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-rw-r--r--src/libsystemd-basic/src/cgroup-util.c2541
1 files changed, 2541 insertions, 0 deletions
diff --git a/src/libsystemd-basic/src/cgroup-util.c b/src/libsystemd-basic/src/cgroup-util.c
new file mode 100644
index 0000000000..cf9c682599
--- /dev/null
+++ b/src/libsystemd-basic/src/cgroup-util.c
@@ -0,0 +1,2541 @@
+/***
+ 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 Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <dirent.h>
+#include <errno.h>
+#include <ftw.h>
+#include <limits.h>
+#include <signal.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/statfs.h>
+#include <sys/types.h>
+#include <sys/xattr.h>
+#include <unistd.h>
+
+#include "systemd-basic/alloc-util.h"
+#include "systemd-basic/cgroup-util.h"
+#include "systemd-basic/def.h"
+#include "systemd-basic/dirent-util.h"
+#include "systemd-basic/extract-word.h"
+#include "systemd-basic/fd-util.h"
+#include "systemd-basic/fileio.h"
+#include "systemd-basic/formats-util.h"
+#include "systemd-basic/fs-util.h"
+#include "systemd-basic/log.h"
+#include "systemd-basic/login-util.h"
+#include "systemd-basic/macro.h"
+#include "systemd-basic/missing.h"
+#include "systemd-basic/mkdir.h"
+#include "systemd-basic/parse-util.h"
+#include "systemd-basic/path-util.h"
+#include "systemd-basic/proc-cmdline.h"
+#include "systemd-basic/process-util.h"
+#include "systemd-basic/set.h"
+#include "systemd-basic/special.h"
+#include "systemd-basic/stat-util.h"
+#include "systemd-basic/stdio-util.h"
+#include "systemd-basic/string-table.h"
+#include "systemd-basic/string-util.h"
+#include "systemd-basic/unit-name.h"
+#include "systemd-basic/user-util.h"
+
+int cg_enumerate_processes(const char *controller, const char *path, FILE **_f) {
+ _cleanup_free_ char *fs = NULL;
+ FILE *f;
+ int r;
+
+ assert(_f);
+
+ r = cg_get_path(controller, path, "cgroup.procs", &fs);
+ if (r < 0)
+ return r;
+
+ f = fopen(fs, "re");
+ if (!f)
+ return -errno;
+
+ *_f = f;
+ return 0;
+}
+
+int cg_read_pid(FILE *f, pid_t *_pid) {
+ unsigned long ul;
+
+ /* Note that the cgroup.procs might contain duplicates! See
+ * cgroups.txt for details. */
+
+ assert(f);
+ assert(_pid);
+
+ errno = 0;
+ if (fscanf(f, "%lu", &ul) != 1) {
+
+ if (feof(f))
+ return 0;
+
+ return errno > 0 ? -errno : -EIO;
+ }
+
+ if (ul <= 0)
+ return -EIO;
+
+ *_pid = (pid_t) ul;
+ return 1;
+}
+
+int cg_read_event(const char *controller, const char *path, const char *event,
+ char **val)
+{
+ _cleanup_free_ char *events = NULL, *content = NULL;
+ char *p, *line;
+ int r;
+
+ r = cg_get_path(controller, path, "cgroup.events", &events);
+ if (r < 0)
+ return r;
+
+ r = read_full_file(events, &content, NULL);
+ if (r < 0)
+ return r;
+
+ p = content;
+ while ((line = strsep(&p, "\n"))) {
+ char *key;
+
+ key = strsep(&line, " ");
+ if (!key || !line)
+ return -EINVAL;
+
+ if (strcmp(key, event))
+ continue;
+
+ *val = strdup(line);
+ return 0;
+ }
+
+ return -ENOENT;
+}
+
+bool cg_ns_supported(void) {
+ static thread_local int enabled = -1;
+
+ if (enabled >= 0)
+ return enabled;
+
+ if (access("/proc/self/ns/cgroup", F_OK) == 0)
+ enabled = 1;
+ else
+ enabled = 0;
+
+ return enabled;
+}
+
+int cg_enumerate_subgroups(const char *controller, const char *path, DIR **_d) {
+ _cleanup_free_ char *fs = NULL;
+ int r;
+ DIR *d;
+
+ assert(_d);
+
+ /* This is not recursive! */
+
+ r = cg_get_path(controller, path, NULL, &fs);
+ if (r < 0)
+ return r;
+
+ d = opendir(fs);
+ if (!d)
+ return -errno;
+
+ *_d = d;
+ return 0;
+}
+
+int cg_read_subgroup(DIR *d, char **fn) {
+ struct dirent *de;
+
+ assert(d);
+ assert(fn);
+
+ FOREACH_DIRENT_ALL(de, d, return -errno) {
+ char *b;
+
+ if (de->d_type != DT_DIR)
+ continue;
+
+ if (streq(de->d_name, ".") ||
+ streq(de->d_name, ".."))
+ continue;
+
+ b = strdup(de->d_name);
+ if (!b)
+ return -ENOMEM;
+
+ *fn = b;
+ return 1;
+ }
+
+ return 0;
+}
+
+int cg_rmdir(const char *controller, const char *path) {
+ _cleanup_free_ char *p = NULL;
+ int r;
+
+ r = cg_get_path(controller, path, NULL, &p);
+ if (r < 0)
+ return r;
+
+ r = rmdir(p);
+ if (r < 0 && errno != ENOENT)
+ return -errno;
+
+ return 0;
+}
+
+int cg_kill(
+ const char *controller,
+ const char *path,
+ int sig,
+ CGroupFlags flags,
+ Set *s,
+ cg_kill_log_func_t log_kill,
+ void *userdata) {
+
+ _cleanup_set_free_ Set *allocated_set = NULL;
+ bool done = false;
+ int r, ret = 0;
+ pid_t my_pid;
+
+ assert(sig >= 0);
+
+ /* Don't send SIGCONT twice. Also, SIGKILL always works even when process is suspended, hence don't send
+ * SIGCONT on SIGKILL. */
+ if (IN_SET(sig, SIGCONT, SIGKILL))
+ flags &= ~CGROUP_SIGCONT;
+
+ /* This goes through the tasks list and kills them all. This
+ * is repeated until no further processes are added to the
+ * tasks list, to properly handle forking processes */
+
+ if (!s) {
+ s = allocated_set = set_new(NULL);
+ if (!s)
+ return -ENOMEM;
+ }
+
+ my_pid = getpid();
+
+ do {
+ _cleanup_fclose_ FILE *f = NULL;
+ pid_t pid = 0;
+ done = true;
+
+ r = cg_enumerate_processes(controller, path, &f);
+ if (r < 0) {
+ if (ret >= 0 && r != -ENOENT)
+ return r;
+
+ return ret;
+ }
+
+ while ((r = cg_read_pid(f, &pid)) > 0) {
+
+ if ((flags & CGROUP_IGNORE_SELF) && pid == my_pid)
+ continue;
+
+ if (set_get(s, PID_TO_PTR(pid)) == PID_TO_PTR(pid))
+ continue;
+
+ if (log_kill)
+ log_kill(pid, sig, userdata);
+
+ /* If we haven't killed this process yet, kill
+ * it */
+ if (kill(pid, sig) < 0) {
+ if (ret >= 0 && errno != ESRCH)
+ ret = -errno;
+ } else {
+ if (flags & CGROUP_SIGCONT)
+ (void) kill(pid, SIGCONT);
+
+ if (ret == 0)
+ ret = 1;
+ }
+
+ done = false;
+
+ r = set_put(s, PID_TO_PTR(pid));
+ if (r < 0) {
+ if (ret >= 0)
+ return r;
+
+ return ret;
+ }
+ }
+
+ if (r < 0) {
+ if (ret >= 0)
+ return r;
+
+ return ret;
+ }
+
+ /* To avoid racing against processes which fork
+ * quicker than we can kill them we repeat this until
+ * no new pids need to be killed. */
+
+ } while (!done);
+
+ return ret;
+}
+
+int cg_kill_recursive(
+ const char *controller,
+ const char *path,
+ int sig,
+ CGroupFlags flags,
+ Set *s,
+ cg_kill_log_func_t log_kill,
+ void *userdata) {
+
+ _cleanup_set_free_ Set *allocated_set = NULL;
+ _cleanup_closedir_ DIR *d = NULL;
+ int r, ret;
+ char *fn;
+
+ assert(path);
+ assert(sig >= 0);
+
+ if (!s) {
+ s = allocated_set = set_new(NULL);
+ if (!s)
+ return -ENOMEM;
+ }
+
+ ret = cg_kill(controller, path, sig, flags, s, log_kill, userdata);
+
+ r = cg_enumerate_subgroups(controller, path, &d);
+ if (r < 0) {
+ if (ret >= 0 && r != -ENOENT)
+ return r;
+
+ return ret;
+ }
+
+ while ((r = cg_read_subgroup(d, &fn)) > 0) {
+ _cleanup_free_ char *p = NULL;
+
+ p = strjoin(path, "/", fn, NULL);
+ free(fn);
+ if (!p)
+ return -ENOMEM;
+
+ r = cg_kill_recursive(controller, p, sig, flags, s, log_kill, userdata);
+ if (r != 0 && ret >= 0)
+ ret = r;
+ }
+ if (ret >= 0 && r < 0)
+ ret = r;
+
+ if (flags & CGROUP_REMOVE) {
+ r = cg_rmdir(controller, path);
+ if (r < 0 && ret >= 0 && r != -ENOENT && r != -EBUSY)
+ return r;
+ }
+
+ return ret;
+}
+
+int cg_migrate(
+ const char *cfrom,
+ const char *pfrom,
+ const char *cto,
+ const char *pto,
+ CGroupFlags flags) {
+
+ bool done = false;
+ _cleanup_set_free_ Set *s = NULL;
+ int r, ret = 0;
+ pid_t my_pid;
+
+ assert(cfrom);
+ assert(pfrom);
+ assert(cto);
+ assert(pto);
+
+ s = set_new(NULL);
+ if (!s)
+ return -ENOMEM;
+
+ my_pid = getpid();
+
+ do {
+ _cleanup_fclose_ FILE *f = NULL;
+ pid_t pid = 0;
+ done = true;
+
+ r = cg_enumerate_processes(cfrom, pfrom, &f);
+ if (r < 0) {
+ if (ret >= 0 && r != -ENOENT)
+ return r;
+
+ return ret;
+ }
+
+ 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 ((flags & CGROUP_IGNORE_SELF) && pid == my_pid)
+ continue;
+
+ if (set_get(s, PID_TO_PTR(pid)) == PID_TO_PTR(pid))
+ continue;
+
+ /* Ignore kernel threads. Since they can only
+ * exist in the root cgroup, we only check for
+ * them there. */
+ if (cfrom &&
+ (isempty(pfrom) || path_equal(pfrom, "/")) &&
+ is_kernel_thread(pid) > 0)
+ continue;
+
+ r = cg_attach(cto, pto, pid);
+ if (r < 0) {
+ if (ret >= 0 && r != -ESRCH)
+ ret = r;
+ } else if (ret == 0)
+ ret = 1;
+
+ done = false;
+
+ r = set_put(s, PID_TO_PTR(pid));
+ if (r < 0) {
+ if (ret >= 0)
+ return r;
+
+ return ret;
+ }
+ }
+
+ if (r < 0) {
+ if (ret >= 0)
+ return r;
+
+ return ret;
+ }
+ } while (!done);
+
+ return ret;
+}
+
+int cg_migrate_recursive(
+ const char *cfrom,
+ const char *pfrom,
+ const char *cto,
+ const char *pto,
+ CGroupFlags flags) {
+
+ _cleanup_closedir_ DIR *d = NULL;
+ int r, ret = 0;
+ char *fn;
+
+ assert(cfrom);
+ assert(pfrom);
+ assert(cto);
+ assert(pto);
+
+ ret = cg_migrate(cfrom, pfrom, cto, pto, flags);
+
+ r = cg_enumerate_subgroups(cfrom, pfrom, &d);
+ if (r < 0) {
+ if (ret >= 0 && r != -ENOENT)
+ return r;
+
+ return ret;
+ }
+
+ while ((r = cg_read_subgroup(d, &fn)) > 0) {
+ _cleanup_free_ char *p = NULL;
+
+ p = strjoin(pfrom, "/", fn, NULL);
+ free(fn);
+ if (!p)
+ return -ENOMEM;
+
+ r = cg_migrate_recursive(cfrom, p, cto, pto, flags);
+ if (r != 0 && ret >= 0)
+ ret = r;
+ }
+
+ if (r < 0 && ret >= 0)
+ ret = r;
+
+ if (flags & CGROUP_REMOVE) {
+ r = cg_rmdir(cfrom, pfrom);
+ if (r < 0 && ret >= 0 && r != -ENOENT && r != -EBUSY)
+ return r;
+ }
+
+ return ret;
+}
+
+int cg_migrate_recursive_fallback(
+ const char *cfrom,
+ const char *pfrom,
+ const char *cto,
+ const char *pto,
+ CGroupFlags flags) {
+
+ int r;
+
+ assert(cfrom);
+ assert(pfrom);
+ assert(cto);
+ assert(pto);
+
+ r = cg_migrate_recursive(cfrom, pfrom, cto, pto, flags);
+ if (r < 0) {
+ char prefix[strlen(pto) + 1];
+
+ /* This didn't work? Then let's try all prefixes of the destination */
+
+ PATH_FOREACH_PREFIX(prefix, pto) {
+ int q;
+
+ q = cg_migrate_recursive(cfrom, pfrom, cto, prefix, flags);
+ if (q >= 0)
+ return q;
+ }
+ }
+
+ return r;
+}
+
+static const char *controller_to_dirname(const char *controller) {
+ const char *e;
+
+ assert(controller);
+
+ /* Converts a controller name to the directory name below
+ * /sys/fs/cgroup/ we want to mount it to. Effectively, this
+ * just cuts off the name= prefixed used for named
+ * hierarchies, if it is specified. */
+
+ e = startswith(controller, "name=");
+ if (e)
+ return e;
+
+ return controller;
+}
+
+static int join_path_legacy(const char *controller, const char *path, const char *suffix, char **fs) {
+ const char *dn;
+ char *t = NULL;
+
+ assert(fs);
+ assert(controller);
+
+ dn = controller_to_dirname(controller);
+
+ if (isempty(path) && isempty(suffix))
+ t = strappend("/sys/fs/cgroup/", dn);
+ else if (isempty(path))
+ t = strjoin("/sys/fs/cgroup/", dn, "/", suffix, NULL);
+ else if (isempty(suffix))
+ t = strjoin("/sys/fs/cgroup/", dn, "/", path, NULL);
+ else
+ t = strjoin("/sys/fs/cgroup/", dn, "/", path, "/", suffix, NULL);
+ if (!t)
+ return -ENOMEM;
+
+ *fs = t;
+ return 0;
+}
+
+static int join_path_unified(const char *path, const char *suffix, char **fs) {
+ char *t;
+
+ assert(fs);
+
+ if (isempty(path) && isempty(suffix))
+ t = strdup("/sys/fs/cgroup");
+ else if (isempty(path))
+ t = strappend("/sys/fs/cgroup/", suffix);
+ else if (isempty(suffix))
+ t = strappend("/sys/fs/cgroup/", path);
+ else
+ t = strjoin("/sys/fs/cgroup/", path, "/", suffix, NULL);
+ if (!t)
+ return -ENOMEM;
+
+ *fs = t;
+ return 0;
+}
+
+int cg_get_path(const char *controller, const char *path, const char *suffix, char **fs) {
+ int unified, r;
+
+ assert(fs);
+
+ if (!controller) {
+ char *t;
+
+ /* If no controller is specified, we return the path
+ * *below* the controllers, without any prefix. */
+
+ if (!path && !suffix)
+ return -EINVAL;
+
+ if (!suffix)
+ t = strdup(path);
+ else if (!path)
+ t = strdup(suffix);
+ else
+ t = strjoin(path, "/", suffix, NULL);
+ if (!t)
+ return -ENOMEM;
+
+ *fs = path_kill_slashes(t);
+ return 0;
+ }
+
+ if (!cg_controller_is_valid(controller))
+ return -EINVAL;
+
+ unified = cg_all_unified();
+ if (unified < 0)
+ return unified;
+
+ if (unified > 0)
+ r = join_path_unified(path, suffix, fs);
+ else
+ r = join_path_legacy(controller, path, suffix, fs);
+ if (r < 0)
+ return r;
+
+ path_kill_slashes(*fs);
+ return 0;
+}
+
+static int controller_is_accessible(const char *controller) {
+ int unified;
+
+ assert(controller);
+
+ /* Checks whether a specific controller is accessible,
+ * i.e. its hierarchy mounted. In the unified hierarchy all
+ * controllers are considered accessible, except for the named
+ * hierarchies */
+
+ if (!cg_controller_is_valid(controller))
+ return -EINVAL;
+
+ unified = cg_all_unified();
+ if (unified < 0)
+ return unified;
+ if (unified > 0) {
+ /* We don't support named hierarchies if we are using
+ * the unified hierarchy. */
+
+ if (streq(controller, SYSTEMD_CGROUP_CONTROLLER))
+ return 0;
+
+ if (startswith(controller, "name="))
+ return -EOPNOTSUPP;
+
+ } else {
+ const char *cc, *dn;
+
+ dn = controller_to_dirname(controller);
+ cc = strjoina("/sys/fs/cgroup/", dn);
+
+ if (laccess(cc, F_OK) < 0)
+ return -errno;
+ }
+
+ return 0;
+}
+
+int cg_get_path_and_check(const char *controller, const char *path, const char *suffix, char **fs) {
+ int r;
+
+ assert(controller);
+ assert(fs);
+
+ /* Check if the specified controller is actually accessible */
+ r = controller_is_accessible(controller);
+ if (r < 0)
+ return r;
+
+ return cg_get_path(controller, path, suffix, fs);
+}
+
+static int trim_cb(const char *path, const struct stat *sb, int typeflag, struct FTW *ftwbuf) {
+ assert(path);
+ assert(sb);
+ assert(ftwbuf);
+
+ if (typeflag != FTW_DP)
+ return 0;
+
+ if (ftwbuf->level < 1)
+ return 0;
+
+ (void) rmdir(path);
+ return 0;
+}
+
+int cg_trim(const char *controller, const char *path, bool delete_root) {
+ _cleanup_free_ char *fs = NULL;
+ int r = 0;
+
+ assert(path);
+
+ r = cg_get_path(controller, path, NULL, &fs);
+ if (r < 0)
+ return r;
+
+ errno = 0;
+ if (nftw(fs, trim_cb, 64, FTW_DEPTH|FTW_MOUNT|FTW_PHYS) != 0) {
+ if (errno == ENOENT)
+ r = 0;
+ else if (errno > 0)
+ r = -errno;
+ else
+ r = -EIO;
+ }
+
+ if (delete_root) {
+ if (rmdir(fs) < 0 && errno != ENOENT)
+ return -errno;
+ }
+
+ return r;
+}
+
+int cg_create(const char *controller, const char *path) {
+ _cleanup_free_ char *fs = NULL;
+ int r;
+
+ r = cg_get_path_and_check(controller, path, NULL, &fs);
+ if (r < 0)
+ return r;
+
+ r = mkdir_parents(fs, 0755);
+ if (r < 0)
+ return r;
+
+ if (mkdir(fs, 0755) < 0) {
+
+ if (errno == EEXIST)
+ return 0;
+
+ return -errno;
+ }
+
+ return 1;
+}
+
+int cg_create_and_attach(const char *controller, const char *path, pid_t pid) {
+ int r, q;
+
+ assert(pid >= 0);
+
+ r = cg_create(controller, path);
+ if (r < 0)
+ return r;
+
+ q = cg_attach(controller, path, pid);
+ if (q < 0)
+ return q;
+
+ /* This does not remove the cgroup on failure */
+ return r;
+}
+
+int cg_attach(const char *controller, const char *path, pid_t pid) {
+ _cleanup_free_ char *fs = NULL;
+ char c[DECIMAL_STR_MAX(pid_t) + 2];
+ int r;
+
+ assert(path);
+ assert(pid >= 0);
+
+ r = cg_get_path_and_check(controller, path, "cgroup.procs", &fs);
+ if (r < 0)
+ return r;
+
+ if (pid == 0)
+ pid = getpid();
+
+ xsprintf(c, PID_FMT "\n", pid);
+
+ return write_string_file(fs, c, 0);
+}
+
+int cg_attach_fallback(const char *controller, const char *path, pid_t pid) {
+ int r;
+
+ assert(controller);
+ assert(path);
+ assert(pid >= 0);
+
+ r = cg_attach(controller, path, pid);
+ if (r < 0) {
+ char prefix[strlen(path) + 1];
+
+ /* This didn't work? Then let's try all prefixes of
+ * the destination */
+
+ PATH_FOREACH_PREFIX(prefix, path) {
+ int q;
+
+ q = cg_attach(controller, prefix, pid);
+ if (q >= 0)
+ return q;
+ }
+ }
+
+ return r;
+}
+
+int cg_set_group_access(
+ const char *controller,
+ const char *path,
+ mode_t mode,
+ uid_t uid,
+ gid_t gid) {
+
+ _cleanup_free_ char *fs = NULL;
+ int r;
+
+ if (mode == MODE_INVALID && uid == UID_INVALID && gid == GID_INVALID)
+ return 0;
+
+ if (mode != MODE_INVALID)
+ mode &= 0777;
+
+ r = cg_get_path(controller, path, NULL, &fs);
+ if (r < 0)
+ return r;
+
+ return chmod_and_chown(fs, mode, uid, gid);
+}
+
+int cg_set_task_access(
+ const char *controller,
+ const char *path,
+ mode_t mode,
+ uid_t uid,
+ gid_t gid) {
+
+ _cleanup_free_ char *fs = NULL, *procs = NULL;
+ int r, unified;
+
+ assert(path);
+
+ if (mode == MODE_INVALID && uid == UID_INVALID && gid == GID_INVALID)
+ return 0;
+
+ if (mode != MODE_INVALID)
+ mode &= 0666;
+
+ r = cg_get_path(controller, path, "cgroup.procs", &fs);
+ if (r < 0)
+ return r;
+
+ r = chmod_and_chown(fs, mode, uid, gid);
+ if (r < 0)
+ return r;
+
+ unified = cg_unified(controller);
+ if (unified < 0)
+ return unified;
+ if (unified)
+ return 0;
+
+ /* Compatibility, Always keep values for "tasks" in sync with
+ * "cgroup.procs" */
+ if (cg_get_path(controller, path, "tasks", &procs) >= 0)
+ (void) chmod_and_chown(procs, mode, uid, gid);
+
+ return 0;
+}
+
+int cg_set_xattr(const char *controller, const char *path, const char *name, const void *value, size_t size, int flags) {
+ _cleanup_free_ char *fs = NULL;
+ int r;
+
+ assert(path);
+ assert(name);
+ assert(value || size <= 0);
+
+ r = cg_get_path(controller, path, NULL, &fs);
+ if (r < 0)
+ return r;
+
+ if (setxattr(fs, name, value, size, flags) < 0)
+ return -errno;
+
+ return 0;
+}
+
+int cg_get_xattr(const char *controller, const char *path, const char *name, void *value, size_t size) {
+ _cleanup_free_ char *fs = NULL;
+ ssize_t n;
+ int r;
+
+ assert(path);
+ assert(name);
+
+ r = cg_get_path(controller, path, NULL, &fs);
+ if (r < 0)
+ return r;
+
+ n = getxattr(fs, name, value, size);
+ if (n < 0)
+ return -errno;
+
+ return (int) n;
+}
+
+int cg_pid_get_path(const char *controller, pid_t pid, char **path) {
+ _cleanup_fclose_ FILE *f = NULL;
+ char line[LINE_MAX];
+ const char *fs;
+ size_t cs = 0;
+ int unified;
+
+ assert(path);
+ assert(pid >= 0);
+
+ if (controller) {
+ if (!cg_controller_is_valid(controller))
+ return -EINVAL;
+ } else
+ controller = SYSTEMD_CGROUP_CONTROLLER;
+
+ unified = cg_unified(controller);
+ if (unified < 0)
+ return unified;
+ if (unified == 0)
+ cs = strlen(controller);
+
+ fs = procfs_file_alloca(pid, "cgroup");
+ f = fopen(fs, "re");
+ if (!f)
+ return errno == ENOENT ? -ESRCH : -errno;
+
+ FOREACH_LINE(line, f, return -errno) {
+ char *e, *p;
+
+ truncate_nl(line);
+
+ if (unified) {
+ e = startswith(line, "0:");
+ if (!e)
+ continue;
+
+ e = strchr(e, ':');
+ if (!e)
+ continue;
+ } else {
+ char *l;
+ size_t k;
+ const char *word, *state;
+ bool found = false;
+
+ l = strchr(line, ':');
+ if (!l)
+ continue;
+
+ l++;
+ e = strchr(l, ':');
+ if (!e)
+ continue;
+
+ *e = 0;
+ FOREACH_WORD_SEPARATOR(word, k, l, ",", state) {
+ if (k == cs && memcmp(word, controller, cs) == 0) {
+ found = true;
+ break;
+ }
+ }
+
+ if (!found)
+ continue;
+ }
+
+ p = strdup(e + 1);
+ if (!p)
+ return -ENOMEM;
+
+ *path = p;
+ return 0;
+ }
+
+ return -ENODATA;
+}
+
+int cg_install_release_agent(const char *controller, const char *agent) {
+ _cleanup_free_ char *fs = NULL, *contents = NULL;
+ const char *sc;
+ int r, unified;
+
+ assert(agent);
+
+ unified = cg_unified(controller);
+ if (unified < 0)
+ return unified;
+ if (unified) /* doesn't apply to unified hierarchy */
+ return -EOPNOTSUPP;
+
+ r = cg_get_path(controller, NULL, "release_agent", &fs);
+ if (r < 0)
+ return r;
+
+ r = read_one_line_file(fs, &contents);
+ if (r < 0)
+ return r;
+
+ sc = strstrip(contents);
+ if (isempty(sc)) {
+ r = write_string_file(fs, agent, 0);
+ if (r < 0)
+ return r;
+ } else if (!path_equal(sc, agent))
+ return -EEXIST;
+
+ fs = mfree(fs);
+ r = cg_get_path(controller, NULL, "notify_on_release", &fs);
+ if (r < 0)
+ return r;
+
+ contents = mfree(contents);
+ r = read_one_line_file(fs, &contents);
+ if (r < 0)
+ return r;
+
+ sc = strstrip(contents);
+ if (streq(sc, "0")) {
+ r = write_string_file(fs, "1", 0);
+ if (r < 0)
+ return r;
+
+ return 1;
+ }
+
+ if (!streq(sc, "1"))
+ return -EIO;
+
+ return 0;
+}
+
+int cg_uninstall_release_agent(const char *controller) {
+ _cleanup_free_ char *fs = NULL;
+ int r, unified;
+
+ unified = cg_unified(controller);
+ if (unified < 0)
+ return unified;
+ if (unified) /* Doesn't apply to unified hierarchy */
+ return -EOPNOTSUPP;
+
+ r = cg_get_path(controller, NULL, "notify_on_release", &fs);
+ if (r < 0)
+ return r;
+
+ r = write_string_file(fs, "0", 0);
+ if (r < 0)
+ return r;
+
+ fs = mfree(fs);
+
+ r = cg_get_path(controller, NULL, "release_agent", &fs);
+ if (r < 0)
+ return r;
+
+ r = write_string_file(fs, "", 0);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+int cg_is_empty(const char *controller, const char *path) {
+ _cleanup_fclose_ FILE *f = NULL;
+ pid_t pid;
+ int r;
+
+ assert(path);
+
+ r = cg_enumerate_processes(controller, path, &f);
+ if (r == -ENOENT)
+ return 1;
+ if (r < 0)
+ return r;
+
+ r = cg_read_pid(f, &pid);
+ if (r < 0)
+ return r;
+
+ return r == 0;
+}
+
+int cg_is_empty_recursive(const char *controller, const char *path) {
+ int unified, r;
+
+ assert(path);
+
+ /* The root cgroup is always populated */
+ if (controller && (isempty(path) || path_equal(path, "/")))
+ return false;
+
+ unified = cg_unified(controller);
+ if (unified < 0)
+ return unified;
+
+ if (unified > 0) {
+ _cleanup_free_ char *t = NULL;
+
+ /* On the unified hierarchy we can check empty state
+ * via the "populated" attribute of "cgroup.events". */
+
+ r = cg_read_event(controller, path, "populated", &t);
+ if (r < 0)
+ return r;
+
+ return streq(t, "0");
+ } else {
+ _cleanup_closedir_ DIR *d = NULL;
+ char *fn;
+
+ r = cg_is_empty(controller, path);
+ if (r <= 0)
+ return r;
+
+ r = cg_enumerate_subgroups(controller, path, &d);
+ if (r == -ENOENT)
+ return 1;
+ if (r < 0)
+ return r;
+
+ while ((r = cg_read_subgroup(d, &fn)) > 0) {
+ _cleanup_free_ char *p = NULL;
+
+ p = strjoin(path, "/", fn, NULL);
+ free(fn);
+ if (!p)
+ return -ENOMEM;
+
+ r = cg_is_empty_recursive(controller, p);
+ if (r <= 0)
+ return r;
+ }
+ if (r < 0)
+ return r;
+
+ return true;
+ }
+}
+
+int cg_split_spec(const char *spec, char **controller, char **path) {
+ char *t = NULL, *u = NULL;
+ const char *e;
+
+ assert(spec);
+
+ if (*spec == '/') {
+ if (!path_is_safe(spec))
+ return -EINVAL;
+
+ if (path) {
+ t = strdup(spec);
+ if (!t)
+ return -ENOMEM;
+
+ *path = path_kill_slashes(t);
+ }
+
+ if (controller)
+ *controller = NULL;
+
+ return 0;
+ }
+
+ e = strchr(spec, ':');
+ if (!e) {
+ if (!cg_controller_is_valid(spec))
+ return -EINVAL;
+
+ if (controller) {
+ t = strdup(spec);
+ if (!t)
+ return -ENOMEM;
+
+ *controller = t;
+ }
+
+ if (path)
+ *path = NULL;
+
+ return 0;
+ }
+
+ t = strndup(spec, e-spec);
+ if (!t)
+ return -ENOMEM;
+ if (!cg_controller_is_valid(t)) {
+ free(t);
+ return -EINVAL;
+ }
+
+ if (isempty(e+1))
+ u = NULL;
+ else {
+ u = strdup(e+1);
+ if (!u) {
+ free(t);
+ return -ENOMEM;
+ }
+
+ if (!path_is_safe(u) ||
+ !path_is_absolute(u)) {
+ free(t);
+ free(u);
+ return -EINVAL;
+ }
+
+ path_kill_slashes(u);
+ }
+
+ if (controller)
+ *controller = t;
+ else
+ free(t);
+
+ if (path)
+ *path = u;
+ else
+ free(u);
+
+ return 0;
+}
+
+int cg_mangle_path(const char *path, char **result) {
+ _cleanup_free_ char *c = NULL, *p = NULL;
+ char *t;
+ int r;
+
+ assert(path);
+ assert(result);
+
+ /* First, check if it already is a filesystem path */
+ if (path_startswith(path, "/sys/fs/cgroup")) {
+
+ t = strdup(path);
+ if (!t)
+ return -ENOMEM;
+
+ *result = path_kill_slashes(t);
+ return 0;
+ }
+
+ /* Otherwise, treat it as cg spec */
+ r = cg_split_spec(path, &c, &p);
+ if (r < 0)
+ return r;
+
+ return cg_get_path(c ?: SYSTEMD_CGROUP_CONTROLLER, p ?: "/", NULL, result);
+}
+
+int cg_get_root_path(char **path) {
+ char *p, *e;
+ int r;
+
+ assert(path);
+
+ r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 1, &p);
+ if (r < 0)
+ return r;
+
+ e = endswith(p, "/" SPECIAL_INIT_SCOPE);
+ if (!e)
+ e = endswith(p, "/" SPECIAL_SYSTEM_SLICE); /* legacy */
+ if (!e)
+ e = endswith(p, "/system"); /* even more legacy */
+ if (e)
+ *e = 0;
+
+ *path = p;
+ return 0;
+}
+
+int cg_shift_path(const char *cgroup, const char *root, const char **shifted) {
+ _cleanup_free_ char *rt = NULL;
+ char *p;
+ int r;
+
+ assert(cgroup);
+ assert(shifted);
+
+ if (!root) {
+ /* If the root was specified let's use that, otherwise
+ * let's determine it from PID 1 */
+
+ r = cg_get_root_path(&rt);
+ if (r < 0)
+ return r;
+
+ root = rt;
+ }
+
+ p = path_startswith(cgroup, root);
+ if (p && p > cgroup)
+ *shifted = p - 1;
+ else
+ *shifted = cgroup;
+
+ return 0;
+}
+
+int cg_pid_get_path_shifted(pid_t pid, const char *root, char **cgroup) {
+ _cleanup_free_ char *raw = NULL;
+ const char *c;
+ int r;
+
+ assert(pid >= 0);
+ assert(cgroup);
+
+ r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &raw);
+ if (r < 0)
+ return r;
+
+ r = cg_shift_path(raw, root, &c);
+ if (r < 0)
+ return r;
+
+ if (c == raw) {
+ *cgroup = raw;
+ raw = NULL;
+ } else {
+ char *n;
+
+ n = strdup(c);
+ if (!n)
+ return -ENOMEM;
+
+ *cgroup = n;
+ }
+
+ return 0;
+}
+
+int cg_path_decode_unit(const char *cgroup, char **unit) {
+ char *c, *s;
+ size_t n;
+
+ assert(cgroup);
+ assert(unit);
+
+ n = strcspn(cgroup, "/");
+ if (n < 3)
+ return -ENXIO;
+
+ c = strndupa(cgroup, n);
+ c = cg_unescape(c);
+
+ if (!unit_name_is_valid(c, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE))
+ return -ENXIO;
+
+ s = strdup(c);
+ if (!s)
+ return -ENOMEM;
+
+ *unit = s;
+ return 0;
+}
+
+static bool valid_slice_name(const char *p, size_t n) {
+
+ if (!p)
+ return false;
+
+ if (n < strlen("x.slice"))
+ return false;
+
+ if (memcmp(p + n - 6, ".slice", 6) == 0) {
+ char buf[n+1], *c;
+
+ memcpy(buf, p, n);
+ buf[n] = 0;
+
+ c = cg_unescape(buf);
+
+ return unit_name_is_valid(c, UNIT_NAME_PLAIN);
+ }
+
+ return false;
+}
+
+static const char *skip_slices(const char *p) {
+ assert(p);
+
+ /* Skips over all slice assignments */
+
+ for (;;) {
+ size_t n;
+
+ p += strspn(p, "/");
+
+ n = strcspn(p, "/");
+ if (!valid_slice_name(p, n))
+ return p;
+
+ p += n;
+ }
+}
+
+int cg_path_get_unit(const char *path, char **ret) {
+ const char *e;
+ char *unit;
+ int r;
+
+ assert(path);
+ assert(ret);
+
+ e = skip_slices(path);
+
+ r = cg_path_decode_unit(e, &unit);
+ if (r < 0)
+ return r;
+
+ /* We skipped over the slices, don't accept any now */
+ if (endswith(unit, ".slice")) {
+ free(unit);
+ return -ENXIO;
+ }
+
+ *ret = unit;
+ return 0;
+}
+
+int cg_pid_get_unit(pid_t pid, char **unit) {
+ _cleanup_free_ char *cgroup = NULL;
+ int r;
+
+ assert(unit);
+
+ r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
+ if (r < 0)
+ return r;
+
+ return cg_path_get_unit(cgroup, unit);
+}
+
+/**
+ * Skip session-*.scope, but require it to be there.
+ */
+static const char *skip_session(const char *p) {
+ size_t n;
+
+ if (isempty(p))
+ return NULL;
+
+ p += strspn(p, "/");
+
+ n = strcspn(p, "/");
+ if (n < strlen("session-x.scope"))
+ return NULL;
+
+ if (memcmp(p, "session-", 8) == 0 && memcmp(p + n - 6, ".scope", 6) == 0) {
+ char buf[n - 8 - 6 + 1];
+
+ memcpy(buf, p + 8, n - 8 - 6);
+ buf[n - 8 - 6] = 0;
+
+ /* Note that session scopes never need unescaping,
+ * since they cannot conflict with the kernel's own
+ * names, hence we don't need to call cg_unescape()
+ * here. */
+
+ if (!session_id_valid(buf))
+ return false;
+
+ p += n;
+ p += strspn(p, "/");
+ return p;
+ }
+
+ return NULL;
+}
+
+/**
+ * Skip user@*.service, but require it to be there.
+ */
+static const char *skip_user_manager(const char *p) {
+ size_t n;
+
+ if (isempty(p))
+ return NULL;
+
+ p += strspn(p, "/");
+
+ n = strcspn(p, "/");
+ if (n < strlen("user@x.service"))
+ return NULL;
+
+ if (memcmp(p, "user@", 5) == 0 && memcmp(p + n - 8, ".service", 8) == 0) {
+ char buf[n - 5 - 8 + 1];
+
+ memcpy(buf, p + 5, n - 5 - 8);
+ buf[n - 5 - 8] = 0;
+
+ /* Note that user manager services never need unescaping,
+ * since they cannot conflict with the kernel's own
+ * names, hence we don't need to call cg_unescape()
+ * here. */
+
+ if (parse_uid(buf, NULL) < 0)
+ return NULL;
+
+ p += n;
+ p += strspn(p, "/");
+
+ return p;
+ }
+
+ return NULL;
+}
+
+static const char *skip_user_prefix(const char *path) {
+ const char *e, *t;
+
+ assert(path);
+
+ /* Skip slices, if there are any */
+ e = skip_slices(path);
+
+ /* Skip the user manager, if it's in the path now... */
+ t = skip_user_manager(e);
+ if (t)
+ return t;
+
+ /* Alternatively skip the user session if it is in the path... */
+ return skip_session(e);
+}
+
+int cg_path_get_user_unit(const char *path, char **ret) {
+ const char *t;
+
+ assert(path);
+ assert(ret);
+
+ t = skip_user_prefix(path);
+ if (!t)
+ return -ENXIO;
+
+ /* And from here on it looks pretty much the same as for a
+ * system unit, hence let's use the same parser from here
+ * on. */
+ return cg_path_get_unit(t, ret);
+}
+
+int cg_pid_get_user_unit(pid_t pid, char **unit) {
+ _cleanup_free_ char *cgroup = NULL;
+ int r;
+
+ assert(unit);
+
+ r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
+ if (r < 0)
+ return r;
+
+ return cg_path_get_user_unit(cgroup, unit);
+}
+
+int cg_path_get_machine_name(const char *path, char **machine) {
+ _cleanup_free_ char *u = NULL;
+ const char *sl;
+ int r;
+
+ r = cg_path_get_unit(path, &u);
+ if (r < 0)
+ return r;
+
+ sl = strjoina("/run/systemd/machines/unit:", u);
+ return readlink_malloc(sl, machine);
+}
+
+int cg_pid_get_machine_name(pid_t pid, char **machine) {
+ _cleanup_free_ char *cgroup = NULL;
+ int r;
+
+ assert(machine);
+
+ r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
+ if (r < 0)
+ return r;
+
+ return cg_path_get_machine_name(cgroup, machine);
+}
+
+int cg_path_get_session(const char *path, char **session) {
+ _cleanup_free_ char *unit = NULL;
+ char *start, *end;
+ int r;
+
+ assert(path);
+
+ r = cg_path_get_unit(path, &unit);
+ if (r < 0)
+ return r;
+
+ start = startswith(unit, "session-");
+ if (!start)
+ return -ENXIO;
+ end = endswith(start, ".scope");
+ if (!end)
+ return -ENXIO;
+
+ *end = 0;
+ if (!session_id_valid(start))
+ return -ENXIO;
+
+ if (session) {
+ char *rr;
+
+ rr = strdup(start);
+ if (!rr)
+ return -ENOMEM;
+
+ *session = rr;
+ }
+
+ return 0;
+}
+
+int cg_pid_get_session(pid_t pid, char **session) {
+ _cleanup_free_ char *cgroup = NULL;
+ int r;
+
+ r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
+ if (r < 0)
+ return r;
+
+ return cg_path_get_session(cgroup, session);
+}
+
+int cg_path_get_owner_uid(const char *path, uid_t *uid) {
+ _cleanup_free_ char *slice = NULL;
+ char *start, *end;
+ int r;
+
+ assert(path);
+
+ r = cg_path_get_slice(path, &slice);
+ if (r < 0)
+ return r;
+
+ start = startswith(slice, "user-");
+ if (!start)
+ return -ENXIO;
+ end = endswith(start, ".slice");
+ if (!end)
+ return -ENXIO;
+
+ *end = 0;
+ if (parse_uid(start, uid) < 0)
+ return -ENXIO;
+
+ return 0;
+}
+
+int cg_pid_get_owner_uid(pid_t pid, uid_t *uid) {
+ _cleanup_free_ char *cgroup = NULL;
+ int r;
+
+ r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
+ if (r < 0)
+ return r;
+
+ return cg_path_get_owner_uid(cgroup, uid);
+}
+
+int cg_path_get_slice(const char *p, char **slice) {
+ const char *e = NULL;
+
+ assert(p);
+ assert(slice);
+
+ /* Finds the right-most slice unit from the beginning, but
+ * stops before we come to the first non-slice unit. */
+
+ for (;;) {
+ size_t n;
+
+ p += strspn(p, "/");
+
+ n = strcspn(p, "/");
+ if (!valid_slice_name(p, n)) {
+
+ if (!e) {
+ char *s;
+
+ s = strdup(SPECIAL_ROOT_SLICE);
+ if (!s)
+ return -ENOMEM;
+
+ *slice = s;
+ return 0;
+ }
+
+ return cg_path_decode_unit(e, slice);
+ }
+
+ e = p;
+ p += n;
+ }
+}
+
+int cg_pid_get_slice(pid_t pid, char **slice) {
+ _cleanup_free_ char *cgroup = NULL;
+ int r;
+
+ assert(slice);
+
+ r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
+ if (r < 0)
+ return r;
+
+ return cg_path_get_slice(cgroup, slice);
+}
+
+int cg_path_get_user_slice(const char *p, char **slice) {
+ const char *t;
+ assert(p);
+ assert(slice);
+
+ t = skip_user_prefix(p);
+ if (!t)
+ return -ENXIO;
+
+ /* And now it looks pretty much the same as for a system
+ * slice, so let's just use the same parser from here on. */
+ return cg_path_get_slice(t, slice);
+}
+
+int cg_pid_get_user_slice(pid_t pid, char **slice) {
+ _cleanup_free_ char *cgroup = NULL;
+ int r;
+
+ assert(slice);
+
+ r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
+ if (r < 0)
+ return r;
+
+ return cg_path_get_user_slice(cgroup, slice);
+}
+
+char *cg_escape(const char *p) {
+ bool need_prefix = false;
+
+ /* This implements very minimal escaping for names to be used
+ * as file names in the cgroup tree: any name which might
+ * conflict with a kernel name or is prefixed with '_' is
+ * prefixed with a '_'. That way, when reading cgroup names it
+ * is sufficient to remove a single prefixing underscore if
+ * there is one. */
+
+ /* The return value of this function (unlike cg_unescape())
+ * needs free()! */
+
+ if (p[0] == 0 ||
+ p[0] == '_' ||
+ p[0] == '.' ||
+ streq(p, "notify_on_release") ||
+ streq(p, "release_agent") ||
+ streq(p, "tasks") ||
+ startswith(p, "cgroup."))
+ need_prefix = true;
+ else {
+ const char *dot;
+
+ dot = strrchr(p, '.');
+ if (dot) {
+ CGroupController c;
+ size_t l = dot - p;
+
+ for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) {
+ const char *n;
+
+ n = cgroup_controller_to_string(c);
+
+ if (l != strlen(n))
+ continue;
+
+ if (memcmp(p, n, l) != 0)
+ continue;
+
+ need_prefix = true;
+ break;
+ }
+ }
+ }
+
+ if (need_prefix)
+ return strappend("_", p);
+
+ return strdup(p);
+}
+
+char *cg_unescape(const char *p) {
+ assert(p);
+
+ /* The return value of this function (unlike cg_escape())
+ * doesn't need free()! */
+
+ if (p[0] == '_')
+ return (char*) p+1;
+
+ return (char*) p;
+}
+
+#define CONTROLLER_VALID \
+ DIGITS LETTERS \
+ "_"
+
+bool cg_controller_is_valid(const char *p) {
+ const char *t, *s;
+
+ if (!p)
+ return false;
+
+ s = startswith(p, "name=");
+ if (s)
+ p = s;
+
+ if (*p == 0 || *p == '_')
+ return false;
+
+ for (t = p; *t; t++)
+ if (!strchr(CONTROLLER_VALID, *t))
+ return false;
+
+ if (t - p > FILENAME_MAX)
+ return false;
+
+ return true;
+}
+
+int cg_slice_to_path(const char *unit, char **ret) {
+ _cleanup_free_ char *p = NULL, *s = NULL, *e = NULL;
+ const char *dash;
+ int r;
+
+ assert(unit);
+ assert(ret);
+
+ if (streq(unit, SPECIAL_ROOT_SLICE)) {
+ char *x;
+
+ x = strdup("");
+ if (!x)
+ return -ENOMEM;
+ *ret = x;
+ return 0;
+ }
+
+ if (!unit_name_is_valid(unit, UNIT_NAME_PLAIN))
+ return -EINVAL;
+
+ if (!endswith(unit, ".slice"))
+ return -EINVAL;
+
+ r = unit_name_to_prefix(unit, &p);
+ if (r < 0)
+ return r;
+
+ dash = strchr(p, '-');
+
+ /* Don't allow initial dashes */
+ if (dash == p)
+ return -EINVAL;
+
+ while (dash) {
+ _cleanup_free_ char *escaped = NULL;
+ char n[dash - p + sizeof(".slice")];
+
+ /* Don't allow trailing or double dashes */
+ if (dash[1] == 0 || dash[1] == '-')
+ return -EINVAL;
+
+ strcpy(stpncpy(n, p, dash - p), ".slice");
+ if (!unit_name_is_valid(n, UNIT_NAME_PLAIN))
+ return -EINVAL;
+
+ escaped = cg_escape(n);
+ if (!escaped)
+ return -ENOMEM;
+
+ if (!strextend(&s, escaped, "/", NULL))
+ return -ENOMEM;
+
+ dash = strchr(dash+1, '-');
+ }
+
+ e = cg_escape(unit);
+ if (!e)
+ return -ENOMEM;
+
+ if (!strextend(&s, e, NULL))
+ return -ENOMEM;
+
+ *ret = s;
+ s = NULL;
+
+ return 0;
+}
+
+int cg_set_attribute(const char *controller, const char *path, const char *attribute, const char *value) {
+ _cleanup_free_ char *p = NULL;
+ int r;
+
+ r = cg_get_path(controller, path, attribute, &p);
+ if (r < 0)
+ return r;
+
+ return write_string_file(p, value, 0);
+}
+
+int cg_get_attribute(const char *controller, const char *path, const char *attribute, char **ret) {
+ _cleanup_free_ char *p = NULL;
+ int r;
+
+ r = cg_get_path(controller, path, attribute, &p);
+ if (r < 0)
+ return r;
+
+ return read_one_line_file(p, ret);
+}
+
+int cg_get_keyed_attribute(const char *controller, const char *path, const char *attribute, const char **keys, char **values) {
+ _cleanup_free_ char *filename = NULL, *content = NULL;
+ char *line, *p;
+ int i, r;
+
+ for (i = 0; keys[i]; i++)
+ values[i] = NULL;
+
+ r = cg_get_path(controller, path, attribute, &filename);
+ if (r < 0)
+ return r;
+
+ r = read_full_file(filename, &content, NULL);
+ if (r < 0)
+ return r;
+
+ p = content;
+ while ((line = strsep(&p, "\n"))) {
+ char *key;
+
+ key = strsep(&line, " ");
+
+ for (i = 0; keys[i]; i++) {
+ if (streq(key, keys[i])) {
+ values[i] = strdup(line);
+ break;
+ }
+ }
+ }
+
+ for (i = 0; keys[i]; i++) {
+ if (!values[i]) {
+ for (i = 0; keys[i]; i++) {
+ free(values[i]);
+ values[i] = NULL;
+ }
+ return -ENOENT;
+ }
+ }
+
+ return 0;
+}
+
+int cg_create_everywhere(CGroupMask supported, CGroupMask mask, const char *path) {
+ CGroupController c;
+ int r, unified;
+
+ /* This one will create a cgroup in our private tree, but also
+ * duplicate it in the trees specified in mask, and remove it
+ * in all others */
+
+ /* First create the cgroup in our own hierarchy. */
+ r = cg_create(SYSTEMD_CGROUP_CONTROLLER, path);
+ if (r < 0)
+ return r;
+
+ /* If we are in the unified hierarchy, we are done now */
+ unified = cg_all_unified();
+ if (unified < 0)
+ return unified;
+ if (unified > 0)
+ return 0;
+
+ /* Otherwise, do the same in the other hierarchies */
+ for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) {
+ CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c);
+ const char *n;
+
+ n = cgroup_controller_to_string(c);
+
+ if (mask & bit)
+ (void) cg_create(n, path);
+ else if (supported & bit)
+ (void) cg_trim(n, path, true);
+ }
+
+ return 0;
+}
+
+int cg_attach_everywhere(CGroupMask supported, const char *path, pid_t pid, cg_migrate_callback_t path_callback, void *userdata) {
+ CGroupController c;
+ int r, unified;
+
+ r = cg_attach(SYSTEMD_CGROUP_CONTROLLER, path, pid);
+ if (r < 0)
+ return r;
+
+ unified = cg_all_unified();
+ if (unified < 0)
+ return unified;
+ if (unified > 0)
+ return 0;
+
+ for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) {
+ CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c);
+ const char *p = NULL;
+
+ if (!(supported & bit))
+ continue;
+
+ if (path_callback)
+ p = path_callback(bit, userdata);
+
+ if (!p)
+ p = path;
+
+ (void) cg_attach_fallback(cgroup_controller_to_string(c), p, pid);
+ }
+
+ return 0;
+}
+
+int cg_attach_many_everywhere(CGroupMask supported, const char *path, Set* pids, cg_migrate_callback_t path_callback, void *userdata) {
+ Iterator i;
+ void *pidp;
+ int r = 0;
+
+ SET_FOREACH(pidp, pids, i) {
+ pid_t pid = PTR_TO_PID(pidp);
+ int q;
+
+ q = cg_attach_everywhere(supported, path, pid, path_callback, userdata);
+ if (q < 0 && r >= 0)
+ r = q;
+ }
+
+ return r;
+}
+
+int cg_migrate_everywhere(CGroupMask supported, const char *from, const char *to, cg_migrate_callback_t to_callback, void *userdata) {
+ CGroupController c;
+ int r = 0, unified;
+
+ if (!path_equal(from, to)) {
+ r = cg_migrate_recursive(SYSTEMD_CGROUP_CONTROLLER, from, SYSTEMD_CGROUP_CONTROLLER, to, CGROUP_REMOVE);
+ if (r < 0)
+ return r;
+ }
+
+ unified = cg_all_unified();
+ if (unified < 0)
+ return unified;
+ if (unified > 0)
+ return r;
+
+ for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) {
+ CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c);
+ const char *p = NULL;
+
+ if (!(supported & bit))
+ continue;
+
+ if (to_callback)
+ p = to_callback(bit, userdata);
+
+ if (!p)
+ p = to;
+
+ (void) cg_migrate_recursive_fallback(SYSTEMD_CGROUP_CONTROLLER, to, cgroup_controller_to_string(c), p, 0);
+ }
+
+ return 0;
+}
+
+int cg_trim_everywhere(CGroupMask supported, const char *path, bool delete_root) {
+ CGroupController c;
+ int r, unified;
+
+ r = cg_trim(SYSTEMD_CGROUP_CONTROLLER, path, delete_root);
+ if (r < 0)
+ return r;
+
+ unified = cg_all_unified();
+ if (unified < 0)
+ return unified;
+ if (unified > 0)
+ return r;
+
+ for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) {
+ CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c);
+
+ if (!(supported & bit))
+ continue;
+
+ (void) cg_trim(cgroup_controller_to_string(c), path, delete_root);
+ }
+
+ return 0;
+}
+
+int cg_mask_supported(CGroupMask *ret) {
+ CGroupMask mask = 0;
+ int r, unified;
+
+ /* Determines the mask of supported cgroup controllers. Only
+ * includes controllers we can make sense of and that are
+ * actually accessible. */
+
+ unified = cg_all_unified();
+ if (unified < 0)
+ return unified;
+ if (unified > 0) {
+ _cleanup_free_ char *root = NULL, *controllers = NULL, *path = NULL;
+ const char *c;
+
+ /* In the unified hierarchy we can read the supported
+ * and accessible controllers from a the top-level
+ * cgroup attribute */
+
+ r = cg_get_root_path(&root);
+ if (r < 0)
+ return r;
+
+ r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, root, "cgroup.controllers", &path);
+ if (r < 0)
+ return r;
+
+ r = read_one_line_file(path, &controllers);
+ if (r < 0)
+ return r;
+
+ c = controllers;
+ for (;;) {
+ _cleanup_free_ char *n = NULL;
+ CGroupController v;
+
+ r = extract_first_word(&c, &n, NULL, 0);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ break;
+
+ v = cgroup_controller_from_string(n);
+ if (v < 0)
+ continue;
+
+ mask |= CGROUP_CONTROLLER_TO_MASK(v);
+ }
+
+ /* Currently, we support the cpu, memory, io and pids
+ * controller in the unified hierarchy, mask
+ * everything else off. */
+ mask &= CGROUP_MASK_CPU | CGROUP_MASK_MEMORY | CGROUP_MASK_IO | CGROUP_MASK_PIDS;
+
+ } else {
+ CGroupController c;
+
+ /* In the legacy hierarchy, we check whether which
+ * hierarchies are mounted. */
+
+ for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) {
+ const char *n;
+
+ n = cgroup_controller_to_string(c);
+ if (controller_is_accessible(n) >= 0)
+ mask |= CGROUP_CONTROLLER_TO_MASK(c);
+ }
+ }
+
+ *ret = mask;
+ return 0;
+}
+
+int cg_kernel_controllers(Set *controllers) {
+ _cleanup_fclose_ FILE *f = NULL;
+ char buf[LINE_MAX];
+ int r;
+
+ assert(controllers);
+
+ /* Determines the full list of kernel-known controllers. Might
+ * include controllers we don't actually support, arbitrary
+ * named hierarchies and controllers that aren't currently
+ * accessible (because not mounted). */
+
+ f = fopen("/proc/cgroups", "re");
+ if (!f) {
+ if (errno == ENOENT)
+ return 0;
+ return -errno;
+ }
+
+ /* Ignore the header line */
+ (void) fgets(buf, sizeof(buf), f);
+
+ for (;;) {
+ char *controller;
+ int enabled = 0;
+
+ errno = 0;
+ if (fscanf(f, "%ms %*i %*i %i", &controller, &enabled) != 2) {
+
+ if (feof(f))
+ break;
+
+ if (ferror(f) && errno > 0)
+ return -errno;
+
+ return -EBADMSG;
+ }
+
+ if (!enabled) {
+ free(controller);
+ continue;
+ }
+
+ if (!cg_controller_is_valid(controller)) {
+ free(controller);
+ return -EBADMSG;
+ }
+
+ r = set_consume(controllers, controller);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+static thread_local CGroupUnified unified_cache = CGROUP_UNIFIED_UNKNOWN;
+
+static int cg_update_unified(void) {
+
+ struct statfs fs;
+
+ /* Checks if we support the unified hierarchy. Returns an
+ * error when the cgroup hierarchies aren't mounted yet or we
+ * have any other trouble determining if the unified hierarchy
+ * is supported. */
+
+ if (unified_cache >= CGROUP_UNIFIED_NONE)
+ return 0;
+
+ if (statfs("/sys/fs/cgroup/", &fs) < 0)
+ return -errno;
+
+ if (F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC))
+ unified_cache = CGROUP_UNIFIED_ALL;
+ else if (F_TYPE_EQUAL(fs.f_type, TMPFS_MAGIC)) {
+ if (statfs("/sys/fs/cgroup/systemd/", &fs) < 0)
+ return -errno;
+
+ unified_cache = F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC) ?
+ CGROUP_UNIFIED_SYSTEMD : CGROUP_UNIFIED_NONE;
+ } else
+ return -ENOMEDIUM;
+
+ return 0;
+}
+
+int cg_unified(const char *controller) {
+
+ int r;
+
+ r = cg_update_unified();
+ if (r < 0)
+ return r;
+
+ if (streq_ptr(controller, SYSTEMD_CGROUP_CONTROLLER))
+ return unified_cache >= CGROUP_UNIFIED_SYSTEMD;
+ else
+ return unified_cache >= CGROUP_UNIFIED_ALL;
+}
+
+int cg_all_unified(void) {
+
+ return cg_unified(NULL);
+}
+
+void cg_unified_flush(void) {
+ unified_cache = CGROUP_UNIFIED_UNKNOWN;
+}
+
+int cg_enable_everywhere(CGroupMask supported, CGroupMask mask, const char *p) {
+ _cleanup_free_ char *fs = NULL;
+ CGroupController c;
+ int r, unified;
+
+ assert(p);
+
+ if (supported == 0)
+ return 0;
+
+ unified = cg_all_unified();
+ if (unified < 0)
+ return unified;
+ if (!unified) /* on the legacy hiearchy there's no joining of controllers defined */
+ return 0;
+
+ r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, p, "cgroup.subtree_control", &fs);
+ if (r < 0)
+ return r;
+
+ for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) {
+ CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c);
+ const char *n;
+
+ if (!(supported & bit))
+ continue;
+
+ n = cgroup_controller_to_string(c);
+ {
+ char s[1 + strlen(n) + 1];
+
+ s[0] = mask & bit ? '+' : '-';
+ strcpy(s + 1, n);
+
+ r = write_string_file(fs, s, 0);
+ if (r < 0)
+ log_debug_errno(r, "Failed to enable controller %s for %s (%s): %m", n, p, fs);
+ }
+ }
+
+ return 0;
+}
+
+bool cg_is_unified_wanted(void) {
+ static thread_local int wanted = -1;
+ int r, unified;
+
+ /* If the hierarchy is already mounted, then follow whatever
+ * was chosen for it. */
+ unified = cg_all_unified();
+ if (unified >= 0)
+ return unified;
+
+ /* Otherwise, let's see what the kernel command line has to
+ * say. Since checking that is expensive, let's cache the
+ * result. */
+ if (wanted >= 0)
+ return wanted;
+
+ r = get_proc_cmdline_key("systemd.unified_cgroup_hierarchy", NULL);
+ if (r > 0)
+ return (wanted = true);
+ else {
+ _cleanup_free_ char *value = NULL;
+
+ r = get_proc_cmdline_key("systemd.unified_cgroup_hierarchy=", &value);
+ if (r < 0)
+ return false;
+ if (r == 0)
+ return (wanted = false);
+
+ return (wanted = parse_boolean(value) > 0);
+ }
+}
+
+bool cg_is_legacy_wanted(void) {
+ return !cg_is_unified_wanted();
+}
+
+bool cg_is_unified_systemd_controller_wanted(void) {
+ static thread_local int wanted = -1;
+ int r, unified;
+
+ /* If the unified hierarchy is requested in full, no need to
+ * bother with this. */
+ if (cg_is_unified_wanted())
+ return 0;
+
+ /* If the hierarchy is already mounted, then follow whatever
+ * was chosen for it. */
+ unified = cg_unified(SYSTEMD_CGROUP_CONTROLLER);
+ if (unified >= 0)
+ return unified;
+
+ /* Otherwise, let's see what the kernel command line has to
+ * say. Since checking that is expensive, let's cache the
+ * result. */
+ if (wanted >= 0)
+ return wanted;
+
+ r = get_proc_cmdline_key("systemd.legacy_systemd_cgroup_controller", NULL);
+ if (r > 0)
+ wanted = false;
+ else {
+ _cleanup_free_ char *value = NULL;
+
+ r = get_proc_cmdline_key("systemd.legacy_systemd_cgroup_controller=", &value);
+ if (r < 0)
+ return false;
+
+ if (r == 0)
+ wanted = false;
+ else
+ wanted = parse_boolean(value) <= 0;
+ }
+
+ return wanted;
+}
+
+bool cg_is_legacy_systemd_controller_wanted(void) {
+ return cg_is_legacy_wanted() && !cg_is_unified_systemd_controller_wanted();
+}
+
+int cg_weight_parse(const char *s, uint64_t *ret) {
+ uint64_t u;
+ int r;
+
+ if (isempty(s)) {
+ *ret = CGROUP_WEIGHT_INVALID;
+ return 0;
+ }
+
+ r = safe_atou64(s, &u);
+ if (r < 0)
+ return r;
+
+ if (u < CGROUP_WEIGHT_MIN || u > CGROUP_WEIGHT_MAX)
+ return -ERANGE;
+
+ *ret = u;
+ return 0;
+}
+
+const uint64_t cgroup_io_limit_defaults[_CGROUP_IO_LIMIT_TYPE_MAX] = {
+ [CGROUP_IO_RBPS_MAX] = CGROUP_LIMIT_MAX,
+ [CGROUP_IO_WBPS_MAX] = CGROUP_LIMIT_MAX,
+ [CGROUP_IO_RIOPS_MAX] = CGROUP_LIMIT_MAX,
+ [CGROUP_IO_WIOPS_MAX] = CGROUP_LIMIT_MAX,
+};
+
+static const char* const cgroup_io_limit_type_table[_CGROUP_IO_LIMIT_TYPE_MAX] = {
+ [CGROUP_IO_RBPS_MAX] = "IOReadBandwidthMax",
+ [CGROUP_IO_WBPS_MAX] = "IOWriteBandwidthMax",
+ [CGROUP_IO_RIOPS_MAX] = "IOReadIOPSMax",
+ [CGROUP_IO_WIOPS_MAX] = "IOWriteIOPSMax",
+};
+
+DEFINE_STRING_TABLE_LOOKUP(cgroup_io_limit_type, CGroupIOLimitType);
+
+int cg_cpu_shares_parse(const char *s, uint64_t *ret) {
+ uint64_t u;
+ int r;
+
+ if (isempty(s)) {
+ *ret = CGROUP_CPU_SHARES_INVALID;
+ return 0;
+ }
+
+ r = safe_atou64(s, &u);
+ if (r < 0)
+ return r;
+
+ if (u < CGROUP_CPU_SHARES_MIN || u > CGROUP_CPU_SHARES_MAX)
+ return -ERANGE;
+
+ *ret = u;
+ return 0;
+}
+
+int cg_blkio_weight_parse(const char *s, uint64_t *ret) {
+ uint64_t u;
+ int r;
+
+ if (isempty(s)) {
+ *ret = CGROUP_BLKIO_WEIGHT_INVALID;
+ return 0;
+ }
+
+ r = safe_atou64(s, &u);
+ if (r < 0)
+ return r;
+
+ if (u < CGROUP_BLKIO_WEIGHT_MIN || u > CGROUP_BLKIO_WEIGHT_MAX)
+ return -ERANGE;
+
+ *ret = u;
+ return 0;
+}
+
+bool is_cgroup_fs(const struct statfs *s) {
+ return is_fs_type(s, CGROUP_SUPER_MAGIC) ||
+ is_fs_type(s, CGROUP2_SUPER_MAGIC);
+}
+
+bool fd_is_cgroup_fs(int fd) {
+ struct statfs s;
+
+ if (fstatfs(fd, &s) < 0)
+ return -errno;
+
+ return is_cgroup_fs(&s);
+}
+
+static const char *cgroup_controller_table[_CGROUP_CONTROLLER_MAX] = {
+ [CGROUP_CONTROLLER_CPU] = "cpu",
+ [CGROUP_CONTROLLER_CPUACCT] = "cpuacct",
+ [CGROUP_CONTROLLER_IO] = "io",
+ [CGROUP_CONTROLLER_BLKIO] = "blkio",
+ [CGROUP_CONTROLLER_MEMORY] = "memory",
+ [CGROUP_CONTROLLER_DEVICES] = "devices",
+ [CGROUP_CONTROLLER_PIDS] = "pids",
+};
+
+DEFINE_STRING_TABLE_LOOKUP(cgroup_controller, CGroupController);
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-01 12:01:08 +0000