static int whitelist_device(const char *path, const char *node, const char *acc) {
char buf[2+DECIMAL_STR_MAX(dev_t)*2+2+4];
struct stat st;
+ bool ignore_notfound;
int r;
assert(path);
assert(acc);
+ if (node[0] == '-') {
+ /* Non-existent paths starting with "-" must be silently ignored */
+ node++;
+ ignore_notfound = true;
+ } else
+ ignore_notfound = false;
+
if (stat(node, &st) < 0) {
- /* path starting with "-" must be silently ignored */
- if (errno == ENOENT && startswith(node, "-"))
+ if (errno == ENOENT && ignore_notfound)
return 0;
return log_warning_errno(errno, "Couldn't stat device %s: %m", node);
return 0;
fail:
- log_warning_errno(errno, "Failed to read /proc/devices: %m");
- return -errno;
+ return log_warning_errno(errno, "Failed to read /proc/devices: %m");
}
static bool cgroup_context_has_cpu_weight(CGroupContext *c) {
if ((mask & CGROUP_MASK_MEMORY) && !is_root) {
if (cg_all_unified() > 0) {
- uint64_t max;
- uint64_t swap_max = CGROUP_LIMIT_MAX;
+ uint64_t max, swap_max = CGROUP_LIMIT_MAX;
if (cgroup_context_has_unified_memory_config(c)) {
max = c->memory_max;
return 0;
/* Only applies to the unified hierarchy */
- r = cg_unified(SYSTEMD_CGROUP_CONTROLLER);
+ r = cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER);
if (r < 0)
- return log_unit_error_errno(u, r, "Failed detect whether the unified hierarchy is used: %m");
+ return log_error_errno(r, "Failed to determine whether the name=systemd hierarchy is unified: %m");
if (r == 0)
return 0;
}
int unit_watch_all_pids(Unit *u) {
+ int r;
+
assert(u);
/* Adds all PIDs from our cgroup to the set of PIDs we
if (!u->cgroup_path)
return -ENOENT;
- if (cg_unified(SYSTEMD_CGROUP_CONTROLLER) > 0) /* On unified we can use proper notifications */
+ r = cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER);
+ if (r < 0)
+ return r;
+ if (r > 0) /* On unified we can use proper notifications */
return 0;
return unit_watch_pids_in_path(u, u->cgroup_path);
int manager_setup_cgroup(Manager *m) {
_cleanup_free_ char *path = NULL;
CGroupController c;
- int r, all_unified, systemd_unified;
+ int r, all_unified;
char *e;
assert(m);
/* 1. Determine hierarchy */
m->cgroup_root = mfree(m->cgroup_root);
+#if 0 /// elogind is not init and must therefore search for PID 1 instead of self.
r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &m->cgroup_root);
+#else
+ r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 1, &m->cgroup_root);
+#endif // 0
if (r < 0)
return log_error_errno(r, "Cannot determine cgroup we are running in: %m");
if (r < 0)
return log_error_errno(r, "Cannot find cgroup mount point: %m");
- all_unified = cg_all_unified();
- systemd_unified = cg_unified(SYSTEMD_CGROUP_CONTROLLER);
-
- if (all_unified < 0 || systemd_unified < 0)
- return log_error_errno(all_unified < 0 ? all_unified : systemd_unified,
- "Couldn't determine if we are running in the unified hierarchy: %m");
+ r = cg_unified_flush();
+ if (r < 0)
+ return log_error_errno(r, "Couldn't determine if we are running in the unified hierarchy: %m");
- if (all_unified > 0)
+ all_unified = cg_all_unified();
+ if (r < 0)
+ return log_error_errno(r, "Couldn't determine whether we are in all unified mode: %m");
+ if (r > 0)
log_debug("Unified cgroup hierarchy is located at %s.", path);
- else if (systemd_unified > 0)
- log_debug("Unified cgroup hierarchy is located at %s. Controllers are on legacy hierarchies.", path);
- else
- log_debug("Using cgroup controller " SYSTEMD_CGROUP_CONTROLLER ". File system hierarchy is at %s.", path);
+ else {
+ r = cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER);
+ if (r < 0)
+ return log_error_errno(r, "Failed to determine whether systemd's own controller is in unified mode: %m");
+ if (r > 0)
+ log_debug("Unified cgroup hierarchy is located at %s. Controllers are on legacy hierarchies.", path);
+ else
+ log_debug("Using cgroup controller " SYSTEMD_CGROUP_CONTROLLER_LEGACY ". File system hierarchy is at %s.", path);
+ }
if (!m->test_run) {
const char *scope_path;
+#if 0 /// elogind is not init, and does not install the agent here.
/* 3. Install agent */
- if (systemd_unified) {
+ if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER) > 0) {
/* In the unified hierarchy we can get
* cgroup empty notifications via inotify. */
-#if 0 /// elogind does not support the unified hierarchy, yet.
m->cgroup_inotify_event_source = sd_event_source_unref(m->cgroup_inotify_event_source);
safe_close(m->cgroup_inotify_fd);
(void) sd_event_source_set_description(m->cgroup_inotify_event_source, "cgroup-inotify");
-#else
- return log_error_errno(EOPNOTSUPP, "Unified cgroup hierarchy not supported: %m");
-#endif // 0
} else if (MANAGER_IS_SYSTEM(m)) {
/* On the legacy hierarchy we only get
log_debug("Release agent already installed.");
}
-#if 0 /// elogind is not meant to run in systemd init scope
/* 4. Make sure we are in the special "init.scope" unit in the root slice. */
scope_path = strjoina(m->cgroup_root, "/" SPECIAL_INIT_SCOPE);
r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, scope_path, 0);
#else
- if (streq(SYSTEMD_CGROUP_CONTROLLER, "name=elogind"))
+ /* Note:
+ * This method is in core, and normally called by systemd
+ * being init. As elogind is never init, we can not install
+ * our agent here. We do so when mounting our cgroup file
+ * system, so only if elogind is its own tiny controller.
+ * Further, elogind is not meant to run in systemd init scope. */
+ if (MANAGER_IS_SYSTEM(m))
// we are our own cgroup controller
scope_path = strjoina("");
else if (streq(m->cgroup_root, "/elogind"))
return log_error_errno(r, "Failed to create %s control group: %m", scope_path);
log_debug_elogind("Created control group \"%s\"", scope_path);
+#if 0 /// elogind is not a "sub-controller" like systemd, so migration is not needed.
/* also, move all other userspace processes remaining
* in the root cgroup into that scope. */
r = cg_migrate(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, SYSTEMD_CGROUP_CONTROLLER, scope_path, 0);
if (r < 0)
log_warning_errno(r, "Couldn't move remaining userspace processes, ignoring: %m");
+#endif // 0
/* 5. And pin it, so that it cannot be unmounted */
safe_close(m->pin_cgroupfs_fd);
if ((u->cgroup_realized_mask & CGROUP_MASK_MEMORY) == 0)
return -ENODATA;
- if (cg_all_unified() <= 0)
- r = cg_get_attribute("memory", u->cgroup_path, "memory.usage_in_bytes", &v);
- else
+ r = cg_all_unified();
+ if (r < 0)
+ return r;
+ if (r > 0)
r = cg_get_attribute("memory", u->cgroup_path, "memory.current", &v);
+ else
+ r = cg_get_attribute("memory", u->cgroup_path, "memory.usage_in_bytes", &v);
if (r == -ENOENT)
return -ENODATA;
if (r < 0)
if (!u->cgroup_path)
return -ENODATA;
- if (cg_all_unified() > 0) {
+ r = cg_all_unified();
+ if (r < 0)
+ return r;
+ if (r > 0) {
const char *keys[] = { "usage_usec", NULL };
_cleanup_free_ char *val = NULL;
uint64_t us;
~ianmdlvl / elogind.git / blobdiff