| /*-*- 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 "log.h" |
| #include "set.h" |
| #include "macro.h" |
| #include "util.h" |
| #include "path-util.h" |
| #include "strv.h" |
| #include "unit-name.h" |
| #include "fileio.h" |
| #include "special.h" |
| #include "mkdir.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(trivial_hash_func, trivial_compare_func); |
| 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) |
| 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(trivial_hash_func, trivial_compare_func); |
| 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(trivial_hash_func, trivial_compare_func); |
| 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 (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) |
| return "systemd"; |
| else 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; |
| |
| path_kill_slashes(t); |
| |
| *fs = 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, true)) |
| return -EINVAL; |
| |
| 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_hierarchy(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(fs); |
| |
| if (!cg_controller_is_valid(controller, true)) |
| 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), "%lu\n", (unsigned long) pid); |
| |
| return write_string_file(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_t) -1) |
| 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_t) -1 && uid == (uid_t) -1 && gid == (gid_t) -1) |
| return 0; |
| |
| if (mode != (mode_t) -1) |
| 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, true)) |
| 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, *w, *e; |
| size_t k; |
| char *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(w, k, l, ",", state) { |
| |
| if (k == cs && memcmp(w, controller, cs) == 0) { |
| found = true; |
| break; |
| } |
| |
| if (k == 5 + cs && |
| memcmp(w, "name=", 5) == 0 && |
| memcmp(w+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(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(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(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(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_kill_slashes(t); |
| *path = t; |
| } |
| |
| if (controller) |
| *controller = NULL; |
| |
| return 0; |
| } |
| |
| e = strchr(spec, ':'); |
| if (!e) { |
| if (!cg_controller_is_valid(spec, true)) |
| 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, true)) { |
| 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; |
| |
| path_kill_slashes(t); |
| *result = 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 *e, *c, *s; |
| |
| assert(cgroup); |
| assert(unit); |
| |
| e = strchrnul(cgroup, '/'); |
| c = strndupa(cgroup, e - cgroup); |
| c = cg_unescape(c); |
| |
| if (!unit_name_is_valid(c, TEMPLATE_INVALID)) |
| return -EINVAL; |
| |
| s = strdup(c); |
| if (!s) |
| return -ENOMEM; |
| |
| *unit = s; |
| return 0; |
| } |
| |
| static const char *skip_slices(const char *p) { |
| /* Skips over all slice assignments */ |
| |
| for (;;) { |
| size_t n; |
| |
| p += strspn(p, "/"); |
| |
| n = strcspn(p, "/"); |
| if (n <= 6 || memcmp(p + n - 6, ".slice", 6) != 0) |
| return p; |
| |
| p += n; |
| } |
| } |
| |
| int cg_path_get_unit(const char *path, char **unit) { |
| const char *e; |
| |
| assert(path); |
| assert(unit); |
| |
| e = skip_slices(path); |
| |
| return cg_path_decode_unit(e, unit); |
| } |
| |
| 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; |
| |
| assert(p); |
| |
| p += strspn(p, "/"); |
| |
| n = strcspn(p, "/"); |
| if (n < strlen("session-x.scope") || memcmp(p, "session-", 8) != 0 || memcmp(p + n - 6, ".scope", 6) != 0) |
| return NULL; |
| |
| p += n; |
| p += strspn(p, "/"); |
| |
| return p; |
| } |
| |
| /** |
| * Skip user@*.service, but require it to be there. |
| */ |
| static const char *skip_user_manager(const char *p) { |
| size_t n; |
| |
| assert(p); |
| |
| p += strspn(p, "/"); |
| |
| n = strcspn(p, "/"); |
| if (n < strlen("user@x.service") || memcmp(p, "user@", 5) != 0 || memcmp(p + n - 8, ".service", 8) != 0) |
| return NULL; |
| |
| p += n; |
| p += strspn(p, "/"); |
| |
| return p; |
| } |
| |
| int cg_path_get_user_unit(const char *path, char **unit) { |
| const char *e, *t; |
| |
| assert(path); |
| assert(unit); |
| |
| /* We always have to parse the path from the beginning as unit |
| * cgroups might have arbitrary child cgroups and we shouldn't get |
| * confused by those */ |
| |
| /* Skip slices, if there are any */ |
| e = skip_slices(path); |
| |
| /* Skip the session scope... */ |
| t = skip_session(e); |
| if (t) |
| /* ... and skip more slices if there's one */ |
| e = skip_slices(t); |
| else { |
| /* ... or require a user manager unit to be there */ |
| e = skip_user_manager(e); |
| if (!e) |
| return -ENOENT; |
| } |
| |
| return cg_path_decode_unit(e, unit); |
| } |
| |
| 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) { |
| const char *e, *n, *x; |
| char *s; |
| size_t l; |
| |
| assert(path); |
| |
| /* Skip slices, if there are any */ |
| e = skip_slices(path); |
| |
| n = strchrnul(e, '/'); |
| if (e == n) |
| return -ENOENT; |
| |
| s = strndupa(e, n - e); |
| s = cg_unescape(s); |
| |
| x = startswith(s, "session-"); |
| if (!x) |
| return -ENOENT; |
| if (!endswith(x, ".scope")) |
| return -ENOENT; |
| |
| l = strlen(x); |
| if (l <= 6) |
| return -ENOENT; |
| |
| if (session) { |
| char *r; |
| |
| r = strndup(x, l - 6); |
| if (!r) |
| return -ENOMEM; |
| |
| *session = r; |
| } |
| |
| 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; |
| const char *start, *end; |
| char *s; |
| uid_t u; |
| int r; |
| |
| assert(path); |
| |
| r = cg_path_get_slice(path, &slice); |
| if (r < 0) |
| return r; |
| |
| start = startswith(slice, "user-"); |
| if (!start) |
| return -ENOENT; |
| end = endswith(slice, ".slice"); |
| if (!end) |
| return -ENOENT; |
| |
| s = strndupa(start, end - start); |
| if (!s) |
| return -ENOENT; |
| |
| if (parse_uid(s, &u) < 0) |
| return -EIO; |
| |
| if (uid) |
| *uid = u; |
| |
| 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; |
| size_t m = 0; |
| |
| assert(p); |
| assert(slice); |
| |
| for (;;) { |
| size_t n; |
| |
| p += strspn(p, "/"); |
| |
| n = strcspn(p, "/"); |
| if (n <= 6 || memcmp(p + n - 6, ".slice", 6) != 0) { |
| char *s; |
| |
| if (!e) |
| return -ENOENT; |
| |
| s = strndup(e, m); |
| if (!s) |
| return -ENOMEM; |
| |
| *slice = s; |
| return 0; |
| } |
| |
| e = p; |
| m = n; |
| |
| 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); |
| } |
| |
| 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, bool allow_named) { |
| const char *t, *s; |
| |
| if (!p) |
| return false; |
| |
| if (allow_named) { |
| 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; |
| |
| assert(unit); |
| assert(ret); |
| |
| if (!unit_name_is_valid(unit, TEMPLATE_INVALID)) |
| return -EINVAL; |
| |
| if (!endswith(unit, ".slice")) |
| return -EINVAL; |
| |
| p = unit_name_to_prefix(unit); |
| if (!p) |
| return -ENOMEM; |
| |
| dash = strchr(p, '-'); |
| while (dash) { |
| _cleanup_free_ char *escaped = NULL; |
| char n[dash - p + sizeof(".slice")]; |
| |
| strcpy(stpncpy(n, p, dash - p), ".slice"); |
| |
| if (!unit_name_is_valid(n, TEMPLATE_INVALID)) |
| 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); |
| } |
| |
| 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) { |
| 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) |
| cg_attach_fallback(n, path, pid); |
| |
| bit <<= 1; |
| } |
| |
| return 0; |
| } |
| |
| int cg_attach_many_everywhere(CGroupControllerMask supported, const char *path, Set* pids) { |
| 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); |
| 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; |
| } |