| /*** |
| This file is part of systemd. |
| |
| Copyright 2010 Lennart Poettering |
| |
| systemd is free software; you can redistribute it and/or modify it |
| under the terms of the GNU Lesser General Public License as published by |
| the Free Software Foundation; either version 2.1 of the License, or |
| (at your option) any later version. |
| |
| systemd is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public License |
| along with systemd; If not, see <http://www.gnu.org/licenses/>. |
| ***/ |
| |
| #include <dirent.h> |
| #include <errno.h> |
| #include <ftw.h> |
| #include <limits.h> |
| #include <signal.h> |
| #include <stddef.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/stat.h> |
| #include <sys/statfs.h> |
| #include <sys/types.h> |
| #include <unistd.h> |
| |
| #include "alloc-util.h" |
| #include "cgroup-util.h" |
| #include "def.h" |
| #include "dirent-util.h" |
| #include "extract-word.h" |
| #include "fd-util.h" |
| #include "fileio.h" |
| #include "formats-util.h" |
| #include "fs-util.h" |
| #include "log.h" |
| #include "login-util.h" |
| #include "macro.h" |
| #include "missing.h" |
| #include "mkdir.h" |
| #include "parse-util.h" |
| #include "path-util.h" |
| #include "proc-cmdline.h" |
| #include "process-util.h" |
| #include "set.h" |
| #include "special.h" |
| #include "stat-util.h" |
| #include "stdio-util.h" |
| #include "string-table.h" |
| #include "string-util.h" |
| #include "unit-name.h" |
| #include "user-util.h" |
| |
| int cg_enumerate_processes(const char *controller, const char *path, FILE **_f) { |
| _cleanup_free_ char *fs = NULL; |
| FILE *f; |
| int r; |
| |
| assert(_f); |
| |
| r = cg_get_path(controller, path, "cgroup.procs", &fs); |
| if (r < 0) |
| return r; |
| |
| f = fopen(fs, "re"); |
| if (!f) |
| return -errno; |
| |
| *_f = f; |
| return 0; |
| } |
| |
| int cg_read_pid(FILE *f, pid_t *_pid) { |
| unsigned long ul; |
| |
| /* Note that the cgroup.procs might contain duplicates! See |
| * cgroups.txt for details. */ |
| |
| assert(f); |
| assert(_pid); |
| |
| errno = 0; |
| if (fscanf(f, "%lu", &ul) != 1) { |
| |
| if (feof(f)) |
| return 0; |
| |
| return errno > 0 ? -errno : -EIO; |
| } |
| |
| if (ul <= 0) |
| return -EIO; |
| |
| *_pid = (pid_t) ul; |
| return 1; |
| } |
| |
| int cg_read_event(const char *controller, const char *path, const char *event, |
| char **val) |
| { |
| _cleanup_free_ char *events = NULL, *content = NULL; |
| char *p, *line; |
| int r; |
| |
| r = cg_get_path(controller, path, "cgroup.events", &events); |
| if (r < 0) |
| return r; |
| |
| r = read_full_file(events, &content, NULL); |
| if (r < 0) |
| return r; |
| |
| p = content; |
| while ((line = strsep(&p, "\n"))) { |
| char *key; |
| |
| key = strsep(&line, " "); |
| if (!key || !line) |
| return -EINVAL; |
| |
| if (strcmp(key, event)) |
| continue; |
| |
| *val = strdup(line); |
| return 0; |
| } |
| |
| return -ENOENT; |
| } |
| |
| int cg_enumerate_subgroups(const char *controller, const char *path, DIR **_d) { |
| _cleanup_free_ char *fs = NULL; |
| int r; |
| DIR *d; |
| |
| assert(_d); |
| |
| /* This is not recursive! */ |
| |
| r = cg_get_path(controller, path, NULL, &fs); |
| if (r < 0) |
| return r; |
| |
| d = opendir(fs); |
| if (!d) |
| return -errno; |
| |
| *_d = d; |
| return 0; |
| } |
| |
| int cg_read_subgroup(DIR *d, char **fn) { |
| struct dirent *de; |
| |
| assert(d); |
| assert(fn); |
| |
| FOREACH_DIRENT_ALL(de, d, return -errno) { |
| char *b; |
| |
| if (de->d_type != DT_DIR) |
| continue; |
| |
| if (streq(de->d_name, ".") || |
| streq(de->d_name, "..")) |
| continue; |
| |
| b = strdup(de->d_name); |
| if (!b) |
| return -ENOMEM; |
| |
| *fn = b; |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| int cg_rmdir(const char *controller, const char *path) { |
| _cleanup_free_ char *p = NULL; |
| int r; |
| |
| r = cg_get_path(controller, path, NULL, &p); |
| if (r < 0) |
| return r; |
| |
| r = rmdir(p); |
| if (r < 0 && errno != ENOENT) |
| return -errno; |
| |
| return 0; |
| } |
| |
| int cg_kill(const char *controller, const char *path, int sig, 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, PID_TO_PTR(pid)) == PID_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) |
| (void) kill(pid, SIGCONT); |
| |
| if (ret == 0) |
| ret = 1; |
| } |
| |
| done = false; |
| |
| r = set_put(s, PID_TO_PTR(pid)); |
| if (r < 0) { |
| if (ret >= 0) |
| return r; |
| |
| return ret; |
| } |
| } |
| |
| if (r < 0) { |
| if (ret >= 0) |
| return r; |
| |
| return ret; |
| } |
| |
| /* To avoid racing against processes which fork |
| * quicker than we can kill them we repeat this until |
| * no new pids need to be killed. */ |
| |
| } while (!done); |
| |
| return ret; |
| } |
| |
| int cg_kill_recursive(const char *controller, const char *path, int sig, bool sigcont, bool ignore_self, bool rem, Set *s) { |
| _cleanup_set_free_ Set *allocated_set = NULL; |
| _cleanup_closedir_ DIR *d = NULL; |
| int r, ret; |
| char *fn; |
| |
| assert(path); |
| assert(sig >= 0); |
| |
| if (!s) { |
| s = allocated_set = set_new(NULL); |
| if (!s) |
| return -ENOMEM; |
| } |
| |
| ret = cg_kill(controller, path, sig, 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 (r != 0 && ret >= 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, PID_TO_PTR(pid)) == PID_TO_PTR(pid)) |
| continue; |
| |
| /* Ignore kernel threads. Since they can only |
| * exist in the root cgroup, we only check for |
| * them there. */ |
| if (cfrom && |
| (isempty(pfrom) || path_equal(pfrom, "/")) && |
| is_kernel_thread(pid) > 0) |
| continue; |
| |
| r = cg_attach(cto, pto, pid); |
| if (r < 0) { |
| if (ret >= 0 && r != -ESRCH) |
| ret = r; |
| } else if (ret == 0) |
| ret = 1; |
| |
| done = false; |
| |
| r = set_put(s, PID_TO_PTR(pid)); |
| if (r < 0) { |
| if (ret >= 0) |
| return r; |
| |
| return ret; |
| } |
| } |
| |
| if (r < 0) { |
| if (ret >= 0) |
| return r; |
| |
| return ret; |
| } |
| } while (!done); |
| |
| return ret; |
| } |
| |
| int cg_migrate_recursive( |
| const char *cfrom, |
| const char *pfrom, |
| const char *cto, |
| const char *pto, |
| 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) |
| return -ENOMEM; |
| |
| 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) { |
| int q; |
| |
| q = cg_migrate_recursive(cfrom, pfrom, cto, prefix, ignore_self, rem); |
| if (q >= 0) |
| return q; |
| } |
| } |
| |
| return r; |
| } |
| |
| static const char *controller_to_dirname(const char *controller) { |
| const char *e; |
| |
| assert(controller); |
| |
| /* Converts a controller name to the directory name below |
| * /sys/fs/cgroup/ we want to mount it to. Effectively, this |
| * just cuts off the name= prefixed used for named |
| * hierarchies, if it is specified. */ |
| |
| e = startswith(controller, "name="); |
| if (e) |
| return e; |
| |
| return controller; |
| } |
| |
| static int join_path_legacy(const char *controller, const char *path, const char *suffix, char **fs) { |
| const char *dn; |
| char *t = NULL; |
| |
| assert(fs); |
| assert(controller); |
| |
| dn = controller_to_dirname(controller); |
| |
| if (isempty(path) && isempty(suffix)) |
| t = strappend("/sys/fs/cgroup/", dn); |
| else if (isempty(path)) |
| t = strjoin("/sys/fs/cgroup/", dn, "/", suffix, NULL); |
| else if (isempty(suffix)) |
| t = strjoin("/sys/fs/cgroup/", dn, "/", path, NULL); |
| else |
| t = strjoin("/sys/fs/cgroup/", dn, "/", path, "/", suffix, NULL); |
| if (!t) |
| return -ENOMEM; |
| |
| *fs = t; |
| return 0; |
| } |
| |
| static int join_path_unified(const char *path, const char *suffix, char **fs) { |
| char *t; |
| |
| assert(fs); |
| |
| if (isempty(path) && isempty(suffix)) |
| t = strdup("/sys/fs/cgroup"); |
| else if (isempty(path)) |
| t = strappend("/sys/fs/cgroup/", suffix); |
| else if (isempty(suffix)) |
| t = strappend("/sys/fs/cgroup/", path); |
| else |
| t = strjoin("/sys/fs/cgroup/", path, "/", suffix, NULL); |
| if (!t) |
| return -ENOMEM; |
| |
| *fs = t; |
| return 0; |
| } |
| |
| int cg_get_path(const char *controller, const char *path, const char *suffix, char **fs) { |
| int unified, r; |
| |
| assert(fs); |
| |
| if (!controller) { |
| char *t; |
| |
| /* If no controller is specified, we return the path |
| * *below* the controllers, without any prefix. */ |
| |
| if (!path && !suffix) |
| return -EINVAL; |
| |
| if (!suffix) |
| t = strdup(path); |
| else if (!path) |
| t = strdup(suffix); |
| else |
| t = strjoin(path, "/", suffix, NULL); |
| if (!t) |
| return -ENOMEM; |
| |
| *fs = path_kill_slashes(t); |
| return 0; |
| } |
| |
| if (!cg_controller_is_valid(controller)) |
| return -EINVAL; |
| |
| unified = cg_unified(); |
| if (unified < 0) |
| return unified; |
| |
| if (unified > 0) |
| r = join_path_unified(path, suffix, fs); |
| else |
| r = join_path_legacy(controller, path, suffix, fs); |
| if (r < 0) |
| return r; |
| |
| path_kill_slashes(*fs); |
| return 0; |
| } |
| |
| static int controller_is_accessible(const char *controller) { |
| int unified; |
| |
| assert(controller); |
| |
| /* Checks whether a specific controller is accessible, |
| * i.e. its hierarchy mounted. In the unified hierarchy all |
| * controllers are considered accessible, except for the named |
| * hierarchies */ |
| |
| if (!cg_controller_is_valid(controller)) |
| return -EINVAL; |
| |
| unified = cg_unified(); |
| if (unified < 0) |
| return unified; |
| if (unified > 0) { |
| /* We don't support named hierarchies if we are using |
| * the unified hierarchy. */ |
| |
| if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) |
| return 0; |
| |
| if (startswith(controller, "name=")) |
| return -EOPNOTSUPP; |
| |
| } else { |
| const char *cc, *dn; |
| |
| dn = controller_to_dirname(controller); |
| cc = strjoina("/sys/fs/cgroup/", dn); |
| |
| if (laccess(cc, F_OK) < 0) |
| return -errno; |
| } |
| |
| return 0; |
| } |
| |
| int cg_get_path_and_check(const char *controller, const char *path, const char *suffix, char **fs) { |
| int r; |
| |
| assert(controller); |
| assert(fs); |
| |
| /* Check if the specified controller is actually accessible */ |
| r = controller_is_accessible(controller); |
| if (r < 0) |
| return r; |
| |
| return cg_get_path(controller, path, suffix, fs); |
| } |
| |
| static int trim_cb(const char *path, const struct stat *sb, int typeflag, struct FTW *ftwbuf) { |
| assert(path); |
| assert(sb); |
| assert(ftwbuf); |
| |
| if (typeflag != FTW_DP) |
| return 0; |
| |
| if (ftwbuf->level < 1) |
| return 0; |
| |
| (void) rmdir(path); |
| return 0; |
| } |
| |
| int cg_trim(const char *controller, const char *path, bool delete_root) { |
| _cleanup_free_ char *fs = NULL; |
| int r = 0; |
| |
| assert(path); |
| |
| r = cg_get_path(controller, path, NULL, &fs); |
| if (r < 0) |
| return r; |
| |
| errno = 0; |
| if (nftw(fs, trim_cb, 64, FTW_DEPTH|FTW_MOUNT|FTW_PHYS) != 0) { |
| if (errno == ENOENT) |
| r = 0; |
| else if (errno > 0) |
| r = -errno; |
| else |
| r = -EIO; |
| } |
| |
| if (delete_root) { |
| if (rmdir(fs) < 0 && errno != ENOENT) |
| return -errno; |
| } |
| |
| return r; |
| } |
| |
| int cg_create(const char *controller, const char *path) { |
| _cleanup_free_ char *fs = NULL; |
| int r; |
| |
| r = cg_get_path_and_check(controller, path, NULL, &fs); |
| if (r < 0) |
| return r; |
| |
| r = mkdir_parents(fs, 0755); |
| if (r < 0) |
| return r; |
| |
| if (mkdir(fs, 0755) < 0) { |
| |
| if (errno == EEXIST) |
| return 0; |
| |
| return -errno; |
| } |
| |
| return 1; |
| } |
| |
| int cg_create_and_attach(const char *controller, const char *path, pid_t pid) { |
| int r, q; |
| |
| assert(pid >= 0); |
| |
| r = cg_create(controller, path); |
| if (r < 0) |
| return r; |
| |
| q = cg_attach(controller, path, pid); |
| if (q < 0) |
| return q; |
| |
| /* This does not remove the cgroup on failure */ |
| return r; |
| } |
| |
| int cg_attach(const char *controller, const char *path, pid_t pid) { |
| _cleanup_free_ char *fs = NULL; |
| char c[DECIMAL_STR_MAX(pid_t) + 2]; |
| int r; |
| |
| assert(path); |
| assert(pid >= 0); |
| |
| r = cg_get_path_and_check(controller, path, "cgroup.procs", &fs); |
| if (r < 0) |
| return r; |
| |
| if (pid == 0) |
| pid = getpid(); |
| |
| xsprintf(c, PID_FMT "\n", pid); |
| |
| return write_string_file(fs, c, 0); |
| } |
| |
| int cg_attach_fallback(const char *controller, const char *path, pid_t pid) { |
| int r; |
| |
| assert(controller); |
| assert(path); |
| assert(pid >= 0); |
| |
| r = cg_attach(controller, path, pid); |
| if (r < 0) { |
| char prefix[strlen(path) + 1]; |
| |
| /* This didn't work? Then let's try all prefixes of |
| * the destination */ |
| |
| PATH_FOREACH_PREFIX(prefix, path) { |
| int q; |
| |
| q = cg_attach(controller, prefix, pid); |
| if (q >= 0) |
| return q; |
| } |
| } |
| |
| return r; |
| } |
| |
| int cg_set_group_access( |
| const char *controller, |
| const char *path, |
| mode_t mode, |
| uid_t uid, |
| gid_t gid) { |
| |
| _cleanup_free_ char *fs = NULL; |
| int r; |
| |
| if (mode == MODE_INVALID && uid == UID_INVALID && gid == GID_INVALID) |
| return 0; |
| |
| if (mode != MODE_INVALID) |
| mode &= 0777; |
| |
| r = cg_get_path(controller, path, NULL, &fs); |
| if (r < 0) |
| return r; |
| |
| return chmod_and_chown(fs, mode, uid, gid); |
| } |
| |
| int cg_set_task_access( |
| const char *controller, |
| const char *path, |
| mode_t mode, |
| uid_t uid, |
| gid_t gid) { |
| |
| _cleanup_free_ char *fs = NULL, *procs = NULL; |
| int r, unified; |
| |
| assert(path); |
| |
| if (mode == MODE_INVALID && uid == UID_INVALID && gid == GID_INVALID) |
| return 0; |
| |
| if (mode != MODE_INVALID) |
| mode &= 0666; |
| |
| r = cg_get_path(controller, path, "cgroup.procs", &fs); |
| if (r < 0) |
| return r; |
| |
| r = chmod_and_chown(fs, mode, uid, gid); |
| if (r < 0) |
| return r; |
| |
| unified = cg_unified(); |
| if (unified < 0) |
| return unified; |
| if (unified) |
| return 0; |
| |
| /* Compatibility, Always keep values for "tasks" in sync with |
| * "cgroup.procs" */ |
| if (cg_get_path(controller, path, "tasks", &procs) >= 0) |
| (void) chmod_and_chown(procs, mode, uid, gid); |
| |
| return 0; |
| } |
| |
| int cg_pid_get_path(const char *controller, pid_t pid, char **path) { |
| _cleanup_fclose_ FILE *f = NULL; |
| char line[LINE_MAX]; |
| const char *fs; |
| size_t cs = 0; |
| int unified; |
| |
| assert(path); |
| assert(pid >= 0); |
| |
| unified = cg_unified(); |
| if (unified < 0) |
| return unified; |
| if (unified == 0) { |
| if (controller) { |
| if (!cg_controller_is_valid(controller)) |
| return -EINVAL; |
| } else |
| controller = SYSTEMD_CGROUP_CONTROLLER; |
| |
| cs = strlen(controller); |
| } |
| |
| fs = procfs_file_alloca(pid, "cgroup"); |
| f = fopen(fs, "re"); |
| if (!f) |
| return errno == ENOENT ? -ESRCH : -errno; |
| |
| FOREACH_LINE(line, f, return -errno) { |
| char *e, *p; |
| |
| truncate_nl(line); |
| |
| if (unified) { |
| e = startswith(line, "0:"); |
| if (!e) |
| continue; |
| |
| e = strchr(e, ':'); |
| if (!e) |
| continue; |
| } else { |
| char *l; |
| size_t k; |
| const char *word, *state; |
| bool found = false; |
| |
| l = strchr(line, ':'); |
| if (!l) |
| continue; |
| |
| l++; |
| e = strchr(l, ':'); |
| if (!e) |
| continue; |
| |
| *e = 0; |
| FOREACH_WORD_SEPARATOR(word, k, l, ",", state) { |
| if (k == cs && memcmp(word, controller, cs) == 0) { |
| found = true; |
| break; |
| } |
| } |
| |
| if (!found) |
| continue; |
| } |
| |
| p = strdup(e + 1); |
| if (!p) |
| return -ENOMEM; |
| |
| *path = p; |
| return 0; |
| } |
| |
| return -ENODATA; |
| } |
| |
| int cg_install_release_agent(const char *controller, const char *agent) { |
| _cleanup_free_ char *fs = NULL, *contents = NULL; |
| const char *sc; |
| int r, unified; |
| |
| assert(agent); |
| |
| unified = cg_unified(); |
| if (unified < 0) |
| return unified; |
| if (unified) /* doesn't apply to unified hierarchy */ |
| return -EOPNOTSUPP; |
| |
| r = cg_get_path(controller, NULL, "release_agent", &fs); |
| if (r < 0) |
| return r; |
| |
| r = read_one_line_file(fs, &contents); |
| if (r < 0) |
| return r; |
| |
| sc = strstrip(contents); |
| if (isempty(sc)) { |
| r = write_string_file(fs, agent, 0); |
| if (r < 0) |
| return r; |
| } else if (!path_equal(sc, agent)) |
| return -EEXIST; |
| |
| fs = mfree(fs); |
| r = cg_get_path(controller, NULL, "notify_on_release", &fs); |
| if (r < 0) |
| return r; |
| |
| contents = mfree(contents); |
| r = read_one_line_file(fs, &contents); |
| if (r < 0) |
| return r; |
| |
| sc = strstrip(contents); |
| if (streq(sc, "0")) { |
| r = write_string_file(fs, "1", 0); |
| if (r < 0) |
| return r; |
| |
| return 1; |
| } |
| |
| if (!streq(sc, "1")) |
| return -EIO; |
| |
| return 0; |
| } |
| |
| int cg_uninstall_release_agent(const char *controller) { |
| _cleanup_free_ char *fs = NULL; |
| int r, unified; |
| |
| unified = cg_unified(); |
| if (unified < 0) |
| return unified; |
| if (unified) /* Doesn't apply to unified hierarchy */ |
| return -EOPNOTSUPP; |
| |
| r = cg_get_path(controller, NULL, "notify_on_release", &fs); |
| if (r < 0) |
| return r; |
| |
| r = write_string_file(fs, "0", 0); |
| if (r < 0) |
| return r; |
| |
| fs = mfree(fs); |
| |
| r = cg_get_path(controller, NULL, "release_agent", &fs); |
| if (r < 0) |
| return r; |
| |
| r = write_string_file(fs, "", 0); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| int cg_is_empty(const char *controller, const char *path) { |
| _cleanup_fclose_ FILE *f = NULL; |
| pid_t pid; |
| int r; |
| |
| assert(path); |
| |
| r = cg_enumerate_processes(controller, path, &f); |
| if (r == -ENOENT) |
| return 1; |
| if (r < 0) |
| return r; |
| |
| r = cg_read_pid(f, &pid); |
| if (r < 0) |
| return r; |
| |
| return r == 0; |
| } |
| |
| int cg_is_empty_recursive(const char *controller, const char *path) { |
| int unified, r; |
| |
| assert(path); |
| |
| /* The root cgroup is always populated */ |
| if (controller && (isempty(path) || path_equal(path, "/"))) |
| return false; |
| |
| unified = cg_unified(); |
| if (unified < 0) |
| return unified; |
| |
| if (unified > 0) { |
| _cleanup_free_ char *t = NULL; |
| |
| /* On the unified hierarchy we can check empty state |
| * via the "populated" attribute of "cgroup.events". */ |
| |
| r = cg_read_event(controller, path, "populated", &t); |
| if (r < 0) |
| return r; |
| |
| return streq(t, "0"); |
| } else { |
| _cleanup_closedir_ DIR *d = NULL; |
| char *fn; |
| |
| r = cg_is_empty(controller, path); |
| if (r <= 0) |
| return r; |
| |
| r = cg_enumerate_subgroups(controller, path, &d); |
| if (r == -ENOENT) |
| return 1; |
| if (r < 0) |
| return r; |
| |
| while ((r = cg_read_subgroup(d, &fn)) > 0) { |
| _cleanup_free_ char *p = NULL; |
| |
| p = strjoin(path, "/", fn, NULL); |
| free(fn); |
| if (!p) |
| return -ENOMEM; |
| |
| r = cg_is_empty_recursive(controller, p); |
| if (r <= 0) |
| return r; |
| } |
| if (r < 0) |
| return r; |
| |
| return true; |
| } |
| } |
| |
| int cg_split_spec(const char *spec, char **controller, char **path) { |
| char *t = NULL, *u = NULL; |
| const char *e; |
| |
| assert(spec); |
| |
| if (*spec == '/') { |
| if (!path_is_safe(spec)) |
| return -EINVAL; |
| |
| if (path) { |
| t = strdup(spec); |
| if (!t) |
| return -ENOMEM; |
| |
| *path = path_kill_slashes(t); |
| } |
| |
| if (controller) |
| *controller = NULL; |
| |
| return 0; |
| } |
| |
| e = strchr(spec, ':'); |
| if (!e) { |
| if (!cg_controller_is_valid(spec)) |
| return -EINVAL; |
| |
| if (controller) { |
| t = strdup(spec); |
| if (!t) |
| return -ENOMEM; |
| |
| *controller = t; |
| } |
| |
| if (path) |
| *path = NULL; |
| |
| return 0; |
| } |
| |
| t = strndup(spec, e-spec); |
| if (!t) |
| return -ENOMEM; |
| if (!cg_controller_is_valid(t)) { |
| free(t); |
| return -EINVAL; |
| } |
| |
| if (isempty(e+1)) |
| u = NULL; |
| else { |
| u = strdup(e+1); |
| if (!u) { |
| free(t); |
| return -ENOMEM; |
| } |
| |
| if (!path_is_safe(u) || |
| !path_is_absolute(u)) { |
| free(t); |
| free(u); |
| return -EINVAL; |
| } |
| |
| path_kill_slashes(u); |
| } |
| |
| if (controller) |
| *controller = t; |
| else |
| free(t); |
| |
| if (path) |
| *path = u; |
| else |
| free(u); |
| |
| return 0; |
| } |
| |
| int cg_mangle_path(const char *path, char **result) { |
| _cleanup_free_ char *c = NULL, *p = NULL; |
| char *t; |
| int r; |
| |
| assert(path); |
| assert(result); |
| |
| /* First, check if it already is a filesystem path */ |
| if (path_startswith(path, "/sys/fs/cgroup")) { |
| |
| t = strdup(path); |
| if (!t) |
| return -ENOMEM; |
| |
| *result = path_kill_slashes(t); |
| return 0; |
| } |
| |
| /* Otherwise, treat it as cg spec */ |
| r = cg_split_spec(path, &c, &p); |
| if (r < 0) |
| return r; |
| |
| return cg_get_path(c ?: SYSTEMD_CGROUP_CONTROLLER, p ?: "/", NULL, result); |
| } |
| |
| int cg_get_root_path(char **path) { |
| char *p, *e; |
| int r; |
| |
| assert(path); |
| |
| r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 1, &p); |
| if (r < 0) |
| return r; |
| |
| e = endswith(p, "/" SPECIAL_INIT_SCOPE); |
| if (!e) |
| e = endswith(p, "/" SPECIAL_SYSTEM_SLICE); /* legacy */ |
| if (!e) |
| e = endswith(p, "/system"); /* even more legacy */ |
| if (e) |
| *e = 0; |
| |
| *path = p; |
| return 0; |
| } |
| |
| int cg_shift_path(const char *cgroup, const char *root, const char **shifted) { |
| _cleanup_free_ char *rt = NULL; |
| char *p; |
| int r; |
| |
| assert(cgroup); |
| assert(shifted); |
| |
| if (!root) { |
| /* If the root was specified let's use that, otherwise |
| * let's determine it from PID 1 */ |
| |
| r = cg_get_root_path(&rt); |
| if (r < 0) |
| return r; |
| |
| root = rt; |
| } |
| |
| p = path_startswith(cgroup, root); |
| if (p && p > cgroup) |
| *shifted = p - 1; |
| else |
| *shifted = cgroup; |
| |
| return 0; |
| } |
| |
| int cg_pid_get_path_shifted(pid_t pid, const char *root, char **cgroup) { |
| _cleanup_free_ char *raw = NULL; |
| const char *c; |
| int r; |
| |
| assert(pid >= 0); |
| assert(cgroup); |
| |
| r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &raw); |
| if (r < 0) |
| return r; |
| |
| r = cg_shift_path(raw, root, &c); |
| if (r < 0) |
| return r; |
| |
| if (c == raw) { |
| *cgroup = raw; |
| raw = NULL; |
| } else { |
| char *n; |
| |
| n = strdup(c); |
| if (!n) |
| return -ENOMEM; |
| |
| *cgroup = n; |
| } |
| |
| return 0; |
| } |
| |
| int cg_path_decode_unit(const char *cgroup, char **unit) { |
| char *c, *s; |
| size_t n; |
| |
| assert(cgroup); |
| assert(unit); |
| |
| n = strcspn(cgroup, "/"); |
| if (n < 3) |
| return -ENXIO; |
| |
| c = strndupa(cgroup, n); |
| c = cg_unescape(c); |
| |
| if (!unit_name_is_valid(c, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE)) |
| return -ENXIO; |
| |
| s = strdup(c); |
| if (!s) |
| return -ENOMEM; |
| |
| *unit = s; |
| return 0; |
| } |
| |
| static bool valid_slice_name(const char *p, size_t n) { |
| |
| if (!p) |
| return false; |
| |
| if (n < strlen("x.slice")) |
| return false; |
| |
| if (memcmp(p + n - 6, ".slice", 6) == 0) { |
| char buf[n+1], *c; |
| |
| memcpy(buf, p, n); |
| buf[n] = 0; |
| |
| c = cg_unescape(buf); |
| |
| return unit_name_is_valid(c, UNIT_NAME_PLAIN); |
| } |
| |
| return false; |
| } |
| |
| static const char *skip_slices(const char *p) { |
| assert(p); |
| |
| /* Skips over all slice assignments */ |
| |
| for (;;) { |
| size_t n; |
| |
| p += strspn(p, "/"); |
| |
| n = strcspn(p, "/"); |
| if (!valid_slice_name(p, n)) |
| return p; |
| |
| p += n; |
| } |
| } |
| |
| int cg_path_get_unit(const char *path, char **ret) { |
| const char *e; |
| char *unit; |
| int r; |
| |
| assert(path); |
| assert(ret); |
| |
| e = skip_slices(path); |
| |
| r = cg_path_decode_unit(e, &unit); |
| if (r < 0) |
| return r; |
| |
| /* We skipped over the slices, don't accept any now */ |
| if (endswith(unit, ".slice")) { |
| free(unit); |
| return -ENXIO; |
| } |
| |
| *ret = unit; |
| return 0; |
| } |
| |
| int cg_pid_get_unit(pid_t pid, char **unit) { |
| _cleanup_free_ char *cgroup = NULL; |
| int r; |
| |
| assert(unit); |
| |
| r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
| if (r < 0) |
| return r; |
| |
| return cg_path_get_unit(cgroup, unit); |
| } |
| |
| /** |
| * Skip session-*.scope, but require it to be there. |
| */ |
| static const char *skip_session(const char *p) { |
| size_t n; |
| |
| if (isempty(p)) |
| return NULL; |
| |
| p += strspn(p, "/"); |
| |
| n = strcspn(p, "/"); |
| if (n < strlen("session-x.scope")) |
| return NULL; |
| |
| if (memcmp(p, "session-", 8) == 0 && memcmp(p + n - 6, ".scope", 6) == 0) { |
| char buf[n - 8 - 6 + 1]; |
| |
| memcpy(buf, p + 8, n - 8 - 6); |
| buf[n - 8 - 6] = 0; |
| |
| /* Note that session scopes never need unescaping, |
| * since they cannot conflict with the kernel's own |
| * names, hence we don't need to call cg_unescape() |
| * here. */ |
| |
| if (!session_id_valid(buf)) |
| return false; |
| |
| p += n; |
| p += strspn(p, "/"); |
| return p; |
| } |
| |
| return NULL; |
| } |
| |
| /** |
| * Skip user@*.service, but require it to be there. |
| */ |
| static const char *skip_user_manager(const char *p) { |
| size_t n; |
| |
| if (isempty(p)) |
| return NULL; |
| |
| p += strspn(p, "/"); |
| |
| n = strcspn(p, "/"); |
| if (n < strlen("user@x.service")) |
| return NULL; |
| |
| if (memcmp(p, "user@", 5) == 0 && memcmp(p + n - 8, ".service", 8) == 0) { |
| char buf[n - 5 - 8 + 1]; |
| |
| memcpy(buf, p + 5, n - 5 - 8); |
| buf[n - 5 - 8] = 0; |
| |
| /* Note that user manager services never need unescaping, |
| * since they cannot conflict with the kernel's own |
| * names, hence we don't need to call cg_unescape() |
| * here. */ |
| |
| if (parse_uid(buf, NULL) < 0) |
| return NULL; |
| |
| p += n; |
| p += strspn(p, "/"); |
| |
| return p; |
| } |
| |
| return NULL; |
| } |
| |
| static const char *skip_user_prefix(const char *path) { |
| const char *e, *t; |
| |
| assert(path); |
| |
| /* Skip slices, if there are any */ |
| e = skip_slices(path); |
| |
| /* Skip the user manager, if it's in the path now... */ |
| t = skip_user_manager(e); |
| if (t) |
| return t; |
| |
| /* Alternatively skip the user session if it is in the path... */ |
| return skip_session(e); |
| } |
| |
| int cg_path_get_user_unit(const char *path, char **ret) { |
| const char *t; |
| |
| assert(path); |
| assert(ret); |
| |
| t = skip_user_prefix(path); |
| if (!t) |
| return -ENXIO; |
| |
| /* And from here on it looks pretty much the same as for a |
| * system unit, hence let's use the same parser from here |
| * on. */ |
| return cg_path_get_unit(t, ret); |
| } |
| |
| int cg_pid_get_user_unit(pid_t pid, char **unit) { |
| _cleanup_free_ char *cgroup = NULL; |
| int r; |
| |
| assert(unit); |
| |
| r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
| if (r < 0) |
| return r; |
| |
| return cg_path_get_user_unit(cgroup, unit); |
| } |
| |
| int cg_path_get_machine_name(const char *path, char **machine) { |
| _cleanup_free_ char *u = NULL; |
| const char *sl; |
| int r; |
| |
| r = cg_path_get_unit(path, &u); |
| if (r < 0) |
| return r; |
| |
| sl = strjoina("/run/systemd/machines/unit:", u); |
| return readlink_malloc(sl, machine); |
| } |
| |
| int cg_pid_get_machine_name(pid_t pid, char **machine) { |
| _cleanup_free_ char *cgroup = NULL; |
| int r; |
| |
| assert(machine); |
| |
| r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
| if (r < 0) |
| return r; |
| |
| return cg_path_get_machine_name(cgroup, machine); |
| } |
| |
| int cg_path_get_session(const char *path, char **session) { |
| _cleanup_free_ char *unit = NULL; |
| char *start, *end; |
| int r; |
| |
| assert(path); |
| |
| r = cg_path_get_unit(path, &unit); |
| if (r < 0) |
| return r; |
| |
| start = startswith(unit, "session-"); |
| if (!start) |
| return -ENXIO; |
| end = endswith(start, ".scope"); |
| if (!end) |
| return -ENXIO; |
| |
| *end = 0; |
| if (!session_id_valid(start)) |
| return -ENXIO; |
| |
| if (session) { |
| char *rr; |
| |
| rr = strdup(start); |
| if (!rr) |
| return -ENOMEM; |
| |
| *session = rr; |
| } |
| |
| return 0; |
| } |
| |
| int cg_pid_get_session(pid_t pid, char **session) { |
| _cleanup_free_ char *cgroup = NULL; |
| int r; |
| |
| r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
| if (r < 0) |
| return r; |
| |
| return cg_path_get_session(cgroup, session); |
| } |
| |
| int cg_path_get_owner_uid(const char *path, uid_t *uid) { |
| _cleanup_free_ char *slice = NULL; |
| char *start, *end; |
| int r; |
| |
| assert(path); |
| |
| r = cg_path_get_slice(path, &slice); |
| if (r < 0) |
| return r; |
| |
| start = startswith(slice, "user-"); |
| if (!start) |
| return -ENXIO; |
| end = endswith(start, ".slice"); |
| if (!end) |
| return -ENXIO; |
| |
| *end = 0; |
| if (parse_uid(start, uid) < 0) |
| return -ENXIO; |
| |
| return 0; |
| } |
| |
| int cg_pid_get_owner_uid(pid_t pid, uid_t *uid) { |
| _cleanup_free_ char *cgroup = NULL; |
| int r; |
| |
| r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
| if (r < 0) |
| return r; |
| |
| return cg_path_get_owner_uid(cgroup, uid); |
| } |
| |
| int cg_path_get_slice(const char *p, char **slice) { |
| const char *e = NULL; |
| |
| assert(p); |
| assert(slice); |
| |
| /* Finds the right-most slice unit from the beginning, but |
| * stops before we come to the first non-slice unit. */ |
| |
| for (;;) { |
| size_t n; |
| |
| p += strspn(p, "/"); |
| |
| n = strcspn(p, "/"); |
| if (!valid_slice_name(p, n)) { |
| |
| if (!e) { |
| char *s; |
| |
| s = strdup("-.slice"); |
| if (!s) |
| return -ENOMEM; |
| |
| *slice = s; |
| return 0; |
| } |
| |
| return cg_path_decode_unit(e, slice); |
| } |
| |
| e = p; |
| p += n; |
| } |
| } |
| |
| int cg_pid_get_slice(pid_t pid, char **slice) { |
| _cleanup_free_ char *cgroup = NULL; |
| int r; |
| |
| assert(slice); |
| |
| r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
| if (r < 0) |
| return r; |
| |
| return cg_path_get_slice(cgroup, slice); |
| } |
| |
| int cg_path_get_user_slice(const char *p, char **slice) { |
| const char *t; |
| assert(p); |
| assert(slice); |
| |
| t = skip_user_prefix(p); |
| if (!t) |
| return -ENXIO; |
| |
| /* And now it looks pretty much the same as for a system |
| * slice, so let's just use the same parser from here on. */ |
| return cg_path_get_slice(t, slice); |
| } |
| |
| int cg_pid_get_user_slice(pid_t pid, char **slice) { |
| _cleanup_free_ char *cgroup = NULL; |
| int r; |
| |
| assert(slice); |
| |
| r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
| if (r < 0) |
| return r; |
| |
| return cg_path_get_user_slice(cgroup, slice); |
| } |
| |
| char *cg_escape(const char *p) { |
| bool need_prefix = false; |
| |
| /* This implements very minimal escaping for names to be used |
| * as file names in the cgroup tree: any name which might |
| * conflict with a kernel name or is prefixed with '_' is |
| * prefixed with a '_'. That way, when reading cgroup names it |
| * is sufficient to remove a single prefixing underscore if |
| * there is one. */ |
| |
| /* The return value of this function (unlike cg_unescape()) |
| * needs free()! */ |
| |
| if (p[0] == 0 || |
| p[0] == '_' || |
| p[0] == '.' || |
| streq(p, "notify_on_release") || |
| streq(p, "release_agent") || |
| streq(p, "tasks") || |
| startswith(p, "cgroup.")) |
| need_prefix = true; |
| else { |
| const char *dot; |
| |
| dot = strrchr(p, '.'); |
| if (dot) { |
| CGroupController c; |
| size_t l = dot - p; |
| |
| for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { |
| const char *n; |
| |
| n = cgroup_controller_to_string(c); |
| |
| if (l != strlen(n)) |
| continue; |
| |
| if (memcmp(p, n, l) != 0) |
| continue; |
| |
| need_prefix = true; |
| break; |
| } |
| } |
| } |
| |
| if (need_prefix) |
| return strappend("_", p); |
| |
| return strdup(p); |
| } |
| |
| char *cg_unescape(const char *p) { |
| assert(p); |
| |
| /* The return value of this function (unlike cg_escape()) |
| * doesn't need free()! */ |
| |
| if (p[0] == '_') |
| return (char*) p+1; |
| |
| return (char*) p; |
| } |
| |
| #define CONTROLLER_VALID \ |
| DIGITS LETTERS \ |
| "_" |
| |
| bool cg_controller_is_valid(const char *p) { |
| const char *t, *s; |
| |
| if (!p) |
| return false; |
| |
| s = startswith(p, "name="); |
| if (s) |
| p = s; |
| |
| if (*p == 0 || *p == '_') |
| return false; |
| |
| for (t = p; *t; t++) |
| if (!strchr(CONTROLLER_VALID, *t)) |
| return false; |
| |
| if (t - p > FILENAME_MAX) |
| return false; |
| |
| return true; |
| } |
| |
| int cg_slice_to_path(const char *unit, char **ret) { |
| _cleanup_free_ char *p = NULL, *s = NULL, *e = NULL; |
| const char *dash; |
| int r; |
| |
| assert(unit); |
| assert(ret); |
| |
| if (streq(unit, "-.slice")) { |
| char *x; |
| |
| x = strdup(""); |
| if (!x) |
| return -ENOMEM; |
| *ret = x; |
| return 0; |
| } |
| |
| if (!unit_name_is_valid(unit, UNIT_NAME_PLAIN)) |
| return -EINVAL; |
| |
| if (!endswith(unit, ".slice")) |
| return -EINVAL; |
| |
| r = unit_name_to_prefix(unit, &p); |
| if (r < 0) |
| return r; |
| |
| dash = strchr(p, '-'); |
| |
| /* Don't allow initial dashes */ |
| if (dash == p) |
| return -EINVAL; |
| |
| while (dash) { |
| _cleanup_free_ char *escaped = NULL; |
| char n[dash - p + sizeof(".slice")]; |
| |
| /* Don't allow trailing or double dashes */ |
| if (dash[1] == 0 || dash[1] == '-') |
| return -EINVAL; |
| |
| strcpy(stpncpy(n, p, dash - p), ".slice"); |
| if (!unit_name_is_valid(n, UNIT_NAME_PLAIN)) |
| return -EINVAL; |
| |
| escaped = cg_escape(n); |
| if (!escaped) |
| return -ENOMEM; |
| |
| if (!strextend(&s, escaped, "/", NULL)) |
| return -ENOMEM; |
| |
| dash = strchr(dash+1, '-'); |
| } |
| |
| e = cg_escape(unit); |
| if (!e) |
| return -ENOMEM; |
| |
| if (!strextend(&s, e, NULL)) |
| return -ENOMEM; |
| |
| *ret = s; |
| s = NULL; |
| |
| return 0; |
| } |
| |
| int cg_set_attribute(const char *controller, const char *path, const char *attribute, const char *value) { |
| _cleanup_free_ char *p = NULL; |
| int r; |
| |
| r = cg_get_path(controller, path, attribute, &p); |
| if (r < 0) |
| return r; |
| |
| return write_string_file(p, value, 0); |
| } |
| |
| int cg_get_attribute(const char *controller, const char *path, const char *attribute, char **ret) { |
| _cleanup_free_ char *p = NULL; |
| int r; |
| |
| r = cg_get_path(controller, path, attribute, &p); |
| if (r < 0) |
| return r; |
| |
| return read_one_line_file(p, ret); |
| } |
| |
| int cg_create_everywhere(CGroupMask supported, CGroupMask mask, const char *path) { |
| CGroupController c; |
| int r, unified; |
| |
| /* This one will create a cgroup in our private tree, but also |
| * duplicate it in the trees specified in mask, and remove it |
| * in all others */ |
| |
| /* First create the cgroup in our own hierarchy. */ |
| r = cg_create(SYSTEMD_CGROUP_CONTROLLER, path); |
| if (r < 0) |
| return r; |
| |
| /* If we are in the unified hierarchy, we are done now */ |
| unified = cg_unified(); |
| if (unified < 0) |
| return unified; |
| if (unified > 0) |
| return 0; |
| |
| /* Otherwise, do the same in the other hierarchies */ |
| for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { |
| CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c); |
| const char *n; |
| |
| n = cgroup_controller_to_string(c); |
| |
| if (mask & bit) |
| (void) cg_create(n, path); |
| else if (supported & bit) |
| (void) cg_trim(n, path, true); |
| } |
| |
| return 0; |
| } |
| |
| int cg_attach_everywhere(CGroupMask supported, const char *path, pid_t pid, cg_migrate_callback_t path_callback, void *userdata) { |
| CGroupController c; |
| int r, unified; |
| |
| r = cg_attach(SYSTEMD_CGROUP_CONTROLLER, path, pid); |
| if (r < 0) |
| return r; |
| |
| unified = cg_unified(); |
| if (unified < 0) |
| return unified; |
| if (unified > 0) |
| return 0; |
| |
| for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { |
| CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c); |
| const char *p = NULL; |
| |
| if (!(supported & bit)) |
| continue; |
| |
| if (path_callback) |
| p = path_callback(bit, userdata); |
| |
| if (!p) |
| p = path; |
| |
| (void) cg_attach_fallback(cgroup_controller_to_string(c), p, pid); |
| } |
| |
| return 0; |
| } |
| |
| int cg_attach_many_everywhere(CGroupMask supported, const char *path, Set* pids, cg_migrate_callback_t path_callback, void *userdata) { |
| Iterator i; |
| void *pidp; |
| int r = 0; |
| |
| SET_FOREACH(pidp, pids, i) { |
| pid_t pid = PTR_TO_PID(pidp); |
| int q; |
| |
| q = cg_attach_everywhere(supported, path, pid, path_callback, userdata); |
| if (q < 0 && r >= 0) |
| r = q; |
| } |
| |
| return r; |
| } |
| |
| int cg_migrate_everywhere(CGroupMask supported, const char *from, const char *to, cg_migrate_callback_t to_callback, void *userdata) { |
| CGroupController c; |
| int r = 0, unified; |
| |
| if (!path_equal(from, to)) { |
| r = cg_migrate_recursive(SYSTEMD_CGROUP_CONTROLLER, from, SYSTEMD_CGROUP_CONTROLLER, to, false, true); |
| if (r < 0) |
| return r; |
| } |
| |
| unified = cg_unified(); |
| if (unified < 0) |
| return unified; |
| if (unified > 0) |
| return r; |
| |
| for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { |
| CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c); |
| const char *p = NULL; |
| |
| if (!(supported & bit)) |
| continue; |
| |
| if (to_callback) |
| p = to_callback(bit, userdata); |
| |
| if (!p) |
| p = to; |
| |
| (void) cg_migrate_recursive_fallback(SYSTEMD_CGROUP_CONTROLLER, to, cgroup_controller_to_string(c), p, false, false); |
| } |
| |
| return 0; |
| } |
| |
| int cg_trim_everywhere(CGroupMask supported, const char *path, bool delete_root) { |
| CGroupController c; |
| int r, unified; |
| |
| r = cg_trim(SYSTEMD_CGROUP_CONTROLLER, path, delete_root); |
| if (r < 0) |
| return r; |
| |
| unified = cg_unified(); |
| if (unified < 0) |
| return unified; |
| if (unified > 0) |
| return r; |
| |
| for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { |
| CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c); |
| |
| if (!(supported & bit)) |
| continue; |
| |
| (void) cg_trim(cgroup_controller_to_string(c), path, delete_root); |
| } |
| |
| return 0; |
| } |
| |
| int cg_mask_supported(CGroupMask *ret) { |
| CGroupMask mask = 0; |
| int r, unified; |
| |
| /* Determines the mask of supported cgroup controllers. Only |
| * includes controllers we can make sense of and that are |
| * actually accessible. */ |
| |
| unified = cg_unified(); |
| if (unified < 0) |
| return unified; |
| if (unified > 0) { |
| _cleanup_free_ char *root = NULL, *controllers = NULL, *path = NULL; |
| const char *c; |
| |
| /* In the unified hierarchy we can read the supported |
| * and accessible controllers from a the top-level |
| * cgroup attribute */ |
| |
| r = cg_get_root_path(&root); |
| if (r < 0) |
| return r; |
| |
| r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, root, "cgroup.controllers", &path); |
| if (r < 0) |
| return r; |
| |
| r = read_one_line_file(path, &controllers); |
| if (r < 0) |
| return r; |
| |
| c = controllers; |
| for (;;) { |
| _cleanup_free_ char *n = NULL; |
| CGroupController v; |
| |
| r = extract_first_word(&c, &n, NULL, 0); |
| if (r < 0) |
| return r; |
| if (r == 0) |
| break; |
| |
| v = cgroup_controller_from_string(n); |
| if (v < 0) |
| continue; |
| |
| mask |= CGROUP_CONTROLLER_TO_MASK(v); |
| } |
| |
| /* Currently, we only support the memory, io and pids |
| * controller in the unified hierarchy, mask |
| * everything else off. */ |
| mask &= CGROUP_MASK_MEMORY | CGROUP_MASK_IO | CGROUP_MASK_PIDS; |
| |
| } else { |
| CGroupController c; |
| |
| /* In the legacy hierarchy, we check whether which |
| * hierarchies are mounted. */ |
| |
| for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { |
| const char *n; |
| |
| n = cgroup_controller_to_string(c); |
| if (controller_is_accessible(n) >= 0) |
| mask |= CGROUP_CONTROLLER_TO_MASK(c); |
| } |
| } |
| |
| *ret = mask; |
| return 0; |
| } |
| |
| int cg_kernel_controllers(Set *controllers) { |
| _cleanup_fclose_ FILE *f = NULL; |
| char buf[LINE_MAX]; |
| int r; |
| |
| assert(controllers); |
| |
| /* Determines the full list of kernel-known controllers. Might |
| * include controllers we don't actually support, arbitrary |
| * named hierarchies and controllers that aren't currently |
| * accessible (because not mounted). */ |
| |
| f = fopen("/proc/cgroups", "re"); |
| if (!f) { |
| if (errno == ENOENT) |
| return 0; |
| return -errno; |
| } |
| |
| /* Ignore the header line */ |
| (void) fgets(buf, sizeof(buf), f); |
| |
| for (;;) { |
| char *controller; |
| int enabled = 0; |
| |
| errno = 0; |
| if (fscanf(f, "%ms %*i %*i %i", &controller, &enabled) != 2) { |
| |
| if (feof(f)) |
| break; |
| |
| if (ferror(f) && errno > 0) |
| return -errno; |
| |
| return -EBADMSG; |
| } |
| |
| if (!enabled) { |
| free(controller); |
| continue; |
| } |
| |
| if (!cg_controller_is_valid(controller)) { |
| free(controller); |
| return -EBADMSG; |
| } |
| |
| r = set_consume(controllers, controller); |
| if (r < 0) |
| return r; |
| } |
| |
| return 0; |
| } |
| |
| static thread_local int unified_cache = -1; |
| |
| int cg_unified(void) { |
| struct statfs fs; |
| |
| /* Checks if we support the unified hierarchy. Returns an |
| * error when the cgroup hierarchies aren't mounted yet or we |
| * have any other trouble determining if the unified hierarchy |
| * is supported. */ |
| |
| if (unified_cache >= 0) |
| return unified_cache; |
| |
| if (statfs("/sys/fs/cgroup/", &fs) < 0) |
| return -errno; |
| |
| if (F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC)) |
| unified_cache = true; |
| else if (F_TYPE_EQUAL(fs.f_type, TMPFS_MAGIC)) |
| unified_cache = false; |
| else |
| return -ENOMEDIUM; |
| |
| return unified_cache; |
| } |
| |
| void cg_unified_flush(void) { |
| unified_cache = -1; |
| } |
| |
| int cg_enable_everywhere(CGroupMask supported, CGroupMask mask, const char *p) { |
| _cleanup_free_ char *fs = NULL; |
| CGroupController c; |
| int r, unified; |
| |
| assert(p); |
| |
| if (supported == 0) |
| return 0; |
| |
| unified = cg_unified(); |
| if (unified < 0) |
| return unified; |
| if (!unified) /* on the legacy hiearchy there's no joining of controllers defined */ |
| return 0; |
| |
| r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, p, "cgroup.subtree_control", &fs); |
| if (r < 0) |
| return r; |
| |
| for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { |
| CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c); |
| const char *n; |
| |
| if (!(supported & bit)) |
| continue; |
| |
| n = cgroup_controller_to_string(c); |
| { |
| char s[1 + strlen(n) + 1]; |
| |
| s[0] = mask & bit ? '+' : '-'; |
| strcpy(s + 1, n); |
| |
| r = write_string_file(fs, s, 0); |
| if (r < 0) |
| log_debug_errno(r, "Failed to enable controller %s for %s (%s): %m", n, p, fs); |
| } |
| } |
| |
| return 0; |
| } |
| |
| bool cg_is_unified_wanted(void) { |
| static thread_local int wanted = -1; |
| int r, unified; |
| |
| /* If the hierarchy is already mounted, then follow whatever |
| * was chosen for it. */ |
| unified = cg_unified(); |
| if (unified >= 0) |
| return unified; |
| |
| /* Otherwise, let's see what the kernel command line has to |
| * say. Since checking that is expensive, let's cache the |
| * result. */ |
| if (wanted >= 0) |
| return wanted; |
| |
| r = get_proc_cmdline_key("systemd.unified_cgroup_hierarchy", NULL); |
| if (r > 0) |
| return (wanted = true); |
| else { |
| _cleanup_free_ char *value = NULL; |
| |
| r = get_proc_cmdline_key("systemd.unified_cgroup_hierarchy=", &value); |
| if (r < 0) |
| return false; |
| if (r == 0) |
| return (wanted = false); |
| |
| return (wanted = parse_boolean(value) > 0); |
| } |
| } |
| |
| bool cg_is_legacy_wanted(void) { |
| return !cg_is_unified_wanted(); |
| } |
| |
| int cg_weight_parse(const char *s, uint64_t *ret) { |
| uint64_t u; |
| int r; |
| |
| if (isempty(s)) { |
| *ret = CGROUP_WEIGHT_INVALID; |
| return 0; |
| } |
| |
| r = safe_atou64(s, &u); |
| if (r < 0) |
| return r; |
| |
| if (u < CGROUP_WEIGHT_MIN || u > CGROUP_WEIGHT_MAX) |
| return -ERANGE; |
| |
| *ret = u; |
| return 0; |
| } |
| |
| const uint64_t cgroup_io_limit_defaults[_CGROUP_IO_LIMIT_TYPE_MAX] = { |
| [CGROUP_IO_RBPS_MAX] = CGROUP_LIMIT_MAX, |
| [CGROUP_IO_WBPS_MAX] = CGROUP_LIMIT_MAX, |
| [CGROUP_IO_RIOPS_MAX] = CGROUP_LIMIT_MAX, |
| [CGROUP_IO_WIOPS_MAX] = CGROUP_LIMIT_MAX, |
| }; |
| |
| static const char* const cgroup_io_limit_type_table[_CGROUP_IO_LIMIT_TYPE_MAX] = { |
| [CGROUP_IO_RBPS_MAX] = "IOReadBandwidthMax", |
| [CGROUP_IO_WBPS_MAX] = "IOWriteBandwidthMax", |
| [CGROUP_IO_RIOPS_MAX] = "IOReadIOPSMax", |
| [CGROUP_IO_WIOPS_MAX] = "IOWriteIOPSMax", |
| }; |
| |
| DEFINE_STRING_TABLE_LOOKUP(cgroup_io_limit_type, CGroupIOLimitType); |
| |
| int cg_cpu_shares_parse(const char *s, uint64_t *ret) { |
| uint64_t u; |
| int r; |
| |
| if (isempty(s)) { |
| *ret = CGROUP_CPU_SHARES_INVALID; |
| return 0; |
| } |
| |
| r = safe_atou64(s, &u); |
| if (r < 0) |
| return r; |
| |
| if (u < CGROUP_CPU_SHARES_MIN || u > CGROUP_CPU_SHARES_MAX) |
| return -ERANGE; |
| |
| *ret = u; |
| return 0; |
| } |
| |
| int cg_blkio_weight_parse(const char *s, uint64_t *ret) { |
| uint64_t u; |
| int r; |
| |
| if (isempty(s)) { |
| *ret = CGROUP_BLKIO_WEIGHT_INVALID; |
| return 0; |
| } |
| |
| r = safe_atou64(s, &u); |
| if (r < 0) |
| return r; |
| |
| if (u < CGROUP_BLKIO_WEIGHT_MIN || u > CGROUP_BLKIO_WEIGHT_MAX) |
| return -ERANGE; |
| |
| *ret = u; |
| return 0; |
| } |
| |
| static const char *cgroup_controller_table[_CGROUP_CONTROLLER_MAX] = { |
| [CGROUP_CONTROLLER_CPU] = "cpu", |
| [CGROUP_CONTROLLER_CPUACCT] = "cpuacct", |
| [CGROUP_CONTROLLER_IO] = "io", |
| [CGROUP_CONTROLLER_BLKIO] = "blkio", |
| [CGROUP_CONTROLLER_MEMORY] = "memory", |
| [CGROUP_CONTROLLER_DEVICES] = "devices", |
| [CGROUP_CONTROLLER_PIDS] = "pids", |
| }; |
| |
| DEFINE_STRING_TABLE_LOOKUP(cgroup_controller, CGroupController); |