/*
* Escape to the root cgroup if we are root, so that the container will
* be in "/lxc/c1" rather than "/user/..../c1"
* called internally with connection already open
*/
static bool lxc_cgmanager_escape(void)
{
bool ret = true;
pid_t me = getpid();
char **slist = subsystems;
int i;
if (cgm_all_controllers_same)
slist = subsystems_inone;
for (i = 0; slist[i]; i++) {
if (cgmanager_move_pid_abs_sync(NULL, cgroup_manager,
slist[i], "/", me) != 0) {
NihError *nerr;
nerr = nih_error_get();
ERROR("call to cgmanager_move_pid_abs_sync(%s) failed: %s",
slist[i], nerr->message);
nih_free(nerr);
ret = false;
break;
}
}
return ret;
}
void cgm_escape(void)
{
if ( cgmanager_move_pid_abs_sync(NULL, cgroup_manager, ctrl_list, "/", (int32_t) getpid()) != 0) {
NihError *nerr;
nerr = nih_error_get();
fprintf(stderr, "warning: attempt to escape to root cgroup failed: %s\n", nerr->message);
nih_free(nerr);
}
}
bool cgm_escape_cgroup(void)
{
if (!cgm_dbus_connect()) {
return false;
}
if ( cgmanager_move_pid_abs_sync(NULL, cgroup_manager, "all", "/", (int32_t) getpid()) != 0 ) {
NihError *nerr;
nerr = nih_error_get();
fprintf(stderr, "call to move_pid_abs (all:/) failed: %s\n", nerr->message);
nih_free(nerr);
cgm_dbus_disconnect();
return false;
}
cgm_dbus_disconnect();
return true;
}
static bool lxc_cgmanager_escape(void)
{
pid_t me = getpid();
int i;
for (i = 0; i < nr_subsystems; i++) {
if (cgmanager_move_pid_abs_sync(NULL, cgroup_manager,
subsystems[i], "/", me) != 0) {
NihError *nerr;
nerr = nih_error_get();
ERROR("call to cgmanager_move_pid_abs_sync(%s) failed: %s",
subsystems[i], nerr->message);
nih_free(nerr);
return false;
}
}
return true;
}
/*
* Use the cgmanager to move a task into a cgroup for a particular
* hierarchy.
* All the subsystems in this hierarchy are co-mounted, so we only
* need to transition the task into one of the cgroups
*
* Internal helper, must be called with cgmanager dbus socket open
*/
static bool lxc_cgmanager_enter(pid_t pid, const char *controller,
const char *cgroup_path, bool abs)
{
int ret;
if (abs)
ret = cgmanager_move_pid_abs_sync(NULL, cgroup_manager,
controller, cgroup_path, pid);
else
ret = cgmanager_move_pid_sync(NULL, cgroup_manager,
controller, cgroup_path, pid);
if (ret != 0) {
NihError *nerr;
nerr = nih_error_get();
ERROR("call to cgmanager_move_pid_%ssync failed: %s",
abs ? "abs_" : "", nerr->message);
nih_free(nerr);
return false;
}
return true;
}
/*
* Escape to the root cgroup if we are root, so that the container will
* be in "/lxc/c1" rather than "/user/..../c1"
* called internally with connection already open
*/
static bool cgm_escape(void *hdata)
{
bool ret = true, cgm_needs_disconnect = false;
pid_t me = getpid();
char **slist = subsystems;
int i;
if (!cgroup_manager) {
if (!cgm_dbus_connect()) {
ERROR("Error connecting to cgroup manager");
return false;
}
cgm_needs_disconnect = true;
}
if (cgm_all_controllers_same)
slist = subsystems_inone;
for (i = 0; slist[i]; i++) {
if (cgmanager_move_pid_abs_sync(NULL, cgroup_manager,
slist[i], "/", me) != 0) {
NihError *nerr;
nerr = nih_error_get();
ERROR("call to cgmanager_move_pid_abs_sync(%s) failed: %s",
slist[i], nerr->message);
nih_free(nerr);
ret = false;
break;
}
}
if (cgm_needs_disconnect)
cgm_dbus_disconnect();
return ret;
}