#include "path-util.h"
#include "strv.h"
#include "unit-name.h"
+#include "fileio.h"
+#include "special.h"
int cg_enumerate_processes(const char *controller, const char *path, FILE **_f) {
- char *fs;
- int r;
+ _cleanup_free_ char *fs = NULL;
FILE *f;
-
- assert(path);
- assert(_f);
-
- r = cg_get_path(controller, path, "cgroup.procs", &fs);
- if (r < 0)
- return r;
-
- f = fopen(fs, "re");
- free(fs);
-
- if (!f)
- return -errno;
-
- *_f = f;
- return 0;
-}
-
-int cg_enumerate_tasks(const char *controller, const char *path, FILE **_f) {
- char *fs;
int r;
- FILE *f;
- assert(path);
assert(_f);
- r = cg_get_path(controller, path, "tasks", &fs);
+ r = cg_get_path(controller, path, "cgroup.procs", &fs);
if (r < 0)
return r;
f = fopen(fs, "re");
- free(fs);
-
if (!f)
return -errno;
/* 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) {
}
int cg_enumerate_subgroups(const char *controller, const char *path, DIR **_d) {
- char *fs;
+ _cleanup_free_ char *fs = NULL;
int r;
DIR *d;
- assert(path);
assert(_d);
/* This is not recursive! */
return r;
d = opendir(fs);
- free(fs);
-
if (!d)
return -errno;
struct dirent *de;
assert(d);
+ assert(fn);
- errno = 0;
- while ((de = readdir(d))) {
+ FOREACH_DIRENT(de, d, return -errno) {
char *b;
if (de->d_type != DT_DIR)
streq(de->d_name, ".."))
continue;
- if (!(b = strdup(de->d_name)))
+ b = strdup(de->d_name);
+ if (!b)
return -ENOMEM;
*fn = b;
return 1;
}
- if (errno)
- return -errno;
-
return 0;
}
-int cg_rmdir(const char *controller, const char *path, bool honour_sticky) {
- char *p;
+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;
- if (honour_sticky) {
- char *tasks;
-
- /* If the sticky bit is set don't remove the directory */
-
- tasks = strappend(p, "/tasks");
- if (!tasks) {
- free(p);
- return -ENOMEM;
- }
-
- r = file_is_priv_sticky(tasks);
- free(tasks);
-
- if (r > 0) {
- free(p);
- return 0;
- }
- }
-
r = rmdir(p);
- free(p);
+ if (r < 0 && errno != ENOENT)
+ return -errno;
- return (r < 0 && errno != ENOENT) ? -errno : 0;
+ 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;
- FILE *f = NULL;
- Set *allocated_set = NULL;
- assert(controller);
- assert(path);
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)
- if (!(s = allocated_set = set_new(trivial_hash_func, trivial_compare_func)))
+ 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;
- if ((r = cg_enumerate_processes(controller, path, &f)) < 0) {
+ r = cg_enumerate_processes(controller, path, &f);
+ if (r < 0) {
if (ret >= 0 && r != -ENOENT)
- ret = r;
+ return r;
- goto finish;
+ return ret;
}
while ((r = cg_read_pid(f, &pid)) > 0) {
- if (pid == my_pid && ignore_self)
+ if (ignore_self && pid == my_pid)
continue;
if (set_get(s, LONG_TO_PTR(pid)) == LONG_TO_PTR(pid))
done = false;
- if ((r = set_put(s, LONG_TO_PTR(pid))) < 0) {
+ r = set_put(s, LONG_TO_PTR(pid));
+ if (r < 0) {
if (ret >= 0)
- ret = r;
+ return r;
- goto finish;
+ return ret;
}
}
if (r < 0) {
if (ret >= 0)
- ret = r;
+ return r;
- goto finish;
+ return ret;
}
- fclose(f);
- f = NULL;
-
/* 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);
-finish:
- if (allocated_set)
- set_free(allocated_set);
-
- if (f)
- fclose(f);
-
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;
- DIR *d = NULL;
char *fn;
- Set *allocated_set = NULL;
assert(path);
- assert(controller);
assert(sig >= 0);
- if (!s)
- if (!(s = allocated_set = set_new(trivial_hash_func, trivial_compare_func)))
+ 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);
- if ((r = cg_enumerate_subgroups(controller, path, &d)) < 0) {
+ r = cg_enumerate_subgroups(controller, path, &d);
+ if (r < 0) {
if (ret >= 0 && r != -ENOENT)
- ret = r;
+ return r;
- goto finish;
+ return ret;
}
while ((r = cg_read_subgroup(d, &fn)) > 0) {
- char *p = NULL;
+ _cleanup_free_ char *p = NULL;
- r = asprintf(&p, "%s/%s", path, fn);
+ p = strjoin(path, "/", fn, NULL);
free(fn);
-
- if (r < 0) {
- if (ret >= 0)
- ret = -ENOMEM;
-
- goto finish;
- }
+ if (!p)
+ return -ENOMEM;
r = cg_kill_recursive(controller, p, sig, sigcont, ignore_self, rem, s);
- free(p);
-
- if (r != 0 && ret >= 0)
+ if (ret >= 0 && r != 0)
ret = r;
}
- if (r < 0 && ret >= 0)
+ if (ret >= 0 && r < 0)
ret = r;
- if (rem)
- if ((r = cg_rmdir(controller, path, true)) < 0) {
- if (ret >= 0 &&
- r != -ENOENT &&
- r != -EBUSY)
- ret = r;
- }
-
-finish:
- if (d)
- closedir(d);
-
- if (allocated_set)
- set_free(allocated_set);
+ if (rem) {
+ r = cg_rmdir(controller, path);
+ if (r < 0 && ret >= 0 && r != -ENOENT && r != -EBUSY)
+ return r;
+ }
return ret;
}
unsigned i;
assert(path);
- assert(controller);
/* This safely kills all processes; first it sends a SIGTERM,
* then checks 8 times after 200ms whether the group is now
else
sig = 0;
- if ((r = cg_kill_recursive(controller, path, sig, true, true, rem, NULL)) <= 0)
+ r = cg_kill_recursive(controller, path, sig, true, true, rem, NULL);
+ if (r <= 0)
return r;
usleep(200 * USEC_PER_MSEC);
_cleanup_set_free_ Set *s = NULL;
int r, ret = 0;
pid_t my_pid;
- _cleanup_fclose_ FILE *f = NULL;
assert(cfrom);
assert(pfrom);
my_pid = getpid();
do {
+ _cleanup_fclose_ FILE *f = NULL;
pid_t pid = 0;
done = true;
- r = cg_enumerate_tasks(cfrom, pfrom, &f);
+ r = cg_enumerate_processes(cfrom, pfrom, &f);
if (r < 0) {
if (ret >= 0 && r != -ENOENT)
- ret = r;
+ return r;
return ret;
}
/* This might do weird stuff if we aren't a
* single-threaded program. However, we
* luckily know we are not */
- if (pid == my_pid && ignore_self)
+ if (ignore_self && pid == my_pid)
continue;
if (set_get(s, LONG_TO_PTR(pid)) == LONG_TO_PTR(pid))
r = set_put(s, LONG_TO_PTR(pid));
if (r < 0) {
if (ret >= 0)
- ret = r;
+ return r;
return ret;
}
if (r < 0) {
if (ret >= 0)
- ret = r;
+ return r;
return ret;
}
-
- fclose(f);
- f = NULL;
} 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) {
- int r, ret = 0;
+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);
r = cg_enumerate_subgroups(cfrom, pfrom, &d);
if (r < 0) {
if (ret >= 0 && r != -ENOENT)
- ret = r;
+ return r;
+
return ret;
}
free(fn);
if (!p) {
if (ret >= 0)
- ret = -ENOMEM;
+ return -ENOMEM;
return ret;
}
ret = r;
if (rem) {
- r = cg_rmdir(cfrom, pfrom, true);
+ r = cg_rmdir(cfrom, pfrom);
if (r < 0 && ret >= 0 && r != -ENOENT && r != -EBUSY)
return r;
}
static const char *normalize_controller(const char *controller) {
+ assert(controller);
+
if (streq(controller, SYSTEMD_CGROUP_CONTROLLER))
return "systemd";
else if (startswith(controller, "name="))
static int join_path(const char *controller, const char *path, const char *suffix, char **fs) {
char *t = NULL;
- if (!(controller || path))
- return -EINVAL;
-
- if (controller) {
- if (path && suffix)
+ if (!isempty(controller)) {
+ if (!isempty(path) && !isempty(suffix))
t = strjoin("/sys/fs/cgroup/", controller, "/", path, "/", suffix, NULL);
- else if (path)
+ else if (!isempty(path))
t = strjoin("/sys/fs/cgroup/", controller, "/", path, NULL);
- else if (suffix)
+ else if (!isempty(suffix))
t = strjoin("/sys/fs/cgroup/", controller, "/", suffix, NULL);
else
- t = strjoin("/sys/fs/cgroup/", controller, NULL);
+ t = strappend("/sys/fs/cgroup/", controller);
} else {
- if (path && suffix)
+ if (!isempty(path) && !isempty(suffix))
t = strjoin(path, "/", suffix, NULL);
- else if (path)
+ else if (!isempty(path))
t = strdup(path);
+ else
+ return -EINVAL;
}
if (!t)
assert(fs);
+ if (controller && !cg_controller_is_valid(controller, true))
+ return -EINVAL;
+
if (_unlikely_(!good)) {
int r;
}
p = controller ? normalize_controller(controller) : NULL;
+
return join_path(p, path, suffix, fs);
}
-static int check(const char *p) {
+static int check_hierarchy(const char *p) {
char *cc;
assert(p);
const char *p;
int r;
- assert(controller);
assert(fs);
- if (isempty(controller))
+ 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(p);
+ r = check_hierarchy(p);
if (r < 0)
return r;
}
static int trim_cb(const char *path, const struct stat *sb, int typeflag, struct FTW *ftwbuf) {
- char *p;
- bool is_sticky;
+ assert(path);
+ assert(sb);
+ assert(ftwbuf);
if (typeflag != FTW_DP)
return 0;
if (ftwbuf->level < 1)
return 0;
- p = strappend(path, "/tasks");
- if (!p) {
- errno = ENOMEM;
- return 1;
- }
-
- is_sticky = file_is_priv_sticky(p) > 0;
- free(p);
-
- if (is_sticky)
- return 0;
-
rmdir(path);
return 0;
}
int cg_trim(const char *controller, const char *path, bool delete_root) {
- char *fs;
+ _cleanup_free_ char *fs = NULL;
int r = 0;
- assert(controller);
assert(path);
r = cg_get_path(controller, path, NULL, &fs);
return r;
errno = 0;
- if (nftw(fs, trim_cb, 64, FTW_DEPTH|FTW_MOUNT|FTW_PHYS) < 0)
+ if (nftw(fs, trim_cb, 64, FTW_DEPTH|FTW_MOUNT|FTW_PHYS) != 0)
r = errno ? -errno : -EIO;
if (delete_root) {
- bool is_sticky;
- char *p;
-
- p = strappend(fs, "/tasks");
- if (!p) {
- free(fs);
- return -ENOMEM;
- }
-
- is_sticky = file_is_priv_sticky(p) > 0;
- free(p);
-
- if (!is_sticky)
- if (rmdir(fs) < 0 && errno != ENOENT) {
- if (r == 0)
- r = -errno;
- }
+ if (rmdir(fs) < 0 && errno != ENOENT)
+ return -errno;
}
- free(fs);
-
return r;
}
int cg_delete(const char *controller, const char *path) {
- char *parent;
+ _cleanup_free_ char *parent = NULL;
int r;
- assert(controller);
assert(path);
- if ((r = path_get_parent(path, &parent)) < 0)
+ r = path_get_parent(path, &parent);
+ if (r < 0)
return r;
r = cg_migrate_recursive(controller, path, controller, parent, false, true);
- free(parent);
-
return r == -ENOENT ? 0 : r;
}
int cg_attach(const char *controller, const char *path, pid_t pid) {
- char *fs;
+ _cleanup_free_ char *fs = NULL;
+ char c[DECIMAL_STR_MAX(pid_t) + 2];
int r;
- char c[32];
- assert(controller);
assert(path);
assert(pid >= 0);
- r = cg_get_path_and_check(controller, path, "tasks", &fs);
+ r = cg_get_path_and_check(controller, path, "cgroup.procs", &fs);
if (r < 0)
return r;
pid = getpid();
snprintf(c, sizeof(c), "%lu\n", (unsigned long) pid);
- char_array_0(c);
- r = write_one_line_file(fs, c);
- free(fs);
-
- return r;
+ return write_string_file(fs, c);
}
-int cg_set_group_access(const char *controller, const char *path, mode_t mode, uid_t uid, gid_t gid) {
- char *fs;
+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(controller);
assert(path);
if (mode != (mode_t) -1)
if (r < 0)
return r;
- r = chmod_and_chown(fs, mode, uid, gid);
- free(fs);
-
- 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, int sticky) {
- char *fs;
+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(controller);
assert(path);
- if (mode == (mode_t) -1 && uid == (uid_t) -1 && gid == (gid_t) -1 && sticky < 0)
+ 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, "tasks", &fs);
+ r = cg_get_path(controller, path, "cgroup.procs", &fs);
if (r < 0)
return r;
- if (sticky >= 0 && mode != (mode_t) -1)
- /* Both mode and sticky param are passed */
- mode |= (sticky ? S_ISVTX : 0);
- else if ((sticky >= 0 && mode == (mode_t) -1) ||
- (mode != (mode_t) -1 && sticky < 0)) {
- struct stat st;
-
- /* Only one param is passed, hence read the current
- * mode from the file itself */
-
- r = lstat(fs, &st);
- if (r < 0) {
- free(fs);
- return -errno;
- }
-
- if (mode == (mode_t) -1)
- /* No mode set, we just shall set the sticky bit */
- mode = (st.st_mode & ~S_ISVTX) | (sticky ? S_ISVTX : 0);
- else
- /* Only mode set, leave sticky bit untouched */
- mode = (st.st_mode & ~0777) | mode;
- }
-
r = chmod_and_chown(fs, mode, uid, gid);
- free(fs);
+ if (r < 0)
+ return r;
- 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_get_by_pid(const char *controller, pid_t pid, char **path) {
- int r;
- char *p = NULL;
- FILE *f;
- char *fs;
+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(controller);
assert(path);
assert(pid >= 0);
- if (pid == 0)
- pid = getpid();
+ if (controller) {
+ if (!cg_controller_is_valid(controller, true))
+ return -EINVAL;
- if (asprintf(&fs, "/proc/%lu/cgroup", (unsigned long) pid) < 0)
- return -ENOMEM;
+ controller = normalize_controller(controller);
+ } else
+ controller = SYSTEMD_CGROUP_CONTROLLER;
- f = fopen(fs, "re");
- free(fs);
+ if (pid == 0)
+ fs = "/proc/self/cgroup";
+ else
+ fs = procfs_file_alloca(pid, "cgroup");
+ f = fopen(fs, "re");
if (!f)
return errno == ENOENT ? -ESRCH : -errno;
cs = strlen(controller);
- while (!feof(f)) {
- char line[LINE_MAX];
- char *l;
-
- errno = 0;
- if (!(fgets(line, sizeof(line), f))) {
- if (feof(f))
- break;
-
- r = errno ? -errno : -EIO;
- goto finish;
- }
+ FOREACH_LINE(line, f, return -errno) {
+ char *l, *p, *w, *e;
+ size_t k;
+ char *state;
+ bool found = false;
truncate_nl(line);
- if (!(l = strchr(line, ':')))
+ l = strchr(line, ':');
+ if (!l)
continue;
l++;
- if (!strneq(l, controller, cs))
+ e = strchr(l, ':');
+ if (!e)
continue;
- if (l[cs] != ':')
- continue;
+ *e = 0;
- if (!(p = strdup(l + cs + 1))) {
- r = -ENOMEM;
- goto finish;
+ 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;
+ }
}
- *path = p;
- r = 0;
- goto finish;
- }
+ if (!found)
+ continue;
- r = -ENOENT;
+ p = strdup(e + 1);
+ if (!p)
+ return -ENOMEM;
-finish:
- fclose(f);
+ *path = p;
+ return 0;
+ }
- return r;
+ return -ENOENT;
}
int cg_install_release_agent(const char *controller, const char *agent) {
- char *fs = NULL, *contents = NULL, *line = NULL, *sc;
+ _cleanup_free_ char *fs = NULL, *contents = NULL;
+ char *sc;
int r;
- assert(controller);
assert(agent);
- if ((r = cg_get_path(controller, NULL, "release_agent", &fs)) < 0)
+ r = cg_get_path(controller, NULL, "release_agent", &fs);
+ if (r < 0)
return r;
- if ((r = read_one_line_file(fs, &contents)) < 0)
- goto finish;
+ r = read_one_line_file(fs, &contents);
+ if (r < 0)
+ return r;
sc = strstrip(contents);
if (sc[0] == 0) {
-
- if (asprintf(&line, "%s\n", agent) < 0) {
- r = -ENOMEM;
- goto finish;
- }
-
- if ((r = write_one_line_file(fs, line)) < 0)
- goto finish;
-
- } else if (!streq(sc, agent)) {
- r = -EEXIST;
- goto finish;
- }
+ r = write_string_file(fs, agent);
+ if (r < 0)
+ return r;
+ } else if (!streq(sc, agent))
+ return -EEXIST;
free(fs);
fs = NULL;
- if ((r = cg_get_path(controller, NULL, "notify_on_release", &fs)) < 0)
- goto finish;
+ r = cg_get_path(controller, NULL, "notify_on_release", &fs);
+ if (r < 0)
+ return r;
free(contents);
contents = NULL;
- if ((r = read_one_line_file(fs, &contents)) < 0)
- goto finish;
+ r = read_one_line_file(fs, &contents);
+ if (r < 0)
+ return r;
sc = strstrip(contents);
-
if (streq(sc, "0")) {
- if ((r = write_one_line_file(fs, "1\n")) < 0)
- goto finish;
+ r = write_string_file(fs, "1");
+ if (r < 0)
+ return r;
- r = 1;
- } else if (!streq(sc, "1")) {
- r = -EIO;
- goto finish;
- } else
- r = 0;
+ return 1;
+ }
-finish:
- free(fs);
- free(contents);
- free(line);
+ if (!streq(sc, "1"))
+ return -EIO;
- 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;
- int r;
- FILE *f = NULL;
bool found = false;
+ int r;
assert(path);
- r = cg_enumerate_tasks(controller, path, &f);
+ r = cg_enumerate_processes(controller, path, &f);
if (r < 0)
return r == -ENOENT ? 1 : r;
break;
}
- fclose(f);
-
if (r < 0)
return r;
}
int cg_is_empty_by_spec(const char *spec, bool ignore_self) {
- int r;
_cleanup_free_ char *controller = NULL, *path = NULL;
+ int r;
assert(spec);
}
int cg_is_empty_recursive(const char *controller, const char *path, bool ignore_self) {
- int r;
- DIR *d = NULL;
+ _cleanup_closedir_ DIR *d = NULL;
char *fn;
+ int r;
assert(path);
return r == -ENOENT ? 1 : r;
while ((r = cg_read_subgroup(d, &fn)) > 0) {
- char *p = NULL;
+ _cleanup_free_ char *p = NULL;
- r = asprintf(&p, "%s/%s", path, fn);
+ p = strjoin(path, "/", fn, NULL);
free(fn);
-
- if (r < 0) {
- r = -ENOMEM;
- goto finish;
- }
+ if (!p)
+ return -ENOMEM;
r = cg_is_empty_recursive(controller, p, ignore_self);
- free(p);
-
if (r <= 0)
- goto finish;
+ return r;
}
- if (r >= 0)
- r = 1;
-
-finish:
-
- if (d)
- closedir(d);
+ if (r < 0)
+ return r;
- 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 (!t)
return -ENOMEM;
+ path_kill_slashes(t);
*path = t;
}
e = strchr(spec, ':');
if (!e) {
- if (!filename_is_safe(spec))
+ if (!cg_controller_is_valid(spec, true))
return -EINVAL;
if (controller) {
- t = strdup(spec);
+ t = strdup(normalize_controller(spec));
if (!t)
return -ENOMEM;
return 0;
}
- t = strndup(spec, e-spec);
+ v = strndup(spec, e-spec);
+ if (!v)
+ return -ENOMEM;
+ t = strdup(normalize_controller(v));
if (!t)
return -ENOMEM;
- if (!filename_is_safe(t)) {
+ if (!cg_controller_is_valid(t, true)) {
free(t);
return -EINVAL;
}
free(t);
return -ENOMEM;
}
- if (!path_is_safe(u)) {
+ if (!path_is_safe(u) ||
+ !path_is_absolute(u)) {
free(t);
free(u);
return -EINVAL;
}
+ path_kill_slashes(u);
+
if (controller)
*controller = t;
else
}
int cg_join_spec(const char *controller, const char *path, char **spec) {
- assert(controller);
+ char *s;
+
assert(path);
- if (!path_is_absolute(path) ||
- controller[0] == 0 ||
- strchr(controller, ':') ||
- strchr(controller, '/'))
+ if (!controller)
+ controller = "systemd";
+ else {
+ if (!cg_controller_is_valid(controller, true))
+ return -EINVAL;
+
+ controller = normalize_controller(controller);
+ }
+
+ if (!path_is_absolute(path))
return -EINVAL;
- if (asprintf(spec, "%s:%s", controller, path) < 0)
+ s = strjoin(controller, ":", path, NULL);
+ if (!s)
return -ENOMEM;
+ path_kill_slashes(s + strlen(controller) + 1);
+
+ *spec = s;
return 0;
}
-int cg_fix_path(const char *path, char **result) {
- char *t, *c, *p;
+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") &&
- access(path, F_OK) >= 0) {
+ if (path_startswith(path, "/sys/fs/cgroup")) {
t = strdup(path);
if (!t)
return -ENOMEM;
+ path_kill_slashes(t);
*result = t;
return 0;
}
if (r < 0)
return r;
- r = cg_get_path(c ? c : SYSTEMD_CGROUP_CONTROLLER, p ? p : "/", NULL, result);
- free(c);
- free(p);
-
- return r;
+ return cg_get_path(c ? c : SYSTEMD_CGROUP_CONTROLLER, p ? p : "/", NULL, result);
}
-int cg_get_user_path(char **path) {
- char *root, *p;
+int cg_get_root_path(char **path) {
+ char *p, *e;
+ int r;
assert(path);
- /* Figure out the place to put user cgroups below. We use the
- * same as PID 1 has but with the "/system" suffix replaced by
- * "/user" */
-
- if (cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 1, &root) < 0)
- p = strdup("/user");
- else {
- if (endswith(root, "/system"))
- root[strlen(root) - 7] = 0;
- else if (streq(root, "/"))
- root[0] = 0;
+ r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 1, &p);
+ if (r < 0)
+ return r;
- p = strappend(root, "/user");
- free(root);
- }
-
- if (!p)
- return -ENOMEM;
+ e = endswith(p, "/" SPECIAL_SYSTEM_SLICE);
+ if (e)
+ *e = 0;
*path = p;
return 0;
char **cg_shorten_controllers(char **controllers) {
char **f, **t;
- controllers = strv_uniq(controllers);
-
if (!controllers)
return controllers;
for (f = controllers, t = controllers; *f; f++) {
- int r;
const char *p;
+ int r;
+
+ p = normalize_controller(*f);
- if (streq(*f, "systemd") || streq(*f, SYSTEMD_CGROUP_CONTROLLER)) {
+ if (streq(p, "systemd")) {
free(*f);
continue;
}
- p = normalize_controller(*f);
+ if (!cg_controller_is_valid(p, true)) {
+ log_warning("Controller %s is not valid, removing from controllers list.", p);
+ free(*f);
+ continue;
+ }
- r = check(p);
+ r = check_hierarchy(p);
if (r < 0) {
- log_debug("Controller %s is not available, removing from controllers list.", *f);
+ log_debug("Controller %s is not available, removing from controllers list.", p);
free(*f);
continue;
}
}
*t = NULL;
- return controllers;
+ return strv_uniq(controllers);
}
-int cg_pid_get_cgroup(pid_t pid, char **root, char **cgroup) {
- char *cg_process, *cg_init, *p;
+int cg_pid_get_path_shifted(pid_t pid, char **root, char **cgroup) {
+ _cleanup_free_ char *cg_root = NULL;
+ char *cg_process, *p;
int r;
- assert(pid >= 0);
-
- if (pid == 0)
- pid = getpid();
-
- r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &cg_process);
+ r = cg_get_root_path(&cg_root);
if (r < 0)
return r;
- r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 1, &cg_init);
- if (r < 0) {
- free(cg_process);
+ r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &cg_process);
+ if (r < 0)
return r;
- }
-
- if (endswith(cg_init, "/system"))
- cg_init[strlen(cg_init)-7] = 0;
- else if (streq(cg_init, "/"))
- cg_init[0] = 0;
- if (startswith(cg_process, cg_init))
- p = cg_process + strlen(cg_init);
+ p = path_startswith(cg_process, cg_root);
+ if (p)
+ p--;
else
p = cg_process;
- free(cg_init);
-
if (cgroup) {
char* c;
return 0;
}
-static int instance_unit_from_cgroup(char *cgroup){
- char *at;
+int cg_path_decode_unit(const char *cgroup, char **unit){
+ char *p, *e, *c, *s, *k;
assert(cgroup);
+ assert(unit);
- at = strstr(cgroup, "@.");
- if (at) {
- /* This is a templated service */
+ e = strchrnul(cgroup, '/');
+ c = strndupa(cgroup, e - cgroup);
+ c = cg_unescape(c);
- char *i;
- char _cleanup_free_ *i2 = NULL, *s = NULL;
+ /* Could this be a valid unit name? */
+ if (!unit_name_is_valid(c, true))
+ return -EINVAL;
- i = strchr(at, '/');
- if (!i || !i[1]) /* disallow empty instances */
+ if (!unit_name_is_template(c))
+ s = strdup(c);
+ else {
+ if (*e != '/')
return -EINVAL;
- s = strndup(at + 1, i - at - 1);
- i2 = strdup(i + 1);
- if (!s || !i2)
- return -ENOMEM;
+ e += strspn(e, "/");
+
+ p = strchrnul(e, '/');
+ k = strndupa(e, p - e);
+ k = cg_unescape(k);
- strcpy(at + 1, i2);
- strcat(at + 1, s);
+ if (!unit_name_is_valid(k, false))
+ return -EINVAL;
+
+ s = strdup(k);
}
+ if (!s)
+ return -ENOMEM;
+
+ *unit = s;
return 0;
}
-/* non-static only for testing purposes */
-int cgroup_to_unit(char *cgroup, char **unit){
+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;
- char *p;
- assert(cgroup);
assert(unit);
- r = instance_unit_from_cgroup(cgroup);
+ r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
if (r < 0)
return r;
- p = strrchr(cgroup, '/');
+ return cg_path_get_unit(cgroup, unit);
+}
+
+static const char *skip_session(const char *p) {
+ size_t n;
+
assert(p);
- r = unit_name_is_valid(p + 1, true);
+ p += strspn(p, "/");
+
+ n = strcspn(p, "/");
+ if (n <= 12 || memcmp(p, "session-", 8) != 0 || memcmp(p + n - 6, ".scope", 6) != 0)
+ return NULL;
+
+ p += n;
+ p += strspn(p, "/");
+
+ return p;
+}
+
+int cg_path_get_user_unit(const char *path, char **unit) {
+ const char *e;
+
+ 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, require that there is one */
+ e = skip_session(e);
+ if (!e)
+ return -ENOENT;
+
+ /* And skip more slices */
+ e = skip_slices(e);
+
+ 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) {
+ const char *e, *n, *x;
+ char *s, *r;
+ size_t l;
+
+ assert(path);
+ assert(machine);
+
+ /* 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, "machine-");
+ if (!x)
+ return -ENOENT;
+ if (!endswith(x, ".scope"))
+ return -ENOENT;
+
+ l = strlen(x);
+ if (l <= 6)
+ return -ENOENT;
+
+ r = strndup(x, l - 6);
if (!r)
- return -EINVAL;
+ return -ENOMEM;
+
+ *machine = r;
+ return 0;
+}
+
+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, *r;
+ size_t l;
+
+ assert(path);
+ assert(session);
+
+ /* Skip slices, if there are any */
+ e = skip_slices(path);
+
+ n = strchrnul(e, '/');
+ if (e == n)
+ return -ENOENT;
- *unit = strdup(p + 1);
- if (!*unit)
+ 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;
+
+ r = strndup(x, l - 6);
+ if (!r)
return -ENOMEM;
+ *session = r;
return 0;
}
-static int cg_pid_get(const char *prefix, pid_t pid, char **unit) {
+int cg_pid_get_session(pid_t pid, char **session) {
+ _cleanup_free_ char *cgroup = NULL;
int r;
- char _cleanup_free_ *cgroup = NULL;
- assert(pid >= 0);
- assert(unit);
+ assert(session);
+
+ 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 *e;
+ char *s;
+ int r;
+
+ assert(path);
+ assert(uid);
- r = cg_pid_get_cgroup(pid, NULL, &cgroup);
+ r = cg_path_get_slice(path, &slice);
if (r < 0)
return r;
- if (!startswith(cgroup, prefix))
+ e = startswith(slice, "user-");
+ if (!e)
+ return -ENOENT;
+ if (!endswith(slice, ".slice"))
return -ENOENT;
- r = cgroup_to_unit(cgroup, unit);
- return r;
+ s = strndupa(e, strlen(e) - 6);
+ if (!s)
+ return -ENOMEM;
+
+ return parse_uid(s, uid);
}
-int cg_pid_get_unit(pid_t pid, char **unit) {
- return cg_pid_get("/system/", pid, unit);
+int cg_pid_get_owner_uid(pid_t pid, uid_t *uid) {
+ _cleanup_free_ char *cgroup = NULL;
+ int r;
+
+ assert(uid);
+
+ r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
+ if (r < 0)
+ return r;
+
+ return cg_path_get_owner_uid(cgroup, uid);
}
-int cg_pid_get_user_unit(pid_t pid, char **unit) {
- return cg_pid_get("/user/", pid, unit);
+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);
}
int cg_controller_from_attr(const char *attr, char **controller) {
if (!c)
return -ENOMEM;
- if (!filename_is_safe(c)) {
+ if (!cg_controller_is_valid(c, false)) {
free(c);
return -EINVAL;
}
*controller = c;
return 1;
}
+
+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 \
+ "0123456789" \
+ "abcdefghijklmnopqrstuvwxyz" \
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZ" \
+ "_"
+
+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, false))
+ 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, false))
+ 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_with_mask(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 (bit & mask)
+ cg_create(n, path);
+ else
+ cg_trim(n, path, true);
+
+ bit <<= 1;
+ }
+
+ return r;
+}
+
+int cg_attach_with_mask(CGroupControllerMask mask, const char *path, pid_t pid) {
+ CGroupControllerMask bit = 1;
+ const char *n;
+ int r;
+
+ r = cg_attach(SYSTEMD_CGROUP_CONTROLLER, path, pid);
+
+ NULSTR_FOREACH(n, mask_names) {
+ if (bit & mask)
+ cg_attach(n, path, pid);
+ else {
+ char prefix[strlen(path) + 1], *slash;
+
+ /* OK, this one is a bit harder... Now we need
+ * to add to the closest parent cgroup we
+ * can find */
+ strcpy(prefix, path);
+ while ((slash = strrchr(prefix, '/'))) {
+ int q;
+ *slash = 0;
+
+ q = cg_attach(n, prefix, pid);
+ if (q >= 0)
+ break;
+ }
+ }
+
+ bit <<= 1;
+ }
+
+ return r;
+}
+
+int cg_attach_many_with_mask(CGroupControllerMask mask, 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 k;
+
+ k = cg_attach_with_mask(mask, path, pid);
+ if (k < 0)
+ r = k;
+ }
+
+ return r;
+}
+
+int cg_migrate_with_mask(CGroupControllerMask mask, const char *from, const char *to) {
+ CGroupControllerMask bit = 1;
+ const char *n;
+ int r;
+
+ if (path_equal(from, to))
+ return 0;
+
+ r = cg_migrate_recursive(SYSTEMD_CGROUP_CONTROLLER, from, SYSTEMD_CGROUP_CONTROLLER, to, false, true);
+
+ NULSTR_FOREACH(n, mask_names) {
+ if (bit & mask)
+ cg_migrate_recursive(SYSTEMD_CGROUP_CONTROLLER, to, n, to, false, false);
+ else {
+ char prefix[strlen(to) + 1], *slash;
+
+ strcpy(prefix, to);
+ while ((slash = strrchr(prefix, '/'))) {
+ int q;
+
+ *slash = 0;
+
+ q = cg_migrate_recursive(SYSTEMD_CGROUP_CONTROLLER, to, n, prefix, false, false);
+ if (q >= 0)
+ break;
+ }
+ }
+
+ bit <<= 1;
+ }
+
+ return r;
+}
+
+int cg_trim_with_mask(CGroupControllerMask mask, 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 (bit & mask)
+ cg_trim(n, path, delete_root);
+
+ bit <<= 1;
+ }
+
+ return r;
+}
+
+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;
+}
~ianmdlvl / elogind.git / blobdiff