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 "path-util.h"
+#include "strv.h"
int cg_enumerate_processes(const char *controller, const char *path, FILE **_f) {
char *fs;
int r;
FILE *f;
- assert(controller);
assert(path);
assert(_f);
- if ((r = cg_get_path(controller, path, "cgroup.procs", &fs)) < 0)
+ r = cg_get_path(controller, path, "cgroup.procs", &fs);
+ if (r < 0)
return r;
f = fopen(fs, "re");
int r;
FILE *f;
- assert(controller);
assert(path);
assert(_f);
- if ((r = cg_get_path(controller, path, "tasks", &fs)) < 0)
+ r = cg_get_path(controller, path, "tasks", &fs);
+ if (r < 0)
return r;
f = fopen(fs, "re");
int r;
DIR *d;
- assert(controller);
assert(path);
assert(_d);
/* This is not recursive! */
- if ((r = cg_get_path(controller, path, NULL, &fs)) < 0)
+ r = cg_get_path(controller, path, NULL, &fs);
+ if (r < 0)
return r;
d = opendir(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 = NULL;
+
+ if (!(controller || path))
+ return -EINVAL;
+
+ if (controller) {
+ 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);
+ } else {
+ if (path && suffix)
+ t = join(path, "/", suffix, NULL);
+ else if (path)
+ t = strdup(path);
+ }
+
+ 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 (_unlikely_(!good)) {
good = true;
}
- if (isempty(controller))
- return -EINVAL;
-
- /* 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. */
+ p = controller ? normalize_controller(controller) : NULL;
+ 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;
-
- 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);
+static int check(const char *p) {
+ char *cc;
- if (!t)
- return -ENOMEM;
+ assert(p);
- path_kill_slashes(t);
+ /* 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;
- *fs = t;
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(controller);
+ assert(fs);
+
+ if (isempty(controller))
+ return -EINVAL;
+
+ /* Normalize the controller syntax */
+ p = normalize_controller(controller);
+
+ /* Check if this controller actually really exists */
+ r = check(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) {
char *p;
bool is_sticky;
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);
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)
}
int cg_is_empty(const char *controller, const char *path, bool ignore_self) {
- pid_t pid = 0;
+ pid_t pid = 0, self_pid;
int r;
FILE *f = NULL;
bool found = false;
- assert(controller);
assert(path);
- if ((r = cg_enumerate_tasks(controller, path, &f)) < 0)
+ r = cg_enumerate_tasks(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 == getpid())
+ if (ignore_self && pid == self_pid)
continue;
found = true;
DIR *d = NULL;
char *fn;
- assert(controller);
assert(path);
- if ((r = cg_is_empty(controller, path, ignore_self)) <= 0)
+ r = cg_is_empty(controller, path, ignore_self);
+ if (r <= 0)
return r;
- if ((r = cg_enumerate_subgroups(controller, path, &d)) < 0)
+ r = cg_enumerate_subgroups(controller, path, &d);
+ if (r < 0)
return r == -ENOENT ? 1 : r;
while ((r = cg_read_subgroup(d, &fn)) > 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;
+}
+
+int cg_pid_get_unit(pid_t pid, char **unit) {
+ int r;
+ char *cgroup, *p, *at, *b;
+ size_t k;
+
+ assert(pid >= 0);
+ assert(unit);
+
+ r = cg_pid_get_cgroup(pid, NULL, &cgroup);
+ if (r < 0)
+ return r;
+
+ if (!startswith(cgroup, "/system/")) {
+ free(cgroup);
+ return -ENOENT;
+ }
+
+ p = cgroup + 8;
+ k = strcspn(p, "/");
+
+ at = memchr(p, '@', k);
+ if (at && at[1] == '.') {
+ size_t j;
+
+ /* This is a templated service */
+ if (p[k] != '/') {
+ free(cgroup);
+ return -EIO;
+ }
+
+ j = strcspn(p+k+1, "/");
+
+ b = malloc(k + j + 1);
+
+ if (b) {
+ memcpy(b, p, at - p + 1);
+ memcpy(b + (at - p) + 1, p + k + 1, j);
+ memcpy(b + (at - p) + 1 + j, at + 1, k - (at - p) - 1);
+ b[k+j] = 0;
+ }
+ } else
+ b = strndup(p, k);
+
+ free(cgroup);
+
+ if (!b)
+ return -ENOMEM;
+
+ *unit = b;
+ return 0;
+
+}
~ianmdlvl / elogind.git / blobdiff