1257 lines
31 KiB
C
1257 lines
31 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <unistd.h>
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#include <signal.h>
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#include <string.h>
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#include <stdlib.h>
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#include <dirent.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <ftw.h>
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#include "cgroup-util.h"
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#include "log.h"
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#include "set.h"
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#include "macro.h"
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#include "util.h"
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#include "path-util.h"
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#include "strv.h"
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int cg_enumerate_processes(const char *controller, const char *path, FILE **_f) {
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char *fs;
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int r;
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FILE *f;
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assert(path);
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assert(_f);
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r = cg_get_path(controller, path, "cgroup.procs", &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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free(fs);
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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_tasks(const char *controller, const char *path, FILE **_f) {
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char *fs;
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int r;
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FILE *f;
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assert(path);
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assert(_f);
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r = cg_get_path(controller, path, "tasks", &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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free(fs);
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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_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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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 ? -errno : -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_enumerate_subgroups(const char *controller, const char *path, DIR **_d) {
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char *fs;
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int r;
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DIR *d;
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assert(path);
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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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free(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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errno = 0;
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while ((de = readdir(d))) {
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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 (streq(de->d_name, ".") ||
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streq(de->d_name, ".."))
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continue;
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if (!(b = strdup(de->d_name)))
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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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if (errno)
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return -errno;
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return 0;
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}
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int cg_rmdir(const char *controller, const char *path, bool honour_sticky) {
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char *p;
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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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if (honour_sticky) {
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char *tasks;
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/* If the sticky bit is set don't remove the directory */
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tasks = strappend(p, "/tasks");
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if (!tasks) {
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free(p);
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return -ENOMEM;
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}
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r = file_is_priv_sticky(tasks);
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free(tasks);
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if (r > 0) {
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free(p);
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return 0;
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}
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}
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r = rmdir(p);
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free(p);
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return (r < 0 && errno != ENOENT) ? -errno : 0;
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}
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int cg_kill(const char *controller, const char *path, int sig, bool sigcont, bool ignore_self, Set *s) {
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bool done = false;
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int r, ret = 0;
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pid_t my_pid;
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FILE *f = NULL;
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Set *allocated_set = NULL;
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assert(controller);
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assert(path);
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assert(sig >= 0);
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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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if (!(s = allocated_set = set_new(trivial_hash_func, trivial_compare_func)))
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return -ENOMEM;
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my_pid = getpid();
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do {
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pid_t pid = 0;
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done = true;
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if ((r = cg_enumerate_processes(controller, path, &f)) < 0) {
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if (ret >= 0 && r != -ENOENT)
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ret = r;
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goto finish;
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}
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while ((r = cg_read_pid(f, &pid)) > 0) {
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if (pid == my_pid && ignore_self)
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continue;
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if (set_get(s, LONG_TO_PTR(pid)) == LONG_TO_PTR(pid))
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continue;
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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 if (ret == 0) {
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if (sigcont)
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kill(pid, SIGCONT);
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ret = 1;
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}
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done = false;
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if ((r = set_put(s, LONG_TO_PTR(pid))) < 0) {
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if (ret >= 0)
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ret = r;
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goto finish;
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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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ret = r;
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goto finish;
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}
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fclose(f);
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f = NULL;
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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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finish:
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if (allocated_set)
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set_free(allocated_set);
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if (f)
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fclose(f);
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return ret;
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}
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int cg_kill_recursive(const char *controller, const char *path, int sig, bool sigcont, bool ignore_self, bool rem, Set *s) {
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int r, ret = 0;
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DIR *d = NULL;
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char *fn;
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Set *allocated_set = NULL;
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assert(path);
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assert(controller);
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assert(sig >= 0);
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if (!s)
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if (!(s = allocated_set = set_new(trivial_hash_func, trivial_compare_func)))
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return -ENOMEM;
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ret = cg_kill(controller, path, sig, sigcont, ignore_self, s);
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if ((r = cg_enumerate_subgroups(controller, path, &d)) < 0) {
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if (ret >= 0 && r != -ENOENT)
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ret = r;
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goto finish;
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}
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while ((r = cg_read_subgroup(d, &fn)) > 0) {
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char *p = NULL;
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r = asprintf(&p, "%s/%s", path, fn);
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free(fn);
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if (r < 0) {
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if (ret >= 0)
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ret = -ENOMEM;
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goto finish;
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}
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r = cg_kill_recursive(controller, p, sig, sigcont, ignore_self, rem, s);
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free(p);
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if (r != 0 && ret >= 0)
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ret = r;
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}
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if (r < 0 && ret >= 0)
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ret = r;
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if (rem)
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if ((r = cg_rmdir(controller, path, true)) < 0) {
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if (ret >= 0 &&
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r != -ENOENT &&
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r != -EBUSY)
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ret = r;
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}
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finish:
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if (d)
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closedir(d);
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if (allocated_set)
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set_free(allocated_set);
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return ret;
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}
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int cg_kill_recursive_and_wait(const char *controller, const char *path, bool rem) {
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unsigned i;
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assert(path);
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assert(controller);
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/* This safely kills all processes; first it sends a SIGTERM,
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* then checks 8 times after 200ms whether the group is now
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* empty, then kills everything that is left with SIGKILL and
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* finally checks 5 times after 200ms each whether the group
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* is finally empty. */
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for (i = 0; i < 15; i++) {
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int sig, r;
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if (i <= 0)
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sig = SIGTERM;
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else if (i == 9)
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sig = SIGKILL;
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else
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sig = 0;
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if ((r = cg_kill_recursive(controller, path, sig, true, true, rem, NULL)) <= 0)
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return r;
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usleep(200 * USEC_PER_MSEC);
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}
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return 0;
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}
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int cg_migrate(const char *controller, const char *from, const char *to, bool ignore_self) {
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bool done = false;
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Set *s;
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int r, ret = 0;
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pid_t my_pid;
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FILE *f = NULL;
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assert(controller);
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assert(from);
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assert(to);
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if (!(s = set_new(trivial_hash_func, trivial_compare_func)))
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return -ENOMEM;
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my_pid = getpid();
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do {
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pid_t pid = 0;
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done = true;
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if ((r = cg_enumerate_tasks(controller, from, &f)) < 0) {
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if (ret >= 0 && r != -ENOENT)
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ret = r;
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goto finish;
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}
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while ((r = cg_read_pid(f, &pid)) > 0) {
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/* This might do weird stuff if we aren't a
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* single-threaded program. However, we
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* luckily know we are not */
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if (pid == my_pid && ignore_self)
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continue;
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if (set_get(s, LONG_TO_PTR(pid)) == LONG_TO_PTR(pid))
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continue;
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if ((r = cg_attach(controller, to, pid)) < 0) {
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if (ret >= 0 && r != -ESRCH)
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ret = r;
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} else if (ret == 0)
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ret = 1;
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done = false;
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if ((r = set_put(s, LONG_TO_PTR(pid))) < 0) {
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if (ret >= 0)
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ret = r;
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goto finish;
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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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ret = r;
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goto finish;
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}
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fclose(f);
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f = NULL;
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} while (!done);
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finish:
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set_free(s);
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if (f)
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fclose(f);
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return ret;
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}
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int cg_migrate_recursive(const char *controller, const char *from, const char *to, bool ignore_self, bool rem) {
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int r, ret = 0;
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DIR *d = NULL;
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char *fn;
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assert(controller);
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assert(from);
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assert(to);
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ret = cg_migrate(controller, from, to, ignore_self);
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if ((r = cg_enumerate_subgroups(controller, from, &d)) < 0) {
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if (ret >= 0 && r != -ENOENT)
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ret = r;
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goto finish;
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}
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while ((r = cg_read_subgroup(d, &fn)) > 0) {
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char *p = NULL;
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r = asprintf(&p, "%s/%s", from, fn);
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free(fn);
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if (r < 0) {
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if (ret >= 0)
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ret = -ENOMEM;
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goto finish;
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}
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r = cg_migrate_recursive(controller, p, to, ignore_self, rem);
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free(p);
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if (r != 0 && ret >= 0)
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ret = r;
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}
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|
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if (r < 0 && ret >= 0)
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ret = r;
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|
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if (rem)
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if ((r = cg_rmdir(controller, from, true)) < 0) {
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if (ret >= 0 &&
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r != -ENOENT &&
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r != -EBUSY)
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ret = r;
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}
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finish:
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if (d)
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closedir(d);
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return ret;
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}
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static const char *normalize_controller(const char *controller) {
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|
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if (streq(controller, SYSTEMD_CGROUP_CONTROLLER))
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return "systemd";
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else if (startswith(controller, "name="))
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return controller + 5;
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else
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return controller;
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}
|
|
|
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static int join_path(const char *controller, const char *path, const char *suffix, char **fs) {
|
|
char *t = NULL;
|
|
|
|
if (!(controller || path))
|
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return -EINVAL;
|
|
|
|
if (controller) {
|
|
if (path && suffix)
|
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t = strjoin("/sys/fs/cgroup/", controller, "/", path, "/", suffix, NULL);
|
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else if (path)
|
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t = strjoin("/sys/fs/cgroup/", controller, "/", path, NULL);
|
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else if (suffix)
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t = strjoin("/sys/fs/cgroup/", controller, "/", suffix, NULL);
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else
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t = strjoin("/sys/fs/cgroup/", controller, NULL);
|
|
} else {
|
|
if (path && suffix)
|
|
t = strjoin(path, "/", suffix, NULL);
|
|
else if (path)
|
|
t = strdup(path);
|
|
}
|
|
|
|
if (!t)
|
|
return -ENOMEM;
|
|
|
|
path_kill_slashes(t);
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|
|
|
*fs = t;
|
|
return 0;
|
|
}
|
|
|
|
int cg_get_path(const char *controller, const char *path, const char *suffix, char **fs) {
|
|
const char *p;
|
|
static __thread bool good = false;
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|
|
|
assert(fs);
|
|
|
|
if (_unlikely_(!good)) {
|
|
int r;
|
|
|
|
r = path_is_mount_point("/sys/fs/cgroup", false);
|
|
if (r <= 0)
|
|
return r < 0 ? r : -ENOENT;
|
|
|
|
/* Cache this to save a few stat()s */
|
|
good = true;
|
|
}
|
|
|
|
p = controller ? normalize_controller(controller) : NULL;
|
|
return join_path(p, path, suffix, fs);
|
|
}
|
|
|
|
static int check(const char *p) {
|
|
char *cc;
|
|
|
|
assert(p);
|
|
|
|
/* Check if this controller actually really exists */
|
|
cc = alloca(sizeof("/sys/fs/cgroup/") + strlen(p));
|
|
strcpy(stpcpy(cc, "/sys/fs/cgroup/"), p);
|
|
if (access(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) {
|
|
const char *p;
|
|
int r;
|
|
|
|
assert(controller);
|
|
assert(fs);
|
|
|
|
if (isempty(controller))
|
|
return -EINVAL;
|
|
|
|
/* Normalize the controller syntax */
|
|
p = normalize_controller(controller);
|
|
|
|
/* Check if this controller actually really exists */
|
|
r = check(p);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return join_path(p, path, suffix, fs);
|
|
}
|
|
|
|
static int trim_cb(const char *path, const struct stat *sb, int typeflag, struct FTW *ftwbuf) {
|
|
char *p;
|
|
bool is_sticky;
|
|
|
|
if (typeflag != FTW_DP)
|
|
return 0;
|
|
|
|
if (ftwbuf->level < 1)
|
|
return 0;
|
|
|
|
p = strappend(path, "/tasks");
|
|
if (!p) {
|
|
errno = ENOMEM;
|
|
return 1;
|
|
}
|
|
|
|
is_sticky = file_is_priv_sticky(p) > 0;
|
|
free(p);
|
|
|
|
if (is_sticky)
|
|
return 0;
|
|
|
|
rmdir(path);
|
|
return 0;
|
|
}
|
|
|
|
int cg_trim(const char *controller, const char *path, bool delete_root) {
|
|
char *fs;
|
|
int r = 0;
|
|
|
|
assert(controller);
|
|
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)
|
|
r = errno ? -errno : -EIO;
|
|
|
|
if (delete_root) {
|
|
bool is_sticky;
|
|
char *p;
|
|
|
|
p = strappend(fs, "/tasks");
|
|
if (!p) {
|
|
free(fs);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
is_sticky = file_is_priv_sticky(p) > 0;
|
|
free(p);
|
|
|
|
if (!is_sticky)
|
|
if (rmdir(fs) < 0 && errno != ENOENT) {
|
|
if (r == 0)
|
|
r = -errno;
|
|
}
|
|
}
|
|
|
|
free(fs);
|
|
|
|
return r;
|
|
}
|
|
|
|
int cg_delete(const char *controller, const char *path) {
|
|
char *parent;
|
|
int r;
|
|
|
|
assert(controller);
|
|
assert(path);
|
|
|
|
if ((r = path_get_parent(path, &parent)) < 0)
|
|
return r;
|
|
|
|
r = cg_migrate_recursive(controller, path, parent, false, true);
|
|
free(parent);
|
|
|
|
return r == -ENOENT ? 0 : r;
|
|
}
|
|
|
|
int cg_attach(const char *controller, const char *path, pid_t pid) {
|
|
char *fs;
|
|
int r;
|
|
char c[32];
|
|
|
|
assert(controller);
|
|
assert(path);
|
|
assert(pid >= 0);
|
|
|
|
r = cg_get_path_and_check(controller, path, "tasks", &fs);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (pid == 0)
|
|
pid = getpid();
|
|
|
|
snprintf(c, sizeof(c), "%lu\n", (unsigned long) pid);
|
|
char_array_0(c);
|
|
|
|
r = write_one_line_file(fs, c);
|
|
free(fs);
|
|
|
|
return r;
|
|
}
|
|
|
|
int cg_set_group_access(const char *controller, const char *path, mode_t mode, uid_t uid, gid_t gid) {
|
|
char *fs;
|
|
int r;
|
|
|
|
assert(controller);
|
|
assert(path);
|
|
|
|
if (mode != (mode_t) -1)
|
|
mode &= 0777;
|
|
|
|
r = cg_get_path(controller, path, NULL, &fs);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = chmod_and_chown(fs, mode, uid, gid);
|
|
free(fs);
|
|
|
|
return r;
|
|
}
|
|
|
|
int cg_set_task_access(const char *controller, const char *path, mode_t mode, uid_t uid, gid_t gid, int sticky) {
|
|
char *fs;
|
|
int r;
|
|
|
|
assert(controller);
|
|
assert(path);
|
|
|
|
if (mode == (mode_t) -1 && uid == (uid_t) -1 && gid == (gid_t) -1 && sticky < 0)
|
|
return 0;
|
|
|
|
if (mode != (mode_t) -1)
|
|
mode &= 0666;
|
|
|
|
r = cg_get_path(controller, path, "tasks", &fs);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (sticky >= 0 && mode != (mode_t) -1)
|
|
/* Both mode and sticky param are passed */
|
|
mode |= (sticky ? S_ISVTX : 0);
|
|
else if ((sticky >= 0 && mode == (mode_t) -1) ||
|
|
(mode != (mode_t) -1 && sticky < 0)) {
|
|
struct stat st;
|
|
|
|
/* Only one param is passed, hence read the current
|
|
* mode from the file itself */
|
|
|
|
r = lstat(fs, &st);
|
|
if (r < 0) {
|
|
free(fs);
|
|
return -errno;
|
|
}
|
|
|
|
if (mode == (mode_t) -1)
|
|
/* No mode set, we just shall set the sticky bit */
|
|
mode = (st.st_mode & ~S_ISVTX) | (sticky ? S_ISVTX : 0);
|
|
else
|
|
/* Only mode set, leave sticky bit untouched */
|
|
mode = (st.st_mode & ~0777) | mode;
|
|
}
|
|
|
|
r = chmod_and_chown(fs, mode, uid, gid);
|
|
free(fs);
|
|
|
|
return r;
|
|
}
|
|
|
|
int cg_get_by_pid(const char *controller, pid_t pid, char **path) {
|
|
int r;
|
|
char *p = NULL;
|
|
FILE *f;
|
|
char *fs;
|
|
size_t cs;
|
|
|
|
assert(controller);
|
|
assert(path);
|
|
assert(pid >= 0);
|
|
|
|
if (pid == 0)
|
|
pid = getpid();
|
|
|
|
if (asprintf(&fs, "/proc/%lu/cgroup", (unsigned long) pid) < 0)
|
|
return -ENOMEM;
|
|
|
|
f = fopen(fs, "re");
|
|
free(fs);
|
|
|
|
if (!f)
|
|
return errno == ENOENT ? -ESRCH : -errno;
|
|
|
|
cs = strlen(controller);
|
|
|
|
while (!feof(f)) {
|
|
char line[LINE_MAX];
|
|
char *l;
|
|
|
|
errno = 0;
|
|
if (!(fgets(line, sizeof(line), f))) {
|
|
if (feof(f))
|
|
break;
|
|
|
|
r = errno ? -errno : -EIO;
|
|
goto finish;
|
|
}
|
|
|
|
truncate_nl(line);
|
|
|
|
if (!(l = strchr(line, ':')))
|
|
continue;
|
|
|
|
l++;
|
|
if (strncmp(l, controller, cs) != 0)
|
|
continue;
|
|
|
|
if (l[cs] != ':')
|
|
continue;
|
|
|
|
if (!(p = strdup(l + cs + 1))) {
|
|
r = -ENOMEM;
|
|
goto finish;
|
|
}
|
|
|
|
*path = p;
|
|
r = 0;
|
|
goto finish;
|
|
}
|
|
|
|
r = -ENOENT;
|
|
|
|
finish:
|
|
fclose(f);
|
|
|
|
return r;
|
|
}
|
|
|
|
int cg_install_release_agent(const char *controller, const char *agent) {
|
|
char *fs = NULL, *contents = NULL, *line = NULL, *sc;
|
|
int r;
|
|
|
|
assert(controller);
|
|
assert(agent);
|
|
|
|
if ((r = cg_get_path(controller, NULL, "release_agent", &fs)) < 0)
|
|
return r;
|
|
|
|
if ((r = read_one_line_file(fs, &contents)) < 0)
|
|
goto finish;
|
|
|
|
sc = strstrip(contents);
|
|
if (sc[0] == 0) {
|
|
|
|
if (asprintf(&line, "%s\n", agent) < 0) {
|
|
r = -ENOMEM;
|
|
goto finish;
|
|
}
|
|
|
|
if ((r = write_one_line_file(fs, line)) < 0)
|
|
goto finish;
|
|
|
|
} else if (!streq(sc, agent)) {
|
|
r = -EEXIST;
|
|
goto finish;
|
|
}
|
|
|
|
free(fs);
|
|
fs = NULL;
|
|
if ((r = cg_get_path(controller, NULL, "notify_on_release", &fs)) < 0)
|
|
goto finish;
|
|
|
|
free(contents);
|
|
contents = NULL;
|
|
if ((r = read_one_line_file(fs, &contents)) < 0)
|
|
goto finish;
|
|
|
|
sc = strstrip(contents);
|
|
|
|
if (streq(sc, "0")) {
|
|
if ((r = write_one_line_file(fs, "1\n")) < 0)
|
|
goto finish;
|
|
|
|
r = 1;
|
|
} else if (!streq(sc, "1")) {
|
|
r = -EIO;
|
|
goto finish;
|
|
} else
|
|
r = 0;
|
|
|
|
finish:
|
|
free(fs);
|
|
free(contents);
|
|
free(line);
|
|
|
|
return r;
|
|
}
|
|
|
|
int cg_is_empty(const char *controller, const char *path, bool ignore_self) {
|
|
pid_t pid = 0, self_pid;
|
|
int r;
|
|
FILE *f = NULL;
|
|
bool found = false;
|
|
|
|
assert(path);
|
|
|
|
r = cg_enumerate_tasks(controller, path, &f);
|
|
if (r < 0)
|
|
return r == -ENOENT ? 1 : r;
|
|
|
|
self_pid = getpid();
|
|
|
|
while ((r = cg_read_pid(f, &pid)) > 0) {
|
|
|
|
if (ignore_self && pid == self_pid)
|
|
continue;
|
|
|
|
found = true;
|
|
break;
|
|
}
|
|
|
|
fclose(f);
|
|
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return !found;
|
|
}
|
|
|
|
int cg_is_empty_recursive(const char *controller, const char *path, bool ignore_self) {
|
|
int r;
|
|
DIR *d = NULL;
|
|
char *fn;
|
|
|
|
assert(path);
|
|
|
|
r = cg_is_empty(controller, path, ignore_self);
|
|
if (r <= 0)
|
|
return r;
|
|
|
|
r = cg_enumerate_subgroups(controller, path, &d);
|
|
if (r < 0)
|
|
return r == -ENOENT ? 1 : r;
|
|
|
|
while ((r = cg_read_subgroup(d, &fn)) > 0) {
|
|
char *p = NULL;
|
|
|
|
r = asprintf(&p, "%s/%s", path, fn);
|
|
free(fn);
|
|
|
|
if (r < 0) {
|
|
r = -ENOMEM;
|
|
goto finish;
|
|
}
|
|
|
|
r = cg_is_empty_recursive(controller, p, ignore_self);
|
|
free(p);
|
|
|
|
if (r <= 0)
|
|
goto finish;
|
|
}
|
|
|
|
if (r >= 0)
|
|
r = 1;
|
|
|
|
finish:
|
|
|
|
if (d)
|
|
closedir(d);
|
|
|
|
return r;
|
|
}
|
|
|
|
int cg_split_spec(const char *spec, char **controller, char **path) {
|
|
const char *e;
|
|
char *t = NULL, *u = NULL;
|
|
|
|
assert(spec);
|
|
assert(controller || path);
|
|
|
|
if (*spec == '/') {
|
|
|
|
if (path) {
|
|
if (!(t = strdup(spec)))
|
|
return -ENOMEM;
|
|
|
|
*path = t;
|
|
}
|
|
|
|
if (controller)
|
|
*controller = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
if (!(e = strchr(spec, ':'))) {
|
|
|
|
if (strchr(spec, '/') || spec[0] == 0)
|
|
return -EINVAL;
|
|
|
|
if (controller) {
|
|
if (!(t = strdup(spec)))
|
|
return -ENOMEM;
|
|
|
|
*controller = t;
|
|
}
|
|
|
|
if (path)
|
|
*path = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
if (e[1] != '/' ||
|
|
e == spec ||
|
|
memchr(spec, '/', e-spec))
|
|
return -EINVAL;
|
|
|
|
if (controller)
|
|
if (!(t = strndup(spec, e-spec)))
|
|
return -ENOMEM;
|
|
|
|
if (path)
|
|
if (!(u = strdup(e+1))) {
|
|
free(t);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (controller)
|
|
*controller = t;
|
|
|
|
if (path)
|
|
*path = u;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cg_join_spec(const char *controller, const char *path, char **spec) {
|
|
assert(controller);
|
|
assert(path);
|
|
|
|
if (!path_is_absolute(path) ||
|
|
controller[0] == 0 ||
|
|
strchr(controller, ':') ||
|
|
strchr(controller, '/'))
|
|
return -EINVAL;
|
|
|
|
if (asprintf(spec, "%s:%s", controller, path) < 0)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cg_fix_path(const char *path, char **result) {
|
|
char *t, *c, *p;
|
|
int r;
|
|
|
|
assert(path);
|
|
assert(result);
|
|
|
|
/* First check if it already is a filesystem path */
|
|
if (path_startswith(path, "/sys/fs/cgroup") &&
|
|
access(path, F_OK) >= 0) {
|
|
|
|
t = strdup(path);
|
|
if (!t)
|
|
return -ENOMEM;
|
|
|
|
*result = t;
|
|
return 0;
|
|
}
|
|
|
|
/* Otherwise treat it as cg spec */
|
|
r = cg_split_spec(path, &c, &p);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = cg_get_path(c ? c : SYSTEMD_CGROUP_CONTROLLER, p ? p : "/", NULL, result);
|
|
free(c);
|
|
free(p);
|
|
|
|
return r;
|
|
}
|
|
|
|
int cg_get_user_path(char **path) {
|
|
char *root, *p;
|
|
|
|
assert(path);
|
|
|
|
/* Figure out the place to put user cgroups below. We use the
|
|
* same as PID 1 has but with the "/system" suffix replaced by
|
|
* "/user" */
|
|
|
|
if (cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 1, &root) < 0)
|
|
p = strdup("/user");
|
|
else {
|
|
if (endswith(root, "/system"))
|
|
root[strlen(root) - 7] = 0;
|
|
else if (streq(root, "/"))
|
|
root[0] = 0;
|
|
|
|
p = strappend(root, "/user");
|
|
free(root);
|
|
}
|
|
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
*path = p;
|
|
return 0;
|
|
}
|
|
|
|
char **cg_shorten_controllers(char **controllers) {
|
|
char **f, **t;
|
|
|
|
controllers = strv_uniq(controllers);
|
|
|
|
if (!controllers)
|
|
return controllers;
|
|
|
|
for (f = controllers, t = controllers; *f; f++) {
|
|
int r;
|
|
const char *p;
|
|
|
|
if (streq(*f, "systemd") || streq(*f, SYSTEMD_CGROUP_CONTROLLER)) {
|
|
free(*f);
|
|
continue;
|
|
}
|
|
|
|
p = normalize_controller(*f);
|
|
|
|
r = check(p);
|
|
if (r < 0) {
|
|
log_debug("Controller %s is not available, removing from controllers list.", *f);
|
|
free(*f);
|
|
continue;
|
|
}
|
|
|
|
*(t++) = *f;
|
|
}
|
|
|
|
*t = NULL;
|
|
return controllers;
|
|
}
|
|
|
|
int cg_pid_get_cgroup(pid_t pid, char **root, char **cgroup) {
|
|
char *cg_process, *cg_init, *p;
|
|
int r;
|
|
|
|
assert(pid >= 0);
|
|
|
|
if (pid == 0)
|
|
pid = getpid();
|
|
|
|
r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &cg_process);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 1, &cg_init);
|
|
if (r < 0) {
|
|
free(cg_process);
|
|
return r;
|
|
}
|
|
|
|
if (endswith(cg_init, "/system"))
|
|
cg_init[strlen(cg_init)-7] = 0;
|
|
else if (streq(cg_init, "/"))
|
|
cg_init[0] = 0;
|
|
|
|
if (startswith(cg_process, cg_init))
|
|
p = cg_process + strlen(cg_init);
|
|
else
|
|
p = cg_process;
|
|
|
|
free(cg_init);
|
|
|
|
if (cgroup) {
|
|
char* c;
|
|
|
|
c = strdup(p);
|
|
if (!c) {
|
|
free(cg_process);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
*cgroup = c;
|
|
}
|
|
|
|
if (root) {
|
|
cg_process[p-cg_process] = 0;
|
|
*root = cg_process;
|
|
} else
|
|
free(cg_process);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cg_pid_get_unit(pid_t pid, char **unit) {
|
|
int r;
|
|
char *cgroup, *p, *at, *b;
|
|
size_t k;
|
|
|
|
assert(pid >= 0);
|
|
assert(unit);
|
|
|
|
r = cg_pid_get_cgroup(pid, NULL, &cgroup);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (!startswith(cgroup, "/system/")) {
|
|
free(cgroup);
|
|
return -ENOENT;
|
|
}
|
|
|
|
p = cgroup + 8;
|
|
k = strcspn(p, "/");
|
|
|
|
at = memchr(p, '@', k);
|
|
if (at && at[1] == '.') {
|
|
size_t j;
|
|
|
|
/* This is a templated service */
|
|
if (p[k] != '/') {
|
|
free(cgroup);
|
|
return -EIO;
|
|
}
|
|
|
|
j = strcspn(p+k+1, "/");
|
|
|
|
b = malloc(k + j + 1);
|
|
|
|
if (b) {
|
|
memcpy(b, p, at - p + 1);
|
|
memcpy(b + (at - p) + 1, p + k + 1, j);
|
|
memcpy(b + (at - p) + 1 + j, at + 1, k - (at - p) - 1);
|
|
b[k+j] = 0;
|
|
}
|
|
} else
|
|
b = strndup(p, k);
|
|
|
|
free(cgroup);
|
|
|
|
if (!b)
|
|
return -ENOMEM;
|
|
|
|
*unit = b;
|
|
return 0;
|
|
|
|
}
|