/* display all controllers attached to the given hierarchy */
static int print_all_controllers_in_hierarchy(const char *tname,
int hierarchy, int flags)
{
int ret = 0;
void *handle;
struct controller_data info;
int first = 1;
cont_name_t cont_names;
cont_name_t cont_name;
/*
* Initialize libcgroup and intentionally ignore its result,
* no mounted controller is valid use case.
*/
(void) cgroup_init();
ret = cgroup_get_all_controller_begin(&handle, &info);
if ((ret != 0) && (ret != ECGEOF)) {
fprintf(stderr, "cannot read controller data: %s\n",
cgroup_strerror(ret));
return ret;
}
while (ret != ECGEOF) {
/* controller is in the hierrachy */
if (info.hierarchy != hierarchy)
goto next;
if (first) {
/* the first controller in the hierarchy */
memset(cont_name, 0, FILENAME_MAX);
strncpy(cont_name, info.name, FILENAME_MAX-1);
memset(cont_names, 0, FILENAME_MAX);
strncpy(cont_names, info.name, FILENAME_MAX-1);
first = 0;
} else {
/* the next controller in the hierarchy */
strncat(cont_names, ",", FILENAME_MAX-1);
strncat(cont_names, info.name, FILENAME_MAX-1);
}
next:
ret = cgroup_get_all_controller_next(&handle, &info);
if (ret && ret != ECGEOF)
goto end;
}
ret = print_controller_mount(cont_name,
flags, cont_names, hierarchy);
end:
cgroup_get_all_controller_end(&handle);
if (ret == ECGEOF)
ret = 0;
return ret;
}
/*
* Skip adding controller which points to the same cgroup when delete
* cgroup with specifying multi controllers. Just skip controller which
* cgroup and hierarchy number is same
*/
static int skip_add_controller(int counter, int *skip,
struct ext_cgroup_record *ecg_list)
{
int k;
struct controller_data info;
void *handle;
int ret = 0;
/* find out hierarchy number of added cgroup */
ecg_list[counter].h_number = 0;
ret = cgroup_get_all_controller_begin(&handle, &info);
while (ret == 0) {
if (!strcmp(info.name, ecg_list[counter].name)) {
/* hierarchy number found out, set it */
ecg_list[counter].h_number = info.hierarchy;
break;
}
ret = cgroup_get_all_controller_next(&handle, &info);
}
cgroup_get_all_controller_end(&handle);
/* deal with cgroup_get_controller_begin/next ret values */
if (ret == ECGEOF)
ret = 0;
if (ret) {
fprintf(stderr, "cgroup_get_controller_begin/next failed(%s)\n",
cgroup_strerror(ret));
return ret;
}
/* found out whether the hierarchy should be skipped */
*skip = 0;
for (k = 0; k < counter; k++) {
if ((!strcmp(ecg_list[k].name, ecg_list[counter].name)) &&
(ecg_list[k].h_number == ecg_list[counter].h_number)) {
/* we found a control group in the same hierarchy */
if (strcmp(ecg_list[k].controller,
ecg_list[counter].controller)) {
/*
* it is a different controller ->
* if there is not one cgroup for the same
* controller, skip it
*/
*skip = 1;
} else {
/*
* there is the identical group,controller pair
* don't skip it
*/
*skip = 0;
return ret;
}
}
}
return ret;
}
/* go through the list of all controllers gather them based on hierarchy number
and print them */
static int cgroup_list_all_controllers(const char *tname,
cont_name_t cont_name[CG_CONTROLLER_MAX], int c_number, int flags)
{
int ret = 0;
void *handle;
struct controller_data info;
int h_list[CG_CONTROLLER_MAX]; /* list of hierarchies */
int counter = 0;
int j;
int is_on_list = 0;
ret = cgroup_get_all_controller_begin(&handle, &info);
while (ret == 0) {
if (info.hierarchy == 0) {
/* the controller is not attached to any hierrachy */
if (flags & FL_ALL)
/* display only if -a flag is set */
printf("%s\n", info.name);
}
is_on_list = 0;
j = 0;
while ((is_on_list == 0) && (j < c_number)) {
if (strcmp(info.name, cont_name[j]) == 0) {
is_on_list = 1;
break;
}
j++;
}
if ((info.hierarchy != 0) &&
((flags & FL_ALL) ||
(!(flags & FL_LIST) || (is_on_list == 1)))) {
/* the controller is attached to some hierarchy
and either should be output all controllers,
or the controller is on the output list */
h_list[counter] = info.hierarchy;
counter++;
for (j = 0; j < counter-1; j++) {
/*
* the hierarchy already was on the list
* so remove the new record
*/
if (h_list[j] == info.hierarchy) {
counter--;
break;
}
}
}
ret = cgroup_get_all_controller_next(&handle, &info);
}
cgroup_get_all_controller_end(&handle);
if (ret == ECGEOF)
ret = 0;
if (ret) {
fprintf(stderr,
"cgroup_get_controller_begin/next failed (%s)\n",
cgroup_strerror(ret));
return ret;
}
for (j = 0; j < counter; j++)
ret = print_all_controllers_in_hierarchy(tname,
h_list[j], flags);
return ret;
}