Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ 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
- General Public License for more details.
+ Lesser General Public License for more details.
- You should have received a copy of the GNU General Public License
+ 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 "set.h"
#include "macro.h"
#include "util.h"
-#include "mkdir.h"
int cg_enumerate_processes(const char *controller, const char *path, FILE **_f) {
char *fs;
return ret;
}
+static const char *normalize_controller(const char *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;
+
+ if (path && suffix)
+ t = join("/sys/fs/cgroup/", controller, "/", path, "/", suffix, NULL);
+ else if (path)
+ t = join("/sys/fs/cgroup/", controller, "/", path, NULL);
+ else if (suffix)
+ t = join("/sys/fs/cgroup/", controller, "/", suffix, NULL);
+ else
+ t = join("/sys/fs/cgroup/", controller, NULL);
+
+ 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;
- char *t;
static __thread bool good = false;
assert(controller);
assert(fs);
+ if (isempty(controller))
+ return -EINVAL;
+
if (_unlikely_(!good)) {
int r;
good = true;
}
- if (isempty(controller))
- return -EINVAL;
+ p = normalize_controller(controller);
- /* This is a very minimal lookup from controller names to
- * paths. Since we have mounted most hierarchies ourselves
- * should be kinda safe, but eventually we might want to
- * extend this to have a fallback to actually check
- * /proc/mounts. Might need caching then. */
+ return join_path(p, path, suffix, fs);
+}
- if (streq(controller, SYSTEMD_CGROUP_CONTROLLER))
- p = "systemd";
- else if (startswith(controller, "name="))
- p = controller + 5;
- else
- p = controller;
+int cg_get_path_and_check(const char *controller, const char *path, const char *suffix, char **fs) {
+ const char *p;
+ char *cc;
- if (path && suffix)
- t = join("/sys/fs/cgroup/", p, "/", path, "/", suffix, NULL);
- else if (path)
- t = join("/sys/fs/cgroup/", p, "/", path, NULL);
- else if (suffix)
- t = join("/sys/fs/cgroup/", p, "/", suffix, NULL);
- else
- t = join("/sys/fs/cgroup/", p, NULL);
+ assert(controller);
+ assert(fs);
- if (!t)
- return -ENOMEM;
+ if (isempty(controller))
+ return -EINVAL;
- path_kill_slashes(t);
+ p = normalize_controller(controller);
- *fs = t;
- return 0;
+ /* 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 join_path(p, path, suffix, fs);
}
static int trim_cb(const char *path, const struct stat *sb, int typeflag, struct FTW *ftwbuf) {
return r == -ENOENT ? 0 : r;
}
-int cg_create(const char *controller, const char *path) {
- char *fs;
- int r;
-
- assert(controller);
- assert(path);
-
- if ((r = cg_get_path(controller, path, NULL, &fs)) < 0)
- return r;
-
- r = mkdir_parents(fs, 0755);
-
- if (r >= 0) {
- if (mkdir(fs, 0755) >= 0)
- r = 1;
- else if (errno == EEXIST)
- r = 0;
- else
- r = -errno;
- }
-
- free(fs);
-
- return r;
-}
-
int cg_attach(const char *controller, const char *path, pid_t pid) {
char *fs;
int r;
assert(path);
assert(pid >= 0);
- if ((r = cg_get_path(controller, path, "tasks", &fs)) < 0)
+ r = cg_get_path_and_check(controller, path, "tasks", &fs);
+ if (r < 0)
return r;
if (pid == 0)
return r;
}
-int cg_create_and_attach(const char *controller, const char *path, pid_t pid) {
- int r, q;
-
- assert(controller);
- assert(path);
- assert(pid >= 0);
-
- if ((r = cg_create(controller, path)) < 0)
- return r;
-
- if ((q = cg_attach(controller, path, pid)) < 0)
- return q;
-
- /* This does not remove the cgroup on failure */
-
- return r;
-}
-
int cg_set_group_access(const char *controller, const char *path, mode_t mode, uid_t uid, gid_t gid) {
char *fs;
int r;
~ianmdlvl / elogind.git / blobdiff