprintf(&p, "%s/%s", path, info.path) < 0) {
- ret = -ENOMEM;
- break;
+ goto finish;
+ }
+
+ while ((r = cg_read_subgroup(d, &fn)) > 0) {
+ char *p = NULL;
+
+ r = asprintf(&p, "%s/%s", path, fn);
+ free(fn);
+
+ if (r < 0) {
+ if (ret >= 0)
+ ret = -ENOMEM;
+
+ goto finish;
}
- k = cg_kill(controller, p, sig, ignore_self);
+ r = cg_kill_recursive(controller, p, sig, sigcont, ignore_self, rem, s);
free(p);
- if (k < 0) {
- if (ret == 0)
- ret = k;
- } else if (k > 0)
- killed = true;
+ if (r != 0 && ret >= 0)
+ ret = r;
+ }
- next:
+ if (r < 0 && ret >= 0)
+ ret = r;
- r = cgroup_walk_tree_next(0, &iterator, &info, level);
- }
+ if (rem)
+ if ((r = cg_rmdir(controller, path)) < 0) {
+ if (ret >= 0 &&
+ r != -ENOENT &&
+ r != -EBUSY)
+ ret = r;
+ }
- if (ret == 0) {
- if (r == 0 || r == ECGEOF)
- ret = !!killed;
- else if (r == ECGOTHER && errno == ENOENT)
- ret = -ESRCH;
- else
- ret = cg_translate_error(r, errno);
- }
+finish:
+ if (d)
+ closedir(d);
- assert_se(cgroup_walk_tree_end(&iterator) == 0);
+ if (allocated_set)
+ set_free(allocated_set);
return ret;
}
-int cg_kill_recursive_and_wait(const char *controller, const char *path) {
+int cg_kill_recursive_and_wait(const char *controller, const char *path, bool rem) {
unsigned i;
assert(path);
assert(controller);
/* This safely kills all processes; first it sends a SIGTERM,
- * then checks 8 times after 50ms whether the group is
- * now empty, and finally kills everything that is left with
- * SIGKILL */
+ * then checks 8 times after 200ms whether the group is now
+ * empty, then kills everything that is left with SIGKILL and
+ * finally checks 5 times after 200ms each whether the group
+ * is finally empty. */
- for (i = 0; i < 10; i++) {
+ for (i = 0; i < 15; i++) {
int sig, r;
if (i <= 0)
sig = SIGTERM;
- else if (i >= 9)
+ else if (i == 9)
sig = SIGKILL;
else
sig = 0;
- if ((r = cg_kill_recursive(controller, path, sig, true)) <= 0)
+ if ((r = cg_kill_recursive(controller, path, sig, true, true, rem, NULL)) <= 0)
return r;
- usleep(50 * USEC_PER_MSEC);
+ usleep(200 * USEC_PER_MSEC);
}
return 0;
}
int cg_migrate(const char *controller, const char *from, const char *to, bool ignore_self) {
- bool migrated = false, done = false;
+ bool done = false;
+ Set *s;
int r, ret = 0;
pid_t my_pid;
FILE *f = NULL;
assert(from);
assert(to);
+ if (!(s = set_new(trivial_hash_func, trivial_compare_func)))
+ return -ENOMEM;
+
my_pid = getpid();
do {
- pid_t pid;
+ pid_t pid = 0;
done = true;
- if ((r = cg_enumerate_tasks(controller, from, &f)) < 0)
+ if ((r = cg_enumerate_tasks(controller, from, &f)) < 0) {
+ if (ret >= 0 && r != -ENOENT)
+ ret = r;
+
goto finish;
+ }
while ((r = cg_read_pid(f, &pid)) > 0) {
+ /* This might do weird stuff if we aren't a
+ * single-threaded program. However, we
+ * luckily know we are not */
if (pid == my_pid && ignore_self)
continue;
+ if (set_get(s, LONG_TO_PTR(pid)) == LONG_TO_PTR(pid))
+ continue;
+
if ((r = cg_attach(controller, to, pid)) < 0) {
- if (ret == 0)
- ret = -r;
- }
+ if (ret >= 0 && r != -ESRCH)
+ ret = r;
+ } else if (ret == 0)
+ ret = 1;
- migrated = true;
done = false;
+
+ if ((r = set_put(s, LONG_TO_PTR(pid))) < 0) {
+ if (ret >= 0)
+ ret = r;
+
+ goto finish;
+ }
+ }
+
+ if (r < 0) {
+ if (ret >= 0)
+ ret = r;
+
+ goto finish;
}
fclose(f);
f = NULL;
- } while (!done && r >= 0);
+ } while (!done);
finish:
+ set_free(s);
if (f)
fclose(f);
- if (r < 0)
- return r;
-
- if (ret < 0)
- return ret;
-
- return !!migrated;
+ return ret;
}
-int cg_migrate_recursive(const char *controller, const char *from, const char *to, bool ignore_self) {
- struct cgroup_file_info info;
- int level = 0, r, ret = 0;
- void *iterator = NULL;
- bool migrated = false;
+int cg_migrate_recursive(const char *controller, const char *from, const char *to, bool ignore_self, bool rem) {
+ int r, ret = 0;
+ DIR *d = NULL;
+ char *fn;
assert(controller);
assert(from);
assert(to);
- zero(info);
+ ret = cg_migrate(controller, from, to, ignore_self);
- r = cgroup_walk_tree_begin(controller, from, 0, &iterator, &info, &level);
- while (r == 0) {
- int k;
- char *p;
+ if ((r = cg_enumerate_subgroups(controller, from, &d)) < 0) {
+ if (ret >= 0 && r != -ENOENT)
+ ret = r;
+ goto finish;
+ }
+
+ while ((r = cg_read_subgroup(d, &fn)) > 0) {
+ char *p = NULL;
+
+ r = asprintf(&p, "%s/%s", from, fn);
+ free(fn);
- if (info.type != CGROUP_FILE_TYPE_DIR)
- goto next;
+ if (r < 0) {
+ if (ret >= 0)
+ ret = -ENOMEM;
- if (asprintf(&p, "%s/%s", from, info.path) < 0) {
- ret = -ENOMEM;
- break;
+ goto finish;
}
- k = cg_migrate(controller, p, to, ignore_self);
+ r = cg_migrate_recursive(controller, p, to, ignore_self, rem);
free(p);
- if (k < 0) {
- if (ret == 0)
- ret = k;
- } else if (k > 0)
- migrated = true;
-
- next:
- r = cgroup_walk_tree_next(0, &iterator, &info, level);
+ if (r != 0 && ret >= 0)
+ ret = r;
}
- if (ret == 0) {
- if (r == 0 || r == ECGEOF)
- r = !!migrated;
- else if (r == ECGOTHER && errno == ENOENT)
- r = -ESRCH;
- else
- r = cg_translate_error(r, errno);
- }
+ if (r < 0 && ret >= 0)
+ ret = r;
+
+ if (rem)
+ if ((r = cg_rmdir(controller, from)) < 0) {
+ if (ret >= 0 &&
+ r != -ENOENT &&
+ r != -EBUSY)
+ ret = r;
+ }
- assert_se(cgroup_walk_tree_end(&iterator) == 0);
+finish:
+ if (d)
+ closedir(d);
return ret;
}
int cg_get_path(const char *controller, const char *path, const char *suffix, char **fs) {
+ const char *p;
char *mp;
int r;
+ static __thread bool good = false;
assert(controller);
+ assert(fs);
+
+ /* This is a very minimal lookup from controller names to
+ * paths. Since we have mounted most hierarchies ourselves
+ * should be kinda safe, but eventually we might want to
+ * extend this to have a fallback to actually check
+ * /proc/mounts. Might need caching then. */
+
+ if (streq(controller, SYSTEMD_CGROUP_CONTROLLER))
+ p = "systemd";
+ else if (startswith(controller, "name="))
+ p = controller + 5;
+ else
+ p = controller;
+
+ if (asprintf(&mp, "/sys/fs/cgroup/%s", p) < 0)
+ return -ENOMEM;
+
+ if (!good) {
+ if ((r = path_is_mount_point(mp)) <= 0) {
+ free(mp);
+ return r < 0 ? r : -ENOENT;
+ }
- if ((r = cgroup_get_subsys_mount_point(controller, &mp)) != 0)
- return cg_translate_error(r, errno);
+ /* Cache this to save a few stat()s */
+ good = true;
+ }
if (path && suffix)
r = asprintf(fs, "%s/%s/%s", mp, path, suffix);
r = rm_rf(fs, true, delete_root);
free(fs);
- return r;
+ return r == -ENOENT ? 0 : r;
}
int cg_delete(const char *controller, const char *path) {
- struct cgroup *cg;
+ char *parent;
int r;
assert(controller);
assert(path);
- if (!(cg = cg_new(controller, path)))
- return -ENOMEM;
-
- if ((r = cgroup_delete_cgroup_ext(cg, CGFLAG_DELETE_RECURSIVE|CGFLAG_DELETE_IGNORE_MIGRATION)) != 0) {
- r = cg_translate_error(r, errno);
- goto finish;
- }
-
- r = 0;
+ if ((r = parent_of_path(path, &parent)) < 0)
+ return r;
-finish:
- cgroup_free(&cg);
+ r = cg_migrate_recursive(controller, path, parent, false, true);
+ free(parent);
- return r;
+ return r == -ENOENT ? 0 : r;
}
int cg_create(const char *controller, const char *path) {
if ((r = cg_get_path(controller, path, NULL, &fs)) < 0)
return r;
- r = mkdir_p(fs, 0755);
+ r = mkdir_parents(fs, 0755);
+
+ if (r >= 0) {
+ if (mkdir(fs, 0755) >= 0)
+ r = 1;
+ else if (errno == EEXIST)
+ r = 0;
+ else
+ r = -errno;
+ }
+
free(fs);
return r;
}
int cg_create_and_attach(const char *controller, const char *path, pid_t pid) {
- int r;
+ int r, q;
assert(controller);
assert(path);
if ((r = cg_create(controller, path)) < 0)
return r;
- if ((r = cg_attach(controller, path, pid)) < 0)
- return r;
+ if ((q = cg_attach(controller, path, pid)) < 0)
+ return q;
/* This does not remove the cgroup on failure */
f = fopen(fs, "re");
free(fs);
+ if (!f)
+ return errno == ENOENT ? -ESRCH : -errno;
+
cs = strlen(controller);
while (!feof(f)) {
free(fs);
fs = NULL;
- if ((r = cg_get_path(controller, NULL, "notify_on_release", &fs)) < 0) {
- r = -ENOMEM;
+ if ((r = cg_get_path(controller, NULL, "notify_on_release", &fs)) < 0)
goto finish;
- }
free(contents);
contents = NULL;
}
int cg_is_empty(const char *controller, const char *path, bool ignore_self) {
- pid_t pid;
+ pid_t pid = 0;
int r;
- FILE *f;
+ FILE *f = NULL;
bool found = false;
assert(controller);
assert(path);
if ((r = cg_enumerate_tasks(controller, path, &f)) < 0)
- return r;
+ return r == -ENOENT ? 1 : r;
while ((r = cg_read_pid(f, &pid)) > 0) {
}
int cg_is_empty_recursive(const char *controller, const char *path, bool ignore_self) {
- struct cgroup_file_info info;
- int level = 0, r, ret = 0;
- void *iterator = NULL;
- bool empty = true;
+ int r;
+ DIR *d = NULL;
+ char *fn;
assert(controller);
assert(path);
- zero(info);
+ if ((r = cg_is_empty(controller, path, ignore_self)) <= 0)
+ return r;
+
+ if ((r = cg_enumerate_subgroups(controller, path, &d)) < 0)
+ return r == -ENOENT ? 1 : r;
- r = cgroup_walk_tree_begin(controller, path, 0, &iterator, &info, &level);
- while (r == 0) {
- int k;
- char *p;
+ while ((r = cg_read_subgroup(d, &fn)) > 0) {
+ char *p = NULL;
- if (info.type != CGROUP_FILE_TYPE_DIR)
- goto next;
+ r = asprintf(&p, "%s/%s", path, fn);
+ free(fn);
- if (asprintf(&p, "%s/%s", path, info.path) < 0) {
- ret = -ENOMEM;
- break;
+ if (r < 0) {
+ r = -ENOMEM;
+ goto finish;
}
- k = cg_is_empty(controller, p, ignore_self);
+ r = cg_is_empty_recursive(controller, p, ignore_self);
free(p);
- if (k < 0) {
- ret = k;
- break;
- } else if (k == 0) {
- empty = false;
- break;
+ if (r <= 0)
+ goto finish;
+ }
+
+ if (r >= 0)
+ r = 1;
+
+finish:
+
+ if (d)
+ closedir(d);
+
+ return r;
+}
+
+int cg_split_spec(const char *spec, char **controller, char **path) {
+ const char *e;
+ char *t = NULL, *u = NULL;
+
+ assert(spec);
+ assert(controller || path);
+
+ if (*spec == '/') {
+
+ if (path) {
+ if (!(t = strdup(spec)))
+ return -ENOMEM;
+
+ *path = t;
}
- next:
- r = cgroup_walk_tree_next(0, &iterator, &info, level);
+ if (controller)
+ *controller = NULL;
+
+ return 0;
}
- if (ret == 0) {
- if (r == 0 || r == ECGEOF)
- ret = !!empty;
- else if (r == ECGOTHER && errno == ENOENT)
- ret = -ESRCH;
- else
- ret = cg_translate_error(r, errno);
+ if (!(e = strchr(spec, ':'))) {
+
+ if (strchr(spec, '/') || spec[0] == 0)
+ return -EINVAL;
+
+ if (controller) {
+ if (!(t = strdup(spec)))
+ return -ENOMEM;
+
+ *controller = t;
+ }
+
+ if (path)
+ *path = NULL;
+
+ return 0;
}
- assert_se(cgroup_walk_tree_end(&iterator) == 0);
+ if (e[1] != '/' ||
+ e == spec ||
+ memchr(spec, '/', e-spec))
+ return -EINVAL;
- return ret;
+ if (controller)
+ if (!(t = strndup(spec, e-spec)))
+ return -ENOMEM;
+
+ if (path)
+ if (!(u = strdup(e+1))) {
+ free(t);
+ return -ENOMEM;
+ }
+
+ if (controller)
+ *controller = t;
+
+ if (path)
+ *path = u;
+
+ return 0;
}
-int cg_init(void) {
+int cg_join_spec(const char *controller, const char *path, char **spec) {
+ assert(controller);
+ assert(path);
+
+ if (!path_is_absolute(path) ||
+ controller[0] == 0 ||
+ strchr(controller, ':') ||
+ strchr(controller, '/'))
+ return -EINVAL;
+
+ if (asprintf(spec, "%s:%s", controller, path) < 0)
+ return -ENOMEM;
+
+ return 0;
+}
+
+int cg_fix_path(const char *path, char **result) {
+ char *t, *c, *p;
int r;
- if ((r = cgroup_init()) != 0)
- return cg_translate_error(r, errno);
+ assert(path);
+ assert(result);
+
+ /* First check if it already is a filesystem path */
+ if (path_is_absolute(path) &&
+ path_startswith(path, "/sys/fs/cgroup") &&
+ access(path, F_OK) >= 0) {
+
+ if (!(t = strdup(path)))
+ return -ENOMEM;
+
+ *result = t;
+ return 0;
+ }
+
+ /* Otherwise treat it as cg spec */
+ if ((r = cg_split_spec(path, &c, &p)) < 0)
+ return r;
+
+ r = cg_get_path(c ? c : SYSTEMD_CGROUP_CONTROLLER, p ? p : "/", NULL, result);
+ free(c);
+ free(p);
+
+ return r;
+}
+
+int cg_get_user_path(char **path) {
+ char *root, *p;
+
+ assert(path);
+
+ /* Figure out the place to put user cgroups below. We use the
+ * same as PID 1 has but with the "/system" suffix replaced by
+ * "/user" */
+
+ if (cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 1, &root) < 0)
+ p = strdup("/user");
+ else {
+ if (endswith(root, "/system"))
+ root[strlen(root) - 7] = 0;
+ else if (streq(root, "/"))
+ root[0] = 0;
+
+ p = strappend(root, "/user");
+ free(root);
+ }
+
+ if (!p)
+ return -ENOMEM;
+ *path = p;
return 0;
}
~ianmdlvl / elogind.git / blobdiff