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/* " Copyright (C) 2009 Red Hat, Inc. All Rights Reserved.
* " Written by Ivana Hutarova Varekova <varekova@redhat.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2.1 of the GNU Lesser General Public License
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#include <libcgroup.h>
enum flag{
FL_MOUNT = 1,
FL_LIST = 2
};
typedef char cont_name_t[FILENAME_MAX];
void usage(int status, char *program_name)
{
if (status != 0) {
fprintf(stderr, "Wrong input parameters,"
" try %s -h' for more information.\n",
program_name);
} else {
fprintf(stdout, "Usage: %s [-m] [controller] [...]\n",
program_name);
fprintf(stdout, "list all sybsystems of given controller\n");
fprintf(stdout, " -h, --help Display this help\n");
fprintf(stdout, " -m, --mount-points Display mount points\n");
}
}
/* print data about input cont_name controller */
int print_controller(cont_name_t cont_name, int flags)
{
int ret = 0;
char name[FILENAME_MAX];
char path[FILENAME_MAX];
void *handle;
struct cgroup_mount_point controller;
int output = 0;
ret = cgroup_get_controller_begin(&handle, &controller);
path[0] = '\0';
name[0] = '\0';
/* go through the list of controllers */
while (ret == 0) {
if (strcmp(path, controller.path) == 0) {
/* if it is still the same mount point */
strncat(name, "," , FILENAME_MAX-strlen(name)-1);
strncat(name, controller.name,
FILENAME_MAX-strlen(name)-1);
} else {
/*
* we got new mount point
* print the old one if needed
*/
if (output) {
if ((flags & FL_MOUNT) != 0)
printf("%s %s\n", name, path);
else
printf("%s \n", name);
if ((flags & FL_LIST) != 0) {
/* we succesfully finish printing */
output = 0;
break;
}
}
output = 0;
strncpy(name, controller.name, FILENAME_MAX);
name[FILENAME_MAX-1] = '\0';
strncpy(path, controller.path, FILENAME_MAX);
path[FILENAME_MAX-1] = '\0';
}
/* set output flag */
if ((!output) && (!(flags & FL_LIST) ||
(strcmp(controller.name, cont_name) == 0)))
output = 1;
/* the actual controller should not be printed */
ret = cgroup_get_controller_next(&handle, &controller);
}
if (output) {
if ((flags & FL_MOUNT) != 0)
printf("%s %s\n", name, path);
else
printf("%s \n", name);
if ((flags & FL_LIST) != 0)
ret = 0;
}
cgroup_get_controller_end(&handle);
return ret;
}
/* list the controllers */
int cgroup_list_controllers(char *tname,
cont_name_t cont_name[CG_CONTROLLER_MAX], int flags)
{
int ret = 0;
int final_ret = 0;
int i = 0;
/* initialize libcgroup */
ret = cgroup_init();
if (ret) {
fprintf(stderr, "controllers can't be listed: %s\n",
cgroup_strerror(ret));
return ret;
}
if ((flags & FL_LIST) == 0) {
/* we have to print all controllers */
ret = print_controller(NULL, flags);
if (ret == ECGEOF)
final_ret = 0;
else
fprintf(stderr, "controllers can't be listed: %s\n",
cgroup_strerror(ret));
} else
/* we have he list of controllers which should be print */
while ((i < CG_CONTROLLER_MAX) && (cont_name[i][0] != '\0')
&& ((ret == ECGEOF) || (ret == 0))) {
ret = print_controller(cont_name[i], flags);
if (ret != 0) {
if (ret == ECGEOF)
/* controller was not found */
final_ret = ECGFAIL;
else
/* other problem */
final_ret = ret;
fprintf(stderr,
"%s: cannot find group %s: %s\n",
tname, cont_name[i],
cgroup_strerror(final_ret));
}
i++;
}
return final_ret;
}
int main(int argc, char *argv[])
{
int ret = 0;
int c;
int flags = 0;
int i;
int c_number = 0;
cont_name_t cont_name[CG_CONTROLLER_MAX];
static struct option options[] = {
{"help", 0, 0, 'h'},
{"mount-points", 0, 0, 'm'},
{0, 0, 0, 0}
};
for (i = 0; i < CG_CONTROLLER_MAX; i++)
cont_name[i][0] = '\0';
/* parse arguments */
while ((c = getopt_long(argc, argv, "mh", options, NULL)) > 0) {
switch (c) {
case 'h':
usage(0, argv[0]);
return 0;
case 'm':
flags |= FL_MOUNT;
break;
default:
usage(1, argv[0]);
return -1;
}
}
/* read the list of controllers */
while (optind < argc) {
flags |= FL_LIST;
strncpy(cont_name[c_number], argv[optind], FILENAME_MAX);
cont_name[c_number][FILENAME_MAX-1] = '\0';
c_number++;
optind++;
if (optind == CG_CONTROLLER_MAX) {
fprintf(stderr, "too much parameters\n");
break;
}
}
/*
* print the information
* based on list of input controllers and flags
*/
ret = cgroup_list_controllers(argv[0], cont_name, flags);
return ret;
}
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