lxc_cgroup.c revision 250b1eec71b074acdff1c5f6b5a1f0d7d2c20b77
/*
* lxc: linux Container library
*
* (C) Copyright IBM Corp. 2007, 2008
*
* Authors:
* Daniel Lezcano <daniel.lezcano at free.fr>
*
* This library is free software; you can redistribute it and/or
* modify it 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.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <unistd.h>
#include <libgen.h>
#include <sys/types.h>
#include <lxc/lxc.h>
#include <lxc/log.h>
#include <lxc/lxccontainer.h>
#include "arguments.h"
lxc_log_define(lxc_cgroup_ui, lxc_cgroup);
static int my_checker(const struct lxc_arguments* args)
{
if (!args->argc) {
lxc_error(args, "missing state object");
return -1;
}
return 0;
}
static const struct option my_longopts[] = {
LXC_COMMON_OPTIONS
};
static struct lxc_arguments my_args = {
.progname = "lxc-cgroup",
.help = "\
--name=NAME state-object [value]\n\
\n\
Get or set the value of a state object (for example, 'cpuset.cpus')\n\
in the container's cgroup for the corresponding subsystem.\n\
\n\
Options :\n\
-n, --name=NAME container name",
.options = my_longopts,
.parser = NULL,
.checker = my_checker,
};
int main(int argc, char *argv[])
{
char *state_object = NULL, *value = NULL;
struct lxc_container *c;
if (lxc_arguments_parse(&my_args, argc, argv))
return -1;
if (lxc_log_init(my_args.name, my_args.log_file, my_args.log_priority,
my_args.progname, my_args.quiet, my_args.lxcpath[0]))
return -1;
state_object = my_args.argv[0];
c = lxc_container_new(my_args.name, my_args.lxcpath[0]);
if (!c)
return -1;
if (!c->is_running(c)) {
ERROR("'%s:%s' is not running", my_args.lxcpath[0], my_args.name);
lxc_container_put(c);
return -1;
}
if ((my_args.argc) > 1) {
value = my_args.argv[1];
if (!c->set_cgroup_item(c, state_object, value)) {
ERROR("failed to assign '%s' value to '%s' for '%s'",
value, state_object, my_args.name);
lxc_container_put(c);
return -1;
}
} else {
int len = 4096;
char buffer[len];
int ret = c->get_cgroup_item(c, state_object, buffer, len);
if (ret < 0) {
ERROR("failed to retrieve value of '%s' for '%s:%s'",
state_object, my_args.lxcpath[0], my_args.name);
lxc_container_put(c);
return -1;
}
printf("%*s", ret, buffer);
}
lxc_container_put(c);
return 0;
}