#include "set.h"
#include "macro.h"
#include "util.h"
+#include "path-util.h"
+#include "strv.h"
+#include "unit-name.h"
+#include "fileio.h"
int cg_enumerate_processes(const char *controller, const char *path, FILE **_f) {
char *fs;
return 0;
}
-int cg_migrate(const char *controller, const char *from, const char *to, bool ignore_self) {
+int cg_migrate(const char *cfrom, const char *pfrom, const char *cto, const char *pto, bool ignore_self) {
bool done = false;
- Set *s;
+ _cleanup_set_free_ Set *s = NULL;
int r, ret = 0;
pid_t my_pid;
- FILE *f = NULL;
+ _cleanup_fclose_ FILE *f = NULL;
- assert(controller);
- assert(from);
- assert(to);
+ assert(cfrom);
+ assert(pfrom);
+ assert(cto);
+ assert(pto);
- if (!(s = set_new(trivial_hash_func, trivial_compare_func)))
+ s = set_new(trivial_hash_func, trivial_compare_func);
+ if (!s)
return -ENOMEM;
my_pid = getpid();
pid_t pid = 0;
done = true;
- if ((r = cg_enumerate_tasks(controller, from, &f)) < 0) {
+ r = cg_enumerate_tasks(cfrom, pfrom, &f);
+ if (r < 0) {
if (ret >= 0 && r != -ENOENT)
ret = r;
- goto finish;
+ return ret;
}
while ((r = cg_read_pid(f, &pid)) > 0) {
if (set_get(s, LONG_TO_PTR(pid)) == LONG_TO_PTR(pid))
continue;
- if ((r = cg_attach(controller, to, pid)) < 0) {
+ r = cg_attach(cto, pto, pid);
+ if (r < 0) {
if (ret >= 0 && r != -ESRCH)
ret = r;
} else if (ret == 0)
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;
- goto finish;
+ return ret;
}
}
if (ret >= 0)
ret = r;
- goto finish;
+ return ret;
}
fclose(f);
f = NULL;
-
} while (!done);
-finish:
- set_free(s);
-
- if (f)
- fclose(f);
-
return ret;
}
-int cg_migrate_recursive(const char *controller, const char *from, const char *to, bool ignore_self, bool rem) {
+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;
- DIR *d = NULL;
+ _cleanup_closedir_ DIR *d = NULL;
char *fn;
- assert(controller);
- assert(from);
- assert(to);
+ assert(cfrom);
+ assert(pfrom);
+ assert(cto);
+ assert(pto);
- ret = cg_migrate(controller, from, to, ignore_self);
+ ret = cg_migrate(cfrom, pfrom, cto, pto, ignore_self);
- if ((r = cg_enumerate_subgroups(controller, from, &d)) < 0) {
+ r = cg_enumerate_subgroups(cfrom, pfrom, &d);
+ if (r < 0) {
if (ret >= 0 && r != -ENOENT)
ret = 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", from, fn);
+ p = strjoin(pfrom, "/", fn, NULL);
free(fn);
-
- if (r < 0) {
+ if (!p) {
if (ret >= 0)
ret = -ENOMEM;
- goto finish;
+ return ret;
}
- r = cg_migrate_recursive(controller, p, to, ignore_self, rem);
- free(p);
-
+ 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)
- if ((r = cg_rmdir(controller, from, true)) < 0) {
- if (ret >= 0 &&
- r != -ENOENT &&
- r != -EBUSY)
- ret = r;
- }
-
-finish:
- if (d)
- closedir(d);
+ if (rem) {
+ r = cg_rmdir(cfrom, pfrom, true);
+ if (r < 0 && ret >= 0 && r != -ENOENT && r != -EBUSY)
+ return r;
+ }
return ret;
}
}
static int join_path(const char *controller, const char *path, const char *suffix, char **fs) {
- char *t;
+ char *t = NULL;
if (!(controller || path))
return -EINVAL;
if (controller) {
if (path && suffix)
- t = join("/sys/fs/cgroup/", controller, "/", path, "/", suffix, NULL);
+ t = strjoin("/sys/fs/cgroup/", controller, "/", path, "/", suffix, NULL);
else if (path)
- t = join("/sys/fs/cgroup/", controller, "/", path, NULL);
+ t = strjoin("/sys/fs/cgroup/", controller, "/", path, NULL);
else if (suffix)
- t = join("/sys/fs/cgroup/", controller, "/", suffix, NULL);
+ t = strjoin("/sys/fs/cgroup/", controller, "/", suffix, NULL);
else
- t = join("/sys/fs/cgroup/", controller, NULL);
+ t = strjoin("/sys/fs/cgroup/", controller, NULL);
} else {
if (path && suffix)
- t = join(path, "/", suffix, NULL);
+ t = strjoin(path, "/", suffix, NULL);
else if (path)
t = strdup(path);
}
return join_path(p, path, suffix, fs);
}
+static int check(const char *p) {
+ char *cc;
+
+ assert(p);
+
+ /* Check if this controller actually really exists */
+ cc = alloca(sizeof("/sys/fs/cgroup/") + strlen(p));
+ strcpy(stpcpy(cc, "/sys/fs/cgroup/"), p);
+ if (access(cc, F_OK) < 0)
+ return -errno;
+
+ return 0;
+}
+
int cg_get_path_and_check(const char *controller, const char *path, const char *suffix, char **fs) {
const char *p;
- char *cc;
+ int r;
assert(controller);
assert(fs);
if (isempty(controller))
return -EINVAL;
+ /* Normalize the controller syntax */
p = normalize_controller(controller);
/* Check if this controller actually really exists */
- cc = alloca(sizeof("/sys/fs/cgroup/") + strlen(p));
- strcpy(stpcpy(cc, "/sys/fs/cgroup/"), p);
- if (access(cc, F_OK) < 0)
- return -errno;
+ r = check(p);
+ if (r < 0)
+ return r;
return join_path(p, path, suffix, fs);
}
assert(controller);
assert(path);
- if ((r = parent_of_path(path, &parent)) < 0)
+ if ((r = path_get_parent(path, &parent)) < 0)
return r;
- r = cg_migrate_recursive(controller, path, parent, false, true);
+ 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);
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);
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,
+ int sticky) {
+
+ _cleanup_free_ char *fs = NULL, *procs = NULL;
int r;
assert(controller);
* mode from the file itself */
r = lstat(fs, &st);
- if (r < 0) {
- free(fs);
+ if (r < 0)
return -errno;
- }
if (mode == (mode_t) -1)
/* No mode set, we just shall set the sticky bit */
}
r = chmod_and_chown(fs, mode, uid, gid);
- free(fs);
+ if (r < 0)
+ return r;
- return r;
+ /* Always keep values for "cgroup.procs" in sync with "tasks" */
+ r = cg_get_path(controller, path, "cgroup.procs", &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) {
continue;
l++;
- if (strncmp(l, controller, cs) != 0)
+ if (!strneq(l, controller, cs))
continue;
if (l[cs] != ':')
goto finish;
}
- if ((r = write_one_line_file(fs, line)) < 0)
+ r = write_string_file(fs, line);
+ if (r < 0)
goto finish;
} else if (!streq(sc, agent)) {
sc = strstrip(contents);
if (streq(sc, "0")) {
- if ((r = write_one_line_file(fs, "1\n")) < 0)
+ if ((r = write_string_file(fs, "1\n")) < 0)
goto finish;
r = 1;
return !found;
}
+int cg_is_empty_by_spec(const char *spec, bool ignore_self) {
+ int r;
+ _cleanup_free_ char *controller = NULL, *path = NULL;
+
+ assert(spec);
+
+ r = cg_split_spec(spec, &controller, &path);
+ if (r < 0)
+ return r;
+
+ return cg_is_empty(controller, path, ignore_self);
+}
+
int cg_is_empty_recursive(const char *controller, const char *path, bool ignore_self) {
int r;
DIR *d = NULL;
char *t = NULL, *u = NULL;
assert(spec);
- assert(controller || path);
if (*spec == '/') {
+ if (!path_is_safe(spec))
+ return -EINVAL;
if (path) {
- if (!(t = strdup(spec)))
+ t = strdup(spec);
+ if (!t)
return -ENOMEM;
*path = t;
return 0;
}
- if (!(e = strchr(spec, ':'))) {
-
- if (strchr(spec, '/') || spec[0] == 0)
+ e = strchr(spec, ':');
+ if (!e) {
+ if (!filename_is_safe(spec))
return -EINVAL;
if (controller) {
- if (!(t = strdup(spec)))
+ t = strdup(spec);
+ if (!t)
return -ENOMEM;
*controller = t;
return 0;
}
- if (e[1] != '/' ||
- e == spec ||
- memchr(spec, '/', e-spec))
+ t = strndup(spec, e-spec);
+ if (!t)
+ return -ENOMEM;
+ if (!filename_is_safe(t)) {
+ free(t);
return -EINVAL;
+ }
- if (controller)
- if (!(t = strndup(spec, e-spec)))
- return -ENOMEM;
-
- if (path)
- if (!(u = strdup(e+1))) {
- free(t);
- return -ENOMEM;
- }
+ u = strdup(e+1);
+ if (!u) {
+ free(t);
+ return -ENOMEM;
+ }
+ if (!path_is_safe(u)) {
+ free(t);
+ free(u);
+ return -EINVAL;
+ }
if (controller)
*controller = t;
+ else
+ free(t);
if (path)
*path = u;
+ else
+ free(u);
return 0;
}
assert(result);
/* First check if it already is a filesystem path */
- if (path_is_absolute(path) &&
- path_startswith(path, "/sys/fs/cgroup") &&
+ if (path_startswith(path, "/sys/fs/cgroup") &&
access(path, F_OK) >= 0) {
- if (!(t = strdup(path)))
+ t = strdup(path);
+ if (!t)
return -ENOMEM;
*result = t;
}
/* Otherwise treat it as cg spec */
- if ((r = cg_split_spec(path, &c, &p)) < 0)
+ r = cg_split_spec(path, &c, &p);
+ if (r < 0)
return r;
r = cg_get_path(c ? c : SYSTEMD_CGROUP_CONTROLLER, p ? p : "/", NULL, result);
*path = p;
return 0;
}
+
+char **cg_shorten_controllers(char **controllers) {
+ char **f, **t;
+
+ controllers = strv_uniq(controllers);
+
+ if (!controllers)
+ return controllers;
+
+ for (f = controllers, t = controllers; *f; f++) {
+ int r;
+ const char *p;
+
+ if (streq(*f, "systemd") || streq(*f, SYSTEMD_CGROUP_CONTROLLER)) {
+ free(*f);
+ continue;
+ }
+
+ p = normalize_controller(*f);
+
+ r = check(p);
+ if (r < 0) {
+ log_debug("Controller %s is not available, removing from controllers list.", *f);
+ free(*f);
+ continue;
+ }
+
+ *(t++) = *f;
+ }
+
+ *t = NULL;
+ return controllers;
+}
+
+int cg_pid_get_cgroup(pid_t pid, char **root, char **cgroup) {
+ char *cg_process, *cg_init, *p;
+ int r;
+
+ assert(pid >= 0);
+
+ if (pid == 0)
+ pid = getpid();
+
+ r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &cg_process);
+ if (r < 0)
+ return r;
+
+ r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 1, &cg_init);
+ if (r < 0) {
+ free(cg_process);
+ return r;
+ }
+
+ if (endswith(cg_init, "/system"))
+ cg_init[strlen(cg_init)-7] = 0;
+ else if (streq(cg_init, "/"))
+ cg_init[0] = 0;
+
+ if (startswith(cg_process, cg_init))
+ p = cg_process + strlen(cg_init);
+ else
+ p = cg_process;
+
+ free(cg_init);
+
+ if (cgroup) {
+ char* c;
+
+ c = strdup(p);
+ if (!c) {
+ free(cg_process);
+ return -ENOMEM;
+ }
+
+ *cgroup = c;
+ }
+
+ if (root) {
+ cg_process[p-cg_process] = 0;
+ *root = cg_process;
+ } else
+ free(cg_process);
+
+ return 0;
+}
+
+static int instance_unit_from_cgroup(char *cgroup){
+ char *at;
+
+ assert(cgroup);
+
+ at = strstr(cgroup, "@.");
+ if (at) {
+ /* This is a templated service */
+
+ char *i;
+ char _cleanup_free_ *i2 = NULL, *s = NULL;
+
+ i = strchr(at, '/');
+ if (!i || !i[1]) /* disallow empty instances */
+ return -EINVAL;
+
+ s = strndup(at + 1, i - at - 1);
+ i2 = strdup(i + 1);
+ if (!s || !i2)
+ return -ENOMEM;
+
+ strcpy(at + 1, i2);
+ strcat(at + 1, s);
+ }
+
+ return 0;
+}
+
+/* non-static only for testing purposes */
+int cgroup_to_unit(char *cgroup, char **unit){
+ int r;
+ char *p;
+
+ assert(cgroup);
+ assert(unit);
+
+ r = instance_unit_from_cgroup(cgroup);
+ if (r < 0)
+ return r;
+
+ p = strrchr(cgroup, '/');
+ assert(p);
+
+ r = unit_name_is_valid(p + 1, true);
+ if (!r)
+ return -EINVAL;
+
+ *unit = strdup(p + 1);
+ if (!*unit)
+ return -ENOMEM;
+
+ return 0;
+}
+
+static int cg_pid_get(const char *prefix, pid_t pid, char **unit) {
+ int r;
+ char _cleanup_free_ *cgroup = NULL;
+
+ assert(pid >= 0);
+ assert(unit);
+
+ r = cg_pid_get_cgroup(pid, NULL, &cgroup);
+ if (r < 0)
+ return r;
+
+ if (!startswith(cgroup, prefix))
+ return -ENOENT;
+
+ r = cgroup_to_unit(cgroup, unit);
+ return r;
+}
+
+int cg_pid_get_unit(pid_t pid, char **unit) {
+ return cg_pid_get("/system/", pid, unit);
+}
+
+int cg_pid_get_user_unit(pid_t pid, char **unit) {
+ return cg_pid_get("/user/", pid, unit);
+}
+
+int cg_controller_from_attr(const char *attr, char **controller) {
+ const char *dot;
+ char *c;
+
+ assert(attr);
+ assert(controller);
+
+ if (!filename_is_safe(attr))
+ return -EINVAL;
+
+ dot = strchr(attr, '.');
+ if (!dot) {
+ *controller = NULL;
+ return 0;
+ }
+
+ c = strndup(attr, dot - attr);
+ if (!c)
+ return -ENOMEM;
+
+ if (!filename_is_safe(c)) {
+ free(c);
+ return -EINVAL;
+ }
+
+ *controller = c;
+ return 1;
+}
~ianmdlvl / elogind.git / blobdiff