+++ /dev/null
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-/***
- This file is part of systemd.
-
- Copyright 2010 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include <errno.h>
-#include <unistd.h>
-#include <signal.h>
-#include <string.h>
-#include <stdlib.h>
-#include <dirent.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <ftw.h>
-
-#include "cgroup-util.h"
-#include "set.h"
-#include "macro.h"
-#include "util.h"
-#include "formats-util.h"
-#include "process-util.h"
-#include "path-util.h"
-#include "unit-name.h"
-#include "fileio.h"
-#include "special.h"
-#include "mkdir.h"
-#include "login-shared.h"
-
-int cg_enumerate_processes(const char *controller, const char *path, FILE **_f) {
- _cleanup_free_ char *fs = NULL;
- FILE *f;
- int r;
-
- assert(_f);
-
- r = cg_get_path(controller, path, "cgroup.procs", &fs);
- if (r < 0)
- return r;
-
- f = fopen(fs, "re");
- if (!f)
- return -errno;
-
- *_f = f;
- return 0;
-}
-
-int cg_read_pid(FILE *f, pid_t *_pid) {
- unsigned long ul;
-
- /* Note that the cgroup.procs might contain duplicates! See
- * cgroups.txt for details. */
-
- assert(f);
- assert(_pid);
-
- errno = 0;
- if (fscanf(f, "%lu", &ul) != 1) {
-
- if (feof(f))
- return 0;
-
- return errno ? -errno : -EIO;
- }
-
- if (ul <= 0)
- return -EIO;
-
- *_pid = (pid_t) ul;
- return 1;
-}
-
-int cg_enumerate_subgroups(const char *controller, const char *path, DIR **_d) {
- _cleanup_free_ char *fs = NULL;
- int r;
- DIR *d;
-
- assert(_d);
-
- /* This is not recursive! */
-
- r = cg_get_path(controller, path, NULL, &fs);
- if (r < 0)
- return r;
-
- d = opendir(fs);
- if (!d)
- return -errno;
-
- *_d = d;
- return 0;
-}
-
-int cg_read_subgroup(DIR *d, char **fn) {
- struct dirent *de;
-
- assert(d);
- assert(fn);
-
- FOREACH_DIRENT(de, d, return -errno) {
- char *b;
-
- if (de->d_type != DT_DIR)
- continue;
-
- if (streq(de->d_name, ".") ||
- streq(de->d_name, ".."))
- continue;
-
- b = strdup(de->d_name);
- if (!b)
- return -ENOMEM;
-
- *fn = b;
- return 1;
- }
-
- return 0;
-}
-
-int cg_rmdir(const char *controller, const char *path) {
- _cleanup_free_ char *p = NULL;
- int r;
-
- r = cg_get_path(controller, path, NULL, &p);
- if (r < 0)
- return r;
-
- r = rmdir(p);
- if (r < 0 && errno != ENOENT)
- return -errno;
-
- return 0;
-}
-
-int cg_kill(const char *controller, const char *path, int sig, bool sigcont, bool ignore_self, Set *s) {
- _cleanup_set_free_ Set *allocated_set = NULL;
- bool done = false;
- int r, ret = 0;
- pid_t my_pid;
-
- assert(sig >= 0);
-
- /* This goes through the tasks list and kills them all. This
- * is repeated until no further processes are added to the
- * tasks list, to properly handle forking processes */
-
- if (!s) {
- s = allocated_set = set_new(NULL);
- if (!s)
- return -ENOMEM;
- }
-
- my_pid = getpid();
-
- do {
- _cleanup_fclose_ FILE *f = NULL;
- pid_t pid = 0;
- done = true;
-
- r = cg_enumerate_processes(controller, path, &f);
- if (r < 0) {
- if (ret >= 0 && r != -ENOENT)
- return r;
-
- return ret;
- }
-
- while ((r = cg_read_pid(f, &pid)) > 0) {
-
- if (ignore_self && pid == my_pid)
- continue;
-
- if (set_get(s, LONG_TO_PTR(pid)) == LONG_TO_PTR(pid))
- continue;
-
- /* If we haven't killed this process yet, kill
- * it */
- if (kill(pid, sig) < 0) {
- if (ret >= 0 && errno != ESRCH)
- ret = -errno;
- } else {
- if (sigcont && sig != SIGKILL)
- kill(pid, SIGCONT);
-
- if (ret == 0)
- ret = 1;
- }
-
- done = false;
-
- r = set_put(s, LONG_TO_PTR(pid));
- if (r < 0) {
- if (ret >= 0)
- return r;
-
- return ret;
- }
- }
-
- if (r < 0) {
- if (ret >= 0)
- return r;
-
- return ret;
- }
-
- /* To avoid racing against processes which fork
- * quicker than we can kill them we repeat this until
- * no new pids need to be killed. */
-
- } while (!done);
-
- return ret;
-}
-
-int cg_kill_recursive(const char *controller, const char *path, int sig, bool sigcont, bool ignore_self, bool rem, Set *s) {
- _cleanup_set_free_ Set *allocated_set = NULL;
- _cleanup_closedir_ DIR *d = NULL;
- int r, ret = 0;
- char *fn;
-
- assert(path);
- assert(sig >= 0);
-
- if (!s) {
- s = allocated_set = set_new(NULL);
- if (!s)
- return -ENOMEM;
- }
-
- ret = cg_kill(controller, path, sig, sigcont, ignore_self, s);
-
- r = cg_enumerate_subgroups(controller, path, &d);
- if (r < 0) {
- if (ret >= 0 && r != -ENOENT)
- return r;
-
- return ret;
- }
-
- while ((r = cg_read_subgroup(d, &fn)) > 0) {
- _cleanup_free_ char *p = NULL;
-
- p = strjoin(path, "/", fn, NULL);
- free(fn);
- if (!p)
- return -ENOMEM;
-
- r = cg_kill_recursive(controller, p, sig, sigcont, ignore_self, rem, s);
- if (ret >= 0 && r != 0)
- ret = r;
- }
-
- if (ret >= 0 && r < 0)
- ret = r;
-
- if (rem) {
- r = cg_rmdir(controller, path);
- if (r < 0 && ret >= 0 && r != -ENOENT && r != -EBUSY)
- return r;
- }
-
- return ret;
-}
-
-int cg_migrate(const char *cfrom, const char *pfrom, const char *cto, const char *pto, bool ignore_self) {
- bool done = false;
- _cleanup_set_free_ Set *s = NULL;
- int r, ret = 0;
- pid_t my_pid;
-
- assert(cfrom);
- assert(pfrom);
- assert(cto);
- assert(pto);
-
- s = set_new(NULL);
- if (!s)
- return -ENOMEM;
-
- my_pid = getpid();
-
- do {
- _cleanup_fclose_ FILE *f = NULL;
- pid_t pid = 0;
- done = true;
-
- r = cg_enumerate_processes(cfrom, pfrom, &f);
- if (r < 0) {
- if (ret >= 0 && r != -ENOENT)
- return r;
-
- return ret;
- }
-
- while ((r = cg_read_pid(f, &pid)) > 0) {
-
- /* This might do weird stuff if we aren't a
- * single-threaded program. However, we
- * luckily know we are not */
- if (ignore_self && pid == my_pid)
- continue;
-
- if (set_get(s, LONG_TO_PTR(pid)) == LONG_TO_PTR(pid))
- continue;
-
- r = cg_attach(cto, pto, pid);
- if (r < 0) {
- if (ret >= 0 && r != -ESRCH)
- ret = r;
- } else if (ret == 0)
- ret = 1;
-
- done = false;
-
- r = set_put(s, LONG_TO_PTR(pid));
- if (r < 0) {
- if (ret >= 0)
- return r;
-
- return ret;
- }
- }
-
- if (r < 0) {
- if (ret >= 0)
- return r;
-
- return ret;
- }
- } while (!done);
-
- return ret;
-}
-
-int cg_migrate_recursive(
- const char *cfrom,
- const char *pfrom,
- const char *cto,
- const char *pto,
- bool ignore_self,
- bool rem) {
-
- _cleanup_closedir_ DIR *d = NULL;
- int r, ret = 0;
- char *fn;
-
- assert(cfrom);
- assert(pfrom);
- assert(cto);
- assert(pto);
-
- ret = cg_migrate(cfrom, pfrom, cto, pto, ignore_self);
-
- r = cg_enumerate_subgroups(cfrom, pfrom, &d);
- if (r < 0) {
- if (ret >= 0 && r != -ENOENT)
- return r;
-
- return ret;
- }
-
- while ((r = cg_read_subgroup(d, &fn)) > 0) {
- _cleanup_free_ char *p = NULL;
-
- p = strjoin(pfrom, "/", fn, NULL);
- free(fn);
- if (!p) {
- if (ret >= 0)
- return -ENOMEM;
-
- return ret;
- }
-
- r = cg_migrate_recursive(cfrom, p, cto, pto, ignore_self, rem);
- if (r != 0 && ret >= 0)
- ret = r;
- }
-
- if (r < 0 && ret >= 0)
- ret = r;
-
- if (rem) {
- r = cg_rmdir(cfrom, pfrom);
- if (r < 0 && ret >= 0 && r != -ENOENT && r != -EBUSY)
- return r;
- }
-
- return ret;
-}
-
-int cg_migrate_recursive_fallback(
- const char *cfrom,
- const char *pfrom,
- const char *cto,
- const char *pto,
- bool ignore_self,
- bool rem) {
-
- int r;
-
- assert(cfrom);
- assert(pfrom);
- assert(cto);
- assert(pto);
-
- r = cg_migrate_recursive(cfrom, pfrom, cto, pto, ignore_self, rem);
- if (r < 0) {
- char prefix[strlen(pto) + 1];
-
- /* This didn't work? Then let's try all prefixes of the destination */
-
- PATH_FOREACH_PREFIX(prefix, pto) {
- r = cg_migrate_recursive(cfrom, pfrom, cto, prefix, ignore_self, rem);
- if (r >= 0)
- break;
- }
- }
-
- return 0;
-}
-
-static const char *normalize_controller(const char *controller) {
-
- assert(controller);
-
- if (startswith(controller, "name="))
- return controller + 5;
- else
- return controller;
-}
-
-static int join_path(const char *controller, const char *path, const char *suffix, char **fs) {
- char *t = NULL;
-
- if (!isempty(controller)) {
- if (!isempty(path) && !isempty(suffix))
- t = strjoin("/sys/fs/cgroup/", controller, "/", path, "/", suffix, NULL);
- else if (!isempty(path))
- t = strjoin("/sys/fs/cgroup/", controller, "/", path, NULL);
- else if (!isempty(suffix))
- t = strjoin("/sys/fs/cgroup/", controller, "/", suffix, NULL);
- else
- t = strappend("/sys/fs/cgroup/", controller);
- } else {
- if (!isempty(path) && !isempty(suffix))
- t = strjoin(path, "/", suffix, NULL);
- else if (!isempty(path))
- t = strdup(path);
- else
- return -EINVAL;
- }
-
- if (!t)
- return -ENOMEM;
-
- *fs = path_kill_slashes(t);
- return 0;
-}
-
-int cg_get_path(const char *controller, const char *path, const char *suffix, char **fs) {
- const char *p;
- static thread_local bool good = false;
-
- assert(fs);
-
- if (controller && !cg_controller_is_valid(controller))
- return -EINVAL;
-
- if (_unlikely_(!good)) {
- int r;
-
- r = path_is_mount_point("/sys/fs/cgroup", 0);
- if (r < 0)
- return r;
- if (r == 0)
- return -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_hierarchy(const char *p) {
- const char *cc;
-
- assert(p);
-
- if (!filename_is_valid(p))
- return 0;
-
- /* Check if this controller actually really exists */
- cc = strjoina("/sys/fs/cgroup/", p);
- if (laccess(cc, F_OK) < 0)
- return -errno;
-
- return 0;
-}
-
-int cg_get_path_and_check(const char *controller, const char *path, const char *suffix, char **fs) {
- const char *p;
- int r;
-
- assert(fs);
-
- if (!cg_controller_is_valid(controller))
- return -EINVAL;
-
- /* Normalize the controller syntax */
- p = normalize_controller(controller);
-
- /* Check if this controller actually really exists */
- r = check_hierarchy(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) {
- assert(path);
- assert(sb);
- assert(ftwbuf);
-
- if (typeflag != FTW_DP)
- return 0;
-
- if (ftwbuf->level < 1)
- return 0;
-
- rmdir(path);
- return 0;
-}
-
-int cg_trim(const char *controller, const char *path, bool delete_root) {
- _cleanup_free_ char *fs = NULL;
- int r = 0;
-
- assert(path);
-
- r = cg_get_path(controller, path, NULL, &fs);
- if (r < 0)
- return r;
-
- errno = 0;
- if (nftw(fs, trim_cb, 64, FTW_DEPTH|FTW_MOUNT|FTW_PHYS) != 0)
- r = errno ? -errno : -EIO;
-
- if (delete_root) {
- if (rmdir(fs) < 0 && errno != ENOENT)
- return -errno;
- }
-
- return r;
-}
-
-int cg_delete(const char *controller, const char *path) {
- _cleanup_free_ char *parent = NULL;
- int r;
-
- assert(path);
-
- r = path_get_parent(path, &parent);
- if (r < 0)
- return r;
-
- r = cg_migrate_recursive(controller, path, controller, parent, false, true);
- return r == -ENOENT ? 0 : r;
-}
-
-int cg_create(const char *controller, const char *path) {
- _cleanup_free_ char *fs = NULL;
- int r;
-
- r = cg_get_path_and_check(controller, path, NULL, &fs);
- if (r < 0)
- return r;
-
- r = mkdir_parents(fs, 0755);
- if (r < 0)
- return r;
-
- if (mkdir(fs, 0755) < 0) {
-
- if (errno == EEXIST)
- return 0;
-
- return -errno;
- }
-
- return 1;
-}
-
-int cg_create_and_attach(const char *controller, const char *path, pid_t pid) {
- int r, q;
-
- assert(pid >= 0);
-
- r = cg_create(controller, path);
- if (r < 0)
- return r;
-
- q = cg_attach(controller, path, pid);
- if (q < 0)
- return q;
-
- /* This does not remove the cgroup on failure */
- return r;
-}
-
-int cg_attach(const char *controller, const char *path, pid_t pid) {
- _cleanup_free_ char *fs = NULL;
- char c[DECIMAL_STR_MAX(pid_t) + 2];
- int r;
-
- assert(path);
- assert(pid >= 0);
-
- r = cg_get_path_and_check(controller, path, "cgroup.procs", &fs);
- if (r < 0)
- return r;
-
- if (pid == 0)
- pid = getpid();
-
- snprintf(c, sizeof(c), PID_FMT"\n", pid);
-
- return write_string_file_no_create(fs, c);
-}
-
-int cg_attach_fallback(const char *controller, const char *path, pid_t pid) {
- int r;
-
- assert(controller);
- assert(path);
- assert(pid >= 0);
-
- r = cg_attach(controller, path, pid);
- if (r < 0) {
- char prefix[strlen(path) + 1];
-
- /* This didn't work? Then let's try all prefixes of
- * the destination */
-
- PATH_FOREACH_PREFIX(prefix, path) {
- r = cg_attach(controller, prefix, pid);
- if (r >= 0)
- break;
- }
- }
-
- return 0;
-}
-
-int cg_set_group_access(
- const char *controller,
- const char *path,
- mode_t mode,
- uid_t uid,
- gid_t gid) {
-
- _cleanup_free_ char *fs = NULL;
- int r;
-
- assert(path);
-
- if (mode != MODE_INVALID)
- mode &= 0777;
-
- r = cg_get_path(controller, path, NULL, &fs);
- if (r < 0)
- return r;
-
- return chmod_and_chown(fs, mode, uid, gid);
-}
-
-int cg_set_task_access(
- const char *controller,
- const char *path,
- mode_t mode,
- uid_t uid,
- gid_t gid) {
-
- _cleanup_free_ char *fs = NULL, *procs = NULL;
- int r;
-
- assert(path);
-
- if (mode == MODE_INVALID && uid == UID_INVALID && gid == GID_INVALID)
- return 0;
-
- if (mode != MODE_INVALID)
- mode &= 0666;
-
- r = cg_get_path(controller, path, "cgroup.procs", &fs);
- if (r < 0)
- return r;
-
- r = chmod_and_chown(fs, mode, uid, gid);
- if (r < 0)
- return r;
-
- /* Compatibility, Always keep values for "tasks" in sync with
- * "cgroup.procs" */
- r = cg_get_path(controller, path, "tasks", &procs);
- if (r < 0)
- return r;
-
- return chmod_and_chown(procs, mode, uid, gid);
-}
-
-int cg_pid_get_path(const char *controller, pid_t pid, char **path) {
- _cleanup_fclose_ FILE *f = NULL;
- char line[LINE_MAX];
- const char *fs;
- size_t cs;
-
- assert(path);
- assert(pid >= 0);
-
- if (controller) {
- if (!cg_controller_is_valid(controller))
- return -EINVAL;
-
- controller = normalize_controller(controller);
- } else
- controller = SYSTEMD_CGROUP_CONTROLLER;
-
- fs = procfs_file_alloca(pid, "cgroup");
-
- f = fopen(fs, "re");
- if (!f)
- return errno == ENOENT ? -ESRCH : -errno;
-
- cs = strlen(controller);
-
- FOREACH_LINE(line, f, return -errno) {
- char *l, *p, *e;
- size_t k;
- const char *word, *state;
- bool found = false;
-
- truncate_nl(line);
-
- l = strchr(line, ':');
- if (!l)
- continue;
-
- l++;
- e = strchr(l, ':');
- if (!e)
- continue;
-
- *e = 0;
-
- FOREACH_WORD_SEPARATOR(word, k, l, ",", state) {
-
- if (k == cs && memcmp(word, controller, cs) == 0) {
- found = true;
- break;
- }
-
- if (k == 5 + cs &&
- memcmp(word, "name=", 5) == 0 &&
- memcmp(word+5, controller, cs) == 0) {
- found = true;
- break;
- }
- }
-
- if (!found)
- continue;
-
- p = strdup(e + 1);
- if (!p)
- return -ENOMEM;
-
- *path = p;
- return 0;
- }
-
- return -ENOENT;
-}
-
-int cg_install_release_agent(const char *controller, const char *agent) {
- _cleanup_free_ char *fs = NULL, *contents = NULL;
- char *sc;
- int r;
-
- assert(agent);
-
- 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 (sc[0] == 0) {
- r = write_string_file_no_create(fs, agent);
- if (r < 0)
- return r;
- } else if (!streq(sc, agent))
- return -EEXIST;
-
- free(fs);
- fs = NULL;
- r = cg_get_path(controller, NULL, "notify_on_release", &fs);
- if (r < 0)
- return r;
-
- free(contents);
- contents = NULL;
- r = read_one_line_file(fs, &contents);
- if (r < 0)
- return r;
-
- sc = strstrip(contents);
- if (streq(sc, "0")) {
- r = write_string_file_no_create(fs, "1");
- 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_get_path(controller, NULL, "notify_on_release", &fs);
- if (r < 0)
- return r;
-
- r = write_string_file_no_create(fs, "0");
- if (r < 0)
- return r;
-
- free(fs);
- fs = NULL;
-
- r = cg_get_path(controller, NULL, "release_agent", &fs);
- if (r < 0)
- return r;
-
- r = write_string_file_no_create(fs, "");
- if (r < 0)
- return r;
-
- return 0;
-}
-
-int cg_is_empty(const char *controller, const char *path, bool ignore_self) {
- _cleanup_fclose_ FILE *f = NULL;
- pid_t pid = 0, self_pid;
- bool found = false;
- int r;
-
- assert(path);
-
- r = cg_enumerate_processes(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;
- }
-
- if (r < 0)
- return r;
-
- return !found;
-}
-
-int cg_is_empty_recursive(const char *controller, const char *path, bool ignore_self) {
- _cleanup_closedir_ DIR *d = NULL;
- char *fn;
- int r;
-
- 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) {
- _cleanup_free_ char *p = NULL;
-
- p = strjoin(path, "/", fn, NULL);
- free(fn);
- if (!p)
- return -ENOMEM;
-
- r = cg_is_empty_recursive(controller, p, ignore_self);
- if (r <= 0)
- return r;
- }
-
- if (r < 0)
- return r;
-
- return 1;
-}
-
-int cg_split_spec(const char *spec, char **controller, char **path) {
- const char *e;
- char *t = NULL, *u = NULL;
- _cleanup_free_ char *v = NULL;
-
- assert(spec);
-
- if (*spec == '/') {
- if (!path_is_safe(spec))
- return -EINVAL;
-
- if (path) {
- t = strdup(spec);
- if (!t)
- return -ENOMEM;
-
- *path = path_kill_slashes(t);
- }
-
- if (controller)
- *controller = NULL;
-
- return 0;
- }
-
- e = strchr(spec, ':');
- if (!e) {
- if (!cg_controller_is_valid(spec))
- return -EINVAL;
-
- if (controller) {
- t = strdup(normalize_controller(spec));
- if (!t)
- return -ENOMEM;
-
- *controller = t;
- }
-
- if (path)
- *path = NULL;
-
- return 0;
- }
-
- v = strndup(spec, e-spec);
- if (!v)
- return -ENOMEM;
- t = strdup(normalize_controller(v));
- if (!t)
- return -ENOMEM;
- if (!cg_controller_is_valid(t)) {
- free(t);
- return -EINVAL;
- }
-
- if (streq(e+1, "")) {
- u = strdup("/");
- if (!u) {
- free(t);
- return -ENOMEM;
- }
- } else {
- u = strdup(e+1);
- if (!u) {
- free(t);
- return -ENOMEM;
- }
-
- if (!path_is_safe(u) ||
- !path_is_absolute(u)) {
- free(t);
- free(u);
- return -EINVAL;
- }
-
- path_kill_slashes(u);
- }
-
- if (controller)
- *controller = t;
- else
- free(t);
-
- if (path)
- *path = u;
- else
- free(u);
-
- return 0;
-}
-
-int cg_mangle_path(const char *path, char **result) {
- _cleanup_free_ char *c = NULL, *p = NULL;
- char *t;
- int r;
-
- assert(path);
- assert(result);
-
- /* First, check if it already is a filesystem path */
- if (path_startswith(path, "/sys/fs/cgroup")) {
-
- t = strdup(path);
- if (!t)
- return -ENOMEM;
-
- *result = path_kill_slashes(t);
- return 0;
- }
-
- /* Otherwise, treat it as cg spec */
- r = cg_split_spec(path, &c, &p);
- if (r < 0)
- return r;
-
- return cg_get_path(c ? c : SYSTEMD_CGROUP_CONTROLLER, p ? 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_SYSTEM_SLICE);
- 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)
- *shifted = p - 1;
- else
- *shifted = cgroup;
-
- return 0;
-}
-
-int cg_pid_get_path_shifted(pid_t pid, const char *root, char **cgroup) {
- _cleanup_free_ char *raw = NULL;
- const char *c;
- int r;
-
- assert(pid >= 0);
- assert(cgroup);
-
- r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &raw);
- if (r < 0)
- return r;
-
- r = cg_shift_path(raw, root, &c);
- if (r < 0)
- return r;
-
- if (c == raw) {
- *cgroup = raw;
- raw = NULL;
- } else {
- char *n;
-
- n = strdup(c);
- if (!n)
- return -ENOMEM;
-
- *cgroup = n;
- }
-
- return 0;
-}
-
-int cg_path_decode_unit(const char *cgroup, char **unit){
- char *c, *s;
- size_t n;
-
- assert(cgroup);
- assert(unit);
-
- n = strcspn(cgroup, "/");
- if (n < 3)
- return -ENXIO;
-
- c = strndupa(cgroup, n);
- c = cg_unescape(c);
-
- if (!unit_name_is_valid(c, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE))
- return -ENXIO;
-
- s = strdup(c);
- if (!s)
- return -ENOMEM;
-
- *unit = s;
- return 0;
-}
-
-static bool valid_slice_name(const char *p, size_t n) {
-
- if (!p)
- return false;
-
- if (n < strlen("x.slice"))
- return false;
-
- if (memcmp(p + n - 6, ".slice", 6) == 0) {
- char buf[n+1], *c;
-
- memcpy(buf, p, n);
- buf[n] = 0;
-
- c = cg_unescape(buf);
-
- return unit_name_is_valid(c, UNIT_NAME_PLAIN);
- }
-
- return false;
-}
-
-static const char *skip_slices(const char *p) {
- assert(p);
-
- /* Skips over all slice assignments */
-
- for (;;) {
- size_t n;
-
- p += strspn(p, "/");
-
- n = strcspn(p, "/");
- if (!valid_slice_name(p, n))
- return p;
-
- p += n;
- }
-}
-
-int cg_path_get_unit(const char *path, char **ret) {
- const char *e;
- char *unit;
- int r;
-
- assert(path);
- assert(ret);
-
- e = skip_slices(path);
-
- r = cg_path_decode_unit(e, &unit);
- if (r < 0)
- return r;
-
- /* We skipped over the slices, don't accept any now */
- if (endswith(unit, ".slice")) {
- free(unit);
- return -ENXIO;
- }
-
- *ret = unit;
- return 0;
-}
-
-int cg_pid_get_unit(pid_t pid, char **unit) {
- _cleanup_free_ char *cgroup = NULL;
- int r;
-
- assert(unit);
-
- r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
- if (r < 0)
- return r;
-
- return cg_path_get_unit(cgroup, unit);
-}
-
-/**
- * Skip session-*.scope, but require it to be there.
- */
-static const char *skip_session(const char *p) {
- size_t n;
-
- if (isempty(p))
- return NULL;
-
- p += strspn(p, "/");
-
- n = strcspn(p, "/");
- if (n < strlen("session-x.scope"))
- return NULL;
-
- if (memcmp(p, "session-", 8) == 0 && memcmp(p + n - 6, ".scope", 6) == 0) {
- char buf[n - 8 - 6 + 1];
-
- memcpy(buf, p + 8, n - 8 - 6);
- buf[n - 8 - 6] = 0;
-
- /* Note that session scopes never need unescaping,
- * since they cannot conflict with the kernel's own
- * names, hence we don't need to call cg_unescape()
- * here. */
-
- if (!session_id_valid(buf))
- return false;
-
- p += n;
- p += strspn(p, "/");
- return p;
- }
-
- return NULL;
-}
-
-/**
- * Skip user@*.service, but require it to be there.
- */
-static const char *skip_user_manager(const char *p) {
- size_t n;
-
- if (isempty(p))
- return NULL;
-
- p += strspn(p, "/");
-
- n = strcspn(p, "/");
- if (n < strlen("user@x.service"))
- return NULL;
-
- if (memcmp(p, "user@", 5) == 0 && memcmp(p + n - 8, ".service", 8) == 0) {
- char buf[n - 5 - 8 + 1];
-
- memcpy(buf, p + 5, n - 5 - 8);
- buf[n - 5 - 8] = 0;
-
- /* Note that user manager services never need unescaping,
- * since they cannot conflict with the kernel's own
- * names, hence we don't need to call cg_unescape()
- * here. */
-
- if (parse_uid(buf, NULL) < 0)
- return NULL;
-
- p += n;
- p += strspn(p, "/");
-
- return p;
- }
-
- return NULL;
-}
-
-static const char *skip_user_prefix(const char *path) {
- const char *e, *t;
-
- assert(path);
-
- /* Skip slices, if there are any */
- e = skip_slices(path);
-
- /* Skip the user manager, if it's in the path now... */
- t = skip_user_manager(e);
- if (t)
- return t;
-
- /* Alternatively skip the user session if it is in the path... */
- return skip_session(e);
-}
-
-int cg_path_get_user_unit(const char *path, char **ret) {
- const char *t;
-
- assert(path);
- assert(ret);
-
- t = skip_user_prefix(path);
- if (!t)
- return -ENXIO;
-
- /* And from here on it looks pretty much the same as for a
- * system unit, hence let's use the same parser from here
- * on. */
- return cg_path_get_unit(t, ret);
-}
-
-int cg_pid_get_user_unit(pid_t pid, char **unit) {
- _cleanup_free_ char *cgroup = NULL;
- int r;
-
- assert(unit);
-
- r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
- if (r < 0)
- return r;
-
- return cg_path_get_user_unit(cgroup, unit);
-}
-
-int cg_path_get_machine_name(const char *path, char **machine) {
- _cleanup_free_ char *u = NULL, *sl = NULL;
- int r;
-
- r = cg_path_get_unit(path, &u);
- if (r < 0)
- return r;
-
- sl = strjoin("/run/systemd/machines/unit:", u, NULL);
- if (!sl)
- return -ENOMEM;
-
- 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("-.slice");
- if (!s)
- return -ENOMEM;
-
- *slice = s;
- return 0;
- }
-
- return cg_path_decode_unit(e, slice);
- }
-
- e = p;
- p += n;
- }
-}
-
-int cg_pid_get_slice(pid_t pid, char **slice) {
- _cleanup_free_ char *cgroup = NULL;
- int r;
-
- assert(slice);
-
- r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
- if (r < 0)
- return r;
-
- return cg_path_get_slice(cgroup, slice);
-}
-
-int cg_path_get_user_slice(const char *p, char **slice) {
- const char *t;
- assert(p);
- assert(slice);
-
- t = skip_user_prefix(p);
- if (!t)
- return -ENXIO;
-
- /* And now it looks pretty much the same as for a system
- * slice, so let's just use the same parser from here on. */
- return cg_path_get_slice(t, slice);
-}
-
-int cg_pid_get_user_slice(pid_t pid, char **slice) {
- _cleanup_free_ char *cgroup = NULL;
- int r;
-
- assert(slice);
-
- r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
- if (r < 0)
- return r;
-
- return cg_path_get_user_slice(cgroup, slice);
-}
-
-char *cg_escape(const char *p) {
- bool need_prefix = false;
-
- /* This implements very minimal escaping for names to be used
- * as file names in the cgroup tree: any name which might
- * conflict with a kernel name or is prefixed with '_' is
- * prefixed with a '_'. That way, when reading cgroup names it
- * is sufficient to remove a single prefixing underscore if
- * there is one. */
-
- /* The return value of this function (unlike cg_unescape())
- * needs free()! */
-
- if (p[0] == 0 ||
- p[0] == '_' ||
- p[0] == '.' ||
- streq(p, "notify_on_release") ||
- streq(p, "release_agent") ||
- streq(p, "tasks"))
- need_prefix = true;
- else {
- const char *dot;
-
- dot = strrchr(p, '.');
- if (dot) {
-
- if (dot - p == 6 && memcmp(p, "cgroup", 6) == 0)
- need_prefix = true;
- else {
- char *n;
-
- n = strndupa(p, dot - p);
-
- if (check_hierarchy(n) >= 0)
- need_prefix = true;
- }
- }
- }
-
- if (need_prefix)
- return strappend("_", p);
- else
- return strdup(p);
-}
-
-char *cg_unescape(const char *p) {
- assert(p);
-
- /* The return value of this function (unlike cg_escape())
- * doesn't need free()! */
-
- if (p[0] == '_')
- return (char*) p+1;
-
- return (char*) p;
-}
-
-#define CONTROLLER_VALID \
- DIGITS LETTERS \
- "_"
-
-bool cg_controller_is_valid(const char *p) {
- const char *t, *s;
-
- if (!p)
- return false;
-
- s = startswith(p, "name=");
- if (s)
- p = s;
-
- if (*p == 0 || *p == '_')
- return false;
-
- for (t = p; *t; t++)
- if (!strchr(CONTROLLER_VALID, *t))
- return false;
-
- if (t - p > FILENAME_MAX)
- return false;
-
- return true;
-}
-
-int cg_slice_to_path(const char *unit, char **ret) {
- _cleanup_free_ char *p = NULL, *s = NULL, *e = NULL;
- const char *dash;
- int r;
-
- assert(unit);
- assert(ret);
-
- if (streq(unit, "-.slice")) {
- char *x;
-
- x = strdup("");
- if (!x)
- return -ENOMEM;
- *ret = x;
- return 0;
- }
-
- if (!unit_name_is_valid(unit, UNIT_NAME_PLAIN))
- return -EINVAL;
-
- if (!endswith(unit, ".slice"))
- return -EINVAL;
-
- r = unit_name_to_prefix(unit, &p);
- if (r < 0)
- return r;
-
- dash = strchr(p, '-');
-
- /* Don't allow initial dashes */
- if (dash == p)
- return -EINVAL;
-
- while (dash) {
- _cleanup_free_ char *escaped = NULL;
- char n[dash - p + sizeof(".slice")];
-
- /* Don't allow trailing or double dashes */
- if (dash[1] == 0 || dash[1] == '-')
- return -EINVAL;
-
- strcpy(stpncpy(n, p, dash - p), ".slice");
- if (!unit_name_is_valid(n, UNIT_NAME_PLAIN))
- return -EINVAL;
-
- escaped = cg_escape(n);
- if (!escaped)
- return -ENOMEM;
-
- if (!strextend(&s, escaped, "/", NULL))
- return -ENOMEM;
-
- dash = strchr(dash+1, '-');
- }
-
- e = cg_escape(unit);
- if (!e)
- return -ENOMEM;
-
- if (!strextend(&s, e, NULL))
- return -ENOMEM;
-
- *ret = s;
- s = NULL;
-
- return 0;
-}
-
-int cg_set_attribute(const char *controller, const char *path, const char *attribute, const char *value) {
- _cleanup_free_ char *p = NULL;
- int r;
-
- r = cg_get_path(controller, path, attribute, &p);
- if (r < 0)
- return r;
-
- return write_string_file_no_create(p, value);
-}
-
-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);
-}
-
-static const char mask_names[] =
- "cpu\0"
- "cpuacct\0"
- "blkio\0"
- "memory\0"
- "devices\0";
-
-int cg_create_everywhere(CGroupControllerMask supported, CGroupControllerMask mask, const char *path) {
- CGroupControllerMask bit = 1;
- const char *n;
- int r;
-
- /* This one will create a cgroup in our private tree, but also
- * duplicate it in the trees specified in mask, and remove it
- * in all others */
-
- /* First create the cgroup in our own hierarchy. */
- r = cg_create(SYSTEMD_CGROUP_CONTROLLER, path);
- if (r < 0)
- return r;
-
- /* Then, do the same in the other hierarchies */
- NULSTR_FOREACH(n, mask_names) {
- if (mask & bit)
- cg_create(n, path);
- else if (supported & bit)
- cg_trim(n, path, true);
-
- bit <<= 1;
- }
-
- return 0;
-}
-
-int cg_attach_everywhere(CGroupControllerMask supported, const char *path, pid_t pid, cg_migrate_callback_t path_callback, void *userdata) {
- CGroupControllerMask bit = 1;
- const char *n;
- int r;
-
- r = cg_attach(SYSTEMD_CGROUP_CONTROLLER, path, pid);
- if (r < 0)
- return r;
-
- NULSTR_FOREACH(n, mask_names) {
-
- if (supported & bit) {
- const char *p = NULL;
-
- if (path_callback)
- p = path_callback(bit, userdata);
-
- if (!p)
- p = path;
-
- cg_attach_fallback(n, path, pid);
- }
-
- bit <<= 1;
- }
-
- return 0;
-}
-
-int cg_attach_many_everywhere(CGroupControllerMask supported, const char *path, Set* pids, cg_migrate_callback_t path_callback, void *userdata) {
- Iterator i;
- void *pidp;
- int r = 0;
-
- SET_FOREACH(pidp, pids, i) {
- pid_t pid = PTR_TO_LONG(pidp);
- int q;
-
- q = cg_attach_everywhere(supported, path, pid, path_callback, userdata);
- if (q < 0)
- r = q;
- }
-
- return r;
-}
-
-int cg_migrate_everywhere(CGroupControllerMask supported, const char *from, const char *to, cg_migrate_callback_t to_callback, void *userdata) {
- CGroupControllerMask bit = 1;
- const char *n;
- int r;
-
- if (!path_equal(from, to)) {
- r = cg_migrate_recursive(SYSTEMD_CGROUP_CONTROLLER, from, SYSTEMD_CGROUP_CONTROLLER, to, false, true);
- if (r < 0)
- return r;
- }
-
- NULSTR_FOREACH(n, mask_names) {
- if (supported & bit) {
- const char *p = NULL;
-
- if (to_callback)
- p = to_callback(bit, userdata);
-
- if (!p)
- p = to;
-
- cg_migrate_recursive_fallback(SYSTEMD_CGROUP_CONTROLLER, to, n, p, false, false);
- }
-
- bit <<= 1;
- }
-
- return 0;
-}
-
-int cg_trim_everywhere(CGroupControllerMask supported, const char *path, bool delete_root) {
- CGroupControllerMask bit = 1;
- const char *n;
- int r;
-
- r = cg_trim(SYSTEMD_CGROUP_CONTROLLER, path, delete_root);
- if (r < 0)
- return r;
-
- NULSTR_FOREACH(n, mask_names) {
- if (supported & bit)
- cg_trim(n, path, delete_root);
-
- bit <<= 1;
- }
-
- return 0;
-}
-
-CGroupControllerMask cg_mask_supported(void) {
- CGroupControllerMask bit = 1, mask = 0;
- const char *n;
-
- NULSTR_FOREACH(n, mask_names) {
- if (check_hierarchy(n) >= 0)
- mask |= bit;
-
- bit <<= 1;
- }
-
- return mask;
-}
-
-int cg_kernel_controllers(Set *controllers) {
- _cleanup_fclose_ FILE *f = NULL;
- char buf[LINE_MAX];
- int r;
-
- assert(controllers);
-
- f = fopen("/proc/cgroups", "re");
- if (!f) {
- if (errno == ENOENT)
- return 0;
- return -errno;
- }
-
- /* Ignore the header line */
- (void) fgets(buf, sizeof(buf), f);
-
- for (;;) {
- char *controller;
- int enabled = 0;
-
- errno = 0;
- if (fscanf(f, "%ms %*i %*i %i", &controller, &enabled) != 2) {
-
- if (feof(f))
- break;
-
- if (ferror(f) && errno)
- return -errno;
-
- return -EBADMSG;
- }
-
- if (!enabled) {
- free(controller);
- continue;
- }
-
- if (!filename_is_valid(controller)) {
- free(controller);
- return -EBADMSG;
- }
-
- r = set_consume(controllers, controller);
- if (r < 0)
- return r;
- }
-
- return 0;
-}
projects / thirdparty / systemd.git / blobdiff