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/*
* lxc: linux Container library
*
* (C) Copyright IBM Corp. 2007, 2008
*
* Authors:
* Daniel Lezcano <dlezcano at fr.ibm.com>
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef __lxc_h
#define __lxc_h
#ifdef __cplusplus
extern "C" {
#endif
/**
Following code is for liblxc.
liblxc/lxc.h will contain exports of liblxc
**/
#include <lxc/lxc_state.h>
#include <lxc/lxc_list.h>
#include <lxc/lxc_conf.h>
#include <lxc/lxc_log.h>
#include <lxc/lxc_lock.h>
#include <lxc/lxc_namespace.h>
#include <lxc/lxc_utils.h>
#include <lxc/cgroup.h>
#include <lxc/monitor.h>
#define LXCPATH "/var/lxc"
#define MAXPIDLEN 20
struct lxc_mem_stat;
typedef int (*lxc_callback_t)(const char *name, int argc,
char *argv[], void *data);
/*
* Create the container object. Creates the /lxc/<name> directory
* and fills it with the files corresponding to the configuration
* structure passed as parameter.
* The first container will create the /lxc directory.
* @name : the name of the container
* @conf : the configuration data for the container
* Returns 0 on success, < 0 otherwise
*/
extern int lxc_create(const char *name, struct lxc_conf *conf);
/*
* Destroy the container object. Removes the files into the /lxc/<name>
* directory and removes the <name> directory.
* The last container will remove the /lxc directory.
* @name : the name of the container to be detroyed
* Returns 0 on success, < 0 otherwise
*/
extern int lxc_destroy(const char *name);
/*
* Start the container previously created with lxc_create.
* @name : the name of the container
* @argc : the number of arguments of the command line
* @argv : an array of char * corresponding to the commande line
* @prestart : hooks will be called just before the command execs
* Returns 0 on sucess, < 0 otherwise
*/
extern int lxc_start(const char *name, int argc, char *argv[],
lxc_callback_t prestart, void *data);
/*
* Create the container and start it directly, using the argc, argv
* parameter. This command is for application container.
* At the end of the exec'ed command, the container will
* automatically autodestroy.
* @name : the name of the container
* @conf : the configuration data
* @argc : the number of arguments of the command line
* @argv : an array of char * corresponding to the commande line
* @preexec : hooks will be called just before the command execs
* Returns 0 on success, < 0 otherwise
*/
extern int lxc_execute(const char *name, int argc, char *argv[],
lxc_callback_t preexec, void *data);
/*
* Stop the container previously started with lxc_start or lxc_exec
* @name : the name of the container
* Returns 0 on success, < 0 otherwise
*/
extern int lxc_stop(const char *name);
/*
* Monitor the container, each time the state of the container
* is changed, a state data is send through a file descriptor passed to
* the function with output_fd.
* The function will block until the container is destroyed.
* @name : the name of the container
* @output_fd : the file descriptor where to send the states
* Returns 0 on success, < 0 otherwise
*/
extern int lxc_monitor(const char *name, int output_fd);
/*
* Open the monitoring mechanism for a specific container
* The function will return an fd corresponding to the events
* Returns a file descriptor on success, < 0 otherwise
*/
extern int lxc_monitor_open();
/*
* Read the state of the container if this one has changed
* The function will block until there is an event available
* @fd : the file descriptor provided by lxc_monitor_open
* @state : the variable which will be filled with the state
* Returns 0 if the monitored container has exited, > 0 if
* data was readen, < 0 otherwise
*/
extern int lxc_monitor_read(int fd, struct lxc_msg *msg);
/*
* Close the fd associated with the monitoring
* @fd : the file descriptor provided by lxc_monitor_open
* Returns 0 on success, < 0 otherwise
*/
extern int lxc_monitor_close(int fd);
/*
* Show the console of the container.
* @name : the name of container
* Returns 0 on sucess, < 0 otherwise
*/
extern int lxc_console(const char *name);
/*
* Freeze all the tasks running inside the container <name>
* @name : the container name
* Returns 0 on success, < 0 otherwise
*/
extern int lxc_freeze(const char *name);
/*
* Unfreeze all previously frozen tasks.
* @name : the name of the container
* Return 0 on sucess, < 0 otherwise
*/
extern int lxc_unfreeze(const char *name);
/*
* Retrieve the container state
* @name : the name of the container
* Returns the state of the container on success, < 0 otherwise
*/
extern lxc_state_t lxc_state(const char *name);
/*
* Send a signal to all processes of the container. This is the same
* behavior of the well-known 'killpg' command except it is related
* to all tasks belonging to a container.
* @name : the name of the container
* @signum : the signal number to be sent
* Returns 0 on success, < 0 otherwise
*/
extern int lxc_kill(const char *name, int signum);
/*
* Set a specified value for a specified subsystem. The specified
* subsystem must be fully specified, eg. "cpu.shares"
* @name : the name of the container
* @subsystem : the subsystem
* @value : the value to be set
* Returns 0 on success, < 0 otherwise
*/
extern int lxc_cgroup_set(const char *name, const char *subsystem, const char *value);
/*
* Get a specified value for a specified subsystem. The specified
* subsystem must be fully specified, eg. "cpu.shares"
* @name : the name of the container
* @subsystem : the subsystem
* @value : the value to be set
* @len : the len of the value variable
* Returns 0 on success, < 0 otherwise
*/
extern int lxc_cgroup_get(const char *name, const char *subsystem,
char *value, size_t len);
/*
* Checkpoint a container previously frozen
* @name : the name of the container being checkpointed
* @fd : file descriptor on which the container is checkpointed
* @flags : checkpoint flags
* Returns 0 on success, < 0 otherwise
*/
extern int lxc_checkpoint(const char *name, int fd, unsigned long flags);
/*
* Restart a container previously frozen
* @name : the name of the container being restarted
* @fd : file descriptor from which the container is restarted
* @flags : restart flags
* Returns 0 on success, < 0 otherwise
*/
extern int lxc_restart(const char *name, int fd, unsigned long flags);
/*
* Returns the version number of the library
*/
extern const char const *lxc_version(void);
#ifdef __cplusplus
}
#endif
#endif
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