2190 lines
61 KiB
C
2190 lines
61 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <errno.h>
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#include <ftw.h>
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#include <limits.h>
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#include <signal.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/utsname.h>
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#include <sys/xattr.h>
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#include <unistd.h>
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#include "alloc-util.h"
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#include "cgroup-util.h"
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#include "def.h"
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#include "dirent-util.h"
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#include "extract-word.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "format-util.h"
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#include "fs-util.h"
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#include "log.h"
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#include "login-util.h"
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#include "macro.h"
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#include "missing_magic.h"
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#include "mkdir.h"
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#include "parse-util.h"
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#include "path-util.h"
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#include "process-util.h"
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#include "set.h"
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#include "special.h"
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#include "stat-util.h"
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#include "stdio-util.h"
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#include "string-table.h"
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#include "string-util.h"
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#include "strv.h"
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#include "unit-name.h"
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#include "user-util.h"
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#include "xattr-util.h"
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static int cg_enumerate_items(const char *controller, const char *path, FILE **_f, const char *item) {
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_cleanup_free_ char *fs = NULL;
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FILE *f;
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int r;
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assert(_f);
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r = cg_get_path(controller, path, item, &fs);
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if (r < 0)
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return r;
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f = fopen(fs, "re");
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if (!f)
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return -errno;
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*_f = f;
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return 0;
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}
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int cg_enumerate_processes(const char *controller, const char *path, FILE **_f) {
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return cg_enumerate_items(controller, path, _f, "cgroup.procs");
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}
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int cg_read_pid(FILE *f, pid_t *_pid) {
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unsigned long ul;
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/* Note that the cgroup.procs might contain duplicates! See
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* cgroups.txt for details. */
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assert(f);
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assert(_pid);
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errno = 0;
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if (fscanf(f, "%lu", &ul) != 1) {
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if (feof(f))
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return 0;
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return errno_or_else(EIO);
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}
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if (ul <= 0)
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return -EIO;
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*_pid = (pid_t) ul;
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return 1;
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}
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int cg_read_event(
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const char *controller,
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const char *path,
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const char *event,
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char **ret) {
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_cleanup_free_ char *events = NULL, *content = NULL;
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int r;
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r = cg_get_path(controller, path, "cgroup.events", &events);
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if (r < 0)
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return r;
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r = read_full_file(events, &content, NULL);
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if (r < 0)
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return r;
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for (const char *p = content;;) {
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_cleanup_free_ char *line = NULL, *key = NULL, *val = NULL;
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const char *q;
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r = extract_first_word(&p, &line, "\n", 0);
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if (r < 0)
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return r;
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if (r == 0)
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return -ENOENT;
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q = line;
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r = extract_first_word(&q, &key, " ", 0);
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if (r < 0)
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return r;
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if (r == 0)
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return -EINVAL;
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if (!streq(key, event))
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continue;
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val = strdup(q);
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if (!val)
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return -ENOMEM;
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*ret = TAKE_PTR(val);
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return 0;
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}
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}
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bool cg_ns_supported(void) {
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static thread_local int enabled = -1;
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if (enabled >= 0)
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return enabled;
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if (access("/proc/self/ns/cgroup", F_OK) < 0) {
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if (errno != ENOENT)
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log_debug_errno(errno, "Failed to check whether /proc/self/ns/cgroup is available, assuming not: %m");
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enabled = false;
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} else
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enabled = true;
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return enabled;
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}
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bool cg_freezer_supported(void) {
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static thread_local int supported = -1;
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if (supported >= 0)
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return supported;
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supported = cg_all_unified() > 0 && access("/sys/fs/cgroup/init.scope/cgroup.freeze", F_OK) == 0;
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return supported;
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}
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int cg_enumerate_subgroups(const char *controller, const char *path, DIR **_d) {
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_cleanup_free_ char *fs = NULL;
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int r;
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DIR *d;
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assert(_d);
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/* This is not recursive! */
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r = cg_get_path(controller, path, NULL, &fs);
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if (r < 0)
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return r;
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d = opendir(fs);
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if (!d)
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return -errno;
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*_d = d;
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return 0;
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}
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int cg_read_subgroup(DIR *d, char **fn) {
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struct dirent *de;
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assert(d);
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assert(fn);
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FOREACH_DIRENT_ALL(de, d, return -errno) {
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char *b;
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if (de->d_type != DT_DIR)
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continue;
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if (dot_or_dot_dot(de->d_name))
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continue;
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b = strdup(de->d_name);
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if (!b)
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return -ENOMEM;
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*fn = b;
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return 1;
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}
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return 0;
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}
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int cg_rmdir(const char *controller, const char *path) {
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_cleanup_free_ char *p = NULL;
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int r;
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r = cg_get_path(controller, path, NULL, &p);
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if (r < 0)
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return r;
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r = rmdir(p);
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if (r < 0 && errno != ENOENT)
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return -errno;
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r = cg_hybrid_unified();
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if (r <= 0)
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return r;
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if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) {
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r = cg_rmdir(SYSTEMD_CGROUP_CONTROLLER_LEGACY, path);
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if (r < 0)
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log_warning_errno(r, "Failed to remove compat systemd cgroup %s: %m", path);
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}
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return 0;
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}
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static int cg_kill_items(
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const char *controller,
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const char *path,
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int sig,
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CGroupFlags flags,
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Set *s,
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cg_kill_log_func_t log_kill,
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void *userdata,
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const char *item) {
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_cleanup_set_free_ Set *allocated_set = NULL;
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bool done = false;
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int r, ret = 0, ret_log_kill = 0;
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pid_t my_pid;
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assert(sig >= 0);
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/* Don't send SIGCONT twice. Also, SIGKILL always works even when process is suspended, hence don't send
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* SIGCONT on SIGKILL. */
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if (IN_SET(sig, SIGCONT, SIGKILL))
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flags &= ~CGROUP_SIGCONT;
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/* This goes through the tasks list and kills them all. This
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* is repeated until no further processes are added to the
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* tasks list, to properly handle forking processes */
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if (!s) {
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s = allocated_set = set_new(NULL);
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if (!s)
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return -ENOMEM;
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}
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my_pid = getpid_cached();
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do {
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_cleanup_fclose_ FILE *f = NULL;
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pid_t pid = 0;
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done = true;
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r = cg_enumerate_items(controller, path, &f, item);
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if (r < 0) {
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if (ret >= 0 && r != -ENOENT)
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return r;
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return ret;
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}
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while ((r = cg_read_pid(f, &pid)) > 0) {
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if ((flags & CGROUP_IGNORE_SELF) && pid == my_pid)
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continue;
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if (set_get(s, PID_TO_PTR(pid)) == PID_TO_PTR(pid))
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continue;
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if (log_kill)
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ret_log_kill = log_kill(pid, sig, userdata);
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/* If we haven't killed this process yet, kill
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* it */
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if (kill(pid, sig) < 0) {
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if (ret >= 0 && errno != ESRCH)
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ret = -errno;
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} else {
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if (flags & CGROUP_SIGCONT)
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(void) kill(pid, SIGCONT);
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if (ret == 0) {
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if (log_kill)
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ret = ret_log_kill;
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else
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ret = 1;
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}
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}
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done = false;
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r = set_put(s, PID_TO_PTR(pid));
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if (r < 0) {
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if (ret >= 0)
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return r;
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return ret;
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}
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}
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if (r < 0) {
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if (ret >= 0)
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return r;
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return ret;
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}
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/* To avoid racing against processes which fork
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* quicker than we can kill them we repeat this until
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* no new pids need to be killed. */
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} while (!done);
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return ret;
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}
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int cg_kill(
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const char *controller,
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const char *path,
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int sig,
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CGroupFlags flags,
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Set *s,
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cg_kill_log_func_t log_kill,
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void *userdata) {
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int r;
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r = cg_kill_items(controller, path, sig, flags, s, log_kill, userdata, "cgroup.procs");
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if (r < 0 || sig != SIGKILL)
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return r;
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/* Only in case of killing with SIGKILL and when using cgroupsv2, kill remaining threads manually as
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a workaround for kernel bug. It was fixed in 5.2-rc5 (c03cd7738a83), backported to 4.19.66
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(4340d175b898) and 4.14.138 (feb6b123b7dd). */
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r = cg_unified_controller(controller);
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if (r <= 0)
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return r;
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return cg_kill_items(controller, path, sig, flags, s, log_kill, userdata, "cgroup.threads");
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}
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int cg_kill_recursive(
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const char *controller,
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const char *path,
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int sig,
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CGroupFlags flags,
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Set *s,
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cg_kill_log_func_t log_kill,
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void *userdata) {
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_cleanup_set_free_ Set *allocated_set = NULL;
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_cleanup_closedir_ DIR *d = NULL;
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int r, ret;
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char *fn;
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assert(path);
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assert(sig >= 0);
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if (!s) {
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s = allocated_set = set_new(NULL);
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if (!s)
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return -ENOMEM;
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}
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ret = cg_kill(controller, path, sig, flags, s, log_kill, userdata);
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r = cg_enumerate_subgroups(controller, path, &d);
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if (r < 0) {
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if (ret >= 0 && r != -ENOENT)
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return r;
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return ret;
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}
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while ((r = cg_read_subgroup(d, &fn)) > 0) {
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_cleanup_free_ char *p = NULL;
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p = path_join(empty_to_root(path), fn);
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free(fn);
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if (!p)
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return -ENOMEM;
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r = cg_kill_recursive(controller, p, sig, flags, s, log_kill, userdata);
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if (r != 0 && ret >= 0)
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ret = r;
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}
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if (ret >= 0 && r < 0)
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ret = r;
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if (flags & CGROUP_REMOVE) {
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r = cg_rmdir(controller, path);
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if (r < 0 && ret >= 0 && !IN_SET(r, -ENOENT, -EBUSY))
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return r;
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}
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return ret;
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}
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static const char *controller_to_dirname(const char *controller) {
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const char *e;
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assert(controller);
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/* Converts a controller name to the directory name below
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* /sys/fs/cgroup/ we want to mount it to. Effectively, this
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* just cuts off the name= prefixed used for named
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* hierarchies, if it is specified. */
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if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) {
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if (cg_hybrid_unified() > 0)
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controller = SYSTEMD_CGROUP_CONTROLLER_HYBRID;
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else
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controller = SYSTEMD_CGROUP_CONTROLLER_LEGACY;
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}
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e = startswith(controller, "name=");
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if (e)
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return e;
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return controller;
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}
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static int join_path_legacy(const char *controller, const char *path, const char *suffix, char **fs) {
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const char *dn;
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char *t = NULL;
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assert(fs);
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assert(controller);
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dn = controller_to_dirname(controller);
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if (isempty(path) && isempty(suffix))
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t = path_join("/sys/fs/cgroup", dn);
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else if (isempty(path))
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t = path_join("/sys/fs/cgroup", dn, suffix);
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else if (isempty(suffix))
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t = path_join("/sys/fs/cgroup", dn, path);
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else
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t = path_join("/sys/fs/cgroup", dn, path, suffix);
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if (!t)
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return -ENOMEM;
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*fs = t;
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return 0;
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}
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static int join_path_unified(const char *path, const char *suffix, char **fs) {
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char *t;
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assert(fs);
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if (isempty(path) && isempty(suffix))
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t = strdup("/sys/fs/cgroup");
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else if (isempty(path))
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t = path_join("/sys/fs/cgroup", suffix);
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else if (isempty(suffix))
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t = path_join("/sys/fs/cgroup", path);
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else
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t = path_join("/sys/fs/cgroup", path, suffix);
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if (!t)
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return -ENOMEM;
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*fs = t;
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return 0;
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}
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int cg_get_path(const char *controller, const char *path, const char *suffix, char **fs) {
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int r;
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assert(fs);
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if (!controller) {
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char *t;
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/* If no controller is specified, we return the path
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* *below* the controllers, without any prefix. */
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if (!path && !suffix)
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return -EINVAL;
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if (!suffix)
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t = strdup(path);
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else if (!path)
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t = strdup(suffix);
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else
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t = path_join(path, suffix);
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if (!t)
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return -ENOMEM;
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*fs = path_simplify(t, false);
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return 0;
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}
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if (!cg_controller_is_valid(controller))
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return -EINVAL;
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r = cg_all_unified();
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if (r < 0)
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return r;
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if (r > 0)
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r = join_path_unified(path, suffix, fs);
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else
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r = join_path_legacy(controller, path, suffix, fs);
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if (r < 0)
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return r;
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path_simplify(*fs, false);
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return 0;
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}
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static int controller_is_accessible(const char *controller) {
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int r;
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assert(controller);
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/* Checks whether a specific controller is accessible,
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* i.e. its hierarchy mounted. In the unified hierarchy all
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* controllers are considered accessible, except for the named
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* hierarchies */
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if (!cg_controller_is_valid(controller))
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return -EINVAL;
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r = cg_all_unified();
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if (r < 0)
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return r;
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if (r > 0) {
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/* We don't support named hierarchies if we are using
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* the unified hierarchy. */
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if (streq(controller, SYSTEMD_CGROUP_CONTROLLER))
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return 0;
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if (startswith(controller, "name="))
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return -EOPNOTSUPP;
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} else {
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const char *cc, *dn;
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dn = controller_to_dirname(controller);
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cc = strjoina("/sys/fs/cgroup/", dn);
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if (laccess(cc, F_OK) < 0)
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return -errno;
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}
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return 0;
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}
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int cg_get_path_and_check(const char *controller, const char *path, const char *suffix, char **fs) {
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int r;
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assert(controller);
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assert(fs);
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/* Check if the specified controller is actually accessible */
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r = controller_is_accessible(controller);
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if (r < 0)
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return r;
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return cg_get_path(controller, path, suffix, fs);
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}
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int cg_set_xattr(const char *controller, const char *path, const char *name, const void *value, size_t size, int flags) {
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_cleanup_free_ char *fs = NULL;
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int r;
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|
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assert(path);
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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_get_xattr_malloc(const char *controller, const char *path, const char *name, char **ret) {
|
|
_cleanup_free_ char *fs = NULL;
|
|
int r;
|
|
|
|
assert(path);
|
|
assert(name);
|
|
|
|
r = cg_get_path(controller, path, NULL, &fs);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = getxattr_malloc(fs, name, ret, false);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return r;
|
|
}
|
|
|
|
int cg_remove_xattr(const char *controller, const char *path, const char *name) {
|
|
_cleanup_free_ char *fs = NULL;
|
|
int r;
|
|
|
|
assert(path);
|
|
assert(name);
|
|
|
|
r = cg_get_path(controller, path, NULL, &fs);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (removexattr(fs, name) < 0)
|
|
return -errno;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cg_pid_get_path(const char *controller, pid_t pid, char **ret_path) {
|
|
_cleanup_fclose_ FILE *f = NULL;
|
|
const char *fs, *controller_str;
|
|
int unified, r;
|
|
|
|
assert(pid >= 0);
|
|
assert(ret_path);
|
|
|
|
if (controller) {
|
|
if (!cg_controller_is_valid(controller))
|
|
return -EINVAL;
|
|
} else
|
|
controller = SYSTEMD_CGROUP_CONTROLLER;
|
|
|
|
unified = cg_unified_controller(controller);
|
|
if (unified < 0)
|
|
return unified;
|
|
if (unified == 0) {
|
|
if (streq(controller, SYSTEMD_CGROUP_CONTROLLER))
|
|
controller_str = SYSTEMD_CGROUP_CONTROLLER_LEGACY;
|
|
else
|
|
controller_str = controller;
|
|
}
|
|
|
|
fs = procfs_file_alloca(pid, "cgroup");
|
|
r = fopen_unlocked(fs, "re", &f);
|
|
if (r == -ENOENT)
|
|
return -ESRCH;
|
|
if (r < 0)
|
|
return r;
|
|
|
|
for (;;) {
|
|
_cleanup_free_ char *line = NULL;
|
|
char *e;
|
|
|
|
r = read_line(f, LONG_LINE_MAX, &line);
|
|
if (r < 0)
|
|
return r;
|
|
if (r == 0)
|
|
return -ENODATA;
|
|
|
|
if (unified) {
|
|
e = startswith(line, "0:");
|
|
if (!e)
|
|
continue;
|
|
|
|
e = strchr(e, ':');
|
|
if (!e)
|
|
continue;
|
|
} else {
|
|
char *l;
|
|
|
|
l = strchr(line, ':');
|
|
if (!l)
|
|
continue;
|
|
|
|
l++;
|
|
e = strchr(l, ':');
|
|
if (!e)
|
|
continue;
|
|
*e = 0;
|
|
|
|
r = string_contains_word(l, ",", controller_str);
|
|
if (r < 0)
|
|
return r;
|
|
if (r == 0)
|
|
continue;
|
|
}
|
|
|
|
char *path = strdup(e + 1);
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
/* Truncate suffix indicating the process is a zombie */
|
|
e = endswith(path, " (deleted)");
|
|
if (e)
|
|
*e = 0;
|
|
|
|
*ret_path = path;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
int cg_install_release_agent(const char *controller, const char *agent) {
|
|
_cleanup_free_ char *fs = NULL, *contents = NULL;
|
|
const char *sc;
|
|
int r;
|
|
|
|
assert(agent);
|
|
|
|
r = cg_unified_controller(controller);
|
|
if (r < 0)
|
|
return r;
|
|
if (r > 0) /* 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, WRITE_STRING_FILE_DISABLE_BUFFER);
|
|
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", WRITE_STRING_FILE_DISABLE_BUFFER);
|
|
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;
|
|
|
|
r = cg_unified_controller(controller);
|
|
if (r < 0)
|
|
return r;
|
|
if (r > 0) /* 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", WRITE_STRING_FILE_DISABLE_BUFFER);
|
|
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, "", WRITE_STRING_FILE_DISABLE_BUFFER);
|
|
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 true;
|
|
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 r;
|
|
|
|
assert(path);
|
|
|
|
/* The root cgroup is always populated */
|
|
if (controller && empty_or_root(path))
|
|
return false;
|
|
|
|
r = cg_unified_controller(controller);
|
|
if (r < 0)
|
|
return r;
|
|
if (r > 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 == -ENOENT)
|
|
return true;
|
|
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 true;
|
|
if (r < 0)
|
|
return r;
|
|
|
|
while ((r = cg_read_subgroup(d, &fn)) > 0) {
|
|
_cleanup_free_ char *p = NULL;
|
|
|
|
p = path_join(path, fn);
|
|
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 **ret_controller, char **ret_path) {
|
|
_cleanup_free_ char *controller = NULL, *path = NULL;
|
|
|
|
assert(spec);
|
|
|
|
if (*spec == '/') {
|
|
if (!path_is_normalized(spec))
|
|
return -EINVAL;
|
|
|
|
if (ret_path) {
|
|
path = strdup(spec);
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
path_simplify(path, false);
|
|
}
|
|
|
|
} else {
|
|
const char *e;
|
|
|
|
e = strchr(spec, ':');
|
|
if (e) {
|
|
controller = strndup(spec, e-spec);
|
|
if (!controller)
|
|
return -ENOMEM;
|
|
if (!cg_controller_is_valid(controller))
|
|
return -EINVAL;
|
|
|
|
if (!isempty(e + 1)) {
|
|
path = strdup(e+1);
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
if (!path_is_normalized(path) ||
|
|
!path_is_absolute(path))
|
|
return -EINVAL;
|
|
|
|
path_simplify(path, false);
|
|
}
|
|
|
|
} else {
|
|
if (!cg_controller_is_valid(spec))
|
|
return -EINVAL;
|
|
|
|
if (ret_controller) {
|
|
controller = strdup(spec);
|
|
if (!controller)
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (ret_controller)
|
|
*ret_controller = TAKE_PTR(controller);
|
|
if (ret_path)
|
|
*ret_path = TAKE_PTR(path);
|
|
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_simplify(t, false);
|
|
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 = TAKE_PTR(raw);
|
|
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. */
|
|
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 (IN_SET(p[0], 0, '_', '.') ||
|
|
STR_IN_SET(p, "notify_on_release", "release_agent", "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 strjoin("_", 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;
|
|
|
|
if (streq(p, SYSTEMD_CGROUP_CONTROLLER))
|
|
return true;
|
|
|
|
s = startswith(p, "name=");
|
|
if (s)
|
|
p = s;
|
|
|
|
if (IN_SET(*p, 0, '_'))
|
|
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")];
|
|
|
|
#if HAS_FEATURE_MEMORY_SANITIZER
|
|
/* msan doesn't instrument stpncpy, so it thinks
|
|
* n is later used uninitialized:
|
|
* https://github.com/google/sanitizers/issues/926
|
|
*/
|
|
zero(n);
|
|
#endif
|
|
|
|
/* Don't allow trailing or double dashes */
|
|
if (IN_SET(dash[1], 0, '-'))
|
|
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, "/"))
|
|
return -ENOMEM;
|
|
|
|
dash = strchr(dash+1, '-');
|
|
}
|
|
|
|
e = cg_escape(unit);
|
|
if (!e)
|
|
return -ENOMEM;
|
|
|
|
if (!strextend(&s, e))
|
|
return -ENOMEM;
|
|
|
|
*ret = TAKE_PTR(s);
|
|
|
|
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, WRITE_STRING_FILE_DISABLE_BUFFER);
|
|
}
|
|
|
|
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_attribute_as_uint64(const char *controller, const char *path, const char *attribute, uint64_t *ret) {
|
|
_cleanup_free_ char *value = NULL;
|
|
uint64_t v;
|
|
int r;
|
|
|
|
assert(ret);
|
|
|
|
r = cg_get_attribute(controller, path, attribute, &value);
|
|
if (r == -ENOENT)
|
|
return -ENODATA;
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (streq(value, "max")) {
|
|
*ret = CGROUP_LIMIT_MAX;
|
|
return 0;
|
|
}
|
|
|
|
r = safe_atou64(value, &v);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
*ret = v;
|
|
return 0;
|
|
}
|
|
|
|
int cg_get_attribute_as_bool(const char *controller, const char *path, const char *attribute, bool *ret) {
|
|
_cleanup_free_ char *value = NULL;
|
|
int r;
|
|
|
|
assert(ret);
|
|
|
|
r = cg_get_attribute(controller, path, attribute, &value);
|
|
if (r == -ENOENT)
|
|
return -ENODATA;
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = parse_boolean(value);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
*ret = r;
|
|
return 0;
|
|
}
|
|
|
|
int cg_get_keyed_attribute_full(
|
|
const char *controller,
|
|
const char *path,
|
|
const char *attribute,
|
|
char **keys,
|
|
char **ret_values,
|
|
CGroupKeyMode mode) {
|
|
|
|
_cleanup_free_ char *filename = NULL, *contents = NULL;
|
|
const char *p;
|
|
size_t n, i, n_done = 0;
|
|
char **v;
|
|
int r;
|
|
|
|
/* Reads one or more fields of a cgroup v2 keyed attribute file. The 'keys' parameter should be an strv with
|
|
* all keys to retrieve. The 'ret_values' parameter should be passed as string size with the same number of
|
|
* entries as 'keys'. On success each entry will be set to the value of the matching key.
|
|
*
|
|
* If the attribute file doesn't exist at all returns ENOENT, if any key is not found returns ENXIO. If mode
|
|
* is set to GG_KEY_MODE_GRACEFUL we ignore missing keys and return those that were parsed successfully. */
|
|
|
|
r = cg_get_path(controller, path, attribute, &filename);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = read_full_file(filename, &contents, NULL);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
n = strv_length(keys);
|
|
if (n == 0) /* No keys to retrieve? That's easy, we are done then */
|
|
return 0;
|
|
|
|
/* Let's build this up in a temporary array for now in order not to clobber the return parameter on failure */
|
|
v = newa0(char*, n);
|
|
|
|
for (p = contents; *p;) {
|
|
const char *w = NULL;
|
|
|
|
for (i = 0; i < n; i++)
|
|
if (!v[i]) {
|
|
w = first_word(p, keys[i]);
|
|
if (w)
|
|
break;
|
|
}
|
|
|
|
if (w) {
|
|
size_t l;
|
|
|
|
l = strcspn(w, NEWLINE);
|
|
v[i] = strndup(w, l);
|
|
if (!v[i]) {
|
|
r = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
n_done++;
|
|
if (n_done >= n)
|
|
goto done;
|
|
|
|
p = w + l;
|
|
} else
|
|
p += strcspn(p, NEWLINE);
|
|
|
|
p += strspn(p, NEWLINE);
|
|
}
|
|
|
|
if (mode & CG_KEY_MODE_GRACEFUL)
|
|
goto done;
|
|
|
|
r = -ENXIO;
|
|
|
|
fail:
|
|
for (i = 0; i < n; i++)
|
|
free(v[i]);
|
|
|
|
return r;
|
|
|
|
done:
|
|
memcpy(ret_values, v, sizeof(char*) * n);
|
|
if (mode & CG_KEY_MODE_GRACEFUL)
|
|
return n_done;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cg_mask_to_string(CGroupMask mask, char **ret) {
|
|
_cleanup_free_ char *s = NULL;
|
|
size_t n = 0, allocated = 0;
|
|
bool space = false;
|
|
CGroupController c;
|
|
|
|
assert(ret);
|
|
|
|
if (mask == 0) {
|
|
*ret = NULL;
|
|
return 0;
|
|
}
|
|
|
|
for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) {
|
|
const char *k;
|
|
size_t l;
|
|
|
|
if (!FLAGS_SET(mask, CGROUP_CONTROLLER_TO_MASK(c)))
|
|
continue;
|
|
|
|
k = cgroup_controller_to_string(c);
|
|
l = strlen(k);
|
|
|
|
if (!GREEDY_REALLOC(s, allocated, n + space + l + 1))
|
|
return -ENOMEM;
|
|
|
|
if (space)
|
|
s[n] = ' ';
|
|
memcpy(s + n + space, k, l);
|
|
n += space + l;
|
|
|
|
space = true;
|
|
}
|
|
|
|
assert(s);
|
|
|
|
s[n] = 0;
|
|
*ret = TAKE_PTR(s);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cg_mask_from_string(const char *value, CGroupMask *ret) {
|
|
CGroupMask m = 0;
|
|
|
|
assert(ret);
|
|
assert(value);
|
|
|
|
for (;;) {
|
|
_cleanup_free_ char *n = NULL;
|
|
CGroupController v;
|
|
int r;
|
|
|
|
r = extract_first_word(&value, &n, NULL, 0);
|
|
if (r < 0)
|
|
return r;
|
|
if (r == 0)
|
|
break;
|
|
|
|
v = cgroup_controller_from_string(n);
|
|
if (v < 0)
|
|
continue;
|
|
|
|
m |= CGROUP_CONTROLLER_TO_MASK(v);
|
|
}
|
|
|
|
*ret = m;
|
|
return 0;
|
|
}
|
|
|
|
int cg_mask_supported(CGroupMask *ret) {
|
|
CGroupMask mask;
|
|
int r;
|
|
|
|
/* Determines the mask of supported cgroup controllers. Only includes controllers we can make sense of and that
|
|
* are actually accessible. Only covers real controllers, i.e. not the CGROUP_CONTROLLER_BPF_xyz
|
|
* pseudo-controllers. */
|
|
|
|
r = cg_all_unified();
|
|
if (r < 0)
|
|
return r;
|
|
if (r > 0) {
|
|
_cleanup_free_ char *root = NULL, *controllers = NULL, *path = NULL;
|
|
|
|
/* In the unified hierarchy we can read the supported and accessible controllers from
|
|
* 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;
|
|
|
|
r = cg_mask_from_string(controllers, &mask);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
/* Mask controllers that are not supported in unified hierarchy. */
|
|
mask &= CGROUP_MASK_V2;
|
|
|
|
} else {
|
|
CGroupController c;
|
|
|
|
/* In the legacy hierarchy, we check which hierarchies are mounted. */
|
|
|
|
mask = 0;
|
|
for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) {
|
|
CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c);
|
|
const char *n;
|
|
|
|
if (!FLAGS_SET(CGROUP_MASK_V1, bit))
|
|
continue;
|
|
|
|
n = cgroup_controller_to_string(c);
|
|
if (controller_is_accessible(n) >= 0)
|
|
mask |= bit;
|
|
}
|
|
}
|
|
|
|
*ret = mask;
|
|
return 0;
|
|
}
|
|
|
|
int cg_kernel_controllers(Set **ret) {
|
|
_cleanup_set_free_free_ Set *controllers = NULL;
|
|
_cleanup_fclose_ FILE *f = NULL;
|
|
int r;
|
|
|
|
assert(ret);
|
|
|
|
/* Determines the full list of kernel-known controllers. Might include controllers we don't actually support
|
|
* and controllers that aren't currently accessible (because not mounted). This does not include "name="
|
|
* pseudo-controllers. */
|
|
|
|
controllers = set_new(&string_hash_ops);
|
|
if (!controllers)
|
|
return -ENOMEM;
|
|
|
|
r = fopen_unlocked("/proc/cgroups", "re", &f);
|
|
if (r == -ENOENT) {
|
|
*ret = NULL;
|
|
return 0;
|
|
}
|
|
if (r < 0)
|
|
return r;
|
|
|
|
/* Ignore the header line */
|
|
(void) read_line(f, (size_t) -1, NULL);
|
|
|
|
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))
|
|
return errno_or_else(EIO);
|
|
|
|
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;
|
|
}
|
|
|
|
*ret = TAKE_PTR(controllers);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* The hybrid mode was initially implemented in v232 and simply mounted cgroup2 on
|
|
* /sys/fs/cgroup/systemd. This unfortunately broke other tools (such as docker) which expected the v1
|
|
* "name=systemd" hierarchy on /sys/fs/cgroup/systemd. From v233 and on, the hybrid mode mounts v2 on
|
|
* /sys/fs/cgroup/unified and maintains "name=systemd" hierarchy on /sys/fs/cgroup/systemd for compatibility
|
|
* with other tools.
|
|
*
|
|
* To keep live upgrade working, we detect and support v232 layout. When v232 layout is detected, to keep
|
|
* cgroup v2 process management but disable the compat dual layout, we return true on
|
|
* cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER) and false on cg_hybrid_unified().
|
|
*/
|
|
static thread_local bool unified_systemd_v232;
|
|
|
|
int cg_unified_cached(bool flush) {
|
|
static thread_local CGroupUnified unified_cache = CGROUP_UNIFIED_UNKNOWN;
|
|
|
|
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 (flush)
|
|
unified_cache = CGROUP_UNIFIED_UNKNOWN;
|
|
else if (unified_cache >= CGROUP_UNIFIED_NONE)
|
|
return unified_cache;
|
|
|
|
if (statfs("/sys/fs/cgroup/", &fs) < 0)
|
|
return log_debug_errno(errno, "statfs(\"/sys/fs/cgroup/\") failed: %m");
|
|
|
|
if (F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC)) {
|
|
log_debug("Found cgroup2 on /sys/fs/cgroup/, full unified hierarchy");
|
|
unified_cache = CGROUP_UNIFIED_ALL;
|
|
} else if (F_TYPE_EQUAL(fs.f_type, TMPFS_MAGIC)) {
|
|
if (statfs("/sys/fs/cgroup/unified/", &fs) == 0 &&
|
|
F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC)) {
|
|
log_debug("Found cgroup2 on /sys/fs/cgroup/unified, unified hierarchy for systemd controller");
|
|
unified_cache = CGROUP_UNIFIED_SYSTEMD;
|
|
unified_systemd_v232 = false;
|
|
} else {
|
|
if (statfs("/sys/fs/cgroup/systemd/", &fs) < 0)
|
|
return log_debug_errno(errno, "statfs(\"/sys/fs/cgroup/systemd\" failed: %m");
|
|
|
|
if (F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC)) {
|
|
log_debug("Found cgroup2 on /sys/fs/cgroup/systemd, unified hierarchy for systemd controller (v232 variant)");
|
|
unified_cache = CGROUP_UNIFIED_SYSTEMD;
|
|
unified_systemd_v232 = true;
|
|
} else if (F_TYPE_EQUAL(fs.f_type, CGROUP_SUPER_MAGIC)) {
|
|
log_debug("Found cgroup on /sys/fs/cgroup/systemd, legacy hierarchy");
|
|
unified_cache = CGROUP_UNIFIED_NONE;
|
|
} else {
|
|
log_debug("Unexpected filesystem type %llx mounted on /sys/fs/cgroup/systemd, assuming legacy hierarchy",
|
|
(unsigned long long) fs.f_type);
|
|
unified_cache = CGROUP_UNIFIED_NONE;
|
|
}
|
|
}
|
|
} else if (F_TYPE_EQUAL(fs.f_type, SYSFS_MAGIC)) {
|
|
return log_debug_errno(SYNTHETIC_ERRNO(ENOMEDIUM),
|
|
"No filesystem is currently mounted on /sys/fs/cgroup.");
|
|
} else
|
|
return log_debug_errno(SYNTHETIC_ERRNO(ENOMEDIUM),
|
|
"Unknown filesystem type %llx mounted on /sys/fs/cgroup.",
|
|
(unsigned long long)fs.f_type);
|
|
|
|
return unified_cache;
|
|
}
|
|
|
|
int cg_unified_controller(const char *controller) {
|
|
int r;
|
|
|
|
r = cg_unified_cached(false);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (r == CGROUP_UNIFIED_NONE)
|
|
return false;
|
|
|
|
if (r >= CGROUP_UNIFIED_ALL)
|
|
return true;
|
|
|
|
return streq_ptr(controller, SYSTEMD_CGROUP_CONTROLLER);
|
|
}
|
|
|
|
int cg_all_unified(void) {
|
|
int r;
|
|
|
|
r = cg_unified_cached(false);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return r >= CGROUP_UNIFIED_ALL;
|
|
}
|
|
|
|
int cg_hybrid_unified(void) {
|
|
int r;
|
|
|
|
r = cg_unified_cached(false);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return r == CGROUP_UNIFIED_SYSTEMD && !unified_systemd_v232;
|
|
}
|
|
|
|
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);
|
|
|
|
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 *const cgroup_controller_table[_CGROUP_CONTROLLER_MAX] = {
|
|
[CGROUP_CONTROLLER_CPU] = "cpu",
|
|
[CGROUP_CONTROLLER_CPUACCT] = "cpuacct",
|
|
[CGROUP_CONTROLLER_CPUSET] = "cpuset",
|
|
[CGROUP_CONTROLLER_IO] = "io",
|
|
[CGROUP_CONTROLLER_BLKIO] = "blkio",
|
|
[CGROUP_CONTROLLER_MEMORY] = "memory",
|
|
[CGROUP_CONTROLLER_DEVICES] = "devices",
|
|
[CGROUP_CONTROLLER_PIDS] = "pids",
|
|
[CGROUP_CONTROLLER_BPF_FIREWALL] = "bpf-firewall",
|
|
[CGROUP_CONTROLLER_BPF_DEVICES] = "bpf-devices",
|
|
};
|
|
|
|
DEFINE_STRING_TABLE_LOOKUP(cgroup_controller, CGroupController);
|
|
|
|
CGroupMask get_cpu_accounting_mask(void) {
|
|
static CGroupMask needed_mask = (CGroupMask) -1;
|
|
|
|
/* On kernel ≥4.15 with unified hierarchy, cpu.stat's usage_usec is
|
|
* provided externally from the CPU controller, which means we don't
|
|
* need to enable the CPU controller just to get metrics. This is good,
|
|
* because enabling the CPU controller comes at a minor performance
|
|
* hit, especially when it's propagated deep into large hierarchies.
|
|
* There's also no separate CPU accounting controller available within
|
|
* a unified hierarchy.
|
|
*
|
|
* This combination of factors results in the desired cgroup mask to
|
|
* enable for CPU accounting varying as follows:
|
|
*
|
|
* ╔═════════════════════╤═════════════════════╗
|
|
* ║ Linux ≥4.15 │ Linux <4.15 ║
|
|
* ╔═══════════════╬═════════════════════╪═════════════════════╣
|
|
* ║ Unified ║ nothing │ CGROUP_MASK_CPU ║
|
|
* ╟───────────────╫─────────────────────┼─────────────────────╢
|
|
* ║ Hybrid/Legacy ║ CGROUP_MASK_CPUACCT │ CGROUP_MASK_CPUACCT ║
|
|
* ╚═══════════════╩═════════════════════╧═════════════════════╝
|
|
*
|
|
* We check kernel version here instead of manually checking whether
|
|
* cpu.stat is present for every cgroup, as that check in itself would
|
|
* already be fairly expensive.
|
|
*
|
|
* Kernels where this patch has been backported will therefore have the
|
|
* CPU controller enabled unnecessarily. This is more expensive than
|
|
* necessary, but harmless. ☺️
|
|
*/
|
|
|
|
if (needed_mask == (CGroupMask) -1) {
|
|
if (cg_all_unified()) {
|
|
struct utsname u;
|
|
assert_se(uname(&u) >= 0);
|
|
|
|
if (str_verscmp(u.release, "4.15") < 0)
|
|
needed_mask = CGROUP_MASK_CPU;
|
|
else
|
|
needed_mask = 0;
|
|
} else
|
|
needed_mask = CGROUP_MASK_CPUACCT;
|
|
}
|
|
|
|
return needed_mask;
|
|
}
|
|
|
|
bool cpu_accounting_is_cheap(void) {
|
|
return get_cpu_accounting_mask() == 0;
|
|
}
|
|
|
|
static const char* const managed_oom_mode_table[_MANAGED_OOM_MODE_MAX] = {
|
|
[MANAGED_OOM_AUTO] = "auto",
|
|
[MANAGED_OOM_KILL] = "kill",
|
|
};
|
|
|
|
DEFINE_STRING_TABLE_LOOKUP(managed_oom_mode, ManagedOOMMode);
|